The carbothermic reduction of celestite is the first step in producing many strontium products. The way materials move in the rotary kiln has an essential effect on the carbothermic reduction efficiency as well as the temperature. In this study, the reduction of celestite ore and excess carbon blend in a laboratory-scale rotary kiln was investigated. In the experiments carried out at three different temperatures, the rotational speed and slope of the furnace tube were altered, and their effects on the reaction efficiency were examined. The leachability of the reduced powders and the content of the unburned coke indicated the optimal parameters for the reaction. When the speed was increased to 10 rpm, the powders were more mobile in the stack and could react more easily with the furnace atmosphere. According to the results, celestite can be reduced by carbon at temperatures of 1000–1200 °C, at rates of between 5% and 75%. The maximum reaction yield (75%) was obtained with a slope of 2° and a rotational speed of 6 rpm at 1100 °C.

中文翻译：

---

炉斜率和转速对实验室规模回转窑中天青石碳热还原的影响

天青石的碳热还原是生产许多锶产品的第一步。物料在回转窑中的运动方式对碳热还原效率和温度有重要影响。在这项研究中，研究了实验室规模回转窑中天青石矿石和过量碳混合物的减少。在三种不同温度下进行的实验中，改变了炉管的转速和斜率，并研究了它们对反应效率的影响。还原粉末的浸出性和未燃焦的含量表明反应的最佳参数。当速度增加到 10 rpm 时，粉末在堆叠中的移动性更强，更容易与炉内气氛发生反应。根据结果​​，天青石可以在 1000–1200 °C 的温度下被碳还原，还原率在 5% 到 75% 之间。在 1100°C 下以 2° 的斜率和 6 rpm 的转速获得最大反应产率 (75%)。