Cobalt sulfate heptahydrate production method

A cobalt sulfate, acid-soluble technology, applied in cobalt sulfate and other directions, can solve the problems of high energy consumption, high oil content, low product pH value, etc., and achieve the effects of low energy consumption, low product oil content, and fewer processes

Active Publication Date: 2017-06-13
QINGYUAN JIAZHI NEW MATERIAL RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Cobalt sulfate heptahydrate production method
  • Cobalt sulfate heptahydrate production method

Examples

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Embodiment 1

[0022] After hydrocobalt ore is leached with sulfuric acid, extracted to collect copper, precipitated alum to remove iron, P204 to remove impurities, and P507 to extract and back-extract, pure Co 2+ 120g / L cobalt sulfate solution. Add Na to pure cobalt sulfate solution 2 CO 3 For precipitation, the precipitated slurry is separated and washed by a filter press, and the precipitated mother liquor and washing water are returned to the alum sinking process of cobalt hydrometallurgy. CoCO 3 Transfer the precipitate to the dissolution tank, stir and slurry with pure water and mother liquor, and then quickly add 98% concentrated sulfuric acid for acid dissolution. The heat of reaction and dilution heat up the temperature of the acid-dissolved slurry to 106 ºC, and the pH value of the solution reaches 4.5 Stop adding concentrated sulfuric acid. Transfer the acid solution into the crystallization tank and feed circulating water to cool the crystallization, control the flow rate of ...

Embodiment 2

[0024] After the laterite nickel ore is leached with sulfuric acid, iron is removed by sinking alum, impurity is removed by P204 extraction, and pure Co is obtained by P507 extraction. 2+ 120g / L cobalt sulfate solution. NaOH is added to the pure cobalt sulfate liquid for precipitation, the precipitated slurry is separated and washed by a filter press, and the precipitated mother liquor and washing water are returned to the alum sinking process of cobalt hydrometallurgy. Co(OH) 2 Transfer the precipitate to the dissolving tank, stir and slurry with pure water and mother liquor, then quickly add 98% concentrated sulfuric acid for acid dissolution, the heat of reaction and dilution heat up the temperature of the acid-dissolved slurry to 70 ºC, and the pH value of the acid solution reaches 1.5 Stop adding concentrated sulfuric acid. Transfer the acid solution into the crystallization tank and feed circulating water to cool the crystallization, control the flow of circulating wate...

Embodiment 3

[0026] Cobalt-containing sulfide ores are subjected to oxygen pressure leaching, alum sinking to remove iron, P204 extraction to remove impurities, and P507 extraction to obtain pure Co 2+ 120g / L cobalt sulfate solution. Add NH to pure cobalt sulfate solution 4 HCO 3 For precipitation, the precipitated slurry is separated and washed by a filter press, and the precipitated mother liquor and washing water are returned to the alum sinking process of cobalt hydrometallurgy. CoCO 3 Transfer the precipitate to the dissolving tank, stir and slurry with pure water and mother liquor, then quickly add 98% concentrated sulfuric acid for acid dissolution, the heat of reaction and dilution heat up the temperature of the acid-soluble slurry to 88 ºC, and the pH value of the acid solution reaches 3.0 Stop adding concentrated sulfuric acid. Transfer the acid solution into the crystallization tank and feed circulating water to cool the crystallization. Control the circulating water flow ra...

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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...

Claims

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Application Information

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IPC IPC(8): C01G51/10
CPCC01G51/10C01P2006/80
Inventor 付海阔李文津吴理觉柴志华
Owner QINGYUAN JIAZHI NEW MATERIAL RES INST CO LTD
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