碳酸钙合成条件优化研究学士学位论文.docVIP

毕业论文 题 目: 碳酸钙合成工艺条件优化研究  摘 要 以电石渣为原料，氯化铵水溶液为钙提取剂提取电石渣中的Ca以二氧化碳为碳化剂与氯化铵反应制取高纯碳酸钙。通过改变溶液初始pH、溶液的初始浓度、合成反应温度、二氧化碳浓度及陈化时间，高纯碳酸钙。 研究结果表明，电石渣经过适当的处理后与氯化铵水溶液反应，提取出来的可以作为生产超纯碳酸钙的原料。初始PH为10.0和11.0得到的产品纯度较高；CaCl2溶液初始浓度；反应温度不宜过高，因保持在10℃左右；二氧化碳浓度为20%-40%时纯度测定效果较好；陈化时间应该在60min-90min范围内效果较好。 关键字：电石渣，氯化铵，碳酸钙，条件优化，高纯度 Optimization of conditions of calcium carbonate Abstract This study uses carbide slag as raw material, ammonium chloride solution as extractive solvent to extract Ca from carbide slag, and uses carbon dioxide as carburizer to get high purity calcium carbonate. The study finds out the optimal conditions for the synthesis of high purity calcium carbonate by changing the solution’s initial pH, the concentration of the solution, the reaction temperature, the concentration of carbon dioxide and the aging time. The results show that the carbide slag can react with ammonium chloride solution under proper treatment and conditions, the calcium extracted can be used as the raw materials of the production of ultra-pure or nanometer calcium carbonate. From the expriment ,we conclude that: the purity of the product is higher while the initial pH is 10.0 and 11.0; the initial concentration of CaCl2 solution should be higher,; the reaction temperature should not be too high or too low, just remain around 10℃;the effects of purity measurement are better while the concentration of carbon dioxide is between 20% and 40%; the aging time should be within 30min-90min in order to get better effects. Keywords: carbide slag, ammonium chloride, calcium carbonate, conditional optimization, high purity 目录 1前言 1 2 文献综述 2 2.1 电石渣应用现状 2 2.1.1 生产轻质碳酸钙 2 2.1.2 制备漂白粉 2 2.1.3 生产过氧化钙 3 2.1.4 脱硫 3 2.2 电石渣中Ca的提取 3 2.2.1 以NH4Cl为提取剂 3 2.2.2 以硝酸铵为提取剂 4 2.3 碳酸钙的生产方法及其应用 4 2.3.1 常用碳酸钙生产方法 4 2.3.2 碳酸钙的应用 5 3 实验部分 7 3.1 主要实验仪器和试剂 7 3.1.1 实验中的主要仪器 7 3.2实验流程 8 3.3 电石渣中Ca的提取和碳酸钙的合成 8 3.3.1 电石渣中Ca的提取 8 3.3.2 溶液初始pH值 8 3.3.3 溶液初始浓度 8 3.3.4 反应温度 9 3.3.5 CO2浓度 9 3.3