中國有色金屬學報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 22 No. 3 March 2012 |
（1. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
2. College of Biology and Environment Sciences, Jishou University, Jishou 416000, China）
Abstract:Zn reduction was investigated by the vacuum carbothermic reduction of hemimorphite with or without CaF2 as catalyst. Results indicate that CaF2 can catalyze the carbothermic reduction of zinc silicate, decrease the reaction temperature and time. The lower the reaction temperature and the more the amount of CaF2, the better the catalytic effect. The optimal process condition is obtained as follows: the addition of about 10% CaF2, the reaction temperature of 1373 K, the molar ratio of C to ZnTotal of 2.5, the pressure of system lower than 20 kPa, the reaction time of about 40 min. Under the optimal process condition, the zinc reduction rate is about 93% from hemimorphite.
Key words: metal zinc; calcium fluoride; catalysis; carbothermic reduction; hemimorphite
