A method for preparing electro-deposited cobalt under a large flow rate

Abstract

The invention discloses a method for preparing electrodeposited cobalt under a large flow. In conventional production methods for electrodeposited cobalt, the process of processing has the disadvantages of low current efficiency and long electrodeposition time, and purity and a recovery rate of produced electrodeposited cobalt hardly reach requirements. A technical scheme employed in the invention is as follows: a deoiled cobalt chloride solution produced in wet metallurgy is used as a raw material and is diluted with pure water so as to allow the concentration of Co<2+> in the cobalt chloride solution to be 30 to 100 g / L, and the diluted cobalt chloride solution is used as electrodeposition pre-liquid; and electrodeposition is carried out on the electrodeposition pre-liquid in an enclosed electrodeposition apparatus under the conditions of a large flow of 5 to 15 m<3> / h.m<2> and a negative pressure. According to the invention, the large flow is employed in the process of preparation of electrodeposited cobalt, so cathodic polarization is reduced, high current efficiency as high as more than 95% is obtained, and direct current consumption is low; utilization of the large flow enables chlorine and oxygen generated by an anode to be taken away in time, and oxidation of the cathode cobalt by chlorine and oxygen is prevented, thereby guaranteeing product quality.

Description

technical field [0001] The invention relates to the preparation of electro-deposited cobalt, in particular to a method for preparing electro-deposited cobalt under large flow. Background technique [0002] Cobalt has excellent properties such as corrosion resistance, high melting point, and strong magnetism. It is an important raw material for various special steels, heat-resistant alloys, corrosion-resistant alloys, and magnetic alloys. It is widely used in aerospace, machinery manufacturing, and batteries. Cobalt with high purity is widely used in magnetic materials and super alloy materials; cobalt with a purity of more than 99.999% can be used as a target for advanced electronic components. [0003] The production method of cobalt generally adopts the method of electrowinning, which is obtained by electrowinning cobalt sulfate or cobalt chloride solution. Taking cobalt chloride solution as an example, the reaction principle in the electrowinning process is as follows: ...

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Problems solved by technology

[0009] In the existing electrolytic cobalt production method, the current efficiency is not high in the processing process, the electrolytic deposition time is long, and the produced electrolytic cobalt is difficult to meet the requirements in terms of purity and recovery rate. Specifically, there are the following problems:

[0010] 1. In the electrowinning process, there is concentration polarization, and the current efficiency is very low. Traditional electrolysis is generally 60%~80%

[0011] 2. The electrolysis current of the traditional electrolysis process is small, generally 200~300A / m 2 , the electrodeposition time is longer

[0012] 3. Chlorine gas and hypochlorous acid produced by the reaction of a small amount of oxygen and water after the oxidation reaction of the anode discharge will oxidize the cathode cobalt, making the electrodeposited cobalt product contain oxygen and other impurities, reducing the purity of cobalt

[0013] 4. Adopt an open and open electrolytic cell. The cobalt solution in the electrolytic cell is directly exposed to the air. During operation, copper filings, iron filings and dust on the conductive rod will pollute the electrolytic solution at any time, resulting in poor quality of electrolytic cobalt products. Assure

[0014] 5. In the traditional method, in order to meet the requirements, additives such as boric acid and sodium saccharin must be added to ensure the quality of the product, which may cause secondary pollution to the subsequent treatment process of the electrowinning solution

[0015] 6. In the traditional electrowinning method, the processing range of the solution is above 60~100g / l, and it is difficult to process below 60g / l

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