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Co-production method for battery-grade lithium carbonate and magnesium based functional materials

A functional material, lithium carbonate technology, applied in chemical instruments and methods, lithium carbonate;/acid carbonate, inorganic chemistry, etc., can solve the problems of complex process, high cost of magnesium and lithium separation methods, and high cost, Achieve the effect of shortening the process flow, good industrialization prospects, and reducing forced evaporation

Inactive Publication Date: 2019-08-06
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent application enriches the concentration of lithium ions to 16,000ppm through the method of multi-stage reverse osmosis, and the salt content in the enriched solution will reach about 10%. However, under high concentration conditions, using reverse osmosis process for enrichment and concentration will increase investment Cost and equipment energy consumption
[0006] In summary, in the prior art, there are generally problems in the following aspects for the salt lake brine treatment method with high magnesium-lithium ratio: (1) the existing magnesium-lithium separation method has high cost and complicated process; (2) after the magnesium-lithium separation, Deep magnesium removal needs to be carried out in two steps, first adding soda ash, then adding caustic soda, the process is complicated and the cost is high; (3) after magnesium removal, the solution needs to be added with hydrochloric acid to adjust the pH, so that the solution is neutral before evaporation and concentration, which increases the cost; (4) The obtained lithium-containing solution in addition to magnesium needs to be further enriched and concentrated before it can be converted and prepared lithium carbonate. Enrichment and concentration mostly adopt forced evaporation means, which has large investment, high energy consumption, and high cost; (5) Utilize salt lake brine to prepare Lithium carbonate is mostly industrial grade, among which impurity ions such as chloride ion, sodium ion and magnesium ion are relatively high, which cannot meet the requirements of battery grade lithium carbonate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The salt lake old brine used in this embodiment comes from the old brine produced by a certain salt lake in Qinghai after potassium extraction, and the Li in this salt lake old brine + The content is 1g / L, and the ratio of magnesium to lithium is 100.

[0065] In the first step, after diluting the old brine of the salt lake with fresh water, it enters the membrane separation system for magnesium and lithium separation to obtain a lithium-rich solution.

[0066] Among them, Li in the diluted brine obtained after dilution + The content is 0.2g / L; and Li in the obtained lithium-rich solution + The content is 0.6g / L, and the ratio of magnesium to lithium is 0.01.

[0067] In the second step, the lithium-rich solution enters the reverse osmosis system for primary concentration to obtain a primary concentrate.

[0068] Among them, Li in the primary concentrate + The content is 1.5g / L, and the ratio of magnesium to lithium is 0.01.

[0069] In the third step, the primary co...

Embodiment 2

[0078] The salt lake old brine used in this embodiment comes from the old brine produced by a certain salt lake in Qinghai after potassium extraction, and the Li in this salt lake old brine + The content is 10g / L, and the ratio of magnesium to lithium is 5.

[0079] In the first step, after diluting the old brine of the salt lake with fresh water, it enters the membrane separation system for magnesium and lithium separation to obtain a lithium-rich solution.

[0080] Among them, Li in the diluted brine obtained after dilution + The content is 0.8g / L; and Li in the obtained lithium-rich solution + The content is 2g / L, and the ratio of magnesium to lithium is 0.4.

[0081] In the second step, the lithium-rich solution enters the reverse osmosis system for primary concentration to obtain a primary concentrate.

[0082] Among them, Li in the primary concentrate + The content is 7.5g / L, and the ratio of magnesium to lithium is 0.4.

[0083] In the third step, the primary conce...

Embodiment 3

[0092] The salt lake old brine used in this embodiment comes from the old brine produced by a certain salt lake in Qinghai after potassium extraction, and the Li in this salt lake old brine + The content is 7g / L, and the ratio of magnesium to lithium is 8.

[0093] In the first step, after diluting the old brine of the salt lake with fresh water, it enters the membrane separation system for magnesium and lithium separation to obtain a lithium-rich solution.

[0094] Among them, Li in the diluted brine obtained after dilution + The content is 0.7g / L; and Li in the obtained lithium-rich solution + The content is 3g / L, and the ratio of magnesium to lithium is 1.

[0095] In the second step, the lithium-rich solution enters the reverse osmosis system for primary concentration to obtain a primary concentrate.

[0096] Among them, Li in the primary concentrate + The content is 8g / L, and the ratio of magnesium to lithium is 1.

[0097] In the third step, the primary concentrated...

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Abstract

The invention provides a co-production method for battery-grade lithium carbonate and magnesium based functional materials based on salt lake old brine. The method includes the following steps: S1, performing preliminary magnesium-lithium separation on salt lake old brine; S2, performing reverse osmosis primary concentration; S3, performing electrodialysis secondary concentration; S4, preparing amagnesium based functional material; and S5, preparing battery-grade lithium carbonate. The provided method for co-producing the magnesium based functional material and the battery-grade lithium carbonate by using the salt lake old brine with a high magnesium-lithium ratio through magnesium-lithium separation, lithium enrichment and deep magnesium removal can effectively solve the technical problems of complex process, high costs and undesirable magnesium-lithium separation effects of previous methods; process during the preparation of the lithium carbonate can be greatly shortened; multiple processes such as forced evaporation, pH adjusting, lithium carbonate purifying and the changing of two-step magnesium removal into one step magnesium removal can be decreased; costs for preparing thebattery-grade lithium carbonate can be greatly reduced; and therefore, the method has good industrial prospects.

Description

technical field [0001] The invention belongs to the technical field of salt lake chemical industry, and specifically relates to a co-production method of battery-grade lithium carbonate and magnesium-based functional materials. Background technique [0002] Lithium is the lightest metal element in nature, silver-white, with unique physical and chemical properties such as high specific heat, high electrical conductivity and strong chemical activity, and has a wide range of uses. At present, metal lithium and its compounds are used in glass ceramics, electrolytic aluminum, Applications in traditional industrial fields such as grease, air-conditioning and refrigeration, organic synthesis, metallurgy, chemical industry, medicine, and reagents continue to grow, and applications in energy, military, aerospace, and nuclear industries such as aluminum-lithium alloys, lithium batteries, and nuclear fusion are also increasing. It is rapidly expanding, so it is known as "industrial mon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/00C01D15/08
CPCC01D15/08C01P2006/80C01F7/785
Inventor 王敏王怀有钟远赵有璟
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI