Environment-friendly process unit and process for continuous stable production of electrolytic nickel or electrolytic cobalt

Abstract

The invention relates to electrolytic deposition equipment in the technical field of chemical engineering, belongs to the technical field of environmental protection, and specifically provides an environment-friendly process unit and a process for continuous stable production of electrolytic nickel or electrolytic cobalt. In the unit, a cathode frame and an anode frame are both arranged in an electrodeposition cell; a penetration membrane is arranged between the cathode frame and the anode frame; the cathode frame and the anode frame are both in an enclosed structure, and are respectively connected by screws; an electrolyte inlet is arranged on the cathode frame; an acid mist absorption port arranged on the anode frame is connected to an acid mist recovery system; an anode liquid outlet arranged at the lower end of the anode frame is connected to a circulatory system; the cathode in the cathode frame and the anode in the anode frame have a pole pitch of 70-130 mm. The unit and the process for production of electrolytic nickel or electrolytic cobalt provided by the invention can prolong usage life of workshop and equipment, well improve the environment, realize electrolysis of the electrolyte at constant speed, and guarantee quality of electrolytic nickel.

Description

technical field [0001] The invention relates to auxiliary equipment for electrolytic deposition equipment in the technical field of chemical industry, belongs to the technical field of environmental protection, and specifically relates to an environment-friendly electrolytic nickel or electrolytic cobalt continuous and stable production process device and process. [0002] Background technique [0003] The relatively advanced nickel production method in China is to produce metal nickel by refining hydrometallurgy process. During the production process, according to the chemical properties of nickel, it is easy to be polluted by other metals with similar potential or higher potential. Diaphragm electrolytic structure is used. The diaphragm bag 3 divides the electrolyte solution into the cathode area 1 and the anode area 2, and supplies the electrolyte solution to the cathode area (in the diaphragm bag) through the catholyte high level tank by self-flowing, ensuring that the ...

AI Technical Summary

Problems solved by technology

[0004] However, in the actual production process, the size of the distance between the cathode and the anode directly affects the quality of the electro-nickel in the electrolysis process. Nickel production efficiency is low, the pole spacing is too small, and the cathode plate is prone to sticking to the diaphragm bag and piercing the diaphragm bag during the production process, resulting in uneven surface of the electro-nickel plate, pores and other problems, reducing the quality of electro-nickel

[0005] has been recorded in the patent No. CN 201801606 U. In theory, adding electrolyte to the cathode area through the self-flowing liquid supply method of the elevated tank can effectively ensure that the cathode and anode However, through actual production, it is found that the original solution flows into the main liquid supply pipe through the high level tank, and is directly connected to the liquid distribution pipe of the electrolyte through a PVC hose. Irregularities lead to different height differences between the high level tank and the liquid distribution pipe, uneven liquid supply flow, low liquid supply electrolytic cells, nickel ions are easy to deplete, and a large amount of basic nickel is formed during the electrowinning process, resulting in nickel plate The surface of the plate turns green and black, which reduces the quality of electrolytic nickel. The electrolytic cell with too fast liquid supply, high nickel ion content and high viscosity of the solution makes it difficult for the hydrogen gas to escape from the plate surface, resulting in pores on the plate surface

And the flow rate is too large also causes the waste of catholyte

[0006]In traditional nickel or cobalt electrodeposition devices, oxygen and hydrogen ions are generated due to the loss of electrons at the anode H2O, Oxygen escapes, hydrogen ions are gradually enriched, and nickel ions in the solution get electrons on the cathode, and electrolytic nickel is precipitated. During the process of electrolytic nickel or cobalt deposition, hydrogen ions in the anode area are enriched. This process is During the acid-making reaction process, the oxygen and steam generated by the anode overflow from the liquid, and the surface of the bubbles will bring a small amount of acid into the air under the action of tension to form acid mist, so that the generated acid mist is directly discharged into the operating space without organization, seriously Affected the production environment

At the same time, it is very corrosive to steel structure workshops and equipment, which reduces the service life of workshops and equipment, and also affects the health of workers.

[0007] At present, there are also acid mist recovery devices developed, such as the nickel electrodeposition acid mist absorption device used in the application number 200720187328.4, which uses a gas collecting hood The acid mist is always extracted. In this case, it is necessary to install a gas collecting hood on the upper end of each anode. In addition, it is necessary to add an exhaust pipe to discharge the acid mist. In this way, first of all, during the electrolysis process, both the cathode and the anode will release Out of the gas, some acid will be brought out, and the acid mist will form water mist in the cover, and then the formed water droplets will drip onto the copper bars or copper rods in the electrolysis device, which will corrode copper and affect the quality of nickel products. Moreover, adding a gas collecting hood to the anode makes it difficult for maintenance personnel to enter the inside for maintenance, and it is necessary to lift the cover before operating, which will definitely increase labor intensity

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