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Volume 25 Issue 12
Dec.  2018
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文章导航 >  矿物冶金与材料学报（英文）  > 2018  >  25(12): 1373-1379
Feng Chen, Wei Chen, Yu-feng Guo, Shuai Wang, Fu-qiang Zheng, Tao Jiang, Ze-qiang Xie, and Ling-zhi Yang, Thermodynamics and phase transformations in the recovery of zinc from willemite, Int. J. Miner. Metall. Mater., 25(2018), No. 12, pp. 1373-1379. https://doi.org/10.1007/s12613-018-1691-7
Cite this article as:
Feng Chen, Wei Chen, Yu-feng Guo, Shuai Wang, Fu-qiang Zheng, Tao Jiang, Ze-qiang Xie, and Ling-zhi Yang, Thermodynamics and phase transformations in the recovery of zinc from willemite, Int. J. Miner. Metall. Mater., 25(2018), No. 12, pp. 1373-1379. https://doi.org/10.1007/s12613-018-1691-7
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研究论文

Thermodynamics and phase transformations in the recovery of zinc from willemite

  • School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China

  • 通讯作者:

    Yu-feng Guo    E-mail: yfguo@csu.edu.cn

  • Willemite is a common component of zinc and lead metallurgical slags that, in the absence of effective utilization methods, cause serious environmental problems. To solve this problem and increase zinc recovery, we proposed a novel extraction method of zinc from willemite by calcified roasting followed by leaching in NH4Cl-NH3·H2O solution. The thermodynamics and phase conversion of Zn2SiO4 to zinc oxide (ZnO) during calcified roasting with CaO were investigated. The mechanism of mineralogical phase conversion and the effects of the CaO-to-Zn2SiO4 mole ratio (n(CaO)/n(Zn2SiO4)), roasting temperature, and the roasting time on zinc-bearing phase conversion were experimentally investigated. The results show that Zn2SiO4 was first converted to Ca2ZnSi2O7 and then to ZnO. The critical step in extracting zinc from willemite is the conversion of Zn2SiO4 to ZnO. The zinc percent leached in the ammonia leaching system rapidly increased because of the gradual complete phase conversion from willemite to ZnO via the calcified roasting process.
    • Research Article

    Thermodynamics and phase transformations in the recovery of zinc from willemite

    + Author Affiliations
      Abstract
    • Willemite is a common component of zinc and lead metallurgical slags that, in the absence of effective utilization methods, cause serious environmental problems. To solve this problem and increase zinc recovery, we proposed a novel extraction method of zinc from willemite by calcified roasting followed by leaching in NH4Cl-NH3·H2O solution. The thermodynamics and phase conversion of Zn2SiO4 to zinc oxide (ZnO) during calcified roasting with CaO were investigated. The mechanism of mineralogical phase conversion and the effects of the CaO-to-Zn2SiO4 mole ratio (n(CaO)/n(Zn2SiO4)), roasting temperature, and the roasting time on zinc-bearing phase conversion were experimentally investigated. The results show that Zn2SiO4 was first converted to Ca2ZnSi2O7 and then to ZnO. The critical step in extracting zinc from willemite is the conversion of Zn2SiO4 to ZnO. The zinc percent leached in the ammonia leaching system rapidly increased because of the gradual complete phase conversion from willemite to ZnO via the calcified roasting process.
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