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Process for purifying lithium tetraborate

A purification method, lithium tetraborate technology, which is applied in the direction of borates, boron oxide compounds, etc., can solve the problem that lithium tetraborate aqueous solution is supersaturated and difficult to purify, and achieves the effects of easy operation, simple purification process and low process investment

Inactive Publication Date: 2002-08-14
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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Problems solved by technology

[0008] The purpose of the present invention is exactly to purify commercially available lithium tetraborate, provide a set of lithium tetraborate purification method, solve the difficult problem that the supersaturation of lithium tetraborate aqueous solution is not easy to purify, make industrially produced high-purity lithium tetraborate become possible

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  • Process for purifying lithium tetraborate
  • Process for purifying lithium tetraborate

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Embodiment 1

[0019] Embodiment 1, use commercially available lithium tetraborate (purity is 98.5%) with deionized water (conductivity is less than 1 * 10 -4 s.m. -1 ) is heated and dissolved, and prepared into a supersaturated aqueous solution with a mass concentration of 11% as a purified raw material liquid; the raw material liquid is placed in a heating reflux device, and heated to reflux under stirring conditions;

[0020]1.1 After heating and refluxing for 3 hours, separate the solid and liquid by filtration, and dry the solid phase naturally to obtain purified lithium tetraborate trihydrate. The detection and analysis results are: the recovery rate of lithium tetraborate is 45%, and the purity is 99.16%.

[0021] 1.2 After heating and refluxing for 5 hours, separate the solid and liquid by filtration, and dry the solid phase at 80°C to obtain purified lithium tetraborate trihydrate. The detection and analysis results are: the recovery rate of lithium tetraborate is 50%, and the purit...

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Abstract

A process for purifying lithium tetraborate including preparing 11-25 mass% over-saturated aqueous solution of lithium tetraborate, thermal reflux for 2-5 hr while stirring, solid-liquid separation and drying solid-phase substance. Its advantages include simple process and no environmental pollution.

Description

technical field [0001] The invention belongs to a method for purifying lithium tetraborate, and relates to the technical field of inorganic chemistry. Background technique [0002] Currently commercially available lithium tetraborate (Li 2 B 4 o 7 ) is an analytically pure reagent produced by Beijing Xinhua Reagent Factory, and its chemical analysis shows that lithium oxide (Li 2 O) and boron trioxide (B 2 o 3 ) molar ratio is 1:1.89, and theoretically the ratio of the two should be 1:2.00, it can be seen that Li 2 The content of O is relatively high, and high-purity lithium tetraborate products and reagents are not available in the market at present. Lithium tetraborate is an excellent piezoelectric material for mobile communications; its single crystal is also a good optical material. Improving the purity of lithium tetraborate is very important to improve the performance of materials; at the same time, the research on the physical and chemical properties, crystal s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/12
Inventor 张爱芸姚燕李丽娟宋彭生
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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