Hydrothermal purification method of lithium tetraborate

A lithium tetraborate and purification method technology, applied in the directions of tetrafluoroboric acid, borates, boron oxide compounds, etc., can solve the problems of unsatisfactory purification effect, complicated process and high cost, and achieve large-scale, simple process, high cost, etc. Install simple effects

Inactive Publication Date: 2015-05-13
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The object of the present invention is to provide a lithium tetraborate hydrothermal purification method, which saves the preparation process of lithium tetraborate dissolution and supersaturated solution, and does not need stirring and condensation reflux, which simplifies the process flow and simple and easy equipment operation, and can be mass-produced, effectively solving the technical problems of the existing purification method with complex process, high cost and unsatisfactory purification effect, which can greatly reduce the production cost and has a good industrialization prospect

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  • Hydrothermal purification method of lithium tetraborate
  • Hydrothermal purification method of lithium tetraborate

Examples

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Effect test

Embodiment 1

[0039] Mix 2.5 g of commercial anhydrous lithium tetraborate solid and 47.5 g of deionized lithium tetraborate, add it to a hydrothermal reaction kettle, conduct a hydrothermal reaction at 100°C for 2 hours, take it out and cool it down to room temperature naturally. The solid-liquid was separated, and dried at 100° C. to obtain 1.3 g of purified lithium tetraborate trihydrate, with a yield of 48%. The obtained purified lithium tetraborate was detected, and the results are shown in Table 2:

[0040] Table 2 Chemical composition and impurity content in the purified lithium tetraborate of Example 1

[0041] Test items

Embodiment 2

[0043] Mix 7.5 g of commercial anhydrous lithium tetraborate solids with 42.5 g of deionized lithium tetraborate, add it to a hydrothermal reaction kettle, conduct a hydrothermal reaction at 120°C for 5 hours, take it out and cool it down to room temperature naturally. The solid-liquid was separated, and dried at 150°C to obtain 8.2 g of purified lithium tetraborate trihydrate, with a yield of 82%. The obtained purified lithium tetraborate was detected, and the results are shown in Table 3:

[0044] Table 3 Chemical composition and impurity content in the purified lithium tetraborate of Example 2

[0045] Test items

Embodiment 3

[0047] Mix 15 g of commercial anhydrous lithium tetraborate solid with 35 g of deionized lithium tetraborate, add it to a hydrothermal reaction kettle, conduct a hydrothermal reaction at 140°C for 10 hours, take it out and cool it down to room temperature naturally. The solid-liquid was separated, and dried at 180°C to obtain 18.1 g of purified lithium tetraborate trihydrate, with a yield of 92%. The obtained purified lithium tetraborate was detected, and the results are shown in Table 4:

[0048] Table 4 Example 3 Chemical composition and impurity content in the purified lithium tetraborate

[0049] Test items

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Abstract

The invention discloses a hydrothermal purification method of lithium tetraborate. The method comprises the following steps: (1) mixing commercial anhydrous lithium tetraborate with deionized water at the ratio; (2) packing the mixed sample into a hydrothermal reaction kettle, and sealing at a constant temperature of 90-200 DEG C for 1-12 hours; and (3) naturally cooling, carrying out solid-liquid separation, washing and drying a solid-phase material to obtain purified lithium tetraborate, and returning a liquid phase to the hydrothermal reaction kettle to use in cycle, or discharging the liquid phase according to the purity requirements. According to the hydrothermal purification method, the processes of dissolving lithium tetraborate and preparing a supersaturated solution are omitted; stirring and reflux condensation are not needed; the technological process is simplified; equipment is simple and easy to operate; volume production can be carried out; the technical problems that an existing purification method is complicated, low in cost, not ideal in purification effect and the like are effectively solved; the production cost can be greatly reduced; and the hydrothermal purification method has a relatively good industrial prospect.

Description

technical field [0001] The invention belongs to the technical field of purification of chemical products, in particular, the invention relates to a hydrothermal purification method of lithium tetraborate. Background technique [0002] Currently commercially available analytically pure lithium tetraborate (Li 2 B 4 o 7 ), the synthesis method generally adopts a certain proportion of lithium hydroxide and boric acid to mix, heat, dissolve and crystallize or even evaporate to dryness to obtain anhydrous lithium tetraborate solid, because lithium hydroxide is difficult to purify, and excessive lithium hydroxide will enter commercial lithium tetraborate Among them, the purity of lithium tetraborate is not high, which cannot meet the requirements of scientific research and industrial application. The chemical analysis of commercial lithium tetraborate shows that lithium oxide (Li 2 O) and boron trioxide (B 2 o 3 )) The molar ratio is about 1:1.85 (theoretical ratio is 1:2.00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/12
CPCC01B35/066
Inventor 戈海文房艳房春晖周永全朱发岩刘红艳孙鹏超苗军涛
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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