The Experts below are selected from a list of 1206 Experts worldwide ranked by ideXlab platform

Yu-you Yang - One of the best experts on this subject based on the ideXlab platform.

  • Effect of sulfate erosion on strength and leaching characteristic of stabilized Heavy Metal contaminated red clay
    Transactions of Nonferrous Metals Society of China, 2017
    Co-Authors: Hai-qing Zhang, Yu-you Yang
    Abstract:

    Abstract Solidification/stabilization (S/S) technology has been widely used for remediation of the Heavy Metal contaminated soils. The Heavy Metal ions will be Leached from the stabilized contaminated soil under sulfate erosion conditions, which gives rise to secondary contamination to the areas around the mine sites. The commonly used Portland cement, fly ash and quicklime were taken as binder raw materials with various mix proportions. And then, the sulphuric acid and nitric acid method was used to investigate the leaching characteristic of stabilized Heavy Metal contaminated soils. The effects of binder types and binder contents, sulfate concentrations (1.5, 3.0 and 6.0 g/L) and erosion time (0, 7, 14 and 28 d) on Leached concentrations of Heavy Metal ions from contaminated soils were studied. Moreover, a parameter named immobilization percentage (IP) was introduced to evaluate the influence of erosion time and sulfate concentration on immobilization effectiveness for Heavy Metal ions. The results showed that, the Leached Heavy Metal concentrations increased with sulfate concentration and erosion time. Comparatively speaking, the composite binders that had calcium oxide in it exhibited the worst solidification effectiveness and the lowest immobilization percentage, with the largest Leached Heavy Metal concentration.

Xian-de Xie - One of the best experts on this subject based on the ideXlab platform.

  • Hydrothermal sulfidation and floatation treatment of Heavy-Metal-containing sludge for recovery and stabilization.
    Journal of hazardous materials, 2012
    Co-Authors: Yan-jie Liang, Li-yuan Chai, Xiao-bo Min, Chong-jian Tang, Hai-jing Zhang, Xian-de Xie
    Abstract:

    This study focuses on the application of hydrothermal sulfidation and floatation to treat the Heavy-Metal-containing sludge for recovery and stabilization. After the hydrothermal sulfidation, the sulfidation percentage of zinc and lead reach up to 85.0% and 75.4%, respectively. 33.3% of Zn, 58.9% of Pb and 68.8% of Cu can be recovered from the sludge by floatation. The lower recovery of ZnS attributes to its surface and structural characteristics. To compare these characteristics, three types of synthetic Metal sulfide (ZnS, PbS and CuS) were prepared and examined with XRD, SEM and TEM. The poor floatability of the finely dispersed, round shape of ZnS can be improved by crystal modification in hydrothermal condition. With increasing the temperature and reaction time, the grain size of the ZnS increased from 7.95 nm to 44.28 nm and the recovery of Zn increased to from 33.3% to 72.8%. The TCLP results indicate that all the Leached Heavy Metal concentrations of floatation tailings are under the allowable limit. No obvious increase of Heavy Metal concentration was observed in continuous leaching procedure. The presence of alkaline compounds after hydrothermal sulfidation might act as mineralogical scavengers of dissolved Heavy Metal released by sulfide oxidation to avoid the Heavy Metal pollution.

Hai-qing Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Effect of sulfate erosion on strength and leaching characteristic of stabilized Heavy Metal contaminated red clay
    Transactions of Nonferrous Metals Society of China, 2017
    Co-Authors: Hai-qing Zhang, Yu-you Yang
    Abstract:

    Abstract Solidification/stabilization (S/S) technology has been widely used for remediation of the Heavy Metal contaminated soils. The Heavy Metal ions will be Leached from the stabilized contaminated soil under sulfate erosion conditions, which gives rise to secondary contamination to the areas around the mine sites. The commonly used Portland cement, fly ash and quicklime were taken as binder raw materials with various mix proportions. And then, the sulphuric acid and nitric acid method was used to investigate the leaching characteristic of stabilized Heavy Metal contaminated soils. The effects of binder types and binder contents, sulfate concentrations (1.5, 3.0 and 6.0 g/L) and erosion time (0, 7, 14 and 28 d) on Leached concentrations of Heavy Metal ions from contaminated soils were studied. Moreover, a parameter named immobilization percentage (IP) was introduced to evaluate the influence of erosion time and sulfate concentration on immobilization effectiveness for Heavy Metal ions. The results showed that, the Leached Heavy Metal concentrations increased with sulfate concentration and erosion time. Comparatively speaking, the composite binders that had calcium oxide in it exhibited the worst solidification effectiveness and the lowest immobilization percentage, with the largest Leached Heavy Metal concentration.

Yan-jie Liang - One of the best experts on this subject based on the ideXlab platform.

  • Hydrothermal sulfidation and floatation treatment of Heavy-Metal-containing sludge for recovery and stabilization.
    Journal of hazardous materials, 2012
    Co-Authors: Yan-jie Liang, Li-yuan Chai, Xiao-bo Min, Chong-jian Tang, Hai-jing Zhang, Xian-de Xie
    Abstract:

    This study focuses on the application of hydrothermal sulfidation and floatation to treat the Heavy-Metal-containing sludge for recovery and stabilization. After the hydrothermal sulfidation, the sulfidation percentage of zinc and lead reach up to 85.0% and 75.4%, respectively. 33.3% of Zn, 58.9% of Pb and 68.8% of Cu can be recovered from the sludge by floatation. The lower recovery of ZnS attributes to its surface and structural characteristics. To compare these characteristics, three types of synthetic Metal sulfide (ZnS, PbS and CuS) were prepared and examined with XRD, SEM and TEM. The poor floatability of the finely dispersed, round shape of ZnS can be improved by crystal modification in hydrothermal condition. With increasing the temperature and reaction time, the grain size of the ZnS increased from 7.95 nm to 44.28 nm and the recovery of Zn increased to from 33.3% to 72.8%. The TCLP results indicate that all the Leached Heavy Metal concentrations of floatation tailings are under the allowable limit. No obvious increase of Heavy Metal concentration was observed in continuous leaching procedure. The presence of alkaline compounds after hydrothermal sulfidation might act as mineralogical scavengers of dissolved Heavy Metal released by sulfide oxidation to avoid the Heavy Metal pollution.

Li-yuan Chai - One of the best experts on this subject based on the ideXlab platform.

  • Hydrothermal sulfidation and floatation treatment of Heavy-Metal-containing sludge for recovery and stabilization.
    Journal of hazardous materials, 2012
    Co-Authors: Yan-jie Liang, Li-yuan Chai, Xiao-bo Min, Chong-jian Tang, Hai-jing Zhang, Xian-de Xie
    Abstract:

    This study focuses on the application of hydrothermal sulfidation and floatation to treat the Heavy-Metal-containing sludge for recovery and stabilization. After the hydrothermal sulfidation, the sulfidation percentage of zinc and lead reach up to 85.0% and 75.4%, respectively. 33.3% of Zn, 58.9% of Pb and 68.8% of Cu can be recovered from the sludge by floatation. The lower recovery of ZnS attributes to its surface and structural characteristics. To compare these characteristics, three types of synthetic Metal sulfide (ZnS, PbS and CuS) were prepared and examined with XRD, SEM and TEM. The poor floatability of the finely dispersed, round shape of ZnS can be improved by crystal modification in hydrothermal condition. With increasing the temperature and reaction time, the grain size of the ZnS increased from 7.95 nm to 44.28 nm and the recovery of Zn increased to from 33.3% to 72.8%. The TCLP results indicate that all the Leached Heavy Metal concentrations of floatation tailings are under the allowable limit. No obvious increase of Heavy Metal concentration was observed in continuous leaching procedure. The presence of alkaline compounds after hydrothermal sulfidation might act as mineralogical scavengers of dissolved Heavy Metal released by sulfide oxidation to avoid the Heavy Metal pollution.