Method for producing battery-level refined nickel sulfate with electrolyte

A technology of nickel sulfate and electrolyte, applied in the direction of nickel sulfate, etc., can solve the problems of waste, large gap, and low price

Inactive Publication Date: 2011-05-04
中科铜都粉体新材料股份有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0014] As can be seen from the above, the crude product nickel sulfate quality index has a large gap with the standards of Canada International Nickel Corporation (INCO), HG/T2824-1997, and due to the limitation of technica

Method used

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Embodiment Construction

[0025] The present invention utilizes electrolyte to produce the method for battery-grade refined nickel sulfate, and it is characterized in that it comprises the following steps: (1) concentrated crystallization: electrolytic solution (containing nickel ≥ 1g / L) is put into reactor after nickel-containing decoppering, Steam is heated and concentrated. When the specific gravity is greater than 1.6, it is cooled for 6 hours to carry out natural precipitation and solid-liquid separation. The lower layer of paste is crude nickel sulfate;

[0026] (2) Oxidation and iron removal: dissolve the crude nickel sulfate in water, prepare a solution containing Ni80-100g / L, and a specific gravity of 1.16-1.26, add first-class hydrogen peroxide, heat at 80-90°C, and adjust the pH to 4- 5. React for 0.5-1 hour, cool and stand for more than 5 hours, suction filter the supernatant, the secondary filtrate contains Fe≤0.0015g / L;

[0027] (3) Removal of copper, lead and zinc by vulcanization: hydro...

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Abstract

The invention discloses a method for producing battery-level refined nickel sulfate with electrolyte. The method comprises the following steps: (1) concentrating and crystallizing: putting the nickel-containing electrolyte in which the copper is removed (nickel content is greater than or equal to 1 g/L) into a reaction kettle, steam-heating, concentrating and separating to obtain coarse nickel sulfate; (2) oxidizing to remove iron: dissolving the coarse nickel sulfate in water, and adding hydrogen peroxide; (3) vulcanizing to remove copper, lead and zinc: vulcanizing to remove copper, lead and zinc through the reaction of sodium sulfide and sulfuric acid; (4) concentrating to remove calcium and magnesium: removing calcium and magnesium by evaporation and concentration; (5) removing calcium and magnesium with sodium fluoride: under the action of mechanical stirring, adding second-grade sodium fluoride, and controlling the pH value with alkali liquid so that calcium and magnesium become fluoride precipitates to be removed; and (6) concentrating and crystallizing: concentrating the purified solution, and crystallizing to obtain the battery-level refined nickel sulfate. The product produced by the invention is an emerald granular crystal which is a square crystal, and the crystal grain diameter is greater than 2 mm and conforms to the HG/T2824-1997 standard.

Description

technical field [0001] The invention relates to a method for nickel sulfate, in particular to a method for producing battery-grade refined nickel sulfate by using electrolyte. Background technique [0002] The appearance of refined nickel sulfate is emerald green granular crystal, tetragonal crystal, relative density 2.07, and the commodity is mainly hexahydrate. Soluble in alcohol and ammonia. The aqueous solution is acidic and toxic. In the electroplating industry, it is used as the main raw material for electroplating nickel, electroless nickel plating, aluminum coloring and the production of other nickel salts such as nickel carbonate and nickel hydroxide. Printing and dyeing industry as a mordant. In the pharmaceutical industry and organic synthesis, as a catalyst. It is also used in the manufacture of nickel-cadmium batteries, nickel-hydrogen batteries and the production of hard alloys. The production process mainly includes metallic nickel method, spent nickel ca...

Claims

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Application Information

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IPC IPC(8): C01G53/10
Inventor 欧阳准贾荣曹建国朱芳宝张启文
Owner 中科铜都粉体新材料股份有限公司
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