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A kind of sulfuric acid calcining process lepidolite and the method for producing lithium carbonate

A technology of calcination treatment and lepidolite, applied in the direction of improving process efficiency, etc., can solve the problems of high production cost, lack of industry competitive advantage, and many by-products, and achieve the improvement of total recovery rate, improvement of extraction utilization rate, and stable production control Effect

Active Publication Date: 2018-08-24
宜春银锂新能源有限责任公司
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AI Technical Summary

Problems solved by technology

[0005] Compared with spodumene and salt lake brine extraction technology, the company's existing lithium carbonate production technology has higher production costs, more by-products, and lack of industry competitive advantages

Method used

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Embodiment Construction

[0026] The production process of the present invention is briefly described as follows: Lepidolite and concentrated sulfuric acid are calcined at high temperature and fluorine is removed → slurry → slurry drying → slurry roasting → material is leached with water → cooling crystallization → centrifugal separation → neutralization and removal of impurities → evaporation and concentration → sink lithium.

[0027] Concrete method is: a kind of sulfuric acid calcining process lepidolite and the method for producing lithium carbonate, it is characterized in that:

[0028] (1) Crush lepidolite to about 150 meshes, lepidolite and concentrated sulfuric acid with a mass fraction of 70wt% to 95wt% are put into the reaction device at a high temperature of 1600-1900°C according to the solid-liquid mass ratio of 1:3-5.5 , react for a period of 20-60 minutes; react in the reaction device for acid leaching to remove fluoride, and acid leaching to remove fluorine After the raw material is fill...

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Abstract

The invention discloses a method for lepidolite calcination treatment through vitriol and lithium carbonate preparation. The method for lepidolite calcination treatment through the vitriol and lithium carbonate preparation is characterized in that lepidolite is broken to be able to pass through a screen about 150 meshes, and according to a certain proportion and under a high temperature, the lepidolite and the vitriol are put into a reaction device to conduct reaction for a period of time; reacted slurry is added into a kiln to be subjected to drying roasting; a roasted material is directly leached by adding water at a certain temperature; and battery grade lithium carbonate and industrial grade lithium carbonate are prepared after the leached slurry is subjected to production techniques of cooling crystallization, centrifugal separation, neutralizing and purification, evaporation and concentration and lithium sediment. The method for lepidolite calcination treatment through the vitriol and lithium carbonate preparation has the advantages that compared with an existing technique, gypsum by-products of the technique can be reduced by 25% or more, the total recovery rate of the lithium carbonate is slightly improved, and all indexes of the lithium carbonate can reach national standards; and the content of Li20 in neutralizing and purification gypsum is reduced from 0.7-1.0% to 0.2-0.4%, production control is stable, and the recovery rate of the lithium carbonate in a workshop is improved by 5% or more.

Description

technical field [0001] The invention relates to a method for processing mineral raw materials, in particular to a method for treating lepidolite by sulfuric acid calcination and producing lithium carbonate. Background technique [0002] China's Yichun tantalum-niobium tailings is currently the largest tantalum-niobium-lithium albite granite deposit in Asia, and it is also one of the polymetallic mineral mining and dressing resource bases affiliated to China Nonferrous Metals Industry Corporation. Yichun tantalum-niobium tailings are rich in rare minerals Metal materials, such as tantalum, niobium, lithium, rubidium, cesium, potassium, sodium, etc. Lepidolite is a by-product obtained from the flotation of tantalum and niobium tailings, and its annual output can reach more than 200,000 tons. Its concentrate contains Li2O4.4%; Rb2O1.3%; Cs2O0.243%; it is an important industrial raw material for extracting lithium, rubidium and cesium, and its development and utilization has ve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/06C22B3/04C22B3/44C22B3/22C22B26/12
CPCC22B1/06C22B3/04C22B3/22C22B3/44C22B26/12Y02P10/20
Inventor 邹辉飞朱强辉钟亮黄艳军
Owner 宜春银锂新能源有限责任公司
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