(1. 中國科學(xué)院 過程工程研究所，北京 100080；
2. 中國科學(xué)院 研究生院，北京 100049)
摘 要: 研究鉻鹽清潔生產(chǎn)工藝中鋁硅的脫除。理論計算表明：CaO加入浸出液中不會有致癌物鉻酸鈣的生成。結(jié)果表明：在反應(yīng)溫度為70~
關(guān)鍵字: 鉻鹽；清潔生產(chǎn)；氧化鈣
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
