An economical and clean method for leaching cobalt from high-valent cobalt oxides

Abstract

The invention discloses an economical, clean, simple and convenient method for leaching cobalt from high-valence cobalt oxides, and relates to a technology of leaching cobalt from cobalt oxide ores such as asbolite. According to the method disclosed by the invention, a carbon elementary-substance cobalt leaching agent without environmental pollution, which is not used yet at home and abroad, is used by aiming at shortages existing in the prior art, the cobalt leaching agent is low in price, material-saving, ubiquitous, and capable of leaching the high-valence cobalt oxides until the cobalt content of slag is about 0.02% in case of being simply poured in a leaching tank, and the cobalt leaching rate achieves 98%. During the leaching process, gases harmful to environment, such as SO2 and Cl2 are not generated, and the technical process is simplified, so that the method is an economical, clean, simple and convenient method for leaching cobalt from high-valence cobalt oxides.

Description

technical field [0001] The invention belongs to the technical field of cobalt metallurgy, and in particular relates to an economical, clean and convenient method for leaching cobalt from high-valent cobalt oxides. Background technique [0002] High-valent cobalt oxides, such as CoSO 4 Cobalt-containing manganese slag, NiSO 4 Cobalt chloride slag, cobalt ore, etc. obtained from liquid purification. When leaching these raw materials, it is necessary to add a reducing agent for leaching. The leaching agents used in industry are hydrochloric acid, SO 2 Wait. [0003] Leach Co(OH) with hydrochloric acid 3 When leaching cobalt slag with hydrochloric acid, a small amount of Cl is produced 2 , so attention should be paid to Cl 2 It pollutes the air in the workshop, and currently has few industrial applications. [0004] SO 2 For reduction leaching, the ore needs to be ground to -100 mesh, the leaching temperature is controlled at 80-90°C, the liquid-solid ratio is about 4.5...

AI Technical Summary

Problems solved by technology

[0005] But SO 2 Reductive leaching requires liquid SO 2 After gasification, use an anti-corrosion gas pipe to lead into the bottom of the leaching tank, which is difficult to operate and the equipment is complicated and easy to corrode; at the same time, the leaching solution is saturated with SO 2 Excessive gas overflow, causing adverse effects on the factory and surrounding environment

In addition, taking the processing of 1 ton of Congo cobalt ore with a cobalt grade of about 10% as an example, it consumes about 0.5 tons of SO 2 , industrial grade SO 2 The price is about 2,000 yuan / ton, and the consumption of artificial equipment adds about 1,000 yuan / ton to the cost of cobalt smelting.

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