Method for removing boron and iron from boron containing magnesium chloride saturated liquid

A magnesium chloride and boron removal technology, applied in the direction of magnesium chloride, magnesium halide, etc., can solve the problems of large dissolution loss, high boron extraction efficiency, low recovery rate, etc., and achieve the effect of solving large dissolution loss, short process flow and simple operation

Inactive Publication Date: 2008-12-10
青海中信国安科技发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are three methods for extracting boric acid from brine. At present, the acidification method is mainly used to extract boric acid. This method is only applicable to 2 o 3 >20g/l brine, after extracting boric acid, there is still 6~7g/lB in the brine 2 o 3 Existence, the crude boric acid recovery rate after acidification is 70-75%, the recovery rate is relatively low, and this method is for B 2 o 3 Salt lake brine with content less than 10g/l is not applicable
The second method is the high-efficiency boron resin method, and the boron (in B 2 o 3 (calculated) to below 10mg/l, boron recovery > 99%, but this method has an obvious shortcoming, that is, the B in the

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  • Method for removing boron and iron from boron containing magnesium chloride saturated liquid

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Effect test

Embodiment 1

[0009] A method for removing boron and iron from a boron-containing magnesium chloride saturated liquid, adding sulfuric acid to the boron-containing magnesium chloride saturated liquid, adjusting the pH value of the slurry to 1, stirring and reacting at room temperature for 30 minutes, filtering the slurry to obtain crude boric acid and acidizing liquid, Crude boric acid is refined to obtain boric acid, and acidification solution (B 2 o 3 7.5g / l, Fe 2 o 3 130 mg / l) 400 ml, add 600 ml of extraction agent and mix, place in a 1500 ml separatory funnel and shake for 20 minutes after mixing, separate phases after standing, phase separation time is 1 minute, carry out 10-stage countercurrent extraction, and finally obtain saturated organic Phase and raffinate, the raffinate is low boron and low iron magnesium chloride saturated liquid, in the raffinate B 2 o 3 Content below 25mg / l, Fe 2 o 3 22mg / l, boron recovery rate > 99%, the saturated solution is used to prepare high-puri...

Embodiment 2

[0011] A method for removing boron and iron from boron-containing magnesium chloride saturated liquid, adding sulfuric acid to the boron-containing magnesium chloride saturated liquid, adjusting the pH value of the slurry to 3, stirring and reacting at room temperature for 60 minutes, filtering the slurry to obtain crude boric acid and acidizing liquid, Crude boric acid is refined to obtain boric acid, and acidification solution (B 2 o 3 7.5g / l, Fe 2 o 3 130 mg / l) 400 ml, add 400 ml of extractant and mix, place in a 1000 ml separatory funnel after mixing and shake for 3 minutes, separate the phases after standing for 20 minutes, carry out 7-stage countercurrent extraction, and finally obtain saturated organic Phase and raffinate, the raffinate is low boron and low iron magnesium chloride saturated liquid, in the raffinate B 2 o 3 Content below 20mg / l, Fe 2 o 3 20mg / l, boron recovery rate > 99%, the saturated solution is used to prepare high-purity magnesium salt, 400 ml ...

Embodiment 3

[0013] A method for removing boron and iron from boron-containing magnesium chloride saturated liquid, adding sulfuric acid to the boron-containing magnesium chloride saturated liquid, adjusting the pH value of the slurry to 2, stirring and reacting at room temperature for 45 minutes, filtering the slurry to obtain crude boric acid and acidizing liquid, Crude boric acid is refined to obtain boric acid, and acidification solution (B 2 o 3 7.5g / l, Fe 2 o 3 130 mg / l) 400 ml, add 400 ml of extractant and mix, place in a 1000 ml separatory funnel after mixing and shake for 15 minutes, separate phases after standing, phase separation time is 15 minutes, carry out 8-stage countercurrent extraction, and finally obtain saturated organic Phase and raffinate, the raffinate is low boron and low iron magnesium chloride saturated liquid, in the raffinate B 2 o 3 Content below 23mg / l, Fe 2 o 3 24mg / l, boron recovery rate > 99%, the saturated solution is used to prepare high-purity magn...

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Abstract

The invention pertains to the technical field of inorganic salt chemical industry, and in particular relates to a method for removing boron and iron from a saturated boron-bearing magnesium chloride solution. The method is a coordinate process integrating acidification and extraction which aims at solving the deficiency of the present process for removing boron and iron from the saturated boron-bearing magnesium chloride solution in salt lakes, and the technological process includes an acidification and boron extraction section, a filtration section, an extraction section and a reverse extraction section. The saturated boron-bearing magnesium chloride solution is taken as the raw material in the method, to which hydrochloric acid or sulfuric acid is added to acidify and precipitate boric acid, the remnant boric acid in the acidizing solution is extracted and removed by a mixed alcohol, the contents of B2O3 and Fe2O3 can be reduced to be less than 25mg/l, and the recovery ratio of boric acid reaches more than 99%; owing to the adoption of the mixed alcohol extraction technology, the method not only solves the problem of great extractant loss in the extraction method effectively, but also removes iron from the saturated magnesium chloride solution, and has the advantages of short technological process, simple operation and high yield.

Description

1. Technical field [0001] The invention belongs to the technical field of inorganic salt chemical industry, and in particular relates to a method for removing boron and iron from boron-containing magnesium chloride saturated liquid. 2. Technical background [0002] Salt lakes in the Qaidam Basin are rich in salt mineral resources, and the main useful elements are potassium, sodium, magnesium, boron, lithium, etc., among which boron, magnesium, and lithium are enriched in the saturated magnesium chloride solution after potassium extraction, and can be extracted from it Extracting lithium salt, borate and high-purity magnesium salt has great utilization value. However, most high-purity magnesium salt products require very low boron and iron content. Therefore, the development of boric acid extraction from the boron-containing magnesium chloride saturated solution and the removal of the remaining boron and iron technology is the boron and magnesium resources in the brine of the...

Claims

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Application Information

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IPC IPC(8): C01F5/30
Inventor 杨建元李陇岗保守君赖学明魏廷祥顾忠苏马建萍韩咏华
Owner 青海中信国安科技发展有限公司
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