| 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, adding ammonia water to the solution, separating the produced colloid, washing with water, and drying and calcining the 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 pH of the stannic acid solution is raised to >=3 by the addition of ammonia water. The produced colloid of tin hydrate is washed and subjected to the solid-liquid separation process to effect the complete removal of ammonia. The fine powder of tin oxide obtained by the treatment is dried, and calcined in air, etc., to improve the crystallinity. The yield of the hydrated tin colloid can be improved by this process, and electrically conductive fine powder of tin oxide can be produced by this process at a low cost.
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