The Experts below are selected from a list of 348 Experts worldwide ranked by ideXlab platform

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

  • lead recovery and high silica glass Powder Synthesis from waste crt funnel glasses through carbon thermal reduction enhanced glass phase separation process
    Journal of Hazardous Materials, 2017
    Co-Authors: Mingfei Xing, Yaping Wang, Jingyu Wang, Zhiyuan Zhang
    Abstract:

    Abstract In this study, a novel process for the removal of toxic lead from the CRT funnel glass and synchronous preparation of high silica glass Powder was developed by a carbon-thermal reduction enhanced glass phase separation process. CRT funnel glass was remelted with B2O3 in reducing atmosphere. In the thermal process, a part of PbO contained in the funnel glass was reduced into metallic Pb and detached from the glass phase. The rest of PbO and other metal oxides (including Na2O, K2O, Al2O3, BaO and CaO) were mainly concentrated in the boric oxide phase. The metallic Pb phase and boric oxide phase were completely leached out by 5 mol/L HNO3. The lead removal rate was 99.80% and high silica glass Powder (SiO2 purity >95 wt%) was obtained by setting the temperature, B2O3 added amount and holding time at 1000 °C, 20% and 30 mins, respectively. The prepared high silicate glass Powders can be used as catalyst carrier, semipermeable membranes, adsorbents or be remelted into high silicate glass as an ideal substitute for quartz glass. Thus this study proposed an eco-friendly and economical process for recycling Pb-rich electronic glass waste.

Mingfei Xing - One of the best experts on this subject based on the ideXlab platform.

  • lead recovery and high silica glass Powder Synthesis from waste crt funnel glasses through carbon thermal reduction enhanced glass phase separation process
    Journal of Hazardous Materials, 2017
    Co-Authors: Mingfei Xing, Yaping Wang, Jingyu Wang, Zhiyuan Zhang
    Abstract:

    Abstract In this study, a novel process for the removal of toxic lead from the CRT funnel glass and synchronous preparation of high silica glass Powder was developed by a carbon-thermal reduction enhanced glass phase separation process. CRT funnel glass was remelted with B2O3 in reducing atmosphere. In the thermal process, a part of PbO contained in the funnel glass was reduced into metallic Pb and detached from the glass phase. The rest of PbO and other metal oxides (including Na2O, K2O, Al2O3, BaO and CaO) were mainly concentrated in the boric oxide phase. The metallic Pb phase and boric oxide phase were completely leached out by 5 mol/L HNO3. The lead removal rate was 99.80% and high silica glass Powder (SiO2 purity >95 wt%) was obtained by setting the temperature, B2O3 added amount and holding time at 1000 °C, 20% and 30 mins, respectively. The prepared high silicate glass Powders can be used as catalyst carrier, semipermeable membranes, adsorbents or be remelted into high silicate glass as an ideal substitute for quartz glass. Thus this study proposed an eco-friendly and economical process for recycling Pb-rich electronic glass waste.

Yaping Wang - One of the best experts on this subject based on the ideXlab platform.

  • lead recovery and high silica glass Powder Synthesis from waste crt funnel glasses through carbon thermal reduction enhanced glass phase separation process
    Journal of Hazardous Materials, 2017
    Co-Authors: Mingfei Xing, Yaping Wang, Jingyu Wang, Zhiyuan Zhang
    Abstract:

    Abstract In this study, a novel process for the removal of toxic lead from the CRT funnel glass and synchronous preparation of high silica glass Powder was developed by a carbon-thermal reduction enhanced glass phase separation process. CRT funnel glass was remelted with B2O3 in reducing atmosphere. In the thermal process, a part of PbO contained in the funnel glass was reduced into metallic Pb and detached from the glass phase. The rest of PbO and other metal oxides (including Na2O, K2O, Al2O3, BaO and CaO) were mainly concentrated in the boric oxide phase. The metallic Pb phase and boric oxide phase were completely leached out by 5 mol/L HNO3. The lead removal rate was 99.80% and high silica glass Powder (SiO2 purity >95 wt%) was obtained by setting the temperature, B2O3 added amount and holding time at 1000 °C, 20% and 30 mins, respectively. The prepared high silicate glass Powders can be used as catalyst carrier, semipermeable membranes, adsorbents or be remelted into high silicate glass as an ideal substitute for quartz glass. Thus this study proposed an eco-friendly and economical process for recycling Pb-rich electronic glass waste.

Jingyu Wang - One of the best experts on this subject based on the ideXlab platform.

  • lead recovery and high silica glass Powder Synthesis from waste crt funnel glasses through carbon thermal reduction enhanced glass phase separation process
    Journal of Hazardous Materials, 2017
    Co-Authors: Mingfei Xing, Yaping Wang, Jingyu Wang, Zhiyuan Zhang
    Abstract:

    Abstract In this study, a novel process for the removal of toxic lead from the CRT funnel glass and synchronous preparation of high silica glass Powder was developed by a carbon-thermal reduction enhanced glass phase separation process. CRT funnel glass was remelted with B2O3 in reducing atmosphere. In the thermal process, a part of PbO contained in the funnel glass was reduced into metallic Pb and detached from the glass phase. The rest of PbO and other metal oxides (including Na2O, K2O, Al2O3, BaO and CaO) were mainly concentrated in the boric oxide phase. The metallic Pb phase and boric oxide phase were completely leached out by 5 mol/L HNO3. The lead removal rate was 99.80% and high silica glass Powder (SiO2 purity >95 wt%) was obtained by setting the temperature, B2O3 added amount and holding time at 1000 °C, 20% and 30 mins, respectively. The prepared high silicate glass Powders can be used as catalyst carrier, semipermeable membranes, adsorbents or be remelted into high silicate glass as an ideal substitute for quartz glass. Thus this study proposed an eco-friendly and economical process for recycling Pb-rich electronic glass waste.

Reppert Thorsten - One of the best experts on this subject based on the ideXlab platform.

  • Herstellung und Charakterisierung von Lithiumlanthanzirkonat-Funktionsschichten für Lithium-Festkörperbatterien
    Forschungszentrum Jülich GmbH Zentralbibliothek Verlag, 2018
    Co-Authors: Reppert Thorsten
    Abstract:

    The aim of this work is to produce a lithium ion conducting solid electrolyte as basicmaterial for application in new efficient energy storage such as solid state batteries. If theliquid electrolyte in lithium ion batteries (LIB) is replaced by a self-supported solidelectrolyte, safety, durability and energy density can be improved. Tape casting is a suitablemethod to process aforementioned self-supported solid electrolytes.The focus is on the Powder Synthesis of lithium lanthanum zirconate (Li7La3Zr2O12; LLZO)which can be optimized by substitution with elements like Al, Ta or Y. These substitutedLLZO compositions show improved mechanical and (electro-) chemical stability, and havethe highest lithium ion conductivity for all oxide electrolytes. Furthermore, a comparisonbetween the Synthesis by solid state reaction and by spray pyrolysis is made. In respect ofthe influence of process parameters, the microstructure, mechanical properties and the ionicconductivity of sintered pellets are examined. Spray pyrolysis has proved to be a scalablemethod which was used to synthesize Al-LLZO in a purely cubic phase. Moreover, in thiswork it is shown that Ta-LLZO has the most suitable cross-section profile in matters ofsinterbility, the mechanical properties (hardness and elastic modulus) and lithium ionconductivity.Another main focus is the characterization of LLZO’s crystal structure. Several LLZOelectrolytes have been sintered in an air or an argon atmosphere and were subsequentlyexamined by complementary characterization methods in the context of a cooperation withthe Oak Ridge National Laboratory (ORNL). Next to the crystal structure, especially theatomic positions as well as the occupancies of lithium were determined for several LLZOcompositions. A water-free Synthesis of LLZO Powders was proven by inelastic neutronscattering and in addition, a lithium-proton exchange was prevented. Furthermore, neutronbackscattering is used to determine LLZO’s self-diffusion constants and related activationenergies. Thus, it could be shown that the tetragonal LLZO phase doesn’t contributesignificantly to lithium ion’s self-diffusion.Spray pyrolyzed Al-LLZO was used for a tape casting slurry’s development. A defect-freethin electrolyte film was cast and used for sintering experiments. The microstructure ofsintered solid state electrolytes still is not sufficient for a self-supported solid electrolyte.Though, a promising candidate for continuing tape casting is tantalum substituted LLZOsynthesized by spray pyrolysis. Its suitable particle size distribution and sinterbility enablethe fabrication of self-supported LLZO functional layer for solid state lithium ion batterie

  • Herstellung und Charakterisierung von Lithiumlanthanzirkonat-Funktionsschichten für Lithium-Festkörperbatterien
    Forschungszentrum Jülich GmbH Zentralbibliothek Verlag, 2018
    Co-Authors: Reppert Thorsten
    Abstract:

    The aim of this work is to produce a lithium ion conducting solid electrolyte as basic material for application in new efficient energy storage such as solid state batteries. If the liquid electrolyte in lithium ion batteries (LIB) is replaced by a self-supported solid electrolyte, safety, durability and energy density can be improved. Tape casting is a suitable method to process aforementioned self-supported solid electrolytes. The focus is on the Powder Synthesis of lithium lanthanum zirconate (Li$_{7}$La$_{3}$Zr$_{2}$O$_{12}$;LLZO)which can be optimized by substitution with elements like Al, Ta or Y. These substituted LLZO compositions show improved mechanical and (electro-) chemical stability, and have the highest lithium ion conductivity for all oxide electrolytes. Furthermore, a comparison between the Synthesis by solid state reaction and by spray pyrolysis is made. In respect of the influence of process parameters, the microstructure, mechanical properties and the ionic conductivity of sintered pellets are examined. Spray pyrolysis has proved to be a scalable method which was used to synthesize Al-LLZO in a purely cubic phase. Moreover, in this work it is shown that Ta-LLZO has the most suitable cross-section profile in matters of sinterbility, the mechanical properties (hardness and elastic modulus) and lithium ion conductivity. Another main focus is the characterization of LLZO’s crystal structure. Several LLZO electrolytes have been sintered in an air or an argon atmosphere and were subsequently examined by complementary characterization methods in the context of a cooperation with the $\textit{Oak Ridge National Laboratory}$ (ORNL). Next to the crystal structure, especially the atomic positions as well as the occupancies of lithium were determined for several LLZO compositions. A water-free Synthesis of LLZO Powders was proven by inelastic neutron scattering and in addition, a lithium-proton exchange was prevented. Furthermore, neutron backscattering is used to determine LLZO’s self-diffusion constants and related activation energies. Thus, it could be shown that the tetragonal LLZO phase doesn’t contribute significantly to lithium ion’s self-diffusion. Spray pyrolyzed Al-LLZO was used for a tape casting slurry’s development. A defect-free thin electrolyte film was cast and used for sintering experiments. The microstructure of sintered solid state electrolytes still is not sufficient for a self-supported solid electrolyte. Though, a promising candidate for continuing tape casting is tantalum substituted LLZOsynthesized by spray pyrolysis. Its suitable particle size distribution and sinterbility enable the fabrication of self-supported LLZO functional layer for solid state lithium ion batteries