Process method for extracting low-concentration boracic acid in magnesium-containing brine

An extraction process and low-concentration technology, applied in the extraction process of low-concentration boric acid in magnesium-containing brine, and in the field of boric acid extraction in magnesium-containing brine, can solve problems affecting product quality and achieve significant economic benefits, easy industrialization, and quality improvement. Effect

Inactive Publication Date: 2009-09-30
HEBEI UNIV OF TECH
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  • Summary
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AI Technical Summary

Problems solved by technology

However, after the brine is acidified and extracted, there are still about 8g/l boric acid in the mother liquo

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The test sample of the present invention is the brine after acidification and boron precipitation of brine in Xitai Salt Lake, Qinghai, and the composition is as follows:

[0020] g / L B 2 o 3 Mg 2+ Cl - SO 4 2-

[0021] (Concentration) 8.002 96.268 352.64 6.22

[0022] The process steps are as follows:

[0023] (1) At room temperature, add concentrated hydrochloric acid to the brine solution to adjust the pH value of the brine to 3;

[0024] (2) Mix hexanol and benzene with an alcohol concentration of 0.66 to form a complex extraction agent.

[0025] (3) Using the prepared complex extraction agent, according to the extraction ratio of 2:1, the brine is extracted.

[0026] (4) Re-extract and regenerate the extract phase, pure water: extract phase = 2:1.

[0027] (5) The water phase obtained by stripping is subjected to solar evaporation to directly obtain the boric acid product.

[0028] Brine boron content after extraction (mg / L) = 25 mg / L ...

Embodiment 2-4

[0030] Embodiment 2-4, experimental procedure is the same as embodiment 1, and the results are shown in Table 1.

[0031] Table 1: Process conditions and results of the present invention

[0032] project Example 2 Example 3 Example 4 brine pH value 0.1 1.5 4 extractant Butanol / Toluene Heptanol / No. 200 solvent oil Decanol / kerosene Alcohol concentration (volume fraction) 0.99 0.5 0.1 Extraction compared to 0.1：1 5∶1 10∶1 water stripping vs. 0.1∶1 5∶1 10∶1 Boron content in brine after extraction (mg / L) 26 20 22 Boron content in stripped organic phase (mg / L) 8 5 4

[0033] It can be seen from Table 1 that the boron content in the brine after extraction is reduced to below 30 mg / L, which no longer affects the quality of magnesium products.

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PUM

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Abstract

The invention relates to a process method for extracting low-concentration boracic acid in magnesium-containing brine, which comprises the following steps that: at room temperature, a mixed solvent mixed by monacid alcohol and a nonpolar organic solvent is used as a complexing extractant to extract acidified brine to obtain an extraction phase; then water is used for carrying out back extraction on the extraction phase; the boracic acid is back-extracted to a water phase; a mixed extraction solvent is regenerated; and the water phase containing the boracic acid is condensed and evaporated to directly obtain a boracic acid product. The process method can remove the low-content boron to substantially improve the quality of a produced magnesium product, can obtain the boracic acid as a byproduct, fully realizes the comprehensive development and utilization of magnesium-containing saline brine and has remarkable economic benefits.

Description

technical field [0001] The invention relates to a process technology for the development and comprehensive utilization of salt lake brine resources, in particular to a process for extracting low-concentration boric acid from magnesium-containing brine, which can be applied to the extraction of boric acid from magnesium-containing brine. Background technique [0002] In the comprehensive development and utilization of salt lake brine, the chloride-type brine containing potassium, magnesium, and boron, after removing potassium, concentrates and acidifies boron precipitation, most of the boron is precipitated in the form of boric acid, leaving low-content boron (about 8 g / liter) magnesium chloride brine solution, this part of brine solution can be used to produce magnesium-containing products, such as magnesium chloride, magnesium oxide, etc. However, due to the existence of low content of boron, the quality of the produced magnesium products is seriously affected. [0003] C...

Claims

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Application Information

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IPC IPC(8): C01B35/10
Inventor 吕建华李春利李柏春
Owner HEBEI UNIV OF TECH
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