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A method of recovering and utilizing salt lake lithium extraction mother liquor and producing a by-product basic magnesium carbonate

A technology for extracting lithium mother liquor and lithium mother liquor from salt lakes, which is applied in the direction of lithium carbonate; Benefits and economic benefits, the effect of improving recycling rate and reducing production cost

Active Publication Date: 2014-09-10
QINGHAI LITHIUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The processes of the four companies are different. Qinghai Lithium uses the membrane method to separate magnesium and lithium, Lanke Lithium uses the adsorption method to separate magnesium and lithium, and Guoan Lithium uses the calcination method to separate magnesium and lithium. Due to the differences in the three processes , the lithium carbonate tail liquid produced by each enterprise is different, and the three companies have nothing to learn from each other in terms of tail liquid recycling. Compared with our company, the properties are also quite different, so there is not much reference for our company's recovery and utilization of lithium carbonate tail liquid
During the first phase of the 3,000-ton lithium carbonate project, the two mother liquors were discharged in an abandoned salt pan without any recycling
In May 2012, the 7,000-ton project of the second phase of lithium carbonate was put into operation. The two mother liquors were treated as follows. First, the two mother liquors were mixed into a buffer pool, and the mixed mother liquor was introduced into a special salt pan for storing tail liquor. After the two mother liquids are mixed, the tail liquid system becomes very complicated, which increases the difficulty of recycling

Method used

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  • A method of recovering and utilizing salt lake lithium extraction mother liquor and producing a by-product basic magnesium carbonate
  • A method of recovering and utilizing salt lake lithium extraction mother liquor and producing a by-product basic magnesium carbonate
  • A method of recovering and utilizing salt lake lithium extraction mother liquor and producing a by-product basic magnesium carbonate

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Experimental program
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Effect test

Embodiment 1

[0028] (1) Lithium Extraction Mother Liquor 1 is the tail liquid produced in the separation process of magnesium and lithium in brine with a high magnesium-lithium ratio raw material. The contents of lithium and magnesium in the tail liquid are respectively: Li + The content is 0.6g / L, Mg 2+ The content is 38g / L, and the mother liquor 2 is the tail liquid produced in the conversion lithium precipitation process, which contains 2.2g / L Li + In addition to ions, it also contains 15g / L of CO 3 2- ions and 80g / L NaCl, the temperature of mother liquor 1 is between 25°C and the temperature of mother liquor 2 is between 85°C, mix mother liquor 2 and mother liquor 1 at a ratio of 6:1, and the temperature of the solution after mixing is between 50°C , after mixing, stir the reaction for 25 minutes, CO in the mother liquor 1 3 2- Ions and Mg in Mother Liquor II 2+ Basic magnesium carbonate is formed, and crude basic magnesium carbonate is obtained after pressure filtration and separ...

Embodiment 2

[0033] (1) Lithium Extraction Mother Liquor 1 is the tail liquid produced in the separation process of magnesium and lithium in brine with a high magnesium-lithium ratio raw material. The contents of lithium and magnesium in the tail liquid are respectively: Li + The content is 0.7g / L, Mg 2+ The content is 43g / L, and the mother liquor 2 is the tail liquid produced in the conversion lithium precipitation process, which contains 2.0g / L Li + In addition to ions, it also contains 17g / L of CO 3 2- ions and 90g / L NaCl, the temperature of mother liquor 1 is 30°C, the temperature of mother liquor 2 is 90°C, mix mother liquor 2 and mother liquor 1 at a ratio of 5:1, the temperature of the solution after mixing is 55°C, stir and react for 25 minutes, CO in mother liquor 3 2- Ions and Mg in Mother Liquor II 2+ Basic magnesium carbonate is formed, and crude basic magnesium carbonate is obtained after pressure filtration and separation, and the mother liquor needs to be further proces...

Embodiment 3

[0038] (1) Lithium Extraction Mother Liquor 1 is the tail liquid produced in the separation process of magnesium and lithium in brine with a high magnesium-lithium ratio raw material. The contents of lithium and magnesium in the tail liquid are respectively: Li + The content is 0.8g / L, Mg 2+ The content is 48g / L, and the mother liquor 2 is the tail liquid produced in the conversion lithium precipitation process, which contains 1.8g / L Li + In addition to ions, it also contains 20g / L CO 3 2- ions and 100g / L NaCl, the temperature of mother liquor 1 is 35°C, the temperature of mother liquor 2 is 95°C, mix mother liquor 2 and mother liquor 1 at a ratio of 4:1, the temperature of the solution after mixing is 60°C, stir and react for 25 minutes, CO in mother liquor 3 2- Ions and Mg in Mother Liquor II 2+ Basic magnesium carbonate is formed, and crude basic magnesium carbonate is obtained after pressure filtration and separation, and the mother liquor needs to be further processe...

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Abstract

The invention provides a method of recovering and utilizing salt lake lithium extraction mother liquor and producing a by-product basic magnesium carbonate. The method includes: mixing first lithium carbonate mother liquor and second lithium carbonate mother liquor according to a certain ratio, reacting, filtering, washing, and drying to obtain industrial basic magnesium carbonate hydrate; and removing carbonate ion residue in the mother liquor after reaction with industrial hydrochloric acid having a concentration of 31%, mixing the mother liquor after the carbonate ion removal with brine that is a raw material for producing lithium carbonate according to a ratio, and performing natural crystallization and sodium precipitation for 10-20 days. After the natural crystallization and sodium precipitation, the content of Li+ is 5-6 g / L and the content of Na+ is smaller than 2.5 g / L, thus reaching requirements for using in workshops. By the manner, the lithium carbonate lithium extraction mother liquor is prepared into the raw material brine for production of the lithium carbonate. The method is simple in process and low in cost, and effectively increases the comprehensive utilization rate of the lithium resource.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, and in particular relates to a method for recycling lithium mother liquor extracted from salt lakes. Background technique [0002] As the basic lithium salt of lithium, lithium carbonate is used as an additive and flux in the process of glass manufacturing and ceramic production. In recent years, the demand for lithium salt products has grown steadily at a rate of 6% to 8% per year, especially with the rapid development of building materials, electronics, automobiles, information, energy storage batteries and other industries, lithium carbonate has become the most important lithium compound. The product. [0003] Due to the different raw materials, the production process of lithium carbonate is also different. Generally, it can be divided into the ore method using ore as raw material and the brine method using brine as raw material. Since Qinghai Lithium Industry Co., Ltd. a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08C01F5/24
Inventor 刘国旺李增荣李健马军周晓军贾发云黎永娟薛芳英马蕊瑞聂金莲
Owner QINGHAI LITHIUM IND
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