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Method for preparing H2SnO3 (tin dioxide) powder

A technology of tin dioxide and a manufacturing method, applied in the directions of tin oxide, chemical instruments and methods, tin compounds, etc., can solve the problems of unrecoverable nitrogen oxides, high environmental protection treatment costs, large consumption of nitric acid, etc. Promotion and application prospects, high tin conversion rate, and the effect of shortened reaction time

Active Publication Date: 2005-08-24
云南锡业研究院有限公司研究设计院
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] It can be seen from the above reactions that in the traditional production process, on the one hand, a large amount of nitrogen oxides produced by the reaction cannot be effectively recycled, and the amount of nitric acid is large; Big

Method used

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  • Method for preparing H2SnO3 (tin dioxide) powder
  • Method for preparing H2SnO3 (tin dioxide) powder
  • Method for preparing H2SnO3 (tin dioxide) powder

Examples

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Embodiment 1

[0027] Add 28 liters of water, 2.5Kg tin flower, and 4.78 liters of 39.9% industrial nitric acid in a 50 liter pressurized reactor, heat and control it at 125±5°C, and react at a pressure of 0.9MPa for 6 hours. After the reaction was finished, the liquid and solid were separated to obtain 28 liters of the reaction raffinate and the intermediate product metastannic acid. The composition of the reaction raffinate is HNO 3 56.74g / L, Sn0.000048g / L, Fe0.00048g / L, Pb0.016g / L. Reaction raffinate replenishes 1.72 liters of industrial nitric acid and returns to the pressurized reactor, and the mass ratio of the acid tin to be controlled is 0.952 (same as the reaction conditions), and 2.5Kg of tin flower is added in addition, and reacts under the above-mentioned reaction conditions, and the residual acid after the reaction is re- Supplementary acid returns to the reaction, and so on. The intermediate product metastannic acid that reaction produces is processed by existing production m...

Embodiment 2

[0029] at 2m 3 Add water 1.2m into the pressurized reactor 3 , tin powder 110Kg, industrial nitric acid (including HNO 3 39.9%) 270 liters, heated to 140°C, and reacted for 5 hours under the pressure of 0.7MPa. After the reaction, the liquid and solid were separated to obtain a reaction residue of 1.15m 3 And the intermediate product metastannic acid, the reaction raffinate composition is HNO 3 62.17g / L, Sn0.000585g / L, Fe0.0016g / L, Pb0.009g / L. Add 130 liters of industrial nitric acid to the residual liquid and return to the pressurized reactor, control the mass ratio of acid tin to 1.34 (same as the above reaction), add 110Kg of tin powder, react under the above reaction conditions, and return the residual acid after the reaction to supplement the acid , and back and forth. The intermediate product metastannic acid produced by the reaction is processed according to the existing production method. After neutralization and washing, 123Kg of tin dioxide is obtained after dry...

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Abstract

A process for preparing H2SnO3 and SnO2 powder includes such steps as reaction between Sn and nitric acid in sealed pressure reactor containing O2 to obtain the intermediate of H2SnO3, neutralizing, washing, drying to obtain H2SnO3, calcining, and breaking to obtani superfine SnO2 powder.

Description

technical field [0001] The present invention relates to a kind of manufacture method of tin-based compound powder, be specifically related to metastannic acid (molecular formula: H 2 SnO 3 ) and tin dioxide (molecular formula: SnO 2 ) powder manufacturing method. Background technique [0002] Metastannic acid and acid-processed tin dioxide belong to the same category of tin inorganic chemical products and have a wide range of industrial uses. Mainly used in ceramics, construction, enamel, glass, electronics, decoration and other industries, as glazes, pigments, flame retardants, catalysts, etc. The traditional wet production method is to use metal tin and concentrated nitric acid to directly react to produce metastannic acid (tin dioxide) products. Concentrated nitric acid is added to the container for a violent reaction. After the reaction, metastannic acid is produced by neutralization, washing, filtration, and drying. The metastannic acid is calcined and crushed to ob...

Claims

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Application Information

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IPC IPC(8): C01G19/00C01G19/02
Inventor 付文祥董保生王炜杨成林陈学元
Owner 云南锡业研究院有限公司研究设计院
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