阅读说明：本技术 一种提高纯硫酸盐体系下电积镍物理外观质量的方法 (Method for improving physical appearance quality of electrodeposited nickel in pure sulfate system ) 是由 张晗 刘玉强 陈彩霞 席海龙 王书友 李全 朱锐伦 张建玲 王钦 马天飞 高晓婷 于 2020-05-27 设计创作，主要内容包括：本发明的一种提高纯硫酸盐体系下电积镍物理外观质量的方法,包括以下步骤：步骤(1)：配制Ni含量为50g/L-80g/L、SO<Sub>4</Sub><Sup>2-</Sup>含量为80g/L-130g/L的电积新液,电积新液的pH为3.5-4.5；步骤(2)：在步骤(1)的电积新液中加入硝酸盐添加剂,得到混合溶液,混合溶液中NO<Sub>3</Sub><Sup>-</Sup>含量为0.1g/L-0.3g/L；步骤(3)：将步骤(2)的混合溶液通入电积槽内电积,得到电积镍；电积的工艺条件为：电积温度为65℃-75℃、电流密度为150A/m<Sup>2</Sup>-250A/m<Sup>2</Sup>。本发明可有效减少电积镍表面气孔,通过本发明方法制备的电积镍具有明显的金属光泽、品级率达到90％-96％。(The invention relates to a method for improving the physical appearance quality of electrodeposited nickel in a pure sulfate system, which comprises the following steps: step (1): the Ni content is 50g/L-80g/L, SO 4 2‑ The new electro-deposition solution with the content of 80g/L to 130g/L and the pH value of 3.5 to 4.5; step (2): adding a nitrate additive into the novel electrodeposition solution obtained in the step (1) to obtain a mixed solution, wherein NO is contained in the mixed solution 3 ‑ The content is 0.1g/L-0.3 g/L; and (3): introducing the mixed solution obtained in the step (2) into an electrodeposition tank for electrodeposition to obtain electrodeposited nickel; the process conditions of electrodeposition are as follows: the electrodeposition temperature is 65-75 ℃, and the current density is 150A/m 2 ‑250A/m 2 . The invention can effectively reduce the pores on the surface of the electrodeposited nickel, and the electrodeposited nickel prepared by the method has obvious metal luster and the grade rate of 90-96 percent.)

1. A method for improving the physical appearance quality of electrodeposited nickel in a pure sulfate system is characterized by comprising the following steps:

step (1): the Ni content is 50g/L-80g/L, SO₄ ^2-The new electro-deposition solution with the content of 80g/L to 130g/L and the pH value of 3.5 to 4.5;

step (2): adding a nitrate additive into the novel electrodeposition solution obtained in the step (1) to obtain a mixed solution, wherein NO is contained in the mixed solution₃ ^-The content is 0.1g/L-0.3 g/L;

and (3): introducing the mixed solution obtained in the step (2) into an electrodeposition tank for electrodeposition to obtain electrodeposited nickel; the process conditions of electrodeposition are as follows: the electrodeposition temperature is 65-75 ℃, and the current density is 150A/m²-250A/m²。

2. The method for improving the physical appearance quality of electrodeposited nickel under a pure sulfate system as claimed in claim 1, wherein the grade rate of electrodeposited nickel obtained in the step (3) is 90-96%.

3. The method for improving the physical appearance quality of electrodeposited nickel under a pure sulfate system as claimed in claim 1, wherein the nitrate additive in step (2) is one or both of nickel nitrate and sodium nitrate.

Technical Field

The method relates to the technical field of nickel and cobalt hydrometallurgy processes, in particular to a method for improving the physical appearance quality of electrodeposited nickel in a pure sulfate system.

Background

Compared with electrolytic nickel of a mixed acid system and electrolytic nickel of a foreign pure chlorination system, the electrodeposited nickel product under a domestic traditional pure sulfate system has obvious difference in physical appearance quality, and is mainly characterized in that the surface of the electrodeposited nickel is whitened and has no metallic luster; in the process of producing electrodeposited nickel in a pure sulfate system, if the pH value of the new solution is slightly lower, hydrogen ions are discharged at the cathode, so that more pores on the surface of the electrodeposited nickel are caused, and the quality of the electrodeposited nickel produced by the pure sulfate system is influenced.

In the process of the nickel electrodeposition industrial production under the traditional pure sulfate system, additives such as sodium dodecyl sulfate and the like are added, but the physical appearance quality of the nickel electrodeposition product under the system cannot be obviously improved, and the surface of the nickel electrodeposition is always whitened and has no metallic luster. Meanwhile, in order to control hydrogen ions to generate hydrogen when the cathode discharges so as to cause the surface of the nickel to generate air holes, the traditional process adds a buffering agent such as boric acid and the like into the new liquid, controls the pH value of the new liquid within a certain range and inhibits the generation of hydrogen holes. In actual production, however, the physical appearance is affected due to many pores on the surface of the nickel electrode caused by improper control of the acidity of the solution, and the like, and production data shows that the grade rate of the nickel electrode product produced by the insoluble anode of the pure sulfate system is more than 85%.

Disclosure of Invention

Aiming at the problems of more pores, poor metallic luster and the like in the production of electrodeposited nickel of a pure sulfate system in the prior art, the invention provides a method for improving the physical appearance quality of electrodeposited nickel under the pure sulfate system, and the grade rate of the electrodeposited nickel product produced under the pure sulfate system can reach 90-96 percent by the method. The method has low cost and no discharge of waste water, waste residue and waste gas, and is a novel process method for green and high-efficiency improvement of the physical appearance quality of the electrodeposited nickel surface in a pure sulfate system.

The invention is realized by the following technical scheme:

a method for improving the physical appearance quality of electrodeposited nickel in a pure sulfate system is characterized by comprising the following steps:

step (1): the Ni content is 50g/L-80g/L, SO₄ ^2-The new electro-deposition solution with the content of 80g/L to 130g/L and the pH value of 3.5 to 4.5;

step (2): adding a nitrate additive into the novel electrodeposition solution obtained in the step (1) to obtain a mixed solution, wherein NO is contained in the mixed solution₃ ^-The content is 0.1g/L-0.3 g/L;

and (3): introducing the mixed solution obtained in the step (2) into an electrodeposition tank for electrodeposition to obtain electrodeposited nickel; the process conditions of electrodeposition are as follows: the electrodeposition temperature is 65-75 ℃, and the current density is 150A/m²-250A/m²。

The method for improving the physical appearance quality of the electrodeposited nickel in the pure sulfate system is characterized in that the grade rate of the electrodeposited nickel obtained in the step (3) is 90-96%.

The method for improving the physical appearance quality of the electrodeposited nickel in the pure sulfate system is characterized in that the nitrate additive in the step (2) is one or two of nickel nitrate and sodium nitrate.

The invention has the beneficial technical effects that: in the invention, nitrate is added to the pure sulfate system, namely the process for producing the electrolytic nickel by insoluble anode electrodeposition of the nickel sulfate solution, so that the content of nitrate radical in the new electrodeposition solution and the pH value of the solution are controlled. The nitrate is added without introducing new impurities into the electro-deposition liquid, the added nitrate enters the cathode diaphragm bag along with the new liquid, and the nitrate discharges at the cathode in the process of generating electro-deposition nickel, so that the acidity of the cathode liquid is adjusted, the surface pores of the generated electro-deposition nickel can be effectively reduced, the electro-deposition nickel has obvious metal luster, and the grade rate of the electro-deposition nickel product is improved by 90-96%.

Drawings

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

Referring to fig. 1, the method for improving the physical appearance quality of electrodeposited nickel in a pure sulfate system comprises the following steps: step (1), preparing a new electrodeposition solution: the novel electro-deposition solution under the pure sulfate system has the chemical component requirements on the novel electro-deposition solution as follows: sulfate solution with Ni content of 50-80 g/L, SO₄ ^2-The content is 80g/L-130g/L, and specifically comprises the following components: the Ni content is 50g/L-80g/L, SO₄ ^2-The new electro-deposition solution with the content of 80g/L to 130g/L has the pH value of 3.5 to 4.5. Adding an additive in the step (2): adding a nitrate additive into the new electrodeposition solution obtained in the step (1) to obtain a mixed solution, wherein the nitrate can effectively reduce pores on the surface of electrodeposited nickel, so that the electrodeposited nickel has obvious metal luster, the physical appearance quality of the electrodeposited nickel is improved, and NO in the mixed solution₃ ^-The content is 0.1g/L-0.3 g/L; the nitrate additive is one or two of nickel nitrate and sodium nitrate, and the addition of the nitrate can not introduce new impurities into the electrolyte, thereby influencing the chemical quality of the electrolytic nickel. In the process of producing electrodeposited nickel under a pure sulfate system, the added nitrate enters a cathode diaphragm bag along with the new electrodeposited liquid, and part of nitrate discharges at the cathode in the process of generating electrodeposited nickel, so that the effect of regulating the acidity of the cathode liquid is achieved, the generated electrodeposited nickel pores can be reduced, the metal luster is improved, and the grade rate of the electrodeposited nickel product is improved.Step (3) diaphragm electrodeposition; introducing the mixed solution obtained in the step (2) into an electrodeposition tank for electrodeposition to obtain electrodeposited nickel; the process conditions of electrodeposition are as follows: the electrodeposition temperature is 65-75 ℃, and the current density is 150A/m²-250A/m². The obtained electrodeposited nickel has few pores, obvious metal luster and grade rate of 90-96%.