A method for electrowinning nickel and iron from nickel sulfate-ferrous sulfate acidic mixed solution

Abstract

The invention relates to a method for recovering nickel and iron from a nickel sulfate-ferrous sulfate acidic mixed solution through electrodeposition and belongs to the technical field of the hydrometallurgy. Firstly, the nickel sulfate-ferrous sulfate acidic mixed solution containing 10-15 g / L of the nickel, 2-5 g / L of the iron and 10-30 g / L of sulfuric acid is evaporated and concentrated to contain 60-80 g / L of the nickel. Nickel carbonate or sodium carbonate is added to the evaporated and concentrated nickel sulfate-ferrous sulfate acidic mixed solution in air for adjusting pH to 3-3.5, and a nickel sulfate-ferrous sulfate acidic mixed electrolytic solution is obtained. The obtained nickel sulfate-ferrous sulfate acidic mixed electrolytic solution serves as an electrolyte, a titanium plate or a lead alloy plate serves as an electroconductive anode, and a stainless steel plate or a titanium plate serves as a cathode; sodium sulphate and sodium dodecyl sulfate are added to the electrolyte; electrodeposition is conducted for 70-80 h under conditions of the temperature of 50-65 DEG C, the electriccurrent density of 100-300 A / m2 and the interelectrode distance of 8-12 cm; and a nickel-iron alloy plate is obtained at the cathode. Compared with the traditional electrolytic nickel industry, according to the method, deferrization cost is lowered, and meanwhile the two elements of the nickel and iron are recovered; the recovery rate of the nickel is improved, and the waste of the iron is reduced.

Description

technical field [0001] The invention relates to a method for electrowinning nickel and iron from nickel sulfate-ferrous sulfate acidic mixed solution, belonging to the technical field of hydrometallurgy. Background technique [0002] Nickel is an important non-ferrous metal mineral resource, because of its good corrosion resistance, it is mainly used to manufacture stainless steel and other corrosion-resistant alloys, and is often used in the field of electroplating. It is also used as a hydrogenation catalyst and used in the preparation of ceramic products, special chemical containers, electronic circuits and nickel compounds. In recent years, my country has entered a stage of rapid industrialization, and the demand for nickel metal mineral resources has increased rapidly, which will undoubtedly affect the demand for nickel resources. Supply presents major challenges. [0003] my country's sulfide-type nickel ore resources are relatively rich, mainly distributed in 19 provi...

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Problems solved by technology

[0003] my country's sulfide-type nickel ore resources are relatively rich, mainly distributed in 19 provinces in the northwest, southwest and northeast. Compared with sulfide-type nickel ore resources, my country's laterite nickel ore resources are relatively scarce. At present, the national laterite nickel ore reserves only account for all nickel 9.6% of the ore resources, not only the reserves are relatively small, but also the grade of domestic laterite nickel ore is relatively low, and the mining cost is relatively high, which means that my country is not competitive in laterite nickel ore

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