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Method for preparing potassium fluoborate

A technology of potassium fluoroborate and boric acid, which is applied in the field of preparation of potassium fluoroborate and potassium fluoroborate, can solve the problems of lack of market competitiveness of potassium fluoroborate, low added value and high cost of anhydrous hydrofluoric acid, and achieve good economy Benefits, reduced production costs, and simple reaction conditions

Inactive Publication Date: 2009-04-01
上海明煌实业发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Potassium fluoroborate is prepared in the prior art. Generally, potassium fluoroborate is prepared by anhydrous hydrofluoric acid method, and hydrofluoric acid, potassium carbonate or potassium hydroxide with high market price are used, which has high cost and low added value of anhydrous hydrofluoric acid. Potassium fluoroborate lacks market competitiveness

Method used

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  • Method for preparing potassium fluoborate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] According to HG / T2832-1997, the content of fluosilicic acid in the waste fluosilicic acid (Zhejiang Zhongying Group Co., Ltd.) is 34.2%, and the content of hydrofluoric acid is 8.6%. Then weigh 150g of fluosilicic acid, add 43.5g of boric acid, stir and heat in a water bath , the temperature was controlled at 60°C for two hours, filtered and washed until neutral to obtain SiO 2 85.4g. Weigh 57g of potassium chloride and dissolve it in 140g of water, and heat until it is completely dissolved, then add it into the mother liquor, stir, and control the temperature at 60°C. Bake in a circulating oven for 4 hours, weigh 76.26g, the content is 98.16%, and the yield is 87.0%.

Embodiment 2

[0026] Through HG / T2832-1997, the content of fluosilicic acid in waste fluosilicic acid (Zhejiang Zhongying Group Co., Ltd.) is 41.5%, and the content of fluoboric acid is 0.5%. Then, 150g of fluosilicic acid is weighed, and 41g of boric acid is added, stirred and heated in a water bath. Control 30°C, react for 2 hours, suction filter and wash until neutral to obtain SiO 2 103.6g, weigh 54g of potassium chloride, dissolve it in 130g of water, heat it to dissolve completely, add it to the mother liquor, control the temperature at 95°C, after the reaction is complete, filter with suction and wash until neutral to obtain 76.15g of potassium fluoroborate, put it in an oven at 100°C Middle baked for 4 hours, weighed 70.8g, the content was 98.06%, and the yield was 85.6%.

Embodiment 3

[0028] According to MG / T 2832-1997, the content of fluosilicic acid in fluosilicic acid (Zhejiang Zhongying Group Co., Ltd.) is 48.2%. The content of hydrofluoric acid is 1.3%, then weigh 150g of fluosilicic acid, add 48.2g of boric acid, stir and heat in a water bath, control the temperature at 95°C, react for 2 hours, filter and wash to obtain neutral SiO 2 120g, about 64g of potassium chloride was dissolved in 160g of water. Heat it until it is completely dissolved and add it to the mother liquor. The temperature was controlled at 30°C. After the reaction was completed, 90g of potassium fluoroborate was obtained by suction filtration and washing to neutrality, and 83.7g was weighed in a circulating oven at 100°C for 4 hours, the content was 98.12%, and the yield was 85.6%.

[0029] After the above process, the fluorine and silicon in the waste fluosilicic acid of hydrofluoric acid manufacturers are converted into potassium fluoborate and silicon dioxide with higher added ...

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Abstract

The invention provides a method for preparing potassium tetrafluoroborate, comprising the steps as follows: a. fluosilicic acid content of fluosilicic waste material is gained by chemical analysis of the fluosilicic waste material; boric acid with suitable quantity is added to the fluosilicic waste material so as to carry out the reaction under the reaction temperature of 30-95 DEG C; preferably, the reaction temperature is 60 DEG C; when the reaction is completed, SiO2 solid and mother liquor are gained by centrifugation; b. KCl with suitable quantity is added in the mother liquor so as to carry out the reaction with the reaction temperature of 90-95 DEG C; preferably, the temperature is 60 DEG C; when the reaction is completed, the potassium tetrafluoroborate solid and centrifugal liquid are gained by centrifugation; the potassium tetrafluoroborate solid is dried; c. the centrifugal liquid is exhausted after being counteracted. The method for preparing the potassium tetrafluoroborate greatly reduces the production cost and has good economical benefits and environmental protection.

Description

technical field [0001] The invention relates to the technical field of potassium fluoroborate, in particular to a production process of potassium fluoroborate, in particular to a method for preparing potassium fluoroborate. Background technique [0002] Potassium fluoroborate, molecular formula KBF 4 , mainly used as abrasives for thermosetting resin grinding wheels, raw materials for aluminum-magnesium casting to produce boron-containing alloys, flux for heat welding and brazing, raw materials for preparing boron trifluoride and other fluorine salts, analytical reagents for electrochemical synthesis, etc. In addition, it is also used in low-chromic acid chromium plating and lead-tin alloy electrolyte, as well as welding and fusion of silver, gold, stainless steel, etc. Potassium fluoroborate is prepared in the prior art, generally adopting anhydrous hydrofluoric acid method to prepare potassium fluoroborate, using hydrofluoric acid, potassium carbonate or potassium hydroxi...

Claims

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Application Information

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IPC IPC(8): C01B35/06
Inventor 张艳梅
Owner 上海明煌实业发展有限公司
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