Method for processing cobalt precipitating solution

Abstract

The invention discloses a method for processing a cobalt precipitating solution. The method comprises the steps that (1) mixing and depositing of the cobalt precipitating solution and lime milk are carried out to conveniently obtain a liquid-solid mixture; (2) dense treatment is carried out on the liquid-solid mixture to obtain overflow containing cobalt hydroxide precipitation and underflow containing calcium sulfate; and (3) the overflow containing the cobalt hydroxide precipitation is filtered to obtain cobalt hydroxide and filtrate. By means of the method, the lime milk is used as a precipitating agent, an existing cobalt precipitation process is simplified, compared with an existing cobalt precipitation technology, the production cost for per ton of cobalt can be saved by not less than 2,000 yuan, meanwhile, the direct yield of cobalt can reach 96%, the effect is remarkable, large flow processing can be achieved, and the method is suitable for industrial production application.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, in particular, the invention relates to a method for treating cobalt precipitation solution. Background technique [0002] For low-grade cobalt ores in Indonesia and the Philippines, the mainstream treatment process is to prepare cobalt hydroxide after wet leaching. In the process of preparing cobalt hydroxide, the precipitants used are mainly magnesium oxide and sodium hydroxide. The cost of such precipitants High, and long-term operation of sodium and magnesium will accumulate, which will affect the system, resulting in the need to further use lime to precipitate magnesium or evaporate sodium, resulting in long process and high cost. Specifically, for example, sodium hydroxide is used as a precipitating agent to react with cobalt sulfate solution to prepare cobalt hydroxide products, and a flocculant is added to improve the settling performance of cobalt hydroxide, and cobalt hydroxide ...

AI Technical Summary

Problems solved by technology

In this process, using sodium hydroxide as a precipitant to precipitate cobalt will lead to high sodium content in the system, and long-term operation will affect the system. Therefore, evaporation and sodium removal are required, and the price of sodium hydroxide precipitant is high. At the same time, flocculants need to be added for subsequent concentration. , leading to high operating costs

Other separation methods, such as cyclone separation, are limited by the separation principle and equipment structure, and cannot handle large flows, so their applications are limited

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