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

A nickel-iron alloy and battery-level technology, which is applied in the preparation of nickel sulfate and nickel compounds, etc., can solve the problems of increased production costs, harsh working environment, and difficult disposal, and achieve the goal of reducing usage, reducing production costs, and improving recovery efficiency Effect

Pending Publication Date: 2021-11-09
MEISHAN SHUNYING POWER BATTERY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nitrogen oxides will be discharged during the process, and the working environment is harsh. At the same time, the waste water produced is mixed with nitrate ions, which is difficult to treat.
In addition, there is also a process for producing nickel sulfate by electrolysis. Although the utilization rate of nickel-iron alloy has been improved, this process is only applicable to areas with relatively low electricity prices, which has limitations, and needs to be continuously added to the electrolyte during the electrolysis process. Adding a large amount of concentrated sulfuric acid will not only cause environmental pollution, but also increase production costs

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] according to figure 1 The process flow chart shown, the detailed steps are as follows:

[0032] a. Add 500g of water to 1kg of nickel-iron alloy, then add sulfuric acid to make the sulfuric acid concentration 1.0mol / L, heat to 70°C under normal pressure and let it dissolve. + The reaction ends when the concentration is lower than 0.5mol / L;

[0033] B, filter the immersion solution obtained in step a, remove a small amount of slag and undissolved nickel-iron alloy;

[0034] c, the filtrate obtained in step b is adjusted to pH 2 with soda ash;

[0035] d. Stir the solution obtained in step c for 30 minutes, pour it into an autoclave, set the temperature at 110°C, oxygen pressure at 0.3MPa, and react for 2 hours;

[0036] e. The product obtained in step d is filtered, the filter residue is reduced and roasted, and the filtrate is used for circulation and standing for dissolution.

[0037] f. Carry out reduction roasting at 400° C. for the filter residue (i.e. iron remo...

Embodiment 2

[0040] according to figure 1 The process flow chart shown, the detailed steps are as follows:

[0041] a. Add 5000g of water to 1kg of nickel-iron alloy, then add sulfuric acid to make the sulfuric acid concentration 3.0mol / L, heat to 110°C under normal pressure and let it dissolve. + The reaction ends when the concentration is lower than 0.5mol / L;

[0042] B, filter the immersion solution obtained in step a, remove slag and ferronickel;

[0043] c, the filtrate obtained in step b is adjusted to pH 5 with soda ash;

[0044] d. Stir the solution obtained in step c for 30 minutes, pour it into an autoclave, set the temperature at 250°C, and the oxygen pressure at 0.8MPa, and react for 6 hours;

[0045] e. The product obtained in step d is filtered, the filter residue is reduced and roasted, and the filtrate is used for circulation and standing for dissolution.

[0046] f. Carry out reduction roasting at 700° C. for the filter residue (i.e. iron removal slag) obtained in step...

Embodiment 3

[0049] according to figure 1The process flow chart shown, the detailed steps are as follows:

[0050] a. Add 2500g of water to 1kg of nickel-iron alloy, then add sulfuric acid to make the sulfuric acid concentration 2.0mol / L, heat to 90°C under normal pressure and let it dissolve. + The reaction ends when the concentration is lower than 0.5mol / L;

[0051] B, filter the immersion solution obtained in step a, remove a small amount of slag and undissolved nickel-iron alloy;

[0052] c, adjusting the pH of the filtrate obtained in step b to 3.5 with soda ash;

[0053] d. Stir the solution obtained in step c for 30 minutes, pour it into an autoclave, set the temperature at 180°C, oxygen pressure at 0.55MPa, and react for 3.5 hours;

[0054] e. The product obtained in step d is filtered, the filter residue is reduced and roasted, and the filtrate is used for circulation and standing for dissolution.

[0055] f. Carry out reduction roasting at 550° C. for the filter residue obtai...

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Abstract

The invention discloses a method for producing battery-grade nickel sulfate by taking a ferro-nickel alloy as a raw material, and belongs to the technical field of metallurgy and chemical industry. The method comprises the following steps of: firstly, carrying out high-temperature static dissolution on ferro-nickel alloy to enable nickel and iron in the ferro-nickel alloy to react with dilute sulphuric acid to generate corresponding nickel sulfate and ferric sulfate which enter a solution, then filtering, adjusting the pH value of filtrate, then removing iron through high-temperature oxygen pressure, and taking rich iron oxide resources contained in filter residues after iron removal as raw materials for steelmaking; and circularly leaching the filtrate, enriching nickel sulfate, purifying and removing impurities after the content of nickel in the solution reaches a certain requirement, and extracting to produce battery-grade nickel sulfate. The method disclosed by the invention is simple in process, low in equipment requirement, low in production cost, green and environment-friendly, wide in application range of raw material ferro-nickel alloy components and capable of treating various ferro-nickel alloys with the nickel content of 10-90% and the iron content of 10-90%, and meanwhile, the produced nickel sulfate product is high in quality and can be directly used for preparing a battery material.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and chemical industry, and in particular relates to a method for producing battery-grade nickel sulfate by using nickel-iron alloy as raw material. Background technique [0002] Nickel-iron alloy has good corrosion resistance, high temperature resistance, rust resistance and other properties, and is widely used in steel fields such as stainless steel and alloy steel, and is used in automobile production, locomotive and machine manufacturing, etc. According to reports, about two-thirds of the world's nickel-iron alloys are used in the production of stainless steel. [0003] At present, the process route adopted by nickel-iron alloy to produce battery-grade nickel sulfate at home and abroad usually includes: adding vulcanizing agent to the nickel-iron alloy in the converter to convert the nickel-iron alloy into high nickel matte (wherein nickel exists in the form of nickel sulfide), and then succ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/10
CPCC01G53/10C01G53/003C01P2006/80
Inventor 何永但勇赵林金长浩赵澎宋世杰鲁维朱勇
Owner MEISHAN SHUNYING POWER BATTERY MATERIALS CO LTD
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