中文摘要：

利用盐湖副产硫酸钙和碳酸氢铵溶液进行转化反应得到氧化钙的前驱体碳酸钙;然后,将其直接热解制备高纯氧化钙,分别考察物料配比、反应时间、反应温度等因素对硫酸钙转化率的影响,采用XRD和化学分析方法对产物进行分析,并对转化反应过程进行动力学分析。研究结果表明,在物料配比为1.3：1.0,反应时间为2.5 h,反应温度为50℃时,硫酸钙的转化率可达到99.6%,将固相产物在1 000℃热解1 h后所制备的氧化钙纯度为99.7%。转化反应过程符合收缩核模型,其的数学表达式为kt=1-（1-X）1/3,反应的表观活化能为43.4 kJ/mol,该模型表明转化反应过程受界面化学反应控制。

英文摘要：

The precursor of CaO was prepared by the conversion reaction between salt lake by-product CaSO4-2H2O and NH4HCO3 solution. And then high purity CaO was prepared by pyrolyzing. The effects of mole ratio of NHaHCO3 to CaSOa-2H2O, reaction time and temperature on the conversion rate were investigated respectively. The products were analyzed by XRD and chemical analytical method. The kinetic analysis of the conversion reaction process was made. The results show that the conversion rate of CaSO4·2H2O can reach 99.6% under the conditions of mole ratio 1.3：1.0, reaction time 2.5 h and temperature 50 ℃. The CaO with purity of 99.7% can be prepared by the pyrolysis of solid product at 1 000 ℃ for 1 h. The kinetic analysis demonstrates that the conversion process is in accordance with shrinking core model, which is expressed as a mathematical formula of kt=l-（1-X）1j3 and the apparent activation energy is 43.4 kJ/mol. The model indicates that the conversion process is controlled by the interface chemical reaction process.