A method for preparing high-purity cobalt sulfate from electrolytic manganese sulfide slag

Abstract

The invention discloses a method for preparing high-purity cobalt sulfate from electrolytic manganese sulfide slag, which is carried out according to the following steps: (1) crushing and sieving; (2) oxidation leaching; (3) calcium removal; (4) manganese removal; 5) Synchronous extraction of cobalt and nickel; (6) Recovery of cobalt: take cobalt-nickel-rich organic phase, add dilute sulfuric acid for back extraction, and obtain cobalt-nickel sulfuric acid solution and neodecanoic acid organic phase; separate cobalt-nickel sulfuric acid solution, add saponification P507-Cyanex301 mixed with sulfonated kerosene to form the fourth organic extractant extraction, to obtain cobalt-rich organic phase and nickel sulfate solution; separate the cobalt-rich organic phase, add sulfuric acid for back extraction, to obtain high-purity rich cobalt sulfate solution and P507- Cyanex301 organic phase; (7) Preparation of high-purity cobalt sulfate. The invention has the advantages of being simple and feasible, realizing the leaching of cobalt sulfate, avoiding the generation of hydrogen sulfide gas, the use of iron-precipitating process and the method of fluoride ion precipitation for removing calcium and magnesium ions.

Description

technical field

[0001] The invention belongs to the fields of hydrometallurgy and clean metallurgy, and in particular relates to a method for preparing high-purity cobalt sulfate from electrolytic manganese sulfide slag. Background technique

[0002] Cobalt is an important industrial raw material. Electrolysis is a common method for producing manganese. The basic steps are: leaching manganese ore to obtain manganese-containing leachate, then neutralizing and removing iron, vulcanizing agent to remove heavy metals, and finally electrolyzing to obtain electrolytic manganese. In addition to heavy metals, a large amount of cobalt will also be precipitated in the form of cobalt sulfide, resulting in the loss of cobalt, so it is of great significance to recover the cobalt therein. At present, the treatment method of electrolytic manganese sulfide slag often adopts direct leaching with sulfuric acid, which is easy to generate toxic hydrogen sulfide gas. After leaching, the liquid i...

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