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Method for producing battery-grade nickel sulfate by taking nickel oxide as raw material

A technology of nickel oxide and nickel sulfate, applied in nickel sulfate and other directions, can solve the problems of equipment corrosion, high raw material cost, large consumption of fluoride salt, etc., and achieve the effects of low cost, resource saving and short extraction process.

Inactive Publication Date: 2019-01-29
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method of nickel sulfate is mainly chemical dissolution or electrochemical dissolution of nickel-containing raw materials, solution removal, evaporation, and crystallization to obtain nickel sulfate products. Calcium and magnesium in the solution are mainly removed by sodium fluoride chemical precipitation, and sodium fluoride precipitation The effect of removing calcium and magnesium by the method is good, but its disadvantages are that the addition of sodium fluoride introduces sodium ions into the system, which is difficult to remove in the subsequent process and affects the quality of nickel sulfate crystals. The consumption of fluoride salts is large, the price is relatively expensive, and the cost of raw materials High, and the introduction of fluoride ions will corrode on-site production equipment
[0003] The acidity in the treated solution of nickel oxide produced by spray pyrolysis using laterite ore as raw material is relatively high, and direct evaporation and crystallization will seriously corrode the on-site equipment. It is necessary to use alkaline substances to neutralize the excess acid in the nickel oxide treatment solution, which is generally used in industrial production. Nickel carbonate or nickel hydroxide, but the content of calcium, magnesium, and sodium in nickel carbonate or nickel hydroxide on the market is relatively high, which will directly cause the content of calcium, magnesium, and sodium in subsequent products to fail to meet the control standards

Method used

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  • Method for producing battery-grade nickel sulfate by taking nickel oxide as raw material
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  • Method for producing battery-grade nickel sulfate by taking nickel oxide as raw material

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Experimental program
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Effect test

Embodiment 1

[0047] 1. Nickel oxide dissolution

[0048] Nickel oxide is pretreated with sulfuric acid with a hydrogen ion concentration of 12mol / L, and the pretreated nickel oxide is obtained by solid-liquid separation. The pretreatment temperature is 90°C, the volume of sulfuric acid with a hydrogen ion concentration of 12mol / L is 2L, and nickel oxide is 0.5kg. The pretreated nickel oxide is dissolved in sulfuric acid with a hydrogen ion concentration of 5 mol / L, the volume of sulfuric acid with a hydrogen ion concentration of 5 mol / L is 2.35 L, nickel oxide is 0.47 kg, the reaction temperature is 90 ° C, the reaction time is 6 hours, and hydrogen is obtained by filtration Acid-containing nickel sulfate solution with 0.46mol / L ions and 133g / L nickel ions.

[0049] 2. Synthesis of nickel carbonate with low calcium, magnesium and sodium content

[0050] Use pure water to configure sodium carbonate solution 120g / L, nickel sulfate solution 60g / L, synthesis temperature 80°C, synthesis pH mai...

Embodiment 2

[0057] 1. Nickel oxide dissolution

[0058] The nickel oxide is pretreated with sulfuric acid with a hydrogen ion concentration of 10mol / L, and the pretreated nickel oxide is obtained by solid-liquid separation. The pretreatment temperature is 80°C, the volume of sulfuric acid with a hydrogen ion concentration of 10mol / L is 1.8L, and the nickel oxide is 0.6 kg; use sulfuric acid with a hydrogen ion concentration of 4.5mol / L to dissolve the pretreated nickel oxide, the volume of sulfuric acid with a hydrogen ion concentration of 4.5mol / L is 2.2L, nickel oxide is 0.56kg, the reaction temperature is 80°C, and the reaction time is 8 hours. Filtrate to obtain the acid-containing nickel sulfate solution with hydrogen ion 0.43mol / L and nickel ion content 119g / L.

[0059] 2. Synthesis of nickel carbonate with low calcium, magnesium and sodium content

[0060] Use pure water to configure sodium carbonate solution 100g / L, nickel sulfate solution 50g / L, synthesis temperature 70°C, synth...

Embodiment 3

[0067] 1. Nickel oxide dissolution

[0068] Nickel oxide is pretreated with sulfuric acid with a hydrogen ion concentration of 8 mol / L, and the pretreated nickel oxide is obtained by solid-liquid separation. The pretreatment temperature is 70°C, the volume of sulfuric acid with a hydrogen ion concentration of 10 mol / L is 0.5 L, and the nickel oxide is 0.5 kg, using sulfuric acid with a hydrogen ion concentration of 3.5mol / L to dissolve the pretreated nickel oxide, the solid ratio is 3:1 (2.7L of nickel-containing sulfuric acid, 0.45kg of pretreated nickel oxide, 0.45kg of nickel oxide dissolved slag, of which nickel oxide The dissolved slag was obtained from the last filtering reaction and was reused), the reaction temperature was 70° C., the reaction time was 8 hours, and the acid-containing nickel sulfate solution of hydrogen ion 0.32mol / L and nickel ion content 93.32g / L was obtained by filtration.

[0069] 2. Synthesis of nickel carbonate with low calcium, magnesium and sod...

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Abstract

The invention discloses a method for producing battery-grade nickel sulfate by taking nickel oxide as a raw material. The method is characterized by comprising the following steps: (1) pretreating nickel oxide by using sulfuric acid with a hydrogen ion concentration of 8-12 mol / L, carrying out solid-liquid separation, carrying out solid-liquid separation by using sulfuric acid with a hydrogen ionconcentration of 3-6 mol / L to obtain a solid, filtering the obtained solution to obtain a filtrate; and (2) neutralizing the filtrate obtained in the step (1) by using nickel carbonate, evaporating the obtained solution, and carrying out crystallization and drying to obtain the battery-grade nickel sulfate product. According to the method, the dissolution rate of nickel oxide is increased by aboutone time, purification and impurity removal are not needed, and a nickel sulfate product can be produced by directly carrying out evaporative crystallization. A crystallization mother liquid can be repeatedly used, resources are saved, the extraction process is short, and cost is low.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a method for producing battery-grade nickel sulfate by using nickel oxide as a raw material. Background technique [0002] The raw materials for industrial production of nickel sulfate are mainly metallic nickel, nickel carbonyl, nickel sulfide ore, laterite nickel ore, crude nickel sulfate, electroplating sludge and crude nickel hydroxide. The preparation method of nickel sulfate is mainly chemical dissolution or electrochemical dissolution of nickel-containing raw materials, solution removal, evaporation, and crystallization to obtain nickel sulfate products. Calcium and magnesium in the solution are mainly removed by sodium fluoride chemical precipitation, and sodium fluoride precipitation The effect of removing calcium and magnesium by the method is good, but its disadvantages are that the addition of sodium fluoride introduces sodium ions into the system,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/10
Inventor 赵德周佑明麻在生董存武明键伟沈艳玲杜金龙徐文兵魏焘
Owner JINCHUAN GROUP LIMITED
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