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A method of removing residue hydrogen fluoride in fluosilicic acid

A technology of fluorosilicic acid and hydrogen fluoride, which is applied in the chemical field, can solve the problems of increasing the production cost of lead electrolyte and the extra consumption of lead oxide, and achieve the effects of reducing dilution, reducing the amount of treatment, and saving the amount of treatment

Inactive Publication Date: 2014-06-18
济源市昊达实业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in industrial fluosilicic acid, the hydrofluoric acid produced during the placement process or the heating process reacts with the lead ions produced by dissolution to form insoluble PbF 2 Precipitation, these side reactions lead to additional consumption of the amount of lead oxide
Since the lead oxide needed to configure the lead electrolyte is more expensive, the side reaction between the residual hydrogen fluoride and lead oxide greatly increases the production cost of the lead electrolyte

Method used

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  • A method of removing residue hydrogen fluoride in fluosilicic acid

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Embodiment 1

[0037] A method for removing residual hydrogen fluoride in fluosilicic acid, comprising the steps of:

[0038] 1) Using 1 kg of commercially available calcium carbonate, mill it in a ball mill containing agate grinding balls for 60 minutes to obtain calcium carbonate powder;

[0039] 2) Use a 320-mesh sieve to sieve the calcium carbonate powder obtained in step 1), take the fine powder that has been sun-dried, and return the calcium carbonate left on the sieve to the process of step 1) for ball milling. After multiple ball mills, the cumulative A total of 0.96 kg of calcium carbonate was obtained;

[0040] 3) The commercially available 10 liters of fluorosilicic acid with a concentration of 41% by weight was determined by chemical titration analysis, and the density was about 1.2g / L; the titration analysis showed that the content of fluorosilicic acid was 557.2g / L, hydrogen fluorine The acid content is 63.5g / L;

[0041]4) Add 600 grams of silica powder to the industrial fluo...

Embodiment 2

[0043] A method for removing residual hydrogen fluoride in fluosilicic acid, comprising the steps of:

[0044] 1) Using 1 kg of commercially available calcium carbonate, mill it in a ball mill containing agate grinding balls for 60 minutes to obtain calcium carbonate powder;

[0045] 2) Use a 320-mesh sieve to sieve the calcium carbonate powder obtained in step 1), take the fine powder that has been sun-dried, and return the calcium carbonate left on the sieve to the process of step 1) for ball milling. After multiple ball mills, the cumulative A total of 0.96 kg of calcium carbonate was obtained;

[0046] 3) Take 10 liters of industrial fluosilicic acid (such as produced by Haoda Industrial Co., Ltd.), and use the chemical titration method to analyze and measure the sample, showing that the content of fluosilicic acid is 557.8g / L, and the content of hydrofluoric acid is 54.7g / L;

[0047] 4) Add 500 grams of commercially available silica powder to the industrial fluosi...

Embodiment 3

[0053] A method for removing residual hydrogen fluoride in fluosilicic acid, comprising the steps of:

[0054] 1) Using 1 kg of commercially available calcium carbonate, mill it in a ball mill containing agate grinding balls for 60 minutes to obtain calcium carbonate powder;

[0055] 2) Use a 320-mesh sieve to sieve the calcium carbonate powder obtained in step 1), take the fine powder that has been sun-dried, and return the calcium carbonate left on the sieve to the process of step 1) for ball milling. After multiple ball mills, the cumulative A total of 0.96 kg of calcium carbonate was obtained;

[0056] 3) Take 10 liters of commercially available industrial fluosilicic acid, and use the chemical titration method to analyze the sample for the first time, showing that the content of fluosilicic acid is 557.4g / L, and the content of hydrofluoric acid is 55.3g / L;

[0057] 4) Add 500 grams of commercially available silica powder to industrial fluosilicic acid for the firs...

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Abstract

The invention discloses a method of removing residue hydrogen fluoride in fluosilicic acid. The method includes steps of: 1) adding silica into the fluosilicic acid, allowing the mixture to react and filtering to obtain a filtrate A; 2) adding fine carbonate powder into the filtrate A, allowing the mixture to react, and filtering to obtain a filtrate B; and 3) dissolving the fine carbonate powder into water to prepare a suspension, feeding carbon dioxide into the suspension to obtain a liquid bicarbonate solution, adding the liquid bicarbonate solution into the filtrate B, and allowing the mixture to react to obtain a fluosilicic acid solution. Beneficial effects of the method are that: 1) the pure fluosilicic acid solution is obtained by three stages of acid removal; 2) calcium carbonate refined by ball milling reduces the using amount of liquid calcium in the third stage, thus saving the processing amount the liquid calcium; 3) fluorinion in the solution is accurately removed and introduction of extra impurities is prevented; 4) the reaction capability and reaction speed are good; and 5) the removing efficiency of the residue fluorinion in the fluosilicic acid reaches over 95%, and the concentration of the residue fluorinion is reduced to be within 0.05 g / L.

Description

technical field [0001] The invention belongs to the technical field of chemistry, and in particular relates to a method for removing residual hydrogen fluoride in fluosilicic acid. Background technique [0002] Fluosilicic acid, also known as silicofluorohydrogen acid, is easily decomposed into silicon tetrafluoride and hydrogen fluoride. Its aqueous solution is colorless and shows a strong acid reaction. It is corrosive and can corrode glass. It can be stored in wax or plastic containers. When the concentrated solution is cooled, colorless dihydrate crystals are precipitated, with a melting point of 19°C. Fluorosilicic acid has disinfection properties and is used to make fluorosilicate and cryolite, as well as electroplating, beer disinfection, wood preservation, etc. It is made by dissolving silicon dioxide in hydrofluoric acid or mixing quartz powder, calcium fluoride and concentrated sulfuric acid and then heating. It can also be obtained by absorbing the silicon tetr...

Claims

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Application Information

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IPC IPC(8): C01B33/10
CPCY02P20/141
Inventor 李亮殷继沛潘军青梁达保李森波梁晶梁静杨萌
Owner 济源市昊达实业有限公司
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