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Preparation method of ammonium fluoride

A technology of ammonium fluoride and silicon fluoride, which is applied in the direction of ammonium fluoride and ammonium halide, can solve the problems of high energy consumption and serious environmental pollution in mother liquor treatment, and achieve the effect of reducing pollution, advanced technology and easy realization

Inactive Publication Date: 2018-06-26
QINGDAO XIANGZHI ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This production method usually causes more hydrofluoric acid and ammonia to be contained in the air, causing serious environmental pollution, and the mother liquor treatment consumes a lot of energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A preparation method for ammonium fluoride, comprising the following steps:

[0015] Decomposition of albite: first preheat albite and fluorite at 100°C for about 30 minutes, then add 98% sulfuric acid to react the three at 100°C and autogenous pressure for about 5 hours to obtain solid residue and fluoride-containing Gas products of silicon, among which, the mass ratio of albite, fluorite, and 98% sulfuric acid is 1:1.55:3.28, and the reaction principle is:

[0016] CaF2+H2SO4=2HF+CaSO4

[0017] 2NaAlSi3O8+24HF+4H2SO4=Na2SO4+Al2(SO4)3+6SiF4↑+16H2O

[0018] Gas absorption hydrolysis: introduce the above-mentioned gas product containing silicon fluoride into the dust removal filter to remove dust; the gas filtered by dust removal is passed into the primary absorption tower for hydrolysis to form hydrolyzate, and the hydrolyzate enters the primary dense phase collection tank , the dense phase collected by the first-level dense phase collection tank is transported to the...

Embodiment 2

[0024] A preparation method for ammonium fluoride, comprising the following steps:

[0025] Decomposition of albite: the specific implementation of this step in this embodiment is basically the same as that of the decomposition of albite in Example 1, the difference is that the preheating temperature is 150°C, and the preheating time is 20 minutes; the reaction temperature is 150°C, and the reaction time is 3.5 hours; wherein, the mass ratio of albite, fluorite, and 98% sulfuric acid is 1:2:4;

[0026] Gas absorption hydrolysis: the specific implementation of this step in this embodiment is basically the same as the implementation of the gas absorption hydrolysis step in Example 1, except that the absorption liquid is an aqueous ethanol solution with a concentration of about 20%;

[0027] Ammonolysis: at about 40°C, adjust the pH to 7.5 with ammonia water for the dense phase and fluosilicic acid liquid entering the ammonolysis kettle; after neutralization, age at about 35°C fo...

Embodiment 3

[0030] A preparation method for ammonium fluoride, comprising the following steps:

[0031] Decomposition of albite: the specific implementation of this step in this embodiment is basically the same as that of the decomposition of albite in Example 1, the difference is that the preheating temperature is 200°C, and the preheating time is 15 minutes; the reaction temperature is 200°C, and the reaction time is 2 hours; wherein, the mass ratio of albite, fluorite, and 98% sulfuric acid is 1:2.5:4.6;

[0032] Gas absorption hydrolysis: the specific implementation of this step in this embodiment is basically the same as the implementation of the gas absorption hydrolysis step in Example 1, except that the absorption liquid is an aqueous ethanol solution with a concentration of about 30%;

[0033] Ammonolysis: at about 30°C, adjust the pH to 7.9 with ammonia water for the dense phase and fluosilicic acid liquid entering the ammonolysis kettle; after neutralization, age at about 30°C ...

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PUM

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Abstract

The invention provides a preparation method of ammonium fluoride. The preparation method comprises that silicon fluoride-containing gas generated by a sodium feldspar decomposition reaction is fed into an absorption tower and undergoes a hydrolysis reaction to produce a fluorosilicic acid solution, the fluorosilicic acid solution is added into an aminolysis reactor and undergoes an aminolysis reaction to produce a solution containing ammonium fluoride and white carbon black, the solution containing ammonium fluoride and white carbon black is filtered, the filtrate is concentrated and crystallized in a crystallization reactor and the crystals are filtered and dried to form the ammonium fluoride finished products. The preparation method is easy to operate, is economic and feasible and prevents the environmental pollution.

Description

technical field [0001] The invention relates to a method for preparing ammonium fluoride, in particular to a method for preparing ammonium fluoride by using albite. Background technique [0002] Ammonium fluoride, the molecular formula is NH4F, the relative molecular mass is 37.04, the relative density is 1.015 (25°C), colorless leaf-like or needle-like crystals, and becomes hexagonal columnar crystals after sublimation; it is easy to deliquesce and agglomerate, soluble in cold water, slightly soluble In alcohol, insoluble in acetone and liquid ammonia. It decomposes and loses ammonia when it is heated or meets hot water, and transforms into more stable ammonium fluoride. Ammonium fluoride is widely used, such as glass etchant, chemical polishing agent on metal surface, wood and wine preservative, disinfectant, fiber mordant and solvent for extracting rare elements, etc. Masking agent, wine-making disinfectant, preservative, fiber mordant, etc. [0003] The traditional pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/16
CPCC01C1/162
Inventor 李辉
Owner QINGDAO XIANGZHI ELECTRONICS TECH CO LTD
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