以白云石为原料, 采用气液接触法制备碳酸钙晶须。研究了煅烧条件对白云石分解的影响; 同时对碳酸钙晶须的制备以及机理进行了研究, 采用XRD、 SEM等分析手段对产品进行表征。结果表明, 白云石在煅烧温度850 ℃, 升温速率10 ℃/min, 煅烧时间4 h的情况下, 分解效果最佳; 反应温度、通气速率和 搅拌速率对碳酸钙晶须的生成具有显著作用, 通过对结晶过程以及晶体的生长理论来解释碳酸钙晶须的生成。

Calcium carbonate whiskers were prepared from dolomite by gas-liquid contact method. The effect of calcination on the decomposition of dolomite was studied. At the same time, the preparation and mechanism of calcium carbonate whiskers were studied. The results showed that dolomite had the best decomposition effect at the calcination temperature of 850 ℃, the heating rate of 10 ℃/min and the calcination time of 4 h. The reaction temperature, aeration rate and stirring rate have significant effects on the formation of calcium carbonate whiskers.