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A kind of production method of cobalt sulfate heptahydrate

A production method and technology of cobalt sulfate, applied in the direction of cobalt sulfate, etc., can solve the problems of high personnel quality requirements, low primary crystallization rate, and low degree of automation.

Active Publication Date: 2017-03-22
GUANGDONG JIANA ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional technology has the following disadvantages: (1) Evaporation and concentration consumes a lot of energy; (2) The crystallized product has fine particles; (3) Low degree of automation and low production efficiency
[0004] CN 104192917 A discloses a method for continuous crystallization of cobalt sulfate. The cobalt sulfate solution after stripping is evaporated and concentrated by MVR and then crystallized by an improved cooling type internal circulation continuous crystallizer. Compared with traditional processes, it has low energy consumption, uniform particles, and automatic crystallization. It has the advantages of high degree, but there are shortcomings such as high equipment investment, many process control parameters, complicated technical operation, and high quality requirements for personnel. At the same time, it cannot solve the following shortcomings in the traditional evaporation crystallization process: (1) The primary crystallization rate is low, and the mother liquor needs to be returned. Re-evaporation, high energy consumption; (2) The process of forming water-insoluble substances in the evaporation and concentration process is not avoided, and the water-insoluble substances are high; (3) The free acid in the stock solution accumulates in the mother liquor, and the pH value of the product evaporated from the mother liquor is low.

Method used

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  • A kind of production method of cobalt sulfate heptahydrate
  • A kind of production method of cobalt sulfate heptahydrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Use Co 130g / L cobalt sulfate evaporative crystallization mother liquor as cobalt liquid (air temperature is 20ºC), pump cobalt sulfate solution into the crystallization tank, start stirring, without heating or cooling, and then pump ethanol as eluent; monitor at any time Co in mother liquor 2+ When the concentration of Co in the mother liquor reaches 0.5g / L, stop adding ethanol, and use a centrifuge to separate the solid and liquid after stirring and aging for 0.5 h; The sieved material is packaged and sold, and the obtained mother liquor is distilled; the distilled liquid is returned to the crystallization process as a dissolving agent, and the raffinate is returned to the leaching workshop of the cobalt hydrometallurgy for pulping the ore pulp. See the specific process figure 1 ..

[0030] The crystallization rate of this elution crystallization is 99.9%, the obtained cobalt sulfate product +24 mesh accounts for 95%, the product water insoluble matter is <0.0005%, a...

Embodiment 2

[0032] The water cobalt ore leaching solution is extracted by P204 to remove impurities, P507 is separated from nickel and cobalt, and then back-extracted to obtain a cobalt sulfate solution of Co 120g / L (air temperature is 40ºC). Start stirring, pump in isopropanol as a solvent, and add to saturation , the undersize is returned to the crystallization tank as a crystal seed, and isopropanol is continued to be pumped in; the Co in the mother liquor is monitored at any time. 2+ concentration, when the Co concentration in the mother liquor is 5g / L, stop adding benzene, and use a centrifuge to separate the solid and liquid after stirring and aging for 2 hours; The sieve is packaged and sold, and the resulting mother liquor is distilled; the distilled liquid is returned to the crystallization process as a dissolving agent, and the raffinate is returned to the cobalt hydrometallurgy extraction workshop for P507 extraction and recovery of Co. The specific process is only in the figu...

Embodiment 3

[0035] The water cobalt ore leaching solution is extracted by P204 to remove impurities, P507 is separated from nickel and cobalt, and back-extracted to obtain a Co 60g / L cobalt sulfate solution, which is frozen to 0ºC and pumped into the crystallization tank, started stirring, and then pumped into tetrahydrofuran as a solvent; monitor the mother liquor at any time Middle Co 2+ Concentration, when the Co concentration in the mother liquor reaches 10 g / L, stop adding isopropanol, use a centrifuge to separate the solid and liquid after stirring and aging for 1 hour; the obtained solid is directly packaged and sold after drying, and the obtained mother liquor is distilled after sulfide precipitation; the distilled The slip liquid is returned to the crystallization process as a dissolving agent, and the residual liquid is discharged outside. See the specific process figure 2 ..

[0036] The crystallization rate of this eluted crystal is 80.0%, the water insoluble matter of the ...

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Abstract

The invention discloses a production method for cobaltous sulfate heptahydrate. The production method includes the following steps that 1, a solvating-out agent is added to a crystallization tank containing a cobaltous sulfate solution, cobaltous sulfate is subjected to solvent-out crystallization, and the separated crystal nucleates and grows; 2, when the concentration of cobalt in the cobaltous sulfate solution in the crystallization tank is smaller than 10 g / L, the solvating-out agent is stopped being added, and solid-liquid separation is conducted; 3, obtained solids are dried and screened, screen underflow serves as seed crystals, and screen overflow is cobaltous sulfate heptahydrate; 4, the cobaltous sulfate solution in the crystallization tank is distilled, distillate serves as the solvating-out agent to be returned to the crystallization step, and raffinate is returned to a wet smelting workshop. The primary crystallization rate of the method reaches up to 99.6% or above, the produced cobaltous sulfate heptahydrate product is large in particle and has glossiness, an evaporation and concentration procedure is not needed, steam consumption is reduced, formation of water insoluble matter in the evaporation and concentration procedure is avoided, and the water insoluble matter in the product is greatly reduced; acid and oil in cobalt liquor before crystallization are diluted by the solvating-out agent in mother liquor, and the product is high in pH and low in oil content; the distillation recovery rate of the solvating-out agent is larger than 98%, and the solvating-out agent can be recycled after being distilled.

Description

technical field [0001] The invention relates to a production method of cobalt sulfate heptahydrate, in particular to a method for producing cobalt sulfate heptahydrate by dissolution and crystallization of a low boiling point solvent. [0002] technical background [0003] The current cobalt sulfate heptahydrate is produced by the method of evaporation concentration-cooling crystallization. The traditional evaporation technology includes single-effect evaporation and multi-effect evaporation, and the crystallization is a single-tank intermittent operation. The traditional technology has the following disadvantages: (1) Evaporation and concentration consumes a lot of energy; (2) The crystallized product has fine particles; (3) The degree of automation is low and the production efficiency is low. [0004] CN 104192917 A discloses a method for continuous crystallization of cobalt sulfate. The cobalt sulfate solution after stripping is evaporated and concentrated by MVR and then ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/10
CPCC01G51/10
Inventor 付海阔钟晖张鞍梁卫春陈亮
Owner GUANGDONG JIANA ENERGY TECH CO LTD