| 摘要 |
PURPOSE:To produce fine powder of tin oxide having high electrical conductivity and transparency, by dissolving metallic Sn and Sb in a mixture of nitric acid and hydrochloric acid, hydrolyzing the obtained stannic acid solution, and separating, drying and calcining the obtained colloid. CONSTITUTION:Metallic Sn and 2.0-15.0wt% metallic Sb and Sb compound (based on the Sn) are dissolved in an aqueous solution of a mixture of nitric acid and hydrochloric acid to obtain a transparent solution of stannic acid. The stannic acid solution is poured into hot water and hydrolyzed to obtain the colloid of tin hydrate. The colloid is washed, separated from the liquid, dried and calcinined to improve the crystallinity. The filterability of the colloid and the dispersibility of the product can be improved by adding a polybasic carboxylic acid or its salt to the system in the hydrolysis step. Fine oxide powder can be produced by this process at a low cost with reduced consumption of nitric acid.
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