Method for preparing lithium carbonate through salt lake brine with high ratio of magnesium to lithium

A salt lake brine and high magnesium-lithium ratio technology, applied in the field of comprehensive utilization of salt lake resources, can solve the problems of large amount of evaporated water, pollution of salt lake resources, membrane clogging or damage, etc., achieve less water consumption and acid-base, improve economic benefits, The effect of reducing the ratio of magnesium to lithium

Active Publication Date: 2015-12-16
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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Problems solved by technology

But this method produces hydrogen chloride gas in the production process, which is easy to corrode equipment, and the amount of evaporated water is large, high energy consumption, and high cost
Multi-stage membrane separation technology, in the reverse osmosis concentration process, the membrane is prone to clogging or damage, and the cost of using the membrane is relatively high
The key to the adsorption method is the adsorbent. Lithium-ion sieve-type manganese oxide and titanium oxide materials have been paid attention to, but their actual adsorption capacity is low, their permeability is poor, and there are problems of dissolution loss and granulation.
[0005] Chinese Patent Publication No. CN1579937A used salt lake brine to prepare nano-magnesium-aluminum hydrotalcite, and did not study the ratio of magnesium to lithium in salt lake brine and the preparation of lithium carbonate. The mother liquor after preparing nano-magnesium-aluminum hydrotalcite was alkaline and contained CO 3 2- , cannot be directly used in the product...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 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 of sodium hydroxide and 116g of sodium carbonate to configure a mixed alkali solution with a molar concentration of sodium hydroxide of 11mol / L, and use the coprecipitation method to synthesize magnesium-aluminum water at a temperature of 25°C and a pH of 8 talc. 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 mot...

Embodiment 2

[0047] 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

[0050] 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 salt lake resource comprehensive utilization, in particular to a method for preparing lithium carbonate through salt lake brine with the high ratio of magnesium to lithium. The salt lake brine with the high ratio of magnesium to lithium serves as a raw material, a certain amount of soluble trivalent metal salt is added, the ratio of magnesium to lithium in the salt lake brine is reduced by synthesizing magnesium-based stratified functional materials, magnesium and lithium in the salt lake brine with the high ratio of magnesium to lithium are separated, and then lithium carbonate is prepared through hydrotalcite mother liquor with the low ratio of magnesium to lithium. The technical problems that an existing method is complex in process, cost is high, and the magnesium and lithium separation effect is not ideal can be effectively solved through magnesium and lithium separation and lithium carbonate preparation methods, the lithium carbonate preparation process is simplified, cost is reduced, waste magnesium resources are fully utilized, and meanwhile the cost of the magnesium-based functional materials is reduced; high-valued and comprehensive utilization of salt lake magnesium, lithium and boron resources is 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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IPC IPC(8): C01D15/08
Inventor 王敏王怀有时历杰赵有璟李锦丽钟远
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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