Volume 8 Issue 4
Jul.  2018
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Article Navigation >  Journal of Environmental Engineering Technology  > 2018  >  8(4): 398-405
HU Ming, HU Xun, YANG Lingzhi, SHAO Zheru, CHENG Yi, XU Pengcheng. The equilibrium phase relations and liquidus characteristics of multi-component oxide systems of hazardous waste incineration ash and slag[J]. Journal of Environmental Engineering Technology, 2018, 8(4): 398-405. doi: 10.3969/j.issn.1674-991X.2018.04.052
Citation: HU Ming, HU Xun, YANG Lingzhi, SHAO Zheru, CHENG Yi, XU Pengcheng. The equilibrium phase relations and liquidus characteristics of multi-component oxide systems of hazardous waste incineration ash and slag[J]. Journal of Environmental Engineering Technology, 2018, 8(4): 398-405. doi: 10.3969/j.issn.1674-991X.2018.04.052
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The equilibrium phase relations and liquidus characteristics of multi-component oxide systems of hazardous waste incineration ash and slag

doi: 10.3969/j.issn.1674-991X.2018.04.052

  • 1. China Everbright Group Post-Doctoral Scientific Research Workstation, Beijing 100033, China

  • 2. Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

  • 3. Everbright Envirotech(China) Co.,Ltd., Nanjing 211102, China

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

  • Received Date: 2018-03-13
  • Publish Date: 2018-07-20
    Abstract
  • Vitrification is considered as a promising technology for Hazardous Waste Incineration Ash and Slag(HWIAS), which can realize the reduction, innocent treatment and resource utilization of HWIAS. The main oxide components of HWIAS are CaO, Al2O3, SiO2, Na2O, FeOx and MgO, and the thermodynamic properties and equilibrium phase relations of the CaO-SiO2-Al2O3-Na2O-FeOx-MgO system are essential data for the slag formation in thermal processing of HWIAS. According to the main components of HWIAS, the equilibrium phase relations and liquid phase characteristics of the multicomponent systems were calculated for different temperature and oxygen partial pressures by using the thermodynamic software FactSage. The multicomponent systems include CaO-SiO2-Al2O3-Na2O, CaO-SiO2-Al2O3-FeOx, CaO-SiO2-Al2O3-Na2O-FeOx and CaO-SiO2-Al2O3-Na2O-FeOx-MgO systems. The results showed that the effects of temperature and oxygen partial pressure on the equilibrium phase relations and liquidus characteristics of the four multicomponent systems mentioned above were remarkable. The liquid zone enlarged with increasing temperature from 1 400 to 1 500 ℃. For the multicomponent systems containing FeOx, the liquid zone increased with the reduction of oxygen partial pressure. In addition, the equilibrium phase relations and liquidus characteristics of different multicomponent systems differ greatly at the same temperature and oxygen partial pressure, so the reasonable technological conditions should be chosen according to the thermodynamic properties of the actual oxide system in HWIAS.

     

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