A process for comprehensively recovering valuable metals from cobalt-rich waste materials

Through the methods of sodium carbonate calcination and subsequent water-impregnation, acid leaching, hydrochloric acid regulation and reduction and precipitation, the problems of low leaching rate and low separation efficiency in cobalt-rich waste are solved, and efficient separation and recycling of metals such as cobalt, tungsten, chromium and other metals are achieved, which is suitable for industrial applications.

CN115725843BActive Publication Date: 2025-08-05NORIN MINING LTD
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Patent Information

Application Number
CN202211369601.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-11-03
Publication Date
2025-08-05
Estimated Expiration
2042-11-03

AI Technical Summary

Technical Problem

The existing processes are used for the leaching rate of cobalt-rich waste and the separation efficiency of cobalt from other metals, and pay less attention to the recycling of elements such as tungsten and chromium.

Method used

The cobalt silicate and cobalt ferrate in the conversion waste were pretreated by baking sodium carbonate to produce soluble sodium salts, and the cobalt, copper, tungsten, chromium and other elements were separated by water irrigation, sulfuric acid leaching and dilute hydrochloric acid regulation, and finally, the tungsten and chromium were separated by concentrated hydrochloric acid and sodium sulfite reduction precipitation.

Benefits of technology

It realizes efficient separation and recycling of metals such as cobalt, tungsten, chromium, etc., with high leaching rate, simple process, mild reaction conditions, and suitable for industrial applications.

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Abstract

The present invention relates to a process for comprehensively recovering valuable metals from cobalt-rich waste. Cobalt silicate in the waste is converted into sodium cobalt silicate through sodium carbonate roasting pretreatment, cobalt ferrite is converted into cobaltous oxide and ferric oxide, and composite oxides of tungsten, tantalum, and niobium are converted into soluble sodium salts such as sodium tungstate and sodium chromate. These are then separated from alkaline oxides such as cobaltous oxide in a subsequent water leaching process. Cobalt, iron, and copper in the water leaching residue are leached into a solution through sulfuric acid reduction leaching, while metals such as tantalum and niobium are contained in the acid leaching residue. Tungsten and chromium in the water leaching solution are separated by concentrated hydrochloric acid neutralization followed by tungsten precipitation followed by chromium reduction precipitation. This process has the advantages of a high elemental leaching rate and high separation efficiency of cobalt from elements such as tungsten and chromium. Furthermore, the process is simple, the reaction conditions are mild, and the raw materials used are inexpensive. It can achieve comprehensive recovery of elements such as cobalt, tungsten, and tantalum.
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