二水硫酸钙与碳酸铵反应过程中物料比对钙离子相转移速率的影响

摘要

选择二水硫酸钙晶须为研究对象，在温度、搅拌速度、料浆浓度不变的条件下，探究了二水硫酸钙与碳酸铵反应过程中物料比 n(NH 4)2 CO 3：nCaSO 4∙2 H 2 O 对钙离子相转移速率的影响。结果表明，物料比在1.05∶1~1.4∶1之间时，生成的碳酸钙沉淀于溶液中，钙离子相转移是溶解-结晶过程，二水硫酸钙转化率和碳酸钙颗粒粒径均随物料比增大而增大，即相转移速率与物料比成正比。%Calcium sulfate dihydrate whiskers were applied under constant temperature,stirring speed and slurry concentration.The material ratio of n(NH 4 )2 CO 3 ∶nCaSO 4 ∙2 H 2 O was changed to study its effect on phase transfer of calcium ions during the reaction between calcium sulfate dihydrate and ammonium car-bonate.The result showed that calcium carbonate crystals were precipitate in solution as the material ratio between 1.05∶1 and 1.4∶1,so corresponding mechanism of calcium ions phase transfer was dissolution-precipitation.It could found that both the conversion rate of calcium sulfate dihydrate and the calcium car-bonate particles size were increased with the increasing value of materials ratio.It indicated that the phase transfer rate of calcium ions was proportional to the material ratio.