A method for preparing magnesium-based hydrotalcite and co-producing boric acid with high magnesium-lithium ratio salt lake brine

A magnesium-based hydrotalcite and salt lake brine technology, applied in the field of comprehensive utilization of salt lake resources, can solve the problem of comprehensive utilization of magnesium boron resources in salt lakes without development and utilization of magnesium resources in salt lakes, comprehensive utilization of magnesium resources in salt lakes without boric acid extraction, natural environment and mining of salt lakes Environmental degradation and other issues, to achieve the effect of low utilization rate of magnesium resources, improve service life, and reduce costs

Active Publication Date: 2018-05-08
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2010, the annual output of potassium chloride reached more than 2.4 million tons, and the annual by-product was 76.8 million tons of old brine, equivalent to more than 26.4 million tons of magnesium chloride. It has increased year by year, and it has caused damage to the ecological environment of the salt lake and formed "magnesium damage", which has led to the deterioration of the natural environment and mining environment of the salt lake, seriously affecting the economical and resource-balanced exploitation of resources such as potassium, lithium, and boron. The "bottleneck" of development and utilization
[0006] Chinese Patent Publication No. CN1579937A used salt lake brine to prepare nano-magnesium aluminum hydrotalcite, but did not study the ratio of magnesium to lithium in salt lake brine and the preparation of boric acid
"Adsorption of Boron in Salt Lake Brine by XSC-700 Resin" (Journal of Central South University (Natural Science Edition), Volume 42, No. 6, June 2011) once reported the use of XSC-700 chelating resin adsorption method to extract boron, but A large number of elements such as magnesium in brine have a certain influence on the adsorption amount and adsorption rate of boron, and finally affect the recovery rate of boron, which increases the cost of preparing boric acid by ion exchange adsorption method, and this method is only suitable for the extraction of boric acid in salt lake brine. Exploratory research on boron has been carried out, but no development and utilization of magnesium resources in salt lakes and comprehensive utilization of magnesium and boron resources in salt lakes
Chinese Patent Publication No. CN 102994748A, invented a fixed-bed method for boron removal from salt lake magnesium chloride brine, which is suitable for boron removal in salt lake magnesium chloride, without boric acid extraction and comprehensive utilization of salt lake magnesium resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 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 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 is hydrothermally aged at 50°C for 6 hours, filtered and washed until the filtrate is nearly neutral, and the hydrotalcite product is dried at 60°C for 6 hours to obtain the magnesium aluminum hydrotalcite product with a purity of 99%. , the ratio of magnesium to lithium in the obtained low-magnesium-lithium ratio mother liquor is reduced to 0.015. Adding 0.5mol / L hydrochloric acid to regulate the pH of the obtained hydrotalcite ...

Embodiment 2

[0042] 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 246g FeCl 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 12h, filtered and washed until the filtrate was nearly neutral, and the hydrotalcite product was dried at 70°C for 12h to obtain a magnesium-iron hydrotalcite product with a purity of 99.2%. The low magnesium-lithium ratio mother liquor magnesium-lithium ratio was reduced to 0.008. Adding 1mol / L nitric acid to regulate the pH of the hydrotalcite mother liquor obtained is 8, then the hydrotalcite moth...

Embodiment 3

[0044] 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 421.6g CrCl 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 is hydrothermally aged at 70°C for 18 hours, filtered and washed until the filtrate is nearly neutral, and the hydrotalcite product is dried at 80°C for 24 hours to obtain the magnesium chromium hydrotalcite product, the product purity is 99.13%, the ratio of magnesium to lit...

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Abstract

The invention relates to the field of comprehensive utilization of salt lake resources. Specifically, the invention relates to a method for preparing magnesium-based intercalation functional materials and co-producing boric acid by using salt lake brine with a high magnesium-lithium ratio. The invention uses high-magnesium-lithium salt lake brine as raw material, adds certain soluble trivalent metal salts, fully utilizes magnesium resources in high-magnesium-lithium ratio salt lake brine by synthesizing magnesium-based layered functional materials, and then uses low-magnesium-lithium ratio hydrotalcite mother liquor to prepare boric acid. The preparation method of the magnesium-based functional material and boric acid provided by the present invention can not only effectively solve the problem of complex process, high cost, low utilization rate of salt lake resources, and "magnesium damage" formed in the production process of potash fertilizer in the previous methods, but also greatly reduce the cost of preparing boric acid Moreover, the abandoned magnesium resources can be fully utilized, the production cost of magnesium-based functional materials is reduced, and the high-value and comprehensive utilization of magnesium-boron resources in salt lakes is realized, which has good industrialization prospects.

Description

technical field [0001] The present invention relates to the field of comprehensive utilization of salt lake resources. Specifically, the present invention relates to a method for preparing magnesium-based hydrotalcite and co-producing boric acid with high magnesium-lithium ratio salt lake brine. Based functional material and method for co-production of boric acid. Background technique [0002] my country's salt lakes are rich in resources, with a potential value of several trillion yuan, among which potassium, sodium, magnesium, lithium, boron and other resources are particularly rich. Especially the salt lake magnesium and boron resources have good prospects for development and utilization, and Qinghai salt lake resources are the most representative. [0003] my country pays more and more attention to the development and utilization of salt lake magnesium resources. On the one hand, my country's salt lake magnesium resources are high-grade, large reserves, and easy to mine...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B35/10C01F7/02C01G49/02C01G37/00
Inventor 王敏王怀有赵有璟李锦丽时历杰钟远
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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