Auxiliary device for preventing tin ion depletion in tin electrolysis

Abstract

The utility model discloses an auxiliary device for preventing tin ion depletion in tin electrolysis. The auxiliary device comprises a cathode frame, an ion exchange membrane and an insertion plate, the cathode is placed at the open end of the top of the cathode frame, and the ion exchange membrane is bonded and fixed on the peripheral side and the outer bottom wall of the cathode frame to define an inner cavity of the cathode frame; a liquid inlet hole is formed in a frame beam at the bottom end of the cathode frame to be communicated with an inner cavity defined by the ion exchange membrane; and the insertion plate is slidably connected to the outer wall of the frame beam on one side of the cathode frame to open and close the liquid inlet hole. According to the utility model, the cathode frame is placed in the electrolytic bath, the electrolyte can be filled in the inner cavity of the cathode frame through the liquid inlet hole, the insertion plate slides downwards to close the liquid inlet, metal tin in the anode in the electrolytic bath enters the electrolyte in an ion form, and tin ions in the electrolyte in the cathode frame are deposited on the cathode; however, tin ions in the electrolyte outside the cathode frame are blocked by the ion exchange membrane and cannot be deposited on the cathode, at the moment, the electrochemical dissolution rate of tin is larger than electrochemical deposition, and the problem that main metal tin ions are depleted in the tin soldering electrolysis process is effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to soldering electrolysis technical field more particularly is related to a kind of auxiliary device of tin electrolysis anti-tin ion depletion. BACKGROUND

[0002] When the electrochemical dissolution rate is less than the electrochemical deposition rate during soldering electrolysis, or tin is extracted from the electrolyte during the indium extraction process after soldering electrolysis, a large amount of tin ions in the raffinate returned to the electrolysis system are lost, the concentration of tin ions in the electrolyte decreases, and ion depletion occurs. In severe cases, the abnormal cathode crystallization caused by concentration polarization leads to a significant decrease in electrical efficiency, a sharp increase in production labor intensity and energy consumption cost. The commonly used solution is to use stannous oxide or soluble salt to dissolve and supplement its concentration. When the enterprise does not produce such goods, it needs to purchase from outside, but the price is higher than the price of the enterprise product-precision tin ingot, resulting in increased production cost. Or maintain the balance between electrochemical dissolution and electrochemical deposition by increasing the grade of the anode main metal and reducing the impurity content. The enterprise may be limited by the process and unable to meet this requirement, and excessive increase of the anode grade is contrary to the characteristics of impurity removal in the electrolysis process.

[0003] Therefore, how to provide a device that can prevent the depletion of main metal tin ions during soldering electrolysis, solve the problem of tin ion depletion in the electrolyte, and without any impurities entering the electrolysis system, without affecting the product quality, is a problem that needs to be solved by the skilled in the art. UTILITY MODEL CONTENT

[0004] Therefore, the utility model provides a kind of auxiliary device of tin electrolysis anti-tin ion depletion, easy to implement, low cost, good combination with soldering electrolysis production, quickly and efficiently solve the problem of tin ion depletion in electrolyte and without any impurities entering electrolysis system, without affecting the product quality.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A kind of auxiliary device of tin electrolysis anti-tin ion depletion, including cathode frame, ion exchange membrane and plugboard;

[0007] The cathode frame top open end places cathode, and the ion exchange membrane is bonded and fixed on the outer peripheral side and outer bottom wall of the cathode frame to form the inner cavity of the cathode frame;

[0008] Liquid inlet hole is set on the bottom end frame beam of the cathode frame to communicate with the inner cavity surrounded by the ion exchange membrane;The plugboard is slidingly connected on the frame beam outer wall of one side of the cathode frame to open and close the liquid inlet hole.

[0009] The beneficial effects of the above technical scheme are that the cathode plate is placed in the cathode frame, the anode is placed in the electrolytic tank, the cathode frame is placed in the electrolytic tank, one end of the cathode is in contact with the conductive copper bar, and the other end is in an insulating state; the plug plate slides upward, the liquid inlet is opened, the electrolyte can quickly overflow into the inner cavity surrounded by the ion exchange membrane through the liquid inlet hole, the plug plate slides downward to close the liquid inlet, the electrolytic system is powered on, the metal tin in the anode in the electrolytic tank is normally electrochemical dissolved to enter the electrolyte in the form of ions, the tin ions in the electrolyte in the cathode frame are deposited on the cathode, but the tin ions in the electrolyte outside the cathode frame cannot be deposited on the cathode due to the blocking of the ion exchange membrane, and since other conditions in the system have not changed, the electrochemical dissolution rate of tin is greater than the electrochemical deposition rate at this time, and enrichment is formed in the electrolyte, effectively solving the problem of depletion of main metal tin ions in the soldering tin electrolysis process.

[0010] Preferably, the cathode frame comprises a T-shaped plate and a side strip, the number of the T-shaped plate is two and is arranged oppositely, the horizontal plate and the vertical plate of the two T-shaped plates are arranged perpendicularly to each other and the surface plates thereof are located in the same plane, and a plurality of square grooves are formed in the surface plates of the vertical plates of the two T-shaped plates; the number of the side strip is multiple, and the multiple side strips are fixed on the circumferential sides of the two opposite side surface plates of the two T-shaped plates. The two T-shaped plates are connected by the U-shaped side strip to form the cathode frame, the T-shaped plate can be clamped on the electrolytic tank, and the cations in the electrolytic tank can be prevented from entering the inner cavity of the cathode frame by the ion exchange membrane.

[0011] Preferably, the T-shaped plate is a PVC plate, the number of the side strip is three, the three side strips are connected end to end to form a U-shaped strip, and the U-shaped surfaces on both sides of the U-shaped strip are fixed on the two opposite side surface plates of the two T-shaped plates by plastic welding. The PVC material will not dissolve in the electrolytic tank, and no additional impurities will enter the soldering tin electrolysis system during the electrolysis process, thereby ensuring the quality of the electrolytic product.

[0012] Preferably, the bottom closed end of the U-shaped strip is provided with the liquid inlet hole, and the two limbs of the U-shaped strip are provided with limiting grooves, and the plug plate is inserted into the limiting grooves to open and close the liquid inlet hole. The opening and closing of the liquid inlet hole are realized by sliding the plug plate up and down along the limiting grooves.

[0013] Preferably, the limiting grooves are two and are arranged in an upper and lower interval along the two limbs of the U-shaped strip, and the plug plate is sequentially inserted into the two limiting grooves arranged in an upper and lower interval; a plurality of limiting clamps are fixed on the side surface plate of the plug plate away from the U-shaped surface of the U-shaped strip between the two limiting grooves. The limiting clamps can prevent the plug plate from being pulled out of the limiting grooves, and ensure that the plug plate can close the liquid inlet hole under the action of gravity after the lifting rope is pulled out.

[0014] Preferably, the pulling rope is fixed at one end on the top surface of the plug-in plate and extends to the top surface of the cathode frame.

[0015] Preferably, the ion exchange membrane is fixed on the panel of the T-shaped plate by C-PVC glue, and the peripheral side of the ion exchange membrane is pressed and bonded with the panel of the T-shaped plate by a PVC pressing strip. When the ion exchange membrane edge is bonded by C-PVC glue and PVC pressing strip, a positive pressure is applied, and after the glue is cured, the subsequent cathode frame bonding step is implemented, and the bonding process is not overheated to cause the pressing strip to peel off, so as to ensure that the ion exchange membrane can be firmly adhered to the peripheral side and bottom surface of the cathode frame.

[0016] Preferably, the liquid inlet hole has a hole diameter of not less than 40 mm. The electrolyte in the electrolytic tank can quickly enter the cathode frame.

[0017] According to the above technical scheme, compared with the prior art, the auxiliary device for preventing tin ion depletion in tin electrolysis provided by the utility model has the following beneficial effects:

[0018] 1. Simple to make. After purchasing the corresponding number of ion exchange membranes on the market, the device can be made in one working day and put into use in the third working day. Moreover, the device can be reused, and during use, the device is placed in the electrolytic tank, the cathode is inserted into the device when the tank is loaded, and the device is lifted out of the electrolytic tank together with other electrode pieces when the tank is unloaded. The device does not need to be moved, and does not affect the normal loading and unloading of electrolytic refining.

[0019] 2. Suitable for soldering electrolytic system, without the need to invest a large amount of money to purchase stannous oxide or soluble salt products for dissolution to solve depletion; seamlessly connected with electrolytic production, suitable for current soldering electrolytic process control parameters, equipment and site.

[0020] 3. The effect is obvious. Since the tin ions outside the ion exchange membrane cannot form deposition on the cathode in the cathode frame, the deposition amount of the cathode in the electrolysis process is converted into the enrichment amount of the electrolyte, which can solve the problem of abnormal crystallization and decreased electric efficiency caused by concentration polarization.

[0021] 4. The device is made of insoluble material, and there is no additional impurity entering the soldering electrolytic system, which has no effect on the quality of electrolytic products. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the provided drawings.

[0023] Figure 1 The auxiliary device provided by the present application is a front view.

[0024] Figure 2 The cathode frame provided by the present application is a front view.

[0025] Figure 3 The cathode frame provided by the present application is a side view.

[0026] Figure 4 The edge strip arrangement provided by the present application is a front view.

[0027] Figure 5 The electrolytic process flow chart for improving tin ion concentration provided by the present application.

[0028] Among them,

[0029] 1-cathode frame; 11-T-shaped plate; 12-supporting strip; 13-liquid inlet hole; 14-square groove; 15-edge strip; 2-ion exchange membrane; 3-limiting groove; 4-inserting plate; 41-limiting clamp; 5-lifting rope; 6-pressing strip. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0031] Referring to the drawings, Figures 1 to 4 The embodiments of the present application disclose an auxiliary device for preventing tin ion depletion in tin electrolysis, which comprises a cathode frame 1, an ion exchange membrane 2 and an inserting plate 4.

[0032] The cathode plate is placed at the open end of the top of the cathode frame 1, and the ion exchange membrane 2 is adhesively fixed to the outer circumferential side and the outer bottom wall of the cathode frame 1 to form an inner cavity of the cathode frame 1.

[0033] The liquid inlet hole 13 is formed in the bottom end frame beam of the cathode frame 1 to communicate with the inner cavity surrounded by the ion exchange membrane 2; and the inserting plate 4 is slidingly connected to the outer wall of the frame beam on one side of the cathode frame 1 to open and close the liquid inlet hole 13.

[0034] In use, the cathode plate is placed in the cathode frame, the cathode frame is placed in the electrolytic cell, one end of the cathode is in contact with the conductive copper bar, and the other end is in an insulating state; the plug plate is slid upward, the liquid inlet is opened, and the electrolyte can quickly overflow in the cavity of the cathode frame through the liquid inlet hole. The plug plate is slid downward to close the liquid inlet. The electrolytic system is powered on, the metal tin in the anode in the electrolytic cell is normally electrochemically dissolved to form ions, and the tin ions in the electrolyte in the cathode frame are deposited on the cathode. However, the tin ions in the electrolyte outside the cathode frame cannot be deposited on the cathode due to the blocking of the ion exchange membrane. Since other conditions in the system have not changed, the electrochemical dissolution rate of tin is greater than the electrochemical deposition rate, and a rich tin ion is formed in the electrolyte, effectively solving the problem of depletion of main metal tin ions in the soldering tin electrolysis process.

[0035] In order to further optimize the above technical scheme, the cathode frame 1 comprises T-shaped plates 11 and edge strips 15, the number of T-shaped plates 11 is two and they are arranged oppositely, the horizontal plate and the vertical plate of the two T-shaped plates 11 are arranged perpendicularly to each other and the surface plates thereof are located in the same plane, and a plurality of square grooves 14 are formed on the surface plates of the vertical plates of the two T-shaped plates 11; the number of edge strips 15 is multiple, and the multiple edge strips 15 are fixed on the circumferential sides of the two opposite side surface plates of the two T-shaped plates 11. The multiple square grooves 14 are separated by support strips 12.

[0036] As shown in Figure 2 , four square grooves are formed on the surface plate of the T-shaped plate, and the support strips between the four square grooves can ensure the strength of the T-shaped plate and prevent deformation and damage of the cathode frame during entering or lifting out of the electrolytic cell.

[0037] In order to further optimize the above technical scheme, the T-shaped plate 11 is a PVC plate, the number of edge strips 15 is three, the three edge strips 15 are connected end to end to form a U-shaped strip, and the U-shaped surfaces on both sides of the U-shaped strip are fixed on the two opposite side surface plates of the two T-shaped plates 11 by plastic welding.

[0038] As shown in Figure 4 , the cathode frame body is two hollow T-shaped plates, the two T-shaped plates are fixed by a U-shaped strip by plastic welding, and the direction is shown in Figure 4 , the length x width x thickness of the edge strips of the two limbs of the U-shaped strip is 1385 x 60 x 10 mm; the length x width x thickness of the closed end of the bottom of the U-shaped strip is 87 x 60 x 10 mm, and the width of the U-shaped groove of the U-shaped strip is slightly larger than the thickness of the cathode plate.

[0039] In this embodiment, the width of the support strip is 50 mm, and the frame with a width of 100 mm is reserved on the upper and lower edges of the T-shaped plate.

[0040] In order to further optimize the above technical scheme, the bottom closed end of the U-shaped strip is provided with a liquid inlet hole 13, and the two limbs of the U-shaped strip are provided with limiting grooves 3, and the plug plate 4 is inserted into the limiting grooves 3 to open and close the liquid inlet hole 13.

[0041] Two T-shaped plates are connected through a U-shaped strip, the groove wall of the U-shaped groove of the U-shaped strip is surrounded by an ion exchange membrane to form a closed inner cavity with the T-shaped plate, a limiting groove is formed on the U-shaped strip, the face plate of the plug plate covers the limiting groove and can slide up and down along the limiting groove, and the plug plate is used to open and close the liquid inlet hole.

[0042] In order to further optimize the above technical scheme, prevent the plug plate from falling out of the limiting groove, and ensure that the plug plate can close the liquid inlet hole during free falling, the limiting grooves 3 are arranged in two and spaced apart upward and downward along the two limbs of the U-shaped strip, and the plug plate 4 is sequentially inserted into the two limiting grooves 3 arranged upward and downward from top to bottom; a plurality of limiting clamps 41 are fixed on the side panel of the plug plate 4 away from the U-shaped surface of the U-shaped strip between the two limiting grooves 3.

[0043] In order to further optimize the above technical scheme, it also includes a lifting rope 5, one end of the lifting rope 5 is tied and fixed on the top surface of the plug plate 4, and the other end extends to the top surface of the cathode frame 1.

[0044] The plug plate is pulled by the lifting rope, the plug plate can slide along the limiting groove, the plug plate is upwardly slid to open the liquid inlet hole, and the plug plate is downwardly slid to close the liquid inlet hole.

[0045] In order to further optimize the above technical scheme, the ion exchange membrane 2 is fixed on the outer surface of the T-shaped plate 11 by C-PVC adhesive, and the peripheral side of the ion exchange membrane 2 is tightly bonded with the outer surface of the T-shaped plate 11 by the PVC material pressing strip 6.

[0046] An insulating material PVC resistant to acid and alkali is selected to make a hollow cathode frame capable of accommodating a cathode, the ion exchange membrane is completely covered in the hollow part, and the membrane is clamped and tightly pressed in the middle by using C-PVC adhesive and PVC pressing strip. In order to ensure that the anode does not break during electrolysis, the size of the container is determined according to the size of the cathode, and the container is made according to the actual demand for convenience of taking and loading the electrode plate. When the ion exchange membrane edge is bonded by using C-PVC adhesive and PVC pressing strip, a positive pressure is applied, and after the adhesive is completely cured, the subsequent cathode frame bonding step is implemented, and attention is paid to prevent overheating during the bonding process to cause the pressing strip to be detached.

[0047] In order to further optimize the above technical scheme, ensure that the electrolyte can quickly fill the cathode frame, and the aperture of the liquid inlet hole 13 is not less than 40mm.

[0048] The tin electrolysis auxiliary device provided by the embodiment is used by placing the cathode frame in the electrolytic cell, the protruding part at the top of the T-shaped plate can be clamped on the electrolytic cell, the electrolyte flows in through the liquid inlet hole at the bottom of the cathode frame, the lifting rope is lowered when the two ear support frames of the cathode frame fall on the electrolytic cell and the electrolyte in the frame is consistent with the liquid level in the electrolytic cell, the plug is naturally lowered to close the liquid inlet hole, then the cathode is installed in the cathode frame to replace a cathode in the electrolytic cell and simultaneously contact the cathode in the cell in the same direction to conduct electricity through the copper bar, in the electrolysis process, the cathode in the frame only plays a role of conducting circuit after the tin ions in the frame are deposited, the large-diameter tin cations in the electrolyte outside the cathode frame are hindered by the ion exchange membrane and stay in the electrolyte in the electrolytic cell, that is, the characteristics of the ion exchange membrane are used, after electricity is conducted, the anode main metal electrochemical dissolution reaction in the aqueous solution electrolysis system and the cathode metal electrochemical deposition are realized, so that the electrochemical dissolution > electrochemical deposition effect is achieved, and the main metal ion enrichment is realized, thereby solving the problem of tin electrolysis depletion.

[0049] After testing, the cathode is placed in the cathode frame to replace a cathode in the electrolytic cell, the total volume of the electrolyte in the electrolytic cell is 250 m 3 The electrolyte system is operated by electricity, the anode tin grade is 72.4%, the direct current is 8500 A, the seven-day cycle condition is used, and the electrolytic cell is weighed: the average of the cathodes in the cell is 88.407 kg / piece, the cathode in the cathode frame is 27.1 kg, the tin ion in the electrolyte in the same period is increased by 0.17 g / L. The average of the residual cathode rate in the same period is 43.05%, and the residual cathode rate in the cell is 43.55%.

[0050] When the cathode in the cathode frame replaces two cathodes in the electrolytic cell, the anode tin grade is 76.3%, the direct current is 8500 A, the seven-day cycle condition is used, and the electrolytic cell is weighed: the average of the cathodes in the cell is 87.394 kg / piece, the cathode in the container is 25.5 kg, the tin ion in the electrolyte in the same period is increased by 0.35 g / L. The average of the residual cathode rate in the same period is 42.07%, and the residual cathode rate in the cell is 42.13%.

[0051] The application range of the device in the soldering tin electrolysis is respectively: temperature 28-60℃, divalent tin ion concentration 20-70 g / L, free acid 25-80 g / L, current density 107-127 A / m2, anode tin grade 64-80%, electrolysis cycle 6-7 days.

[0052] Before the device is used, the soldering tin electrolysis system in the workshop causes the tin ion in 252 square meters of electrolyte to be depleted from 113 g / L to 30.01 g / L due to the loss of co-extraction tin; after the device is used, the tin ion has been increased to 66 g / L.

[0053] The various embodiments described in this specification are presented by way of example, and each embodiment is presented for the purpose of conveying the novelty and inventive aspects of the present patent application. Each embodiment is presented in a progressive and explanatory manner, and each embodiment highlights differences from other embodiments. The same or similar parts and / or functions between embodiments are to be understood as mutual references among the embodiments.

[0054] The above description of disclosed embodiments enables one of ordinary skill in the art to make and use the patent application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the patent application. Thus, the present patent application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An auxiliary device for preventing tin ion depletion in tin electrolysis, characterized in that, Cathode frame (1), ion exchange membrane (2) and plug-in plate (4) are included. The cathode plate is placed at the open top end of the cathode frame (1), and the ion exchange membrane (2) is fixed and bonded on the outer peripheral side and the outer bottom wall of the cathode frame (1) to enclose the inner cavity of the cathode frame (1). The liquid inlet hole (13) is arranged on the bottom end frame beam of the cathode frame (1) to communicate with the inner cavity enclosed by the ion exchange membrane (2); and the plug-in plate (4) is slidingly connected to the outer wall of the frame beam on one side of the cathode frame (1) to open and close the liquid inlet hole (13).

2. An auxiliary device for preventing tin ion depletion in tin electrolysis according to claim 1, characterized in that, The cathode frame (1) includes T-shaped plates (11) and edge strips (15), the number of the T-shaped plates (11) is two and they are oppositely arranged, the horizontal plates and vertical plates of the two T-shaped plates (11) are perpendicularly arranged and their face plates are located in the same plane, and a plurality of square grooves (14) are arranged on the face plates of the vertical plates of the two T-shaped plates (11); the number of the edge strips (15) is multiple, and the multiple edge strips (15) are fixed to the peripheral sides of the two side face plates of the two T-shaped plates (11).

3. An auxiliary device for preventing tin ion depletion in tin electrolysis according to claim 2, characterized in that, The T-shaped plates (11) are PVC plates, the number of the edge strips (15) is three, the three edge strips (15) are connected end to end to form a U-shaped strip, and the U-shaped faces on the two sides of the U-shaped strip are fixed on the two side face plates of the two T-shaped plates (11) by plastic welding.

4. An auxiliary device for preventing tin ion depletion in tin electrolysis according to claim 3, characterized in that, The bottom closed end of the U-shaped strip is provided with the liquid inlet hole (13), the two limbs of the U-shaped strip are provided with limiting grooves (3), and the plug-in plate (4) is inserted into the limiting grooves (3) to open and close the liquid inlet hole (13).

5. An auxiliary device for preventing tin ion depletion in tin electrolysis according to claim 4, characterized in that, The limiting grooves (3) are two and are arranged in an up-down interval along the two limbs of the U-shaped strip, and the plug-in plate (4) is sequentially inserted into the two limiting grooves (3) arranged in an up-down interval; a plurality of limiting clamps (41) are fixed on the side face plate of the plug-in plate (4) away from the U-shaped face of the U-shaped strip between the two limiting grooves (3).

6. An auxiliary device for preventing tin ion depletion in tin electrolysis according to claim 5, characterized in that, A pulling rope (5) is further included, one end of the pulling rope (5) is fixed on the top face of the plug-in plate (4), and the other end extends to the top face of the cathode frame (1).

7. An auxiliary device for preventing tin ion depletion in tin electrolysis according to claim 6, characterized in that, The ion exchange membrane (2) is fixed and bonded on the face plate of the T-shaped plate (11) by C-PVC glue, and the peripheral side of the ion exchange membrane (2) is pressed and bonded with the face plate of the T-shaped plate (11) by the pressing strip (6) made of PVC material.

8. An auxiliary device for preventing tin ion depletion in tin electrolysis according to claim 1, characterized in that, The hole diameter of the liquid inlet hole (13) is not less than 40 mm.

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