U.S. patent application number 15/104286 was filed with the patent office on 2016-11-10 for device and process for inductively suppressing acid mist from electrowinning.
This patent application is currently assigned to Hangzhou Sanal Environmental Technology Co., LTD.. The applicant listed for this patent is HANGZHOU SANAL ENVIRONMENTAL TECHNOLOGY CO., LTD.. Invention is credited to Jianping Lin, Cheng Luo, Xiangfeng Shen, Wentang Shi.
Application Number | 20160326662 15/104286 |
Document ID | / |
Family ID | 56090964 |
Filed Date | 2016-11-10 |
United States Patent
Application |
20160326662 |
Kind Code |
A1 |
Lin; Jianping ; et
al. |
November 10, 2016 |
DEVICE AND PROCESS FOR INDUCTIVELY SUPPRESSING ACID MIST FROM
ELECTROWINNING
Abstract
The present invention discloses a device for inductively
suppressing acid mist from electrowinning. The device comprises a
polar plate. A first isolation net and a second isolation net are
respectively provided at two sides of the polar plate. Gaps are
left between the first and second isolation nets and the two sides
of the polar plate respectively. A first isolation piece and a
second isolation piece are respectively provided to two sides of a
top of the polar plate and are respectively located above the first
and second isolation nets. The present invention also discloses a
process for inductively suppressing acid mist from electrowinning
by using the above device. The acid mist suppressing device and
process of the present invention can prevent formation of acid mist
during an electrowinning process so that pollution of acid mist can
be eliminated and clean production can be realized.
Inventors: |
Lin; Jianping; (Zhejiang,
CN) ; Shi; Wentang; (Zhejiang, CN) ; Shen;
Xiangfeng; (Zhejiang, CN) ; Luo; Cheng;
(Zhejiang, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
HANGZHOU SANAL ENVIRONMENTAL TECHNOLOGY CO., LTD. |
Hanzhou City |
|
CN |
|
|
Assignee: |
Hangzhou Sanal Environmental
Technology Co., LTD.
Zhejiang
CN
|
Family ID: |
56090964 |
Appl. No.: |
15/104286 |
Filed: |
September 14, 2015 |
PCT Filed: |
September 14, 2015 |
PCT NO: |
PCT/CN2015/089547 |
371 Date: |
June 14, 2016 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
C25D 17/10 20130101;
C25C 1/16 20130101; C25C 1/12 20130101; C25C 1/10 20130101; C25C
7/06 20130101; C25D 21/04 20130101; C25C 1/08 20130101; C25C 7/04
20130101 |
International
Class: |
C25C 7/04 20060101
C25C007/04; C25C 1/10 20060101 C25C001/10; C25C 1/08 20060101
C25C001/08; C25C 1/12 20060101 C25C001/12; C25C 1/16 20060101
C25C001/16 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 4, 2014 |
CN |
201410725967.6 |
Claims
1. A device for inductively suppressing acid mist from
electrowinning comprising: a polar plate (1), a first isolation net
(3) and a second isolation net (4) being respectively provided at
two sides of the polar plate (1) with gaps being provided between
the first and second isolation nets (3, 4) and the two sides of the
polar plate (1) respectively; a first isolation piece (5) and a
second isolation piece (6) being respectively provided at two sides
of a top of the polar plate (1) and being respectively located
above the first and second isolation nets (3, 4).
2. The device of claim 1, wherein it further comprises: an acid
mist frame plate group including an outer frame (7), an inner frame
(8) and a diaphragm cloth (9), the diaphragm cloth (9) being
embedded in the outer frame (7) via the inner frame (8); the polar
plate (1), together with the first and second isolation nets (3, 4)
and the first and second isolation pieces (5, 6), being inserted
into the inner frame (8); and the first and second isolation pieces
(5, 6) being connected to the diaphragm cloth (9) respectively.
3. The device of claim 1, wherein the first isolation net (3) and
the polar plate (1) are connected by a first insulating connecting
member (10), and the second isolation net (4) and the polar plate
(1) are connected by a second insulating connecting member
(11).
4. The device of claim 1, wherein the first and second isolation
pieces (5, 6) are respectively connected to the two sides of the
top of the polar plate (1) by a fixing assembly.
5. The device of claim 4, wherein the fixing assembly comprises a
buckle (12), a first insulating loop bar (13) and a second
insulating loop bar (14), the first and second insulating loop bars
(13, 14) extending at two sides of the buckle (12) respectively;
the first isolation piece (5) being clipped between the first
insulating loop bar (13) and a side of the polar plate (1) and the
second isolation piece (6) being clipped between the second
insulating loop bar (14) and another side of the polar plate
(1).
6. The device of claim 5, wherein the first insulating loop bar
(13) and/or the second insulating loop bar (14) is/are sleeved by a
loop bar fixing sleeve (15).
7. The device of claim 2, wherein both ends of a top of the outer
frame (7) are connected to a conductive bar (1.1) at the top of the
polar plate (1) by a hanging buckle (2).
8. The device of claim 7, wherein the hanging buckle (2) comprises
a hanging member (2.1) with a triangular section, a first buckle
plate (2.2) and a second buckle plate (2.3) at two sides of a
bottom of the hanging member (2.1) respectively, inner sides of the
first buckle plate (2.2) and the second buckle plate (2.3) being
provided with a fastener (2.4) respectively; the fastener (2.4)
cooperating with a fastener installation hole (7.1) at the top of
the outer frame (7); and the conductive bar (1.1) of the polar
plate (1) being inserted in a hollow chamber of the hanging member
(2.1).
9. A process for inductively suppressing acid mist from
electrowinning by using the device according to claim 1, comprising
steps of: providing the first and second isolation nets at two
sides of an anode plate respectively and leaving gaps between the
first and second isolation nets and the two sides of the anode
plate respectively; connecting the first isolation net to a side of
the anode plate by the first insulating connecting member and
connecting the second isolation net to another side of the anode
plate by the second insulating connecting member; providing the
first and second isolation pieces at two sides of the top of the
anode plate respectively such that the first and second isolation
pieces are respectively located above the first and second
isolation nets, thereby forming the device for inductively
suppressing acid mist from electrowinning; arranging the device for
inductively suppressing acid mist from electrowinning and a cathode
plate in an electrowinning cell with a spacing therebetween, the
spacing between adjacent the devices for inductively suppressing
acid mist from electrowinning being 50-150 mm; and after arranging
the device for inductively suppressing acid mist from
electrowinning and the cathode plate in the electrowinning cell,
bubbles being generated from the anode plate and flowing in a
bottom-to-top direction between the first and second isolation
nets; when the bubbles reach a liquid surface of an electrowinning
liquid, acid mist in the bubbles being blocked by the first and
second isolation pieces while gas in the bubbles overflowing
through the first and second isolation pieces.
10. The process of claim 9, wherein after providing the first and
second isolation pieces at two sides of the top of the anode plate
respectively such that the first and second isolation pieces are
respectively located above the first and second isolation nets, the
process further comprises steps of: selecting the diaphragm cloth,
the inner frame and the outer frame as required, and embedding the
selected diaphragm cloth into the outer frame via the inner frame;
inserting the anode plate, together with the first and second
isolation nets and the first and second isolation pieces, into the
inner frame, and connecting the first and second isolation pieces
to the diaphragm cloth; and the gap between the first isolation net
and a side of the anode plate is 2-50 mm, and the gap between the
second isolation net and another side of the anode plate is 2-50
mm.
Description
TECHNICAL FIELD
[0001] The present invention relates to fields of hydrometallurgy,
electroplating and chemical engineering, and particularly to a
device and process for inductively suppressing acid mist from
electrowinning.
BACKGROUND ART
[0002] At present, during production in the fields of
hydrometallurgy, electroplating and chemical engineering, a plenty
of gas is generated due to electrochemical reactions at the cathode
and anode. When the gas precipitates from the polar plates, it
adheres to the surface of the electrodes in the primary stage. As
bubbles grow such that buoyance of the bubbles is greater than the
adhering force, the bubbles are released from the polar plates and
flow upwards from the solution. When the bubbles reach surface of
the liquid, they will certainly carry liquid due to liquid surface
tension. When the bubbles carrying the liquid encounter cold air at
the cell surface, they burst to form mist. As the solution is
acidic, a plenty of acid mist is formed above the cell surface,
which damages health of operation personnel, pollutes operation
sites and the environments. This also corrodes factories and
equipment, and increases the consumption of reagents.
[0003] To solve the problem of acid mist pollution at low altitude,
most manufacturers adopt mechanical air discharge. That is, after
acid mist is formed, large power blowers supply air to the factory
to substantially increase ventilation in the factory and decrease
the acid mist concentration. Or, gas collecting covers are mounted
above solution storage cells to collect acid mist above the cell
surface and the acid mist is pumped by blowers to absorption towers
for absorption by alkali liquor to reduce acid mist pollution. Both
the above methods are all post-treatment processes with complex
operations, high processing cost and low efficiency. In addition,
some manufacturers treat acid mist using cell surface covering
methods. Specifically, in one of the methods, the solution surface
in the cell is covered by plastics or foam balls to increase the
resistance when bubbles overflow such that the bubbles burst at the
surfaces of the foam balls. In this manner, acid-containing liquid
drops are adhered to the surfaces of the foam balls thereby
preventing discharge of acid-containing liquid drops and
effectively reducing formation of acid mist. In another method, a
surfactant is added to the liquid in the cell and a foam layer is
formed on the liquid surface, such that the foam layer can
effectively prevent diffusion of acid mist liquid drops when
bubbles overflow. However, this method has a problem that the foam
balls can be easily stuck to the polar plate and pipes can be
easily blocked. Therefore, the acid mist prevention effect is not
desirable. In addition, its operations are complex and costly. At
present, many manufacturers treat acid mist pollution by adding
acid mist suppression agents into the solution to reduce the
viscosity of the solution such that bubbles can overflow quickly
with less liquid drops carried. Acid mist pollution can thus be
reduced. The problems of this method include high production cost
and unstable suppression efficiency due to failure of the
suppression agents. In addition, some additives will affect the
product quality.
[0004] To root out the problem of acid mist pollution, the Chinese
patent application CN200710009588.7 adopts a method of wrapping the
anode by a plastic grid and an isolation cloth. By using this
method, the ascending path of the gas generated at the anode is
extended such that the bubbles grow bigger and fewer bubbles will
burst on the liquid surface and thereby suppress acid mist
pollution. Although this method can prevent formation of acid mist,
as the anode is completely wrapped by the isolation cloth, flowing
of the electrolysis liquid is hindered such that the voltage in the
cell increases and power consumption increases. In addition,
because the anode is completely wrapped by the isolation cloth,
plenty of gas gathers around the conductive beam of the anode such
that the corrosion rate of the conductive beam of the anode is
increased and thereby shortening the service life of the anode.
Therefore, it is necessary to develop a new device and process
which can not only prevent formation of acid mist but also
eliminate acid mist pollution and prevents increase of the voltage
in the cell.
SUMMARY OF THE INVENTION
[0005] To solve the technical problem of the prior arts in which
acid mist pollution can easily occur during an electrochemical
reaction process in the fields of hydrometallurgy, electroplating
and chemical engineering, the present invention provides a device
for inductively suppressing acid mist from electrowinning. With
this device, it can prevent formation of acid mist during an
electrodeposition process, eliminate acid mist pollution and
realize clean production.
[0006] The technical solutions of the present invention used for
solving the above technical problems are as below:
[0007] A device for inductively suppressing acid mist from
electrowinning is provided which comprises a polar plate with a
first isolation net and a second isolation net being respectively
provided at two sides of the polar plate. The first and second
isolation net is respectively placed with a gap to the
corresponding side of the polar plate. A first isolation piece and
a second isolation piece are respectively placed at two sides of a
top of the polar plate and the first isolation piece and the second
isolation piece are located above the first and second isolation
nets, respectively.
[0008] In electrowinning process of an electrochemical reaction, a
plenty of gas will be generated from the polar plate. When the gas
is generated from the polar plate, it adheres to the surface of the
electrode in the primary stage. As bubbles grow such that the
buoyance of the bubbles is greater than the adhering force, the
bubbles are released from the polar plate and flow upwards from the
electrowinning liquid. Because the first and second isolation nets
are provided at two sides of the polar plate respectively and the
gaps are provided between the first and second isolation nets and
the two sides of the polar plate respectively, the electrowinning
liquid can enter from bottoms of the first and second isolation
nets and the bubbles flow in a bottom-to-top direction along with
the electrowinning liquid between the first and second isolation
nets. In this process, the electrowinning liquid gradually flows
out. Due to presence of the first and second isolation nets, on one
hand, the resistance to the bubbles to ascend increases such that
the retaining time of the bubbles in the electrowinning liquid is
extended. Most bubbles burst in the electrowinning liquid or flow
out along the circulation of the electrowinning liquid so that the
number of bubbles bursting on the liquid surface can be
substantially reduced. On the other hand, for small bubbles
gathering continuously to form big ones in the electrowinning
liquid, Because the retaining time of the bubbles in the
electrowinning liquid is extended by the first and second isolation
nets, the number of bubbles bursting on the liquid surface is also
substantially reduced which in turn reduces or suppresses
generation of acid mist. In addition, as the gaps are respectively
provided between the first and second isolation nets and the two
sides of the polar plate, circulation of the solvent is facilitated
and gas can be induced to ascend. Driven by the ascending force,
the bubbles accelerate the migration rate of solvent ions in the
electrochemical reaction cell so that decrease of polarized
concentration difference and the voltage of the cell can be
facilitated.
[0009] The first isolation piece and second isolation piece are
respectively placed at two sides of the top of the polar plate and
are respectively located above the first and second isolation nets.
By applying such a design, gas in the bubbles can be inductively
discharged from the first and second isolation pieces such that the
overflow amount of acid-containing liquid drops can be reduced.
Further, a small amount of acid-containing liquid drops overflowing
from the solution is filtered by the first and second isolation
pieces and substantially blocked on the later. This can prevent
formation of acid mist on the surface of a cell during an
electrowinning process, eliminate acid mist pollution and help to
realize clean production. In addition, while gas can be inductively
discharged by the first and second isolation pieces, a phenomenon
of "swelling bag" due to presence of the first and second isolation
pieces on the polar plate can be prevented. In this manner,
sticking between polar plates and bursting of gas on the gas-liquid
interface can be avoided. Interface corrosion of the polar plate
can also be alleviated effectively.
[0010] As an improvement by the technical solution of this
invention, the device further comprises an acid mist frame plate
group including an outer frame, an inner frame and a diaphragm
cloth. The diaphragm cloth is embedded in the outer frame via the
inner frame. The polar plate, together with the first and second
isolation nets and the first and second isolation pieces, is
inserted into the inner frame. And the first and second isolation
pieces are connected to the diaphragm cloth respectively.
[0011] By embedding the diaphragm cloth in the outer frame via the
inner frame, expansion of the diaphragm cloth due to gas generated
on the polar plate can be avoided. In addition, by inserting the
polar plate in the inner frame together with the first and second
isolation nets and the first and second isolation pieces, effective
space can be formed between the polar plate and the acid mist frame
plate group. This can facilitate flow of the electrowinning liquid
and discharge of the gas generated on the polar plate and thus
avoids acid mist on the cell surface.
[0012] With the first and second isolation pieces being connected
to the diaphragm cloth respectively, overflow of acid mist can be
avoided effectively.
[0013] As an improvement by the technical solution of this
invention, the first isolation net and the polar plate are
connected by a first insulating connecting member. By connecting
the first isolation net and the polar plate via the first
insulating connecting member, the polar plate can be prevented from
projecting from top of the first isolation net due to increased
buoyance. On the other hand, bursting of gas on the gas-liquid
interface can be avoided, interface corrosion of the polar plate
can be alleviated effectively, and corrosion of the conductive bar
of the polar plate can be avoided. Thus, service life of the polar
plate can be extended.
[0014] As an improvement by the technical solution of this
invention, the second isolation net and the polar plate are
connected by a second insulating connecting member. Similar to the
above, by connecting the second isolation net and the polar plate
via the second insulating connecting member, gas can be prevented
from flowing from a side of the second isolation net due to
increased buoyance. On the other hand, bursting of gas on the
gas-liquid interface can be avoided, interface corrosion of the
polar plate can be alleviated effectively, and corrosion of the
conductive bar of the polar plate can be avoided, thereby extending
the service life of the polar plate.
[0015] As a further improvement by the technical solution of this
invention, the first and second isolation pieces are connected to
the two sides of the top of the polar plate by a fixing assembly
respectively. By providing the fixing assemblies, installation of
the first and second isolation pieces and the polar plate can be
facilitated.
[0016] As another improvement by the technical solution of this
invention, the fixing assembly comprises a buckle, a first
insulating loop bar and a second insulating loop bar. The first and
second insulating loop bars pass two sides of the buckle
respectively.
[0017] The first isolation piece is clipped between the first
insulating loop bar and a side of the polar plate and the second
isolation piece is clipped between the second insulating loop bar
and a side of the polar plate.
[0018] In the above fixing assembly, the buckle is mainly used to
fix the first and second insulating loop bars. The first and second
insulating loop bars are used to clip the first and second
isolation pieces respectively.
[0019] As an improvement by the technical solution of this
invention, the first insulating loop bar and/or the second
insulating loop bar is/are sleeved with a loop bar fixing sleeve.
The loop bar fixing sleeve can not only protect the first
insulating loop bar and/or the second insulating loop bar but also
help to increase frictional force between the first insulating loop
bar and the first isolation piece or frictional force between the
second insulating loop bar and the second isolation piece. In this
manner, clipping between the first or second insulating loop bar
and the first or second isolation piece can be enhanced.
[0020] As an improvement by the technical solution of this
invention, both ends of the top of the outer frame are connected to
a conductive bar at the top of the polar plate by a hanging buckle
respectively. The buckle can fix the diaphragm cloth such that a
certain distance between the diaphragm cloth and the polar plate
can be maintained and sticking therebetween can be avoided. At the
same time, the buckle can facilitate installation of the above acid
mist frame plate group.
[0021] As yet an improvement by the technical solution of this
invention, the hanging buckle comprises a hanging member having a
triangular section, a first buckle plate and a second buckle plate
at two sides of the bottom of the hanging member respectively. The
inner sides of the first buckle plate and the second buckle plate
are provided with a fastener respectively. The fastener cooperates
with a fastener installation hole at the top of the outer frame.
The conductive bar of the polar plate is inserted in a hollow
chamber of the hanging member. By using such a hanging buckle, the
structure thereof can be simplified, mounting of the outer frame
and the conductive bar can be facilitated, and the diaphragm cloth
can be fixed therewith. A certain distance can be kept between the
diaphragm cloth and the polar plate thereby helping to improve the
product quality. In addition, because the hanging member has a
triangular section, grooves can be provided to the polar plate
easily and short circuits between the cathode and the anode can be
prevented.
[0022] In the device for inductively suppressing acid mist from
electrowinning of this invention, the polar plate is an anode
plate.
[0023] This invention also provides a process for inductively
suppressing acid mist from electrowinning by using the above
device. The process comprising the steps of:
[0024] providing the first and second isolation nets at the left
and right sides of an anode plate respectively and leave gaps
between the first and second isolation nets and the left and right
sides of the anode plate, respectively;
[0025] connecting the first isolation net to a side of the anode
plate by the first insulating connecting member, and connecting the
second isolation net to a side of the anode plate by the second
insulating connecting member;
[0026] providing the first and second isolation pieces at two sides
of a top of the anode plate respectively such that the first and
second isolation pieces are respectively located above the first
and second isolation nets, thereby forming the device for
inductively suppressing acid mist from electrowinning;
[0027] arranging the device for inductively suppressing acid mist
from electrowinning thus obtained and a cathode plate in an
electrowinning cell with a spacing therebetween and leaving the
spacing between the adjacent devices for inductively suppressing
acid mist from electrowinning being 50-150 mm; and
[0028] after arrangement of the device for inductively suppressing
acid mist from electrowinning and the cathode plate in the
electrowinning cell, bubbles being generated from the anode plate
and flowing in a bottom-to-top direction between the first and
second isolation nets, when the bubbles reaching a liquid surface
of electrowinning liquid, acid mist in the bubbles being blocked by
the first and second isolation pieces while gas in the bubbles
overflowing through the first and second isolation pieces.
[0029] The process of this invention is simple. By using the above
device for inductively suppressing acid mist from electrowinning,
the process can prevent formation of acid mist during an
electrowinning process and eliminate acid mist pollution.
[0030] In the device for inductively suppressing acid mist from
electrowinning, a spacing between adjacent acid mist suppression
devices is set to 50-150 mm. If this spacing is less than 50 mm,
the electrowinning reaction therebetween may be affected. If this
spacing is greater than 150 mm, because length or width of a cell
surface of an electrowinning cell is limited, the number of the
acid mist suppression devices to be arranged in the electrowinning
cell will substantially reduce thereby affecting the electrowinning
efficiency.
[0031] As an improvement by the technical solution of this
invention, after the step of providing the first and second
isolation pieces at two sides of the top of the anode plate
respectively such that the first and second isolation pieces are
respectively located above the first and second isolation nets, the
process further comprises the steps of:
[0032] selecting the diaphragm cloth, the inner frame and the outer
frame that meet a certain requirement, and embedding the selected
diaphragm cloth in the outer frame via the inner frame; and
[0033] inserting the anode plate, together with the first and
second isolation nets and the first and second isolation pieces, in
the inner frame, and connecting the first and second isolation
pieces with the diaphragm cloth, in which:
[0034] a gap between the first isolation net and the side of the
anode plate is 2-50 mm, and a gap between the second isolation net
and the side of the anode plate is 2-50 mm.
[0035] If the gap between the first and second isolation nets and
the two sides of the anode plate is less than 2 mm respectively,
circulation of the electrowinning liquid will be hindered and thus
guiding of the gas to ascend will be hindered. If the gap is
greater than 50 mm respectively, the size of the device for
inductively suppressing acid mist from electrowinning will be
increased unnecessarily, which will make operations thereof
inconvenient and will cause the first and second isolation nets to
be ineffective.
[0036] In addition, in the description of this invention, if any
means are not specially described, it means that they can be
realized by conventional technical means in the art.
[0037] Therefore, the device and process for inductively
suppressing acid mist from electrowinning as provided by this
invention can prevent formation of acid mist during an
electrowinning process, eliminate acid mist pollution and realize a
clean production.
BRIEF DESCRIPTION OF THE DRAWINGS
[0038] FIG. 1 is a schematic drawing showing a device for
inductively suppressing acid mist from electrowinning of the
present invention;
[0039] FIG. 2 is a schematic drawing of the polar plate;
[0040] FIG. 3 is a side view of FIG. 2;
[0041] FIG. 4 is a close-up view of the part A in FIG. 3;
[0042] FIG. 5 is a schematic drawing of the diaphragm cloth;
[0043] FIG. 6 is a schematic drawing of the outer frame;
[0044] FIG. 7 is a schematic drawing of the inner frame;
[0045] FIG. 8 is a schematic drawing of the hanging buckle.
EXPLANATION TO REFERENCE LABELS IN THE DRAWINGS IS AS FOLLOWS
[0046] 1-polar plate; 1.1-conductive bar; 2-hanging buckle;
2.1-hanging member; 2.2-first buckle plate; 2.3-second buckle
plate; 2.4-fastener; 3-first isolation net; 4-second isolation net;
5-first isolation piece; 6-second isolation piece; 7-outer frame;
7.1-fastener installation hole; 8-inner frame; 9-diaphragm cloth;
10-first insulating connecting member; 11-second insulating
connecting member; 12-buckle; 13-first insulating loop bar;
14-second insulating loop bar; 15-loop bar fixing sleeve.
DETAILED DESCRIPTION TO THE EMBODIMENTS
[0047] To make the purposes and technical solutions of this
invention more clear, hereinafter the invention is described in
detail with reference to the drawings and the embodiments. It
should be understood that the specific embodiments described herein
are only intended to explain rather than limit this invention.
Embodiment I
[0048] FIG. 1 shows a device for inductively suppressing acid mist
from electrowinning which comprises a polar plate 1.
[0049] As shown in FIGS. 2-3, a first isolation net 3 and a second
isolation net 4 are respectively provided at the left and right
sides below the top of the polar plate 1. The first isolation net 3
and the left side of the polar plate 1 are connected by a first
insulating connecting member 10 and the second isolation net 4 and
the right side of the polar plate 1 are connected by a second
insulating connecting member 11. Gaps are provided between the
first and second isolation nets 3, 4 and the left and right sides
of the polar plate respectively.
[0050] As shown in FIGS. 2-3, a first isolation piece 5 and a
second isolation piece 6 are respectively provided to the left and
right sides of the top of the polar plate 1 by a fixing assembly
and the first isolation piece 5 and second isolation piece 6 are
respectively located above the first and second isolation nets 3,
4. As shown in FIG. 4, the fixing assembly includes a buckle 12, a
first insulating loop bar 13 and a second insulating loop bar 14.
The first and second insulating loop bars 13, 14 extend at the left
and right sides of the buckle 12 respectively. The first insulating
loop bar 13 and the second insulating loop bar 14 are sleeved by a
loop bar fixing sleeve 15 respectively. The first isolation piece 5
is clipped between the first insulating loop bar 13 and the left
side of the polar plate 1 and the second isolation piece 6 is
clipped between the second insulating loop bar 14 and the right
side of the polar plate 1.
[0051] In addition, this invention further comprises an acid mist
frame plate group including an outer frame 7, an inner frame 8 and
a diaphragm cloth 9. Structures of the outer frame 7, the inner
frame 8 and the diaphragm cloth 9 are shown in FIGS. 6, 7 and 5
respectively. As shown in FIG. 1, the diaphragm cloth 9 is embedded
in the outer frame 7 via the inner frame 8. The polar plate 1,
together with the first and second isolation nets 3, 4 and the
first and second isolation pieces 5, 6, is inserted into the inner
frame 8. The first and second isolation pieces 5, 6 are connected
to the diaphragm cloth 9 respectively. Both ends of the top of the
outer frame 7 are connected to a conductive bar 1.1 at the top of
the polar plate 1 by a hanging buckle 2.
[0052] The polar plate 1 is an anode plate.
[0053] The gap between the first isolation net 3 and the left side
of the polar plate 1 is 2-50 mm and it may be 2, 5, 8, 10, 12, 14,
19, 27, 36, 40, 43, 47 or 50 mm or other suitable values. The gap
between the second isolation net 4 and the right side of the polar
plate 1 is 2-50 mm and it may be 2, 4, 7, 9, 10, 13, 17, 19, 20,
24, 27, 30, 36, 41, 47 or 50 mm or other values.
[0054] The outer frame 7 is provided with grids with each grid
having a size larger than 2*2 mm or having a diameter larger than 2
mm. Both the outer and inner frames 7, 8 are made of non-metal
materials, such as plastics, glass steel or the like. The diaphragm
cloth 9 is made of chemical fibers, such as polyester fibers,
acrylic fibers, polyamide fibers or the like.
[0055] The first and second insulating loop bars 13, 14 are
circular or square in shape and made of non-metal materials which
have certain rigidity. Thus the clipping degree between the first
insulating loop bar 13 (or the second insulating loop bar 14) and
the first isolation piece 5 (or the second isolation piece 6) can
be improved.
[0056] Both the first and second isolation pieces 5, 6 are mounted
at a gas-liquid boundary at the top of the polar plate 1. In other
words, a part of the first and second isolation pieces 5, 6 are
located below the liquid surface and a part thereof above the
liquid surface. The gas-liquid boundary is 5-50 mm higher than the
liquid surface. Specifically, the gas-liquid boundary may be 5, 7,
10, 14, 17, 19, 23, 26, 30, 35, 39, 43, 47 or 50 mm higher than the
liquid surface. Length of the polar plate 1 below the liquid
surface is 5-50 mm and it may be 5, 8, 11, 15, 18, 21, 25, 27, 29,
34, 37, 44, 47 or 50 mm. By adopting the above designs, bubbles can
be prevented from bursting on the gas-liquid interface which
effectively reduces corrosion of the interface of the anode plate.
In this embodiment, Distance between the anode and cathode plates
is 10-100 mm and it may be 10, 15, 20, 26, 31, 40, 56, 68, 72, 79,
85, 90 or 100 mm
[0057] In this embodiment, the first and second isolation pieces 5,
6 are made of PP cotton.
Embodiment II
[0058] This embodiment is basically the same as Embodiment I. The
only difference is that this embodiment defines the hanging buckle
as below:
[0059] As shown in FIG. 8, the hanging buckle 2 comprises a hanging
member 2.1 having a triangular section, a first buckle plate 2.2
and a second buckle plate 2.3 at two sides of the bottom of the
hanging member 2.1 respectively. The inner sides of the first
buckle plate 2.2 and the second buckle plate 2.3 are provided with
a fastener 2.4 respectively. The fastener 2.4 cooperates with a
fastener installation hole 7.1 at the top of the outer frame 7. The
conductive bar 1.1 of the polar plate 1 is inserted in a hollow
chamber of the hanging member 2.1. By using the above structure,
the hanging buckle 2 has a simple structure, mounting between the
outer frame 7 and the conductive bar 1.1 can be facilitated and the
diaphragm cloth 9 can be fixed such that a certain distance is kept
between the diaphragm cloth 9 and the polar plate 1. This can
improve product quality.
[0060] In addition, because the hanging member 2.1 has a triangular
section, grooves can be provided to the polar plate easily and
short circuits between the cathode and anode can be prevented.
Embodiment III
[0061] This embodiment is basically the same as Embodiment I and it
differs from Embodiment I as follows:
[0062] An upper portion of the polar plate 1 is provided with a
stopper plate that is spirally inclined downwards, such that the
acid mist blocked by the stopper plate condenses and flows back to
the electrochemical reaction cell, which can help prevent formation
of acid mist on the cell surface.
Embodiment IV
[0063] This embodiment is basically the same as Embodiment I and it
differs from Embodiment I as follows:
[0064] At least one filtering net is provided inside the first and
second isolation pieces respectively to filter the acid mist
carried by the gas.
Embodiment V
[0065] This embodiment provides a process for inductively
suppressing acid mist from electrowinning by using the above
device. The process comprises the steps of:
[0066] Step (1): providing the first and second isolation nets at
the left and right sides of an anode plate respectively, and
leaving gaps between the first and second isolation nets and the
left and right sides of the anode plate respectively;
[0067] Step (2): fixedly connecting the first isolation net to the
left side of the anode plate by the first insulating connecting
member, and fixedly connecting the second isolation net to the
right side of the anode plate by the second insulating connecting
member;
[0068] Step (3): providing the first and second isolation pieces at
the left and right sides of the top of the anode plate respectively
such that the first and second isolation pieces are respectively
located above the first and second isolation nets;
[0069] Step (4): selecting the diaphragm cloth, the inner frame and
the outer frame as required and embedding the selected diaphragm
cloth in the outer frame via the inner frame; the warp and weft
density of the diaphragm cloth is (50-600)*(50-600) which can
improve the effect of isolating bubbles by the diaphragm cloth;
length of the diaphragm cloth is greater than that of the inner
frame by 2-5 mm, or specifically by 2, 3, 4 or 5 mm; width of the
diaphragm cloth is greater than that of the inner frame by 2-5 mm,
or specifically by 2, 3, 4, 4.5 or 5 mm; length of the inner frame
is smaller than that of the outer frame by 3-10 mm, or specifically
by 3, 3.5, 4.2, 5, 5.3, 6.4, 7, 8.5 or 10 mm; and width of the
inner frame is smaller than that of the outer frame by 3-10 mm, or
specifically by 3, 3.7, 4.6, 5.6, 6.6, 7.8, 9 or 10 mm; these
configuration can all facilitate installation of the diaphragm
cloth, the inner frame and the outer frame;
[0070] Step (5): inserting the anode plate, together with the first
and second isolation nets and the first and second isolation
pieces, in the inner frame, and connecting the first and second
isolation pieces to the diaphragm cloth to form the above device
for inductively suppressing acid mist from electrowinning;
[0071] Step (6): arranging the devices obtained in Step (5) and
cathode plates in an electrowinning cell with equal spacing with
the spacing between the adjacent acid mist suppressing devices
being 50-150 mm;
[0072] Step (7): after arranging the acid mist suppressing devices
and the cathode plates in the electrowinning cell, bubbles are
generated from the anode plate and flow in a bottom-to-top
direction between the first and second isolation nets; when the
bubbles reach a liquid surface of an electrowinning liquid, acid
mist in the bubbles are blocked by the first and second isolation
pieces while gas in the bubbles overflow through the first and
second isolation pieces.
[0073] The flow rate of the electrowinning liquid in the above
electrowinning cell is 10-1,000 L/min, or specifically 10, 30, 100,
200, 370, 480, 520, 600, 735, 846 or 1,000 L/min. Temperature of
the electrowinning liquid is between 20 and 75.degree. C., or
specifically 20, 28, 37, 44, 50, 63, 70 or 75.degree. C.
[0074] In this embodiment, the electrowinning liquid includes the
compositions of an electrowinning copper solution which contains
H.sub.2SO.sub.4 with a concentration of 100-180 g/L and Cu.sup.2+
with a concentration of 30-50 g/L.
Embodiment VI
[0075] This embodiment is basically the same as Embodiment V and it
differs from Embodiment V as follows:
[0076] In this embodiment, the electrowinning liquid is an
electrowinning zinc solution, which contains H.sub.2SO.sub.4 with a
concentration of 100-200 g/L and Zn.sup.2+ with a concentration of
30-50 g/L.
Embodiment VII
[0077] This embodiment is basically the same as Embodiment V and it
differs from Embodiment V as follows:
[0078] In this embodiment, the electrowinning liquid is an
electrowinning nickel solution, which contains H.sub.2SO.sub.4 with
a concentration of 10-60 g/L and Ni.sup.2+ with a concentration of
40-80 g/L.
Embodiment VIII
[0079] This embodiment is basically the same as Embodiment V and it
differs from Embodiment V as follows:
[0080] In this embodiment, the electrowinning liquid is an
electrowinning manganese solution, which contains H.sub.2SO.sub.4
with a concentration of 10-50 g/L, Mn.sup.2+ with a concentration
of 15-30 g/L, and (NH.sub.4).sub.2SO.sub.4 with a concentration of
120-180 g/L.
[0081] It should be understood that improvements or modifications
may be made by those skilled in the art based on the above
descriptions and all such improvements or modifications shall fall
into the protection scope of the appended claims of this
invention.
* * * * *