Method for refining lithium from salt lake brine with high magnesium-lithium ratio

A technology of salt lake brine and high magnesium-to-lithium ratio, applied in the field of refined lithium, can solve the problems of not considering the influence of membrane performance of magnesium-lithium separation effect, not considering the applicability of equipment, and increasing the number of nanofiltration membrane systems, etc. The effect of easy promotion and application, improving quality and competitiveness, and reducing energy consumption
CN103570048AInactive Publication Date: 2014-02-12QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
Publication Date
2014-02-12
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for refining lithium from salt lake brine with a high magnesium-lithium ratio. The method comprises the following steps: 1) removing sulfate radicals from brine from which sodium and potassium are extracted, evaporating the brine to obtain lithium-rich and boron-rich brine; 2) extracting boron from the lithium-rich and boron-rich brine to obtain boric acid and lithium-rich brine; 3) separating the lithium-rich brine by using a nanofiltration membrane to obtain primary concentrated water and primary produced water; 4) through reverse osmosis, separating the primary produced water to obtain secondary produced water and fresh water; 5) removing magnesium from the secondary produced water, and evaporating the secondary produced water to obtain refined lithium-rich brine. The method is simple in technological process; by the method, the energy consumption is greatly reduced, salt lake brine resources are fully used, and the recycling rate of the lithium ions is greatly improved; influence of the boron on lithium carbonate or other lithium salt products is avoided, thus the quality and the competitiveness of products are greatly improved.
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Description

technical field

[0001] The invention belongs to the field of salt lake chemistry, and in particular relates to a method for refining lithium from salt lake brine with a high magnesium-lithium ratio. Background technique

[0002] Lithium is the lightest metal in the world. Due to its special properties, lithium and its compounds have extensive and special uses, and are known as "energy metals" and "metals that drive the world forward". It plays an extremely important role in the energy industry, aerospace industry, metal smelting and manufacturing industry, refrigeration, ceramics, glass and other industries. At present, the global demand for lithium products is very urgent, and the demand for lithium is increasing rapidly year by year.

[0003] The largest resource of lithium in the world is lithium ore, mainly including spodumene, lepidolite, lithium petalite, spodumene and eucryptite. The traditional lithium mining industry mainly extracts lithium products through strong...

Claims

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