| 摘要 |
PURPOSE:To remove an Si component and produce ZrO2 with small energy consumption in a simple process, by heating zircon sand and a carbonaceous material in a gas atmosphere containing sulfur gas and/or H2S gas at a temperature within a specific range and oxidizing and firing the resultant material. CONSTITUTION:Both zircon sand and a carbonaceous material are heated in a gas atmosphere containing sulfur gas and/or H2S gas at 1,130-1,600 deg.C temperature and sulfurized. After the sulfurization reaction, the reaction mixture is then cooled to room temperature, heated and oxidized to provide, e.g. 800 deg.C in air. There are the following advantages. The aimed ZrO2 can be continuously produced at a lower temperature with smaller energy consumption in a simple process than those in a conventional electrofusion method. SiS2 formed as a by-product is of high purity and the product ZrO2 is obtained in a readily moldable powdery state.
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