Process Optimization of the Carbonization of Sodium Chromate for Sodium Dichromate
碳化法制备重铬酸钠工艺优化

The effects of reaction temperature,pressure of CO2,stirring speed,reaction time and concentration of feed liquid on the first carbonization rate in the process of carbonization for sodium dichromate were studied,and the influences of the first carbonation rate and total concentration of chromium on the secondary carbonation rate.The experiment was carried in a high pressure reaction kettle.The results showed that when the reaction temperature was 60℃,pressure of CO2 1.2 MPa,stirring speed 800 r/min,reaction time 2 h and liquid concentration 4.17 mol/L,the first carbonization rate reached 70%.When the first carbonation rate was 60% and total chromium concentration 5 mol/L,the secondary carbonization rate reached 95%.