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Method and device for preparing high-purity boric acid

A technology of high-purity boric acid and boric acid, which is applied in the direction of boron oxide compounds, etc., can solve the problems of complex preparation process and low purity of high-purity boric acid.

Inactive Publication Date: 2015-07-01
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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Problems solved by technology

[0004] Aiming at the current problems of low purity of high-purity boric acid and complex preparation process, the present invention designs a preparation method and device for high-purity boric acid. According to the different solubility of boric acid at different temperatures, the solubility of boric acid changes faster than that of impurities at the same time. principle, can produce >4N high-purity boric acid

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  • Method and device for preparing high-purity boric acid

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Embodiment 1

[0026] Embodiment 1 prepares the device of high-purity boric acid

[0027] Such as figure 1 As shown, the device for preparing high-purity boric acid includes a saturated solution premixer 1, a filter 7, a cation exchange column 2, an anion exchange column 3, an evaporation device 4, a cooling crystallization container 5 and a suction filtration drying device 6 connected in sequence. Water pumps are installed between the filter 7 and the cation exchange column 2 , between the cation exchange column 2 and the anion exchange column 3 , and between the anion exchange column 3 and the evaporator 4 .

Embodiment 2

[0028] Embodiment 2 prepares high-purity boric acid

[0029] The raw material is industrial-grade boric acid. Prepare 10L of saturated boric acid solution at 30°C. If there is obvious precipitation after dissolution, it needs to be filtered. First pass the prepared saturated boric acid solution through a cation exchange column, the inner diameter of the column is 30 mm, the height of the cation exchange resin in the column is 400 mm, and the filling material is the cation exchange resin produced by Zhejiang Zhengguang Industrial Co., Ltd. ℃. Pump the boric acid solution that has passed through the cation exchange column into the anion exchange column. The inner diameter of the column is 30mm, and the height of the anion exchange resin in the column is 400mm. The filling material is anion exchange resin produced by Zhejiang Zhengguang Industrial Co., Ltd. min, keep at 30°C. Then pump the boric acid solution that has passed through the anion exchange column into the evaporatio...

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Abstract

The invention discloses a method and device for preparing high-purity boric acid. The method comprises the steps of (1) ion exchange pretreatment, (2) evaporation re-crystallization purification and (3) suction filtration drying. According to the differences of the solubility of boric acid in an aqueous solution at different temperatures and a theory that the solubility of boric acid changes faster along with temperature changes than that of impurities, boric acid is purified. The method can adopt industrial boric acid as a raw material, and is easily-available in raw material, low in cost, simple in process step and convenient to operate.

Description

technical field [0001] The invention relates to a method and device for preparing high-purity boric acid, belonging to the technical field of inorganic chemical industry. Background technique [0002] my country is rich in boron resources, but limited by the grade of boron ore and preparation technology, the production of boric acid is still at the primary level. The boric acid finished product prepared by traditional technology has high impurity content, and the purity of boric acid can only reach the reagent standard. It is far from being able to meet the requirements of boric acid used in high-tech fields on purity and impurity indicators, resulting in a shortage of high-purity boric acid in my country and basically relying on imports. Therefore, it is of great significance to carry out research on the preparation technology and process of high-purity boric acid. [0003] At present, the production process of domestic boric acid is mostly flotation method, which has the p...

Claims

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Application Information

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IPC IPC(8): C01B35/10
Inventor 于丽敏蒋文全郭荣贵李涛张婧黄小卫胡运生
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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