Method for leaching cobalt from high-valued cobalt oxide-containing raw material

Abstract

A method for leaching cobalt from a high-valued cobalt oxide-containing raw material comprises the following steps: crushing the high-valued cobalt oxide-containing raw material; carrying out fine grinding to obtain particles smaller than or equal to 0.25 mm; mixing the particles with a carbonaceous reducing agent such as coal powder, coke powder or powdered carbon till the obtained mixture I is uniform; controlling the water content of the mixture I to be smaller than or equal to 20 percent; mixing the mixture I with a certain quantity of concentrated sulfuric acid under the condition that no water is added till the obtained mixed material is uniform; carrying out slaking at 100 to 300 DEG C; pulpifying the slaked material with water for leaching; finally carrying out solid-liquid separation to obtain cobalt-containing leachate; obtaining a cobalt product by treating the cobalt-containing leachate according to the conventional technology. The method has the advantages that the carbonaceous reducing agent which is low in price and easy to obtain is used for reduction at low temperature; the technological process and equipment are simple; the energy consumption is low; the cobalt leaching rate is high; the production cost is low.

Description

technical field [0001] The invention belongs to the field of cobalt mineral smelting, and in particular relates to a method for leaching cobalt from raw materials containing high-valent cobalt oxides by using a carbonaceous reducing agent through sulphating, reducing and ripening under low temperature conditions. Background technique [0002] Cobalt has excellent physical and chemical properties, and is an important raw material for superalloys, magnetic materials, chemical industry, electronics industry, etc. There are more than one hundred kinds of cobalt minerals that have been found in nature. Industrial cobalt-containing ores are divided into two categories: sulfide ores and oxide ores. Cobalt sulfide ores are generally produced by pyrometallurgy to produce various cobalt products, while cobalt oxide ores are expensive due to cobalt. Cobalt oxides, such as cobalt ore and hydrocobalt ore, are usually treated by reducing acid leaching in addition to pyrometallurgical coba...

AI Technical Summary

Problems solved by technology

[0004] Because the traditional wet smelting process containing high-priced cobalt oxide raw materials needs to add a large amount of sodium sulfite, sulfur dioxide, hydrogen peroxide, etc. as reducing agents, the consumption of reducing agents is large and the price is high, resulting in high production costs and inconvenient sources of reducing agents

CN103882226A discloses an economical, clean and easy method for leaching cobalt from high-valent cobalt oxides, using simple carbon as a reducing agent and sulfuric acid as a leaching agent for reduction leaching, and using cheap and easy-to-get carbon to replace sulfur dioxide and other reducing agents, reducing It reduces the production cost and simplifies the process, but this method is to first adjust the high-valent cobalt oxide with water to make a slurry with a mass concentration of cobalt oxide ore of 20% to 50%, and then add concentrated sulfuric acid at a dry basis of 150 to 500kg / t for leaching , due to the reaction in an acidic aqueous solution, the concentration of sulfuric acid in the pulp is low, and the redox reaction activity of carbon and sulfuric acid is poor. The amount of added carbon needs to account for more than 20% of the ore mass to achieve the effect of cobalt leaching rate of 88%. The carbon added is The theoretical amount of carbon required for the reduction of cobalt, manganese, iron, etc. in cobalt raw materials is more than 20 times, resulting in excessive consumption of a large amount of carbon, high cost, and a large amount of unreacted carbon left in the leaching slag, which requires further treatment and complicated process

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