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

A technology of salt lake brine and lithium hydroxide, applied in the field of comprehensive utilization of salt lake resources, can solve the problems of research, inability to produce lithium hydroxide, high energy consumption and cost, achieve inhibition of oxygen evolution reaction, improve industrialization prospects, and reduce magnesium Effect of Lithium Ratio

Active Publication Date: 2015-12-23
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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Problems solved by technology

The content of calcium impurities in the product of this method is high, which is difficult to completely remove, which seriously affects the purity of the product. In addition, the purification process of this method is cumbersome, the investment in equipment is high, and the production cost is high
[0005] Chinese Patent Publication No. CN1579937A used salt lake brine to prepare nano-magnesium-aluminum hydrotalcite, and did not study the magnesium-lithium ratio in salt-lake brine and the preparation of lithium hydroxide. The mother liquor after preparing nano-magnesium-aluminum hydrotalcite was alkaline and contained CO 3 2- , cannot be directly used in the production of products such as lithium hydroxide, and the SO present in the mother liquor 4 2- and B are also not conducive to the enrichment of lithium and the preparation of lithium hydroxide
The above two methods require a large amount of alkali in the magnesium removal section of the brine, the energy consumption and cost are high, and a large amount of magnesium resources are wasted at the same time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The composition of the obtained old brine is shown in Table 1 after evaporating the brine from Jinel Salt Lake in Dongtai, Qinghai Province to precipitate mixed salts of sodium chloride, potassium and magnesium, in which the ratio of magnesium to lithium is 13. Take 1L old brine, adjust the Mg 2+ The concentration is 5.5mol / L, add 175.6gAlCl 3 ·6H 2 O is made into a mixed salt solution; weigh 700.4g sodium hydroxide and 116g sodium carbonate to configure a mixed alkali solution with a molar concentration of sodium hydroxide of 11mol / L, and synthesize magnesium aluminum hydrotalcite at a temperature of 25°C and a pH of 8 by precipitation method . The prepared hydrotalcite slurry was hydrothermally aged at 50°C for 6 hours, filtered and washed until the filtrate was nearly neutral, and the hydrotalcite product was dried at 60°C for 6 hours to obtain the magnesium aluminum hydrotalcite product with a purity of 99%. The low magnesium-lithium ratio in the mother liquor re...

Embodiment 2

[0050] The composition of the obtained old brine is shown in Table 1, where the ratio of magnesium to lithium is 12. Take 1L old brine, adjust the Mg 2+ The concentration is 1.8mol / L, add 246gFeCl 3 ·6H 2 O is made into a mixed salt solution; weigh 436g of sodium hydroxide and 116g of sodium carbonate to configure a mixed alkali solution with a molar concentration of sodium hydroxide of 5.5mol / L, and use the constant pH method to synthesize magnesium-iron hydrotalcite at a temperature of 35°C and a pH of 9. . The prepared hydrotalcite slurry was hydrothermally aged at 60°C for 12 hours, filtered and washed until the filtrate was nearly neutral, and the hydrotalcite product was dried at 70°C for 12 hours to obtain the magnesium-iron hydrotalcite product with a purity of 99.2%. Low magnesium lithium ratio mother liquor magnesium lithium ratio is reduced to 0.008. Adding 1mol / L nitric acid to regulate the pH of the hydrotalcite mother liquor obtained is 8, and the obtained hy...

Embodiment 3

[0053] After the brine of Chaerhan Salt Lake in Qinghai was evaporated in the salt field to precipitate mixed salts of sodium chloride, potassium and magnesium, the composition of the old brine obtained is shown in Table 2, and the ratio of magnesium to lithium is 312. Take 1L old brine, adjust the Mg 2+ The concentration is 1.58mol / L, add 421.6gCrCl 3 ·6H 2 O is made into a mixed salt solution; weigh 569.6g of sodium hydroxide and 150.8g of sodium carbonate to configure a mixed alkali solution with a molar concentration of sodium hydroxide of 4.75mol / L, and use the constant pH method to synthesize magnesium at a temperature of 45°C and a pH of 10 Chromium hydrotalcite. The prepared hydrotalcite slurry was hydrothermally aged at 70°C for 18 hours, filtered and washed until the filtrate was nearly neutral, and the hydrotalcite product was dried at 80°C for 24 hours to obtain the magnesium chromium hydrotalcite product with a purity of 99.13%. The low magnesium-lithium ratio ...

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Abstract

The invention relates to the field of comprehensive utilization of salt lake resources, in particular to a method for preparing lithium hydroxide from salt lake brine with the high magnesium-lithium ratio. The method includes the steps that the salt lake brine with the high magnesium-lithium ratio serves as a raw material, and a certain amount of soluble trivalent metal salt is added; the magnesium-lithium ratio of the salt lake brine with the high magnesium-lithium ratio is reduced by synthesizing magnesium-based layered function materials so that magnesium and lithium in the salt lake brine with the high magnesium-lithium ratio can be separated; the magnesium in the brine is removed, and then the lithium hydroxide is prepared through lithium-rich hydrotalcite mother liquor. By means of the method for separating the magnesium from the lithium and preparing the lithium hydroxide, the technical problems that as for original methods, technologies are complex, cost is high, the use rate of magnesium resources and the use rate of lithium resources are low, and the magnesium-lithium separating effect is not ideal can be effectively solved, technological processes for preparing the lithium hydroxide are simplified, and cost is reduced; in addition, the waste magnesium resources can be sufficiently used; meanwhile, the cost of the magnesium-based function materials is reduced, higher-value utilization and comprehensive utilization of the salt lake magnesium resources, the salt lake lithium resources and salt lake boron resources are achieved, and good industrialization prospects are achieved.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of salt lake resources. Specifically, the invention relates to a method for preparing lithium carbonate from salt lake brine with a high magnesium-lithium ratio. Method for Lithium Preparation. Background technique [0002] Lithium is the lightest metal, known as "the energy metal that promotes the progress of the world". It has unique physical and chemical properties, and is a strategic resource of great significance in national economy and national defense construction. In nature, lithium resources mainly occur in solid ore and liquid brine. In the past, my country did not pay enough attention to lithium extraction from salt lake brine. Over the years, my country's lithium salt production is still dominated by lithium-containing ores such as spodumene and lepidolite. Because the extraction of lithium from salt lake brine has the advantages of large resources and low cost, and with the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/24C22B26/12C25B1/20
CPCY02P10/20
Inventor 王怀有王敏李锦丽时历杰赵有璟钟远
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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