碳化法制备重铬酸钠工艺优化  

Process Optimization of the Carbonization of Sodium Chromate for Sodium Dichromate

作　　者：曲景奎[1] 周恩年[1,2] 郭为 余志辉[1] 齐涛[1] 

机构地区：[1]中国科学院过程工程研究所绿色过程与工程院重点实验室,湿法冶金清洁生产技术国家工程实验室,北京100190 [2]中国科学院研究生院,北京100049 [3]北京天健兴业资产评估有限公司,北京100045

出　　处：《过程工程学报》2012年第4期636-640,共5页The Chinese Journal of Process Engineering

基　　金：国家杰出青年基金资助项目(编号:51125018);国家重点基础研究发展计划(973)基金资助项目(编号:2009AA035001);国家自然科学基金资助项目(编号:21006119);国家高技术研究发展计划(863)基金资助项目(编号:2011AA060704)

摘　　要：在2L高压反应釜内,通过测定平衡时总Cr^(6+)浓度及Cr2O7^(2-)浓度,研究了反应温度、CO_2压力、搅拌转速、碳化反应时间及Na2CrO4料液浓度对碳化法生产Na2Cr2O7工艺中一次碳化率的影响及一次碳化率、总Cr6+浓度对Na2CrO4二次碳化率的影响.结果表明,在反应温度60℃、CO_2压强1.2MPa、搅拌速度800r/min、反应时间2h及料液浓度4.17mol/L时,一次碳化率可达70%;一次碳化率为60%及总Cr6+浓度为5mol/L时,二次碳化率可达95%.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%.

关 键 词：铬酸钠 碳化率 工艺条件优化 重铬酸钠 

分 类 号：O6-332[理学—化学]