Method for combined extracting boron, magnesium and lithium from salt lake bittern

A technology of combined extraction and salt lake brine, which is applied in the fields of lithium, boron and magnesium, can solve the problems of lithium carbonate containing many impurities, low resin utilization rate, uneconomical and other problems, and achieve good filtration and washing performance and system flow rate The effect of small size and energy saving in production

Inactive Publication Date: 2007-08-29
WESTERN MINING GROUP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The feature of this method is that no additional chemical reagents are needed for the separation of magnesium and lithium, but the energy consumption is high, the recovery rate of lithium is low, and the lithium carbonate produced contains many impurities; the magnesium hydroxide obtained by the hydration of magnesium oxide has very poor filtration and washing performance. Moreover, it contains a large amount of boron; it should be pointed out that 100 tons of low-concentration hydrochloric acid should be produced as a by-product for every 1 ton of lithium carbonate produced. If the place of origin cannot digest it, it will be very difficult to store and transport; (2) Carbonate precipitation method (2) Industrial soda ash Na 2 CO 3 When added to brine, the following reaction occurs: Na 2 CO 3 +2Li + -Li 2 CO 3 ↓+2Na + This method is used to extract lithium salt (Li 2 CO 3 ), this method is not suitable for the brine with high ratio of magnesium to lithium, because it is very uneconomical to remove magnesium with a large amount of soda ash before extracting lithium; (3) the adsorption method utilizes artificial resin to directly add in the brine to absorb Li + , the resin utilization rate of this method is low, and the adsorption effect is lost after only 2 to 3 times, so this method is not economical, and large-scale production is still a problem; (

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  • Method for combined extracting boron, magnesium and lithium from salt lake bittern

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Embodiment 1

[0041] (1) Use brine near saturated magnesium chloride after evaporation and concentration of salt fields to remove most of the sodium and potassium as raw material, wherein the content of diboron trioxide is 2-4%, the concentration of magnesium ions is about 80-120g / L, and the concentration of lithium ions is about 3-4%. 8g / L; purification of raw brine

[0042] (2) With the raw material brine containing boron, magnesium, lithium, remove impurities such as silt and other solid suspended matter by filter press filter, make raw material brine be purified;

[0043] (3) Sulfuric acid or hydrochloric acid method for boric acid

[0044] In an enamel reactor with an effective volume of 10000L, add 9m 3 The purified brine is heated, and when heated to a temperature of 55°C, slowly add 180 L of concentrated sulfuric acid, stirring while adding, and continue stirring for about 1 hour after the addition, and then cooling. When cooled to 15°C, filter and separate with a centrifuge or a ...

Embodiment 2

[0058] (1) Use brine near saturated magnesium chloride after evaporation and concentration of salt fields to remove most of the sodium and potassium as raw material, wherein the content of diboron trioxide is 2-4%, the concentration of magnesium ions is about 80-120g / L, and the concentration of lithium ions is about 3-4%. 8g / L; purification of raw brine

[0059] (2) With the raw material brine containing boron, magnesium, lithium, remove impurities such as silt and other solid suspended matter by filter press filter, make raw material brine be purified;

[0060] (3) Sulfuric acid or hydrochloric acid method for boric acid

[0061] In an enamel reactor with an effective volume of 10000L, add 9m 3 Heating the raw material brine after purification, when the temperature is 60°C, slowly add 1000L concentrated hydrochloric acid, stirring while adding, continue stirring for about 0.5 hours after adding, and then cooling. When cooled to 0°C, use a centrifuge or a filter press to fil...

Embodiment 3

[0075] (1) Use brine near saturated magnesium chloride after evaporation and concentration of salt fields to remove most of the sodium and potassium as raw material, wherein the content of diboron trioxide is 2-4%, the concentration of magnesium ions is about 80-120g / L, and the concentration of lithium ions is about 3-4%. 8g / L; purification of raw brine

[0076](2) With the raw material brine containing boron, magnesium, lithium, remove impurities such as silt and other solid suspended matter by filter press filter, make raw material brine be purified;

[0077] (3) Sulfuric acid or hydrochloric acid method for boric acid

[0078] In an enamel reactor with an effective volume of 10000L, add 9m 3 Heating the raw material brine after purification, when the temperature is 65°C, slowly add 250L of concentrated sulfuric acid, stirring while adding, continue stirring for about 0.5 hours after adding, and then cooling. When cooled to -5°C, use a centrifuge or a filter press to filte...

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Abstract

The invention relates to salt lake resource developing and comprehensive utilization. It uses boron, magnesium and lithium bittern as raw material, adopting combination distilling technology to make boric acid, magnesium hydroxide, lithium carbonate, and ammonium chloride. The recycling ratio of boron, magnesium and lithium reach 87%, 95%, and 92%. It has the advantages of simple technology, little device investment, high utilization coefficient of resource, high yield, good product quality, low producing cost and no pollution.

Description

technical field [0001] The present invention relates to the development and comprehensive utilization of salt lake resources, in particular to a kind of salt lake brine containing boron, magnesium, and lithium as raw materials, and adopts a combined separation and extraction process to prepare boric acid, magnesium hydroxide, lithium carbonate, and ammonium chloride respectively. A method for jointly extracting boron, magnesium and lithium from salt lake brine. Background technique [0002] my country is a country rich in salt lake resources. According to incomplete statistics, the area is greater than 1km 2 There are 813 inland salt lakes in China. Among them, there are 234 in Tibet, 71 in Qinghai, 375 in Inner Mongolia, and the rest are scattered in Jilin, Hebei, Shaanxi, Ningxia, Gansu and other provinces. Among the salt lake resources, potassium, sodium, magnesium, lithium, and boron are the most abundant resources. The reserves of potassium, sodium, magnesium, lithiu...

Claims

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Application Information

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IPC IPC(8): C01D15/08C01F5/14C01B35/10C01B21/09
Inventor 徐徽毛小兵李增荣石西昌庞全世陈白珍杨喜云王华伟
Owner WESTERN MINING GROUP
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