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Preparation method of lithium molybdate

A technology of lithium molybdate and molybdic acid, applied in chemical instruments and methods, molybdenum compounds, inorganic chemistry, etc., can solve the problems of unclean purification and fine particles of molybdate, and achieve low production cost, simple process and high purity. Effect

Inactive Publication Date: 2016-02-03
GANFENG LITHIUM CO LTD
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Problems solved by technology

[0003] And the main method of producing lithium molybdate at present is: utilize sodium molybdate and nitric acid reaction to prepare molybdic acid, then prepare lithium molybdate product with lithium hydroxide, this method obtains molybdic acid particle too fine, purification is not clean, and contains a large amount of Sodium, calcium, magnesium and other impurities lead to only about 97% of the main content of the subsequent products

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preparation example Construction

[0023] The preparation method of a kind of lithium molybdate of the present invention is described in further detail below.

[0024] A kind of preparation method of lithium molybdate of the present invention comprises following technological process:

[0025] A. Ingredients: Add pure water or centrifuged mother liquor and ammonium molybdate solid to the batching kettle, the liquid-solid ratio (wt%) is 2:1~6:1, stir for 30~60min to get ammonium molybdate solution;

[0026] B. Acid precipitation reaction: Add 50-100L pure water and 0.1-0.5kg molybdic acid powder into the reaction kettle, raise the temperature to 60-100°C, stir for 0.5-2h, control the pH of the solution to 0.1-3, and then pour it into the reaction kettle Add ammonium molybdate and inorganic acid dropwise at the same time, the dropping rate is 100~500L / h, and stir for 30~60min;

[0027] C. Purification of molybdenum acid: Wash the molybdenum acid slurry obtained in step B with inorganic acid and pure water succes...

Embodiment 1

[0037] A. Take by weighing 150kg ammonium molybdate and join in the batching kettle, add 900L pure water, stir 60min, obtain 1050Kg ammonium molybdate solution;

[0038] B. Add 100L pure water and 0.5kg molybdenum acid powder into the reaction kettle as the bottom liquid and seed crystal, raise the temperature to 100°C, stir for 2 hours, control the pH of the solution to 3, and then add the ammonium molybdate solution prepared in step A dropwise at the same time and 10mol / L of sulfuric acid solution into the reactor, the rate of addition is 500L / h, stirring and reacting for 60min;

[0039] C. the molybdic acid slurry obtained in step B is washed with 10mol / L sulfuric acid and pure water successively, and the sulfuric acid washing is carried out at normal temperature, and the pure water washing temperature is 100 ° C, washed 5 times, and centrifuged to obtain 23Kg molybdic acid ;

[0040] D. Add the molybdenum acid obtained in step C and 138L of pure water according to the rat...

Embodiment 2

[0046] A. Take by weighing 100kg ammonium molybdate and join in the batching kettle, add 400L centrifuge mother liquor, stir 30min, obtain 500Kg ammonium molybdate solution;

[0047] B. Add 50L of pure water and 0.1kg of molybdic acid powder into the reaction kettle as the bottom liquid and seed crystal, raise the temperature to 60°C, stir for 0.5h, control the pH of the solution to 0.1, and then add the ammonium molybdate prepared in step A dropwise at the same time Solution and the sulfuric acid solution of 3mol / L are in the reactor, and the rate of addition is 100L / h;

[0048] C. the molybdic acid slurry obtained in step B is washed with 3mol / L sulfuric acid and pure water successively, and the sulfuric acid washing is carried out at normal temperature, and the pure water washing temperature is 30 ° C, washed twice, and centrifuged to obtain 15Kg molybdic acid ;

[0049] D. Add the molybdenic acid obtained in step C and 30L of pure water (calculated according to the ratio of...

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Abstract

The invention discloses a preparation method of lithium molybdate. Ammonium molybdate is used as a raw material; high-purity molybdic acid is prepared in a manner of adding seed crystals, controlling a raw material feeding mode and controlling pH of a reaction system; then the molybdic acid reacts with battery-grade lithium hydroxide to synthesize the lithium molybdate. The technological process comprises the steps of burdening, acid settlement reaction, molybdic acid purification, alkali dissolution reaction, ammonium removal, evaporation concentration, cooling crystallization, drying and the like. The product prepared by the preparation method of the lithium molybdate, which is disclosed by the invention, has high purity, adopts a simple process and is low in production cost.

Description

technical field [0001] The invention relates to a preparation method of lithium salt, in particular to a preparation method of lithium molybdate. Background technique [0002] Lithium molybdate is mainly used in chemical industry, corrosion inhibitor, electrode material, cermet, resistor material, refrigeration and other fields, especially in the refrigeration industry with broad market prospects. After the Montreal Convention banned Freon refrigerators, lithium bromide refrigerators have been rapidly developed around the world. Lithium molybdate is an inorganic corrosion inhibitor with high application value in lithium bromide absorption refrigerators. It has a particularly outstanding corrosion inhibition effect and has no pollution to the environment. With the global emphasis on resources and environmental protection, the environment will be protected by law, lithium bromide refrigerators will replace Freon refrigerators, and the amount of lithium molybdate will increase...

Claims

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Application Information

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IPC IPC(8): C01G39/00
CPCC01G39/00
Inventor 李良彬白有仙李芳芳邓云华侯太行彭爱平李忠
Owner GANFENG LITHIUM CO LTD
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