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Production process for preparing low-silicon ammonium bifluoride by taking fluosilicic acid as raw material

A kind of ammonium bifluoride and production process technology, which is applied in the field of production process for the preparation of low-silicon ammonium bifluoride, which can solve the problems of not meeting the requirements of ammonium bifluoride reagent grade products, not mentioning the desiliconization treatment of ammonium fluoride raw materials, and the difficulty of thorough reaction, etc. Problems, to achieve the effect of increasing the economic benefits of products, improving the production environment, and promoting the value

Pending Publication Date: 2020-10-13
承德莹科精细化工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (3) It can corrode glass and is corrosive to skin
[0010] The following problems exist in the production of ammonium bifluoride products with by-product fluosilicic acid: because the ammoniation reaction (1) of fluosilicic acid is a reversible reaction, the reaction is difficult to carry out completely, and even in the case of excess ammonia, some fluorine remains in the reaction solution. ammonium silicate
However, the patent does not mention how to desilicate the ammonium fluoride raw material, and the content of fluorosilicate in the target product of the patent is 0.6%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take 800g of 40% fluosilicic acid solution, put it into a 3-liter beaker, add water to dilute to 20%; then add 20% ammonia water dropwise while stirring, and raise the temperature to 50 degrees by the heat of reaction and keep it; Reaction (1) 110% ammoniacal liquor of theoretically calculated amount, after reaction finishes and continue to stir for 20 minutes, filter out precipitated silicon dioxide, obtain ammonium fluoride solution; Its ammonium fluorosilicate content of gained ammonium fluoride filtrate detection is 0.53%, takes Concentrate and crystallize part of the ammonium bifluoride product to obtain ammonium fluorosilicate with a content of 1.58%, which exceeds the content requirement of the first-grade product in the product standard.

Embodiment 2

[0037]Get 800 grams of the ammonium fluoride solution obtained in Example 1, then add 120 g of 30% potassium fluoride in excess of 1.3 times according to the calculation of the residual ammonium fluorosilicate content according to reaction (2), add the solution dropwise under stirring, and then stir after adding 60 minutes, then the precipitate was separated by microfiltration. The obtained ammonium fluoride clear liquid is concentrated and crystallized to obtain an ammonium bifluoride product, and its ammonium fluorosilicate content is detected to be 0.16%, reaching the ammonium bifluoride reagent grade product standard, and the fluorosilicate content of the ammonium bifluoride product is lower than 0.2%.

Embodiment 3

[0039] Get 800 grams of the ammonium fluoride solution obtained in Example 1, then add 31 grams of sodium fluoride in an excess of 1.5 times according to the calculation of the residual ammonium fluorosilicate content according to reaction (2), and then stir for 180 minutes after adding, and then separate the precipitate . Concentrate and crystallize the ammonium fluoride obtained overnight to obtain ammonium bifluoride product. Its ammonium fluorosilicate content was detected to be 0.19%. Reach the ammonium bifluoride reagent grade product standard, the fluorosilicate content of ammonium bifluoride products is less than 0.2%.

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PUM

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Abstract

The invention discloses a production process for preparing low-silicon ammonium bifluoride by using fluosilicic acid as a raw material, which comprises the following steps: by using a fluosilicic acidsolution as a raw material, carrying out ammoniation desilicication and filtration to obtain an ammonium fluoride primary solution; and then adding a desilicication agent into the ammonium fluoride primary solution to carry out secondary desilicication, and then filtering, concentrating and crystallizing to obtain an ammonium hydrogen fluoride product. The content of fluosilicic acid radicals inthe ammonium bifluoride product is lower than 0.2%, and the application value of the byproduct fluosilicic acid is greatly improved.

Description

technical field [0001] The invention relates to the technical field of ammonium bifluoride production, in particular to a production process for preparing low-silicon ammonium bifluoride using fluosilicic acid as a raw material. Background technique [0002] Ammonium bifluoride is white or colorless transparent orthorhombic crystals. The product is in the form of flakes with a slightly sour taste. The relative density is 1.52. The melting point is 125.6°C and the boiling point is 240°C. It has broad application prospects, including the following inventions: [0003] (1) Used as a glass etchant, disinfectant, preservative, solvent for metal beryllium, surface treatment agent for silicon steel plates, and also used in the manufacture of ceramics and magnesium alloys. It can be used as a chemical reagent, a glass etchant (often used together with hydrofluoric acid), a disinfectant and antiseptic in the fermentation industry, a solvent for making metal beryllium from beryllium ...

Claims

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Application Information

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IPC IPC(8): C01C1/16
CPCC01C1/162C01P2006/80
Inventor 宁延生林玉果朱建平郭西凤张福刘兰波杨玉田杨贤王阔
Owner 承德莹科精细化工股份有限公司
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