Device and method for inhibiting air holes of sulfated electrodeposited nickel

Abstract

The invention discloses a device and a method for inhibiting air holes in sulfated electrodeposited nickel, relates to the technical field of nickel-cobalt hydrometallurgy electrodeposition equipment, and solves the technical problem of more air holes in the existing sulfated electrodeposited nickel production. The air hole restraining device comprises a stirring box, a stirring device is connected to the stirring box, and the stirring device specifically comprises a motor, a coupler and a speed reducer. The method comprises the following steps: adding three additives, namely A and B type liquid electrodeposition nickel pore inhibition additives and a solid additive, namely sodium dodecyl sulfate, into a stirring box, pumping the three additives into the stirring box through a metering pump, uniformly stirring with water according to a certain proportion, pumping into a precision filter paper filter through a mortar pump, and stirring uniformly to obtain a finished product. And solid particles in the solution are further filtered, and finally the filtered solution enters the clarifying tank so as to complete the subsequent process. According to the device for inhibiting the air holes in the sulfated electrodeposited nickel, the problem that the number of the air holes in the electrodeposited nickel is large is effectively solved, the air hole inhibiting efficiency is greatly improved, and it is ensured that a delicate electrodeposited nickel product is produced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nickel-cobalt hydrometallurgy electrowinning nickel production, more particularly to a device and method for inhibiting pores in sulfatized electrowinning nickel. BACKGROUND

[0002] In the nickel-cobalt hydrometallurgy industry, the production area of electrowinning nickel, due to the adhesion of hydrogen bubbles generated by cathode reaction on the surface of the nickel plate, the nickel plate adsorbs mechanical inclusions of organic matter, the hydrogen bubbles and non-conductive organic matter occupy the position on the surface of the nickel plate, which increases the resistance of the place, forms a "zero charge zone" of nickel, and the nickel cannot be deposited into a vacancy, thereby generating pores. The pores will form small holes in the electrowinning nickel plate, which will destroy the continuity of the metal, leading to a decline in the overall performance of the material; the pores will also reduce the effective area of the load, thereby reducing the load capacity of the material; the stress distribution near the pores is uneven, which is easy to cause stress concentration, leading to a decline in mechanical properties; and the pores will also cause uneven depressions or protrusions on the surface of the electrowinning nickel plate, affecting its appearance quality. Therefore, the inhibition of electrowinning nickel pores will play a very important role in production. SUMMARY

[0003] In view of the problems in the above background art, the present application provides a device and method for inhibiting pores in sulfatized electrowinning nickel.

[0004] The technical solution adopted by the present application is as follows: 1. A device for inhibiting pores in sulfatized electrowinning nickel, comprising a stirring tank, characterized in that: a vertical stirring device is connected to the upper end of the stirring tank; the stirring tank is connected to three additive containers through a quantitative pump, the additive containers comprising: a class A electrowinning nickel pore inhibition additive container, a class B electrowinning nickel pore inhibition additive container, and a sodium dodecyl sulfonate solid additive container; the outlet of the stirring tank is connected to a mortar pump, a precision filter, and a clarifying tank in sequence.

[0005] The vertical stirring device comprises a motor, a speed reducer, a shaft coupling, a rack, a stirring shaft, and a stirring paddle. The stirring shaft is installed with a stirring paddle at one end inside the stirring tank, and is sleeved with a rack fixed to the stirring tank at the other end outside the stirring tank. The rack is fixed with a speed reducer, and the top of the speed reducer is connected with a motor. The speed reducer is connected with the exposed end of the stirring shaft through a shaft coupling. The purpose of stirring is to prevent solid particles from adhering to the electrowinning nickel plate to affect the production efficiency of electrowinning nickel. The degree of stirring is adjusted according to the degree of stirring of the visible solid additive, generally 10s of stirring per 40min during the on-site operation of electrowinning nickel.

[0006] The quantitative pump is configured to pump the additives into the stirring tank in a mass ratio of A-type additive:B-type additive:sodium dodecyl sulfonate = 4:1:2. The A-type nickel electrodeposition pore inhibiting additive (MF-DJ-901(A)) mainly functions to inhibit pores; the B-type nickel electrodeposition pore inhibiting additive (MF-DJ-901(B)) mainly functions to prevent nickel electrodeposition from caking; and the sodium dodecyl sulfonate solid additive mainly functions to cover acid mist. The three additives act together to well inhibit the sulfatized nickel electrodeposition pores.

[0007] The precision filter is configured to filter solid particles with a particle size of ≥1 μm. The filter material of the precision filter has a dense mesh structure, can effectively capture small particles in the solution, has high filtration efficiency and good cleanliness. It can efficiently remove impurities in the solution, reduce the burden of subsequent processing procedures, save energy and reduce processing costs.

[0008] The stirring tank is provided with an electric heater for maintaining the solution temperature in the tank at 80-100℃. Too low a temperature will cause the visible solid particles in the solution to not completely dissolve, and too high a temperature will cause the solution to excessively react, so the temperature needs to be strictly controlled within the process temperature range.

[0009] The mortar pump is a 100UB-ZK60-35D model, has a flow rate of 60 m³ / h, a lift of 35 m, a power of 18.5 KW and a rotating speed of 2950 r / min.

[0010] The volume of the clarifying tank is 4 m 3 , which can well meet the on-site process requirements.

[0011] 2. A sulfatized nickel electrodeposition pore inhibiting method using the device, comprising the following steps: (a) pumping A-type additive, B-type additive and sodium dodecyl sulfonate with a mass ratio of 4:1:2 into the stirring tank through the quantitative pump; (b) adding water to the stirring tank and starting the stirring device to stir at 80-100℃ until the solid additives are completely dissolved; (c) delivering the solution to the precision filter through the mortar pump for fine filtration; (d) guiding the filtrate into the clarifying tank for subsequent treatment.

[0012] The single addition amount of the additives in step (a) is: 20 kg of A-type additive, 5 kg of B-type additive and 10 kg of sodium dodecyl sulfonate; and the addition is repeated twice every 12 hours.

[0013] The vertical stirring device in step (b) adopts an intermittent operation mode: stirring for 10 seconds every 40 minutes.

[0014] The beneficial effects of the present application are as follows: 1. The present application makes the operation of the sulfated nickel electrodeposition pore inhibition device more simple and automatic by connecting the control system to the quantitative pump and the stirring device. The control system can well control the operation and shutdown of the above two devices, making the operation more safe. Secondly, the following parameters can be set on the control system: pump manual operation speed, pump automatic operation speed, pump automatic operation time, pump automatic stop time, stirring speed, stirring automatic operation time, stirring automatic stop time, minimum flow when the pump is running, and maximum flow when the pump is stopped. The control system can realize manual and automatic control, greatly improving the efficiency of the work site and the precision of the process operation.

[0015] 2. The present application installs a precision filter paper filter after stirring, which can further remove invisible solid particles in the solution, greatly improving the purity of the solution and improving the production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic diagram of a sulfated nickel electrodeposition pore inhibition device; Figure legend: 1-quantitative pump, 2-class A nickel electrodeposition pore inhibition additive container, 3-class B nickel electrodeposition pore inhibition additive container, 4-sodium dodecyl sulfonate solid additive container, 5-vertical stirring device, 6-stirring box, 7-corrosion-resistant and wear-resistant mortar pump, 8-precision filter paper filter, 9-clearing tank, 10-motor, 11-reducer, 12-coupling, 13-rack, 14-stirring shaft, 15-stirring paddle. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments.

[0018] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

[0019] Example 1 As Figure 1As shown, the embodiment provides a sulfation nickel electrowinning pore inhibition device and method, which comprises a stirring tank 6, the stirring tank 6 is connected with three kinds of additive containers through a quantitative pump 1, the additive containers comprise: a class of nickel electrowinning pore inhibition additive container 3, a class of nickel electrowinning pore inhibition additive container 4 and a sodium dodecyl sulfonate solid additive container 2, the three kinds of additives are pumped into the stirring tank 6 through the quantitative pump 1, and after adding water, the uniform stirring is realized through a vertical stirring device 5 at the upper part of the stirring tank 6, and then the solution is pumped into a precision filter 8 through a mortar pump 7, and after the filtration is completed, the solution enters a clarifying tank 9.

[0020] In the nickel electrowinning work site, the site workers set the parameters of the sulfation nickel electrowinning pore inhibition device through a control system, set 40kg of a class of nickel electrowinning pore inhibition additive and 10kg of a class of nickel electrowinning pore inhibition additive and 20kg of sodium dodecyl sulfonate solid additive, and add them evenly twice every 12 hours, once 20kg of a class of nickel electrowinning pore inhibition additive and 5kg of a class of nickel electrowinning pore inhibition additive and 10kg of sodium dodecyl sulfonate solid additive, and then add 2.4m 3 of water in the stirring tank 6, and control the temperature in the stirring tank 6 to be 80-100℃; if the temperature is lower than 80℃, the dissolution rate of sodium dodecyl sulfonate is less than 90%, the filter plugging frequency increases by 300%, if the temperature is higher than 105℃, the additive decomposition rate is greater than 15%, and the pore inhibition effect decreases by 40%. Start the vertical stirring device 5, observe the dissolution degree of the visible solid particles in the stirring tank 6, and stop stirring after the visible solid particles are completely dissolved. Start the mortar pump 7, so that the stirred solution enters the precision filter 8, and the solution is more fully filtered. The filtrate after filtration is sent to the clarifying tank 9, and is mixed with the electrolytic catholyte at a volume ratio of 2:1000 for use.

[0021] In addition, based on the same conditions, the influence of different additive ratios on the surface state of the nickel plate is explored, and the results are shown in Table 1 as follows: Table 1 Comparison of results of different additive ratios As shown in Table 1, 4:1:2 is the optimal ratio of the present application, which can effectively solve the technical problem of too many pores on the surface of the nickel electrowinning.

Claims

1. An apparatus for the inhibition of porosity in sulphated electrowinning of nickel comprising a stirred tank (6) characterised in that: The upper end of the stirring box (6) is connected with a vertical stirring device (5); the stirring box (6) is connected with three kinds of additive containers respectively through a quantitative pump (1), the additive containers include: a type of nickel electrodeposition pore inhibiting additive container (3), a type of nickel electrodeposition pore inhibiting additive container (4) and a sodium dodecyl sulfonate solid additive container (2); the outlet of the stirring box (6) is connected with a mortar pump (7), a precision filter (8) and a clarifying tank (9) in sequence.

2. The apparatus of claim 1, wherein: The vertical stirring device (5) includes a motor (10), a speed reducer (11), a shaft coupling (12), a rack (13), a stirring shaft (14) and a stirring paddle (15), the stirring shaft (14) is located in the stirring box (6), one end of the stirring shaft (14) is provided with the stirring paddle (15), one end of the stirring shaft (14) located outside the stirring box (6) is sleeved with the rack (13) fixed with the stirring box (6), the rack (13) is fixed with the speed reducer (11), the top of the speed reducer (11) is connected with the motor (10), the speed reducer (11) is connected with the exposed end of the stirring shaft (14) through the shaft coupling (12).

3. The apparatus of claim 1, wherein: The quantitative pump (1) is configured to pump the additives into the stirring box (6) according to the mass ratio of the type A additive: the type B additive: sodium dodecyl sulfonate = 4:1:

2.

4. The apparatus of claim 1, wherein: The precision filter (8) is configured to filter solid particles with a particle size of ≥1 μm.

5. The apparatus of claim 1, wherein: An electric heater is arranged in the stirring box (6) to maintain the temperature of the solution in the box at 80-100℃.

6. The apparatus of claim 1, wherein: The volume of the clarifying tank (9) is 4 m 3 .

7. A method for suppressing porosity in electrowinning of nickel sulfate, using the apparatus according to any one of claims 1 to 6, characterized in that, The method comprises the following steps: (a) pumping the type A additive, the type B additive and sodium dodecyl sulfonate with a mass ratio of 4:1:2 into the stirring box (6) through the quantitative pump (1); (b) adding water into the stirring box (6) and starting the stirring device (5) to stir at 80-100℃ until the solid additives are completely dissolved; (c) delivering the solution to the precision filter (8) through the mortar pump (7) for fine filtering; (d) guiding the filtrate into the clarifying tank (9) for subsequent treatment.

8. The method of claim 7, wherein: The additive single addition amount in step (a) is: 20 kg of the type A additive, 5 kg of the type B additive and 10 kg of sodium dodecyl sulfonate; the addition is repeated twice every 12 hours; the type A additive is the nickel electrodeposition pore inhibiting additive MF-DJ-901(A) produced by Mingfeng Chemical Industry Co., Ltd., and the type B additive is the nickel electrodeposition pore inhibiting additive MF-DJ-901(B) produced by Mingfeng Chemical Industry Co., Ltd.

9. The method of claim 7, wherein: The vertical stirring device (5) adopts an intermittent operation mode in step (b): stirring for 10 seconds every 40 minutes.

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