摘要
研究了水热法蔗糖还原铬酸钾/重铬酸钾为水合氧化铬的工艺过程. 考察了蔗糖用量比Rm、等温温度Tiso与等温时间tiso对Cr(VI)还原过程的影响规律,并通过L9(34)正交试验得出了三个因素的相对影响程度为tiso<Rm<Tiso,确定了还原过程的最佳工艺条件:以铬酸钾为原料,铬酸钾水溶液浓度40%,蔗糖用量比1.3即相对过量30%,等温温度240oC,等温时间40 min;以重铬酸钾为原料,重铬酸钾水溶液浓度40%,蔗糖用量比1.2,等温温度220oC;等温时间40 min. 并对铬酸钾和重铬酸钾的还原过程进行了对比分析.
Reduction of potassium chromate and potassium dichromate to chromic oxide hydrate under hydrothermal conditions using sucrose as the reducing agent was investigated. The effects of the stoichiometric mole ratio of sucrose to chromate or dichromate salts (Rm), the isothermal temperature (Tiso) and time (tiso) on the conversion of Cr6+ to Cr3+ were also studied in detail. By using the orthogonal experiment L9(34), the order of the above affecting factors was obtained: tiso<Rm<Tiso and the optimum technological conditions were suggested. When potassium chromate was used as the raw material, the suitable stoichiometric mole ratio of sucrose were 1.3, isothermal temperature 240oC, and isothermal time 40 min respectively. However, the stoichiometric mole ratio of sucrose were 1.2, isothermal temperature 220oC, and isothermal time 40 min when potassium dichromate was used as the raw material. The difference between the reduction processes of potassium chromate and potassium dichromate was comparatively analyzed.
出处
《过程工程学报》
CAS
CSCD
北大核心
2003年第1期62-67,共6页
The Chinese Journal of Process Engineering
基金
国家"863"计划资助项目(编号:2001AA647010)
关键词
水热法
蔗糖
铬酸钾
重铬酸钾
水合氧化铬
hydrothermal condition
sucrose
potassium chromate
potassium dichromate
chromic oxide hydrate
