The Experts below are selected from a list of 174 Experts worldwide ranked by ideXlab platform

Pin Dai - One of the best experts on this subject based on the ideXlab platform.

  • utilization of Copper Tailing for autoclaved sand lime brick
    Construction and Building Materials, 2011
    Co-Authors: Yonghao Fang, Qiubo Kang, Quan Wen, Pin Dai
    Abstract:

    Abstract The influences of the batch ingredients and the autoclaving processes on the properties of autoclaved sand–lime brick from low SiO 2 content Copper Tailing were studied. The results show that the Copper Tailing with low content of SiO 2 can be used to produce autoclaved sand–lime bricks meeting GB11945-1999 for Mu 15 sand–lime brick, if only the proportion of the Copper Tailing in the brick batch does not exceed 50% (% by mass) and appropriate proportions of river sand and sand powder are added to compensate for the low SiO 2 content. XRD and SEM analyses show that the main hydrothermal reaction products in the brick are 0.9 nm, 1.1 nm and 1.4 nm tobermorite phases, and the andradite in the Copper Tailing nearly does not take part in the autoclaving reaction.

  • Utilization of Copper Tailing for autoclaved sand–lime brick
    Construction and Building Materials, 2011
    Co-Authors: Yonghao Fang, Qiubo Kang, Quan Wen, Pin Dai
    Abstract:

    Abstract The influences of the batch ingredients and the autoclaving processes on the properties of autoclaved sand–lime brick from low SiO 2 content Copper Tailing were studied. The results show that the Copper Tailing with low content of SiO 2 can be used to produce autoclaved sand–lime bricks meeting GB11945-1999 for Mu 15 sand–lime brick, if only the proportion of the Copper Tailing in the brick batch does not exceed 50% (% by mass) and appropriate proportions of river sand and sand powder are added to compensate for the low SiO 2 content. XRD and SEM analyses show that the main hydrothermal reaction products in the brick are 0.9 nm, 1.1 nm and 1.4 nm tobermorite phases, and the andradite in the Copper Tailing nearly does not take part in the autoclaving reaction.

Yonghao Fang - One of the best experts on this subject based on the ideXlab platform.

  • utilization of Copper Tailing for autoclaved sand lime brick
    Construction and Building Materials, 2011
    Co-Authors: Yonghao Fang, Qiubo Kang, Quan Wen, Pin Dai
    Abstract:

    Abstract The influences of the batch ingredients and the autoclaving processes on the properties of autoclaved sand–lime brick from low SiO 2 content Copper Tailing were studied. The results show that the Copper Tailing with low content of SiO 2 can be used to produce autoclaved sand–lime bricks meeting GB11945-1999 for Mu 15 sand–lime brick, if only the proportion of the Copper Tailing in the brick batch does not exceed 50% (% by mass) and appropriate proportions of river sand and sand powder are added to compensate for the low SiO 2 content. XRD and SEM analyses show that the main hydrothermal reaction products in the brick are 0.9 nm, 1.1 nm and 1.4 nm tobermorite phases, and the andradite in the Copper Tailing nearly does not take part in the autoclaving reaction.

  • Utilization of Copper Tailing for autoclaved sand–lime brick
    Construction and Building Materials, 2011
    Co-Authors: Yonghao Fang, Qiubo Kang, Quan Wen, Pin Dai
    Abstract:

    Abstract The influences of the batch ingredients and the autoclaving processes on the properties of autoclaved sand–lime brick from low SiO 2 content Copper Tailing were studied. The results show that the Copper Tailing with low content of SiO 2 can be used to produce autoclaved sand–lime bricks meeting GB11945-1999 for Mu 15 sand–lime brick, if only the proportion of the Copper Tailing in the brick batch does not exceed 50% (% by mass) and appropriate proportions of river sand and sand powder are added to compensate for the low SiO 2 content. XRD and SEM analyses show that the main hydrothermal reaction products in the brick are 0.9 nm, 1.1 nm and 1.4 nm tobermorite phases, and the andradite in the Copper Tailing nearly does not take part in the autoclaving reaction.

Magdalena Walczak - One of the best experts on this subject based on the ideXlab platform.

  • multifactorial study of erosion corrosion wear of a x65 steel by slurry of simulated Copper Tailing
    Tribology International, 2018
    Co-Authors: Javiera Aguirre, Magdalena Walczak
    Abstract:

    Abstract A multifactorial study of erosion–corrosion (E–C) is carried out to quantify the effects of velocity, particle concentration, temperature, pH, dissolved oxygen, and Copper ion content, with respect to the transport of Tailings slurry through an API 5L X65 pipe. The experimental design is implemented using a rotating cylinder electrode and evaluating the resulting E–C damage by weight loss. An analysis of the statistical significance reveals that the variation in the wear rate is explained by three main effects (velocity, oxygen, and temperature) and two interactions (velocity/oxygen and particle/Copper content). An empirical equation is formulated to produce contour maps of the main interactions. It is concluded that the primary damage mechanisms are the deposition of corrosion products consecutively disturbed by impinging particles and localized plastic deformation.

  • effect of dissolved Copper ions on erosion corrosion synergy of x65 steel in simulated Copper Tailing slurry
    Tribology International, 2017
    Co-Authors: Javiera Aguirre, Magdalena Walczak
    Abstract:

    Abstract Erosion-corrosion is studied in the context of carbon steel pipelines transporting Copper Tailings with focus on the influence of dissolved Copper ions present in the slurry. API 5L X65 steel is exposed to flow of slurry in rotating cylinder electrode (RCE) simulating flow conditions typical of a slurry pipe. Degradation is evaluated by means of electrochemical and gravimetric techniques, and the worn surfaces are analyzed by scanning electron microscope equipped with focused ion beam. It is found that 500 ppm of dissolved Copper ions increases the total weight loss by at least 30% and the increase is attributed to the combined contributions of corrosion and the erosion-corrosion synergy, with the underlying mechanism being galvanic coupling of steel with the reduced Copper ions deposited on steel surface.

  • Effect of dissolved Copper ions on erosion–corrosion synergy of X65 steel in simulated Copper Tailing slurry
    Tribology International, 2017
    Co-Authors: Javiera Aguirre, Magdalena Walczak
    Abstract:

    Abstract Erosion-corrosion is studied in the context of carbon steel pipelines transporting Copper Tailings with focus on the influence of dissolved Copper ions present in the slurry. API 5L X65 steel is exposed to flow of slurry in rotating cylinder electrode (RCE) simulating flow conditions typical of a slurry pipe. Degradation is evaluated by means of electrochemical and gravimetric techniques, and the worn surfaces are analyzed by scanning electron microscope equipped with focused ion beam. It is found that 500 ppm of dissolved Copper ions increases the total weight loss by at least 30% and the increase is attributed to the combined contributions of corrosion and the erosion-corrosion synergy, with the underlying mechanism being galvanic coupling of steel with the reduced Copper ions deposited on steel surface.

Ping Ning - One of the best experts on this subject based on the ideXlab platform.

  • Leaching of iron from Copper Tailings by sulfuric acid: behavior, kinetics and mechanism
    RSC Advances, 2021
    Co-Authors: Lei Tao, Xueqian Wang, Langlang Wang, Kanghuai Yang, Lu Chen, Ping Ning
    Abstract:

    Copper Tailing is a widespread and intractable solid waste in Copper production. Traditional leaching and recovery technology for Copper Tailing focuses on Copper but neglects the leaching of iron. With the increase in applications and demands of iron-containing materials for environment, understanding the leaching behaviors of iron can promote the utilization of Copper Tailings. In this study, the kinetics and mechanism of the leaching of iron from Copper Tailings using sulfuric acid were studied. Under optimal conditions (40 °C, sulfuric acid concentration of 0.53 mol L−1, stirring speed of 400 rpm, solid/liquid ratio of 1 : 10 and leaching time of 120 min), 66.45% of Fe, along with 65.32% of Zn and 59.95% of Cu, were leached from the Tailings. The leaching of iron was confirmed to be controlled by solid-film diffusion. The reaction orders for sulfuric acid concentration, solid/liquid ratio, and stirring speed were found to be 0.85, −0.70, and 0.40, respectively. Results from XRF, XRD, and SEM indicated that oxides (including CaO, CuO, and ZnO) were leached first, after which Fe2SiO4 was preferentially reacted compared to Fe3O4. The accumulation of CaSO4 and SiO2 inhibited the further leaching of iron.

  • Efficient Removal of Sulfur Dioxide from Flue Gas through Liquid Catalytic Oxidation Using Copper Tailing as the In Situ Iron Ion Donator
    Energy & Fuels, 2020
    Co-Authors: Lei Tao, Xueqian Wang, Langlang Wang, Yingjie Zhang, Ping Ning
    Abstract:

    In recent years, the utilization of Copper Tailing and removal of sulfur dioxide (SO2) have become the focus of research. In this study, Copper Tailing was used as an iron ion donator to remove SO2...

  • Removing sulfur dioxide from smelting flue and increasing resource utilization of Copper Tailing through the liquid catalytic oxidation
    Fuel Processing Technology, 2019
    Co-Authors: Lei Tao, Xueqian Wang, Ping Ning, Langlang Wang, Fan Weijun
    Abstract:

    Abstract Increasing the utilization of Copper Tailing and flue gas desulfurization is significant for Copper smelters. Copper Tailing, derived from the Copper production, was applied to flue gas desulfurization and increasing utilization of Copper Tailing and smelting gas with low concentrations of SO2 by preparing slurries composed of Copper Tailing and water. The effects of different factors, including the inlet SO2 concentration, the ratio of solid to liquid, the absorption temperature, the O2 concentration, the gas flow rate, the initial Copper Tailing slurry pH, and the presence of a coexisting gas were investigated systematically. The resulting products and the mechanism driving the flue gas desulfurization were also studied. The results indicated that desulfurization efficiency was primarily influenced by the inlet SO2 concentration, the ratio of solid to liquid, the absorption temperature, and the gas flow rate. An appropriate amount of NO facilitated the desulfurization. The desulfurization efficiency was maintained at or above 80% for 60 h under optimal conditions. The total weight of the Copper Tailing was reduced by approximately 8%. Ferric sulfate and magnetite could be recycled through evaporation and magnetic separation. Liquid phase catalytic oxidation by metal ions, including ferric and manganese, played a vital role in the flue gas desulfurization.

Lei Tao - One of the best experts on this subject based on the ideXlab platform.

  • Leaching of iron from Copper Tailings by sulfuric acid: behavior, kinetics and mechanism
    RSC Advances, 2021
    Co-Authors: Lei Tao, Xueqian Wang, Langlang Wang, Kanghuai Yang, Lu Chen, Ping Ning
    Abstract:

    Copper Tailing is a widespread and intractable solid waste in Copper production. Traditional leaching and recovery technology for Copper Tailing focuses on Copper but neglects the leaching of iron. With the increase in applications and demands of iron-containing materials for environment, understanding the leaching behaviors of iron can promote the utilization of Copper Tailings. In this study, the kinetics and mechanism of the leaching of iron from Copper Tailings using sulfuric acid were studied. Under optimal conditions (40 °C, sulfuric acid concentration of 0.53 mol L−1, stirring speed of 400 rpm, solid/liquid ratio of 1 : 10 and leaching time of 120 min), 66.45% of Fe, along with 65.32% of Zn and 59.95% of Cu, were leached from the Tailings. The leaching of iron was confirmed to be controlled by solid-film diffusion. The reaction orders for sulfuric acid concentration, solid/liquid ratio, and stirring speed were found to be 0.85, −0.70, and 0.40, respectively. Results from XRF, XRD, and SEM indicated that oxides (including CaO, CuO, and ZnO) were leached first, after which Fe2SiO4 was preferentially reacted compared to Fe3O4. The accumulation of CaSO4 and SiO2 inhibited the further leaching of iron.

  • Efficient Removal of Sulfur Dioxide from Flue Gas through Liquid Catalytic Oxidation Using Copper Tailing as the In Situ Iron Ion Donator
    Energy & Fuels, 2020
    Co-Authors: Lei Tao, Xueqian Wang, Langlang Wang, Yingjie Zhang, Ping Ning
    Abstract:

    In recent years, the utilization of Copper Tailing and removal of sulfur dioxide (SO2) have become the focus of research. In this study, Copper Tailing was used as an iron ion donator to remove SO2...

  • Removing sulfur dioxide from smelting flue and increasing resource utilization of Copper Tailing through the liquid catalytic oxidation
    Fuel Processing Technology, 2019
    Co-Authors: Lei Tao, Xueqian Wang, Ping Ning, Langlang Wang, Fan Weijun
    Abstract:

    Abstract Increasing the utilization of Copper Tailing and flue gas desulfurization is significant for Copper smelters. Copper Tailing, derived from the Copper production, was applied to flue gas desulfurization and increasing utilization of Copper Tailing and smelting gas with low concentrations of SO2 by preparing slurries composed of Copper Tailing and water. The effects of different factors, including the inlet SO2 concentration, the ratio of solid to liquid, the absorption temperature, the O2 concentration, the gas flow rate, the initial Copper Tailing slurry pH, and the presence of a coexisting gas were investigated systematically. The resulting products and the mechanism driving the flue gas desulfurization were also studied. The results indicated that desulfurization efficiency was primarily influenced by the inlet SO2 concentration, the ratio of solid to liquid, the absorption temperature, and the gas flow rate. An appropriate amount of NO facilitated the desulfurization. The desulfurization efficiency was maintained at or above 80% for 60 h under optimal conditions. The total weight of the Copper Tailing was reduced by approximately 8%. Ferric sulfate and magnetite could be recycled through evaporation and magnetic separation. Liquid phase catalytic oxidation by metal ions, including ferric and manganese, played a vital role in the flue gas desulfurization.