System method for extracting lithium-containing brine from lepidolite and manufacturing lithium salt

A lepidolite and brine technology, applied in lithium carbonate;/acid carbonate, silicate, lithium halide, etc., can solve the problems of long leaching time, poor selectivity, and product quality decline, etc. Achieve the effect of improving the comprehensive added value, the overall process is simple, and the product quality is stable
CN111137908AActive Publication Date: 2020-05-12CHANGSHA YUANPENG CHEM TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHANGSHA YUANPENG CHEM TECH
Publication Date
2020-05-12

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Abstract

The invention discloses a system method for extracting lithium-containing brine from lepidolite and manufacturing lithium salt. The system method comprises the following steps: material mixing, roasting, brine preparation, lithium salt preparation and comprehensive utilization of tailing slag. According to the invention, sulfuric acid double salt and sulfuric acid (selected) are used as auxiliarymaterials to be mixed with the lepidolite for reaction; the system method is applicable to extraction of lithium in high-content and low-content lepidolite; good selectivity is achieved during extraction; the extraction rate of lithium is 95.5%-97.5%; and the extraction rates of K, Rb and Cs are smaller than 30%; the obtained brine is neutral and can be used for directly preparing lithium hydroxide monohydrate, lithium chloride or lithium carbonate, and the total yield of lithium is more than 92%; the process is high in flexibility, can produce single-variety lithium salt, and can jointly produce two or more varieties of lithium salt; and fluorine in the lepidolite can be separated and recovered, so the additional value is increased, and the lithium extraction tailing slag can be comprehensively utilized. The system method provided by the invention has the following advantages: the whole process is short in flow, low in cost and friendly to the environment; and the system method has good economic benefits and social benefits and good industrial application values.
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Description

technical field

[0001] The invention relates to a systematic method for extracting lithium-containing brine from lepidolite and producing lithium salt, which is suitable for extracting lithium-containing brine from lepidolite and producing lithium salt (lithium hydroxide monohydrate, lithium chloride, lithium carbonate), It belongs to the technical field of rare metal extraction. Background technique

[0002] Lithium salts currently produced on a large scale include lithium carbonate, lithium hydroxide monohydrate, lithium chloride, lithium fluoride, lithium sulfide, lithium dihydrogen phosphate, and lithium hexafluorophosphate. Among them, the production scale of lithium carbonate, lithium hydroxide monohydrate and lithium chloride ranks the top three, and the three can be transformed into each other, and they are also the basic materials for the preparation of other lithium salts.

[0003] Lithium carbonate is widely used in glass, ceramics, lubricants, medicine and other...

Claims

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