Citation: YU Chao, QIU Ke-Qiang, CHEN Qi-Yuan. Thermodynamic Analysis of Silicothermic Reduction Zinc Oxide in Vacuum[J]. Acta Physico-Chimica Sinica, ;2011, 27(06): 1312-1318. doi: 10.3866/PKU.WHXB20110524 shu

Thermodynamic Analysis of Silicothermic Reduction Zinc Oxide in Vacuum

1.
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China

Received Date: 13 December 2010
Available Online: 11 April 2011
Fund Project: 国家重点基础研究发展计划项目(973) (2007CB613601)资助 (973) (2007CB613601)

The Gibbs free energy of a vacuum silicothermic reduction for the production of metallic zinc was calculated and analyzed thermodynamically. The results show that reducing ZnO by silicon is thermodynamically possible at 1100-1500 K. However, about 50%(w) of the ZnO was not reduced because the SiO₂ generated by the reduction of ZnO with silicon can react with ZnO and produce 2ZnO·SiO₂. Upon the addition of CaO, it can react with SiO₂ before ZnO to inhibit the production of 2ZnO·SiO₂ and ZnO can be reduced to Zn completely. Slagging reactions and the vacuum technique can be used to lower the Gibbs free energy of the reduction reaction. We carried out experiments to reduce ZnO from hot dip galvanizing ash using silicon. The results showed that the reduction efficiency of ZnO was 92.81% and the metal Zn obtained was well crystallized under the following experimental conditions: a temperature of 1448 K, a vacuum reduction time of 120 min, and a residual gas pressure of 20 Pa. X-ray diffraction (XRD)analysis indicated that the main compound in the slag was 2CaO·SiO₂.
- Vacuum silicothermic reduction,
- Hot dip galvanizing ash,
- Thermodynamics,
- Slagging reaction,
- Zinc metal
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沈阳化工大学材料科学与工程学院沈阳 110142