(1. 中国科学院 过程工程研究所，北京 100080；
2. 中国科学院 研究生院，北京 100049)
摘 要: 研究铬盐清洁生产工艺中铝硅的脱除。理论计算表明：CaO加入浸出液中不会有致癌物铬酸钙的生成。结果表明：在反应温度为70~
关键字: 铬盐；清洁生产；氧化钙
production process for potassium dichromate
（1. Institute of Process Engineering, Chinese Academy of Sciences,Beijing 100080, China;
2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China）
Abstract: The separation of Al and Si in the clean production process for potassium dichromate was studied. The thermodynamic calculation results indicate that there is no produce of poisonous CaCrO4 when CaO is added into solution. When the amount of CaO addition adequately and reaction temperature between 70 ℃ and 90 ℃, the concentrations of Al and Si in solution can decrease to required value. The main product is Ca2.93Al1.97Si0.64O2.56(OH)9.44 when reaction without iron residue, while it is Ca3AlFe(SiO4)(OH)8 when reaction with iron residue. The exist of iron residue can accelerate the rate of separate reaction, and improve the separation amount of Al and Si from solution. The concentration of K2CO3 in solution has no obvious effect on the separate reaction.
Key words: potassium dichromate; cleaner production; calcium oxide
