Preparation method of anhydrous lithium metaborate

A technology of lithium metaborate and boric acid, which is applied in the field of preparation of anhydrous lithium metaborate, can solve the problems of strict process and equipment material requirements, deep processing, etc., and achieve the effect of convenient and safe industrial production, reducing energy consumption and improving utilization rate

Active Publication Date: 2013-02-06
HUBEI BAIJIERUI ADVANCED MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the complex and cumbersome process of the existing process, the strict requirements on the process and equipment materials, and the final product still needs deep processi...

Method used

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  • Preparation method of anhydrous lithium metaborate
  • Preparation method of anhydrous lithium metaborate
  • Preparation method of anhydrous lithium metaborate

Examples

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Embodiment 1

[0026] A preparation method of anhydrous lithium metaborate, the steps are as follows:

[0027] 1. Purification of raw materials: dissolve 5Kg lithium hydroxide monohydrate with 20Kg boiled pure water and then filter while hot until clarified to obtain lithium hydroxide net liquid; dissolve 7Kg boric acid with 7Kg boiled pure water and then filter while hot until clarified. Obtain boric acid clean solution;

[0028] 2. Neutralization ingredients: add 13.25Kg boric acid net liquid to the filtered 25Kg lithium hydroxide net liquid while hot (wherein the amount of boric acid substance in the boric acid net liquid is 90% of the amount of lithium hydroxide substance in the lithium hydroxide net liquid %) neutralization, keep the reaction temperature ≧70°C, stir for 15 minutes under heat preservation to make the reaction fully, and prepare for centrifugation immediately after settling for 20 minutes;

[0029] 3. Centrifugal separation: Separation temperature ≧ 50°C, centrifuge spee...

Embodiment 2

[0036] A preparation method of anhydrous lithium metaborate, the steps are as follows:

[0037] 1. Raw material purification: Dissolve 5Kg lithium hydroxide monohydrate with 20Kg boiled pure water and then filter while hot until clarified to obtain lithium hydroxide net liquid; dissolve 7.2Kg boric acid with 7.2Kg boiled pure water and filter while hot to Clarify to obtain boric acid net liquid;

[0038] 2. Neutralization ingredients: add 14Kg boric acid net liquid to the filtered 25Kg lithium hydroxide net liquid while hot (wherein the amount of boric acid in the boric acid net liquid is 95% of the amount of lithium hydroxide in the lithium hydroxide net liquid ) for neutralization, keep the reaction temperature ≧70°C, stir for 15 minutes under heat preservation to make the reaction fully, and prepare for centrifugation immediately after settling for 20 minutes;

[0039] 3. Centrifugal separation: Separation temperature ≧ 50°C, centrifuge speed 1500r / min, separation time 20 ...

Embodiment 3

[0047] A preparation method of anhydrous lithium metaborate, the steps are as follows:

[0048] 1. Raw material purification: Dissolve 5Kg lithium hydroxide monohydrate with 20Kg boiled pure water and then filter while hot until clarified to obtain lithium hydroxide net liquid; dissolve 7.5Kg boric acid with 7.5Kg boiled pure water and then filter while hot to Clarify to obtain boric acid net liquid;

[0049] 2. Neutralization ingredients: Add 14.27Kg boric acid net liquid to the filtered 25Kg lithium hydroxide net liquid while it is hot (wherein the amount of boric acid in the boric acid net liquid is 97% of the amount of lithium hydroxide in the lithium hydroxide net liquid %) neutralization, keep the reaction temperature ≧70°C, stir for 15 minutes under heat preservation to make the reaction fully, and prepare for centrifugation immediately after settling for 20 minutes;

[0050] 3. Centrifugal separation: Separation temperature ≧ 50°C, centrifuge speed 1800r / min, separation...

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Abstract

The invention belongs to the technical field of preparation of inorganic compound lithium metaborate, and particularly discloses a preparation method of anhydrous lithium metaborate. The method comprises the following steps: dissolving lithium hydroxide in boiling water, and filtering to remove impurities; slowly adding boracic acid after being purified in hot lithium hydroxide solution, wherein the amount of boracic acid is slightly smaller than theoretical reacting weight; depositing so that the solution is cooled and crystallized to prepare lithium metaborate wet material; and then obtaining the finished product of anhydrous lithium metaborate through the steps of low-temperature primary drying, cracking, high-temperature secondary drying and the like. According to the method, lithium metaborate is prepared from lithium hydroxide and boracic acid through liquid phase reaction, the utilization rates of lithium hydroxide and boracic acid are improved, the yield coefficient of the system can reach more than 90%, the purity of the product can reach 99.99% and is higher than that of the product in the prior art, and the method is more suitable for the market requirements nowadays.

Description

technical field [0001] The invention relates to the technical field of preparation of inorganic compound lithium metaborate, in particular to a preparation method of anhydrous lithium metaborate. Background technique [0002] Lithium metaborate (LITHIUM METABORATE) is a melting flux for sample preparation, suitable for wavelength dispersive XRF fluorescence spectrometer, AA atomic absorption and ICP sample preparation. Its main function is to mix with lithium tetraborate in proportion to neutralize the acidity and alkalinity of different oxides to melt the sample, so that the corresponding molten glass sheet or solution can be obtained. And traditional synthetic method is to utilize Lithium Carbonate and boric acid reaction to make lithium metaborate, and reaction is: [0003] Li 2 CO 3 +2H 3 BO 3 =2LiBO 2 +3H 2 O+CO 2 ↑ [0004] The process is to grind and mix lithium carbonate and boric acid at a molecular ratio of 1:2, and heat them in a high-temperature furnace ...

Claims

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Application Information

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IPC IPC(8): C01B35/12
Inventor 纪东海罗钊范黎李兴
Owner HUBEI BAIJIERUI ADVANCED MATERIALS
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