Cobalt sulfate heptahydrate production method

Abstract

The invention provides a cobalt sulfate heptahydrate production method. The method includes steps: (1) precursor preparation, to be more specific, adding an alkaline precipitator into pure cobalt sulfate solution, filtering and washing precipitates to obtain cobalt carbonate or cobalt hydroxide precursor, and returning precipitation mother liquor to a vitriol precipitation procedure in cobalt hydrometallurgy; (2) precursor acid dissolution, to be more specific, stirring and pulpifying the precursor with pure water or mother liquor in a dissolving tank, and adding concentrated sulfuric acid for acid dissolution, so that acid solution slurry is heated by reaction heat and dilution heat; (3) acid solution cooling and crystallization, to be more specific, stopping addition of concentrated sulfuric acid after dissolution is completed, cooling and crystallizing in a crystallization tank, cooling to the room temperature, subjecting crystal slurry to solid-liquid separation to obtain a cobalt sulfate heptahydrate product and crystallization mother liquor, and returning the mother liquor to the precursor pulpifying procedure. Steam consumption in evaporation and concentration in an existing cobalt sulfate evaporative crystallization production process is avoided, so that cost is sharply reduced while formation of water insoluble matters in an evaporation process is avoided. In addition, cobalt liquid precipitation and precursor dissolution equipment is simple, and investment cost is low and operations are simple as compared with those of an evaporation procedure.

Description

technical field [0001] The invention relates to the production technology of cobalt sulfate heptahydrate, in particular to the technology of cobalt sulfate solution producing cobalt sulfate heptahydrate through processes such as precipitation-acid dissolution-cooling and crystallization. Background technique [0002] The current cobalt sulfate heptahydrate is produced by the method of evaporation concentration-cooling crystallization of pure cobalt sulfate solution after extraction and purification. Traditional evaporation techniques include single-effect evaporation and multi-effect evaporation. [0003] CN104192917A patent titled "A Continuous Crystallization Process of Nickel-Cobalt Sulfate" discloses the method of MVR evaporation concentration-continuous crystallization, and crystallizes the cobalt sulfate solution after stripping through MVR evaporation concentration, which has low energy consumption compared with the traditional process , high degree of automation, e...

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Problems solved by technology

[0005] The problem solved by the present invention is to provide a new method for producing cobalt sulfate heptahydrate, to solve the shortcomings of high energy consumption, low product pH value and high oil content in the above background

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