Potassium fluoroborate preparation method

A technology of potassium fluoborate and fluoboric acid solution, which is applied in the field of potassium fluoborate and magnesium, can solve the problems of high production cost and high price of hydrofluoric acid, and achieve the effect of low cost

Inactive Publication Date: 2017-08-29
达州励志环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high price of hydrofluoric acid, the production cost of preparing potassium fluoroborate by traditional production process is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] The invention provides a kind of preparation method of potassium fluoroborate, comprising the following steps:

[0024] a), fluosilicic acid and boric acid are reacted in water according to the molar ratio (0.5-0.8): (0.8-1.5), to obtain fluoboric acid liquid;

[0025] The temperature of the reaction is 70-90°C; the time of the reaction is 1.5-3h;

[0026] b) Fluoroboric acid solution and potassium hydroxide are mixed and reacted to obtain potassium fluoborate.

[0027] In the present invention, first, fluosilicic acid and boric acid are reacted in water. Wherein, the molar ratio of fluosilicic acid to boric acid is (0.5-0.8):(0.8-1.5), preferably 0.58-0.73):(0.87-1.3); the reaction temperature is 70-90°C, preferably 75-85°C; the reaction time is 1.5-3 hours, preferably 2-2.5 hours. After the reaction is finished, a reaction liquid containing fluoroboric acid is obtained. The reaction solution is preferably subjected to solid-liquid separation to obtain a fluorobori...

Embodiment 1

[0036] Add 400g of 20.9wt% fluosilicic acid and 90g of 60wt% boric acid into a plastic beaker and stir with a plastic rod; then put the beaker into a constant temperature water bath at 85°C and start to heat up. When the temperature rises to 75°C, start timing the reaction for 2 hours; After 2 hours of reaction time, the plastic beaker was withdrawn from the water bath, and the temperature was lowered to 70°C to start filtering. Add 35g of potassium hydroxide to the obtained filtrate, stir evenly, and react for 10 minutes by timing; then filter to obtain potassium fluoroborate filter cake, filter Obtain 26.95g finished product through weighing after cake drying.

[0037] The finished product is analyzed by an infrared spectrometer, and the obtained spectrogram is compared with the infrared spectrogram of the potassium fluoroborate standard sample. The curves of the spectrograms are consistent, indicating that the finished product prepared by the present invention is potassium f...

Embodiment 2

[0041] Add 500g of 20.9wt% fluosilicic acid and 90g of 60wt% boric acid into a plastic beaker and stir with a plastic rod; then put the beaker into a constant temperature water bath at 85°C and start to heat up. When the temperature rises to 75°C, start timing the reaction for 2 hours; After 2 hours of reaction time, remove the plastic beaker from the water bath, let it cool down to 70°C and start filtering, add 45g of potassium hydroxide to the obtained filtrate, stir evenly, and time the reaction for 10 minutes; then filter to obtain potassium fluoroborate filter cake, filter Obtain 21.03g finished product through weighing after cake drying.

[0042] The finished product is acidified to obtain a boric acid solution; then the boric acid content in the boric acid solution is detected by acid-base titration, and the content of potassium fluoborate in the finished product is calculated according to the detected boric acid content, and the result is: Potassium fluoroborate conten...

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Abstract

The present invention belongs to the field of potassium magnesium fluoroborate and, and particularly relates to a potassium fluoroborate preparation method. The potassium fluoroborate preparation method comprises: a) carrying out a reaction on fluorosilicic acid and boric acid in water according to a molar ratio of (0.5-0.8):(0.8-1.5) to obtain a fluoroboric acid solution, wherein the reaction temperature is 70-90 DEG C, and the reaction time is 1.5-3 h; and b) carrying out a mixing reaction on the fluoroboric acid solution and potassium hydroxide to obtain potassium fluoroborate. According to the present invention, hydrofluoric acid used in the conventional production process is replaced with fluorosilicic acid as the raw material for potassium fluoroborate preparation, wherein the price of fluorosilicic acid is lower than the price of hydrofluoric acid, such that the cost of the method of the present invention is low; and the experiment results show that the yield is more than 60% when the potassium fluoroborate product with the purity of more than 95% is prepared by using the method of the present invention.

Description

technical field [0001] The invention belongs to the field of potassium magnesium fluoroborate, and in particular relates to a preparation method of potassium fluoroborate. Background technique [0002] Potassium fluoroborate is a colorless flaky crystal, which can be decomposed into boron trifluoride by strong acid. Slightly soluble in water, ethanol and ether, insoluble in alkali solution. The relative density (d20) is 2.498, the melting point is 530°C, and it is poisonous. It is mainly used in the production of aluminum-titanium-boron alloys, or as a flux for heat welding and brazing, or as an abrasive for the production of aluminum-magnesium casting, as a raw material for making boron trifluoride and other fluorine salts, and for electrochemical processes and Reagent for chemical research, catalyst for polypropylene synthesis. [0003] At present, the traditional production process of potassium fluoborate is to first react hydrofluoric acid and boric acid to generate f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/06
CPCC01B35/066C01P2006/80
Inventor 刘泽君
Owner 达州励志环保科技有限公司
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