A kind of preparation method of stannous fluoride

A technology of stannous fluoride and tin dioxide, applied in tin halide and other directions, can solve the problems of equipment corrosion, low productivity and low purity, and achieve the effects of easy low temperature condensation and solidification, easy high temperature volatilization, and low raw material cost.

Active Publication Date: 2017-06-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But adopting hydrofluoric acid to prepare stannous fluoride to obtain product productivity is low, and purity is not high, can be mixed with impurities such as a large amount of tin fluoride, adopt hydrofluoric acid in addition is highly toxic substance, in the production process to equipment corrosion serious, to serious threat to human health
[0005] (2) Ion exchange method, using stannous chloride and sodium fluoride as raw materials, the preparation principle is SnCl 2 +2NaF=SnF 2 +2NaCl, although this method is simple to operate, it is difficult to remove the residual sodium fluoride in the product, and the residual sodium chloride and sodium fluoride also reduces the use effect and efficiency of stannous fluoride
Although the method is simple to operate and the product has high purity, the price of metal tin powder and copper fluoride is high, and the requirements for raw material purity and particle size are relatively high.
[0007] In summary, the existing preparation of stannous fluoride generally has problems such as complicated process, high cost, low yield, and low product purity. method is very important

Method used

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  • A kind of preparation method of stannous fluoride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] To analyze pure SnO 2 (purity 99.5%), CaF 2 (purity 99.5%) and CMC as raw materials are respectively ground to -0.074mm particle size and the mass percentage is not less than 80%; the analytically pure SnO after pretreatment 2 , CaF 2 , CMC according to SnO 2 :CaF 2 : The molar ratio of CMC is 1:1:0.2 and mixed evenly; put the mixed powder material into CO and CO 2 Composition of the roasting atmosphere heating and roasting, the roasting temperature is 500 ° C, the roasting atmosphere is [CO / (CO+CO 2 )] is 50%, the roasting time is 60min, and the high-purity stannous fluoride product is recovered from its separation and recovery from the roasting tail gas smoke dust, and the analysis product SnF 2 The content is 96.7%, SnF 2 Yield 75.6%.

Embodiment 2

[0026] To analyze pure SnO 2 (purity 99.5%), CaF 2 (purity 99.5%) and CMC as raw materials are respectively ground to -0.074mm particle size and the mass percentage is not less than 80%; the analytically pure SnO after pretreatment 2 , CaF 2 , CMC according to SnO 2 :CaF 2 : The CMC molar ratio is 1:1.2:0.1 and mixed evenly; put the mixed powder material into CO and CO 2 Composition of the roasting atmosphere heating and roasting, the roasting temperature is 1000 ℃, the roasting atmosphere is [CO / (CO+CO 2 )] is 23%, the roasting time is 80min, and the high-purity stannous fluoride product is recovered from its separation and recovery from the roasting tail gas smoke dust, and the analysis product SnF 2 The content is 96.0%, SnF 2 Yield 85.6%.

Embodiment 3

[0028] To analyze pure SnO 2 (purity 99.5%), fluorite concentrate (CaF 2 Theoretical content 87.3%) and CMC as raw materials are respectively ground to -0.074mm particle size and the mass percentage is not less than 80%; the analytically pure SnO after pretreatment 2 , fluorite concentrate, CMC according to SnO 2 :CaF 2 : The CMC molar ratio is 1:1.2:0.13 and mixed evenly; put the mixed powder material into CO and CO 2 Composition of the roasting atmosphere heating and roasting, the roasting temperature is 750 ° C, the roasting atmosphere is [CO / (CO+CO 2 )] is 5%, the roasting time is 100min, and the high-purity stannous fluoride product is recovered from the roasting tail gas smoke dust, and the analysis product SnF2 96.2% pure, SnF 2 Yield 88.6%.

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Abstract

The invention discloses a preparation method of stannous fluoride.The method comprises the steps that a material containing tin dioxide, a material containing calcium fluoride and sodium carboxymethylcellulose are ground, smashed, mixed and then placed in a CO-CO2 mixed atmosphere to be calcined at the temperature of 500 DEG C-1,000 DEG C, and stannous fluoride is recycled from calcination flue gas.Compared with an existing stannous fluoride preparation technology, the method has the advantages that operation is easy, convenience and environmental protection are achieved, the cost is low, and prepared stannous fluoride is high in purity and low in impurity content.

Description

technical field [0001] The invention relates to a preparation method of stannous fluoride, belonging to the technical field of stannous fluoride preparation. Background technique [0002] Stannous fluoride (SnF 2 ) has a melting point of 215°C and a boiling point of 850°C, and is easily soluble in water and hydrofluoric acid. Stannous fluoride is an excellent dental anti-cavity agent, because it can effectively prevent the formation of dental plaque, inhibit bacterial metabolism, and can effectively prevent dental plaque and gingivitis; in addition, stannous fluoride, as a soluble Fluoride salt has good curative effect in treating skin bacterial and fungal infections. Therefore, stannous fluoride is often used in the preparation of fluoride toothpaste, mouthwash, and medicine for the treatment of skin allergies. [0003] The preparation method of stannous fluoride mainly comprises the following several at present: [0004] (1) Use hydrofluoric acid and elemental tin or s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G19/04
CPCC01G19/04C01P2002/72C01P2006/80
Inventor 姜涛张元波李光辉苏子键刘兵兵范晓慧彭志伟黄柱成郭宇峰杨永斌李骞陈许玲甘敏徐斌张鑫陈迎明杜明辉刘继成欧阳学臻
Owner CENT SOUTH UNIV
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