The Experts below are selected from a list of 14277 Experts worldwide ranked by ideXlab platform

Zhou Yue - One of the best experts on this subject based on the ideXlab platform.

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

  • utilization of Flue Gas Desulfurization gypsum as an activation agent for high volume slag concrete
    Journal of Cleaner Production, 2018
    Co-Authors: Linhua Jiang, Chenzhi Li, Chao Wang, Ning Xu
    Abstract:

    Abstract Production of cement has been resources and energy intensive, leaving massive carbon footprint. The use of slag as an admixture reduces CO2 intensity of concrete production by replacing a fraction of cement clinker with industrial solid waste. However, concrete with high volume of slag addition suffers loss in early-age strength, slow hydration and large drying shrinkage. To address this issue, Flue Gas Desulfurization gypsum was added as an activation agent for slag in the present work. The effects of Flue Gas Desulfurization gypsum addition on compressive strength, elastic modulus, resistance to carbonation, chloride ion diffusion and drying shrinkage were examined. XRD and SEM analyses were conducted to investigate the hydration products and microscopic structure. The results show that the early-age (3 d and 7 d) compressive strength of concrete increases with increasing gypsum content, reaching an optimum at 5 wt% gypsum content. Flue Gas Desulfurization gypsum addition does not affect the correlation between the elastic modulus of concrete, nor does it affect concrete resistance to chloride ion diffusion, though slight improvement in carbonation resistance is observed. Reduction in drying shrinkage is evident when the gypsum is added. XRD and SEM analyses indicate that formation of ettringite (AFt) is strongly promoted by the gypsum addition, which suggests a likely reason for the improved early-age strength and reduced drying shrinkage. With Flue Gas Desulfurization gypsum addition, as much as 55% reduction in CO2 intensity of concrete production can be achieved with no loss in concrete strength. The synergetic use of Flue Gas Desulfurization gypsum and slag makes concrete production much cleaner while turning both types of industrial solid wastes into valuable resources.

Guo Ru-xin - One of the best experts on this subject based on the ideXlab platform.

  • Domestic Application and R&D Update on Flue Gas Desulfurization Technology by Magnesium Oxide
    Sulphur Phosphorus & Bulk Materials Handling Related Engineering, 2010
    Co-Authors: Guo Ru-xin
    Abstract:

    The industrial application and RD update on the Flue Gas Desulfurization technology by magnesium oxide in China are reviewed,including the process technology features,technical economic advantages,industrial application examples,and technical equipment RD achievement for Flue Gas Desulfurization by magnesium oxide.The development prospect is examined,and it is pointeds out that the Flue Gas Desulfurization technology by magnesium oxide in China should establish the goal of having our own intellectual property right.

  • Study Progress of Flue Gas Desulfurization with Magnesium Oxide
    Sulphur Phosphorus & Bulk Materials Handling Related Engineering, 2009
    Co-Authors: Guo Ru-xin
    Abstract:

    From the industrial application of the Mg(OH)2—SO2—H2O system,the current status and latest study progress of the Flue Gas Desulfurization with magnesium oxide are outlined.Different technologies for the Flue Gas Desulfurization with magnesium oxide are reviewed,for example egeneration process,magnesium sulfate recovery process,magnesium sulfite recovery process,abandonment process,and Na2CO3 —Ca(OH)2 process.The development prospect of the Flue Gas Desulfurization with magnesium oxide based on the actual situation in China is also forecasted.

  • China’s Magnesium-based Resources and Flue Gas Desulfurization by Magnesium Oxide
    Sulphur Phosphorus & Bulk Materials Handling Related Engineering, 2009
    Co-Authors: Guo Ru-xin
    Abstract:

    The overview of China’s magnesium-based resources and status of Flue Gas Desulfurization by magnesium oxide are commented on.Magnesium-based resources include magnesite,brucite,hydromagnesite,dolomite,salt lake brine,bitter brine as byproduct from salt production using seawater,as well as the primary sludge from ammonia-soda industry,and boric sludge as byproduct from processing of boron and magnesium ore.Different magnesium agents are used in the Flue Gas Desulfurization by magnesium oxide,including synthesis method magnesium hydroxide,magnesite,brucite and light calcined magnesium oxide.Application prospect is forecast for application of different types of Flue Gas desulfurizing magnesium-based agents.

Chang Ai-lin - One of the best experts on this subject based on the ideXlab platform.

Linhua Jiang - One of the best experts on this subject based on the ideXlab platform.

  • utilization of Flue Gas Desulfurization gypsum as an activation agent for high volume slag concrete
    Journal of Cleaner Production, 2018
    Co-Authors: Linhua Jiang, Chenzhi Li, Chao Wang, Ning Xu
    Abstract:

    Abstract Production of cement has been resources and energy intensive, leaving massive carbon footprint. The use of slag as an admixture reduces CO2 intensity of concrete production by replacing a fraction of cement clinker with industrial solid waste. However, concrete with high volume of slag addition suffers loss in early-age strength, slow hydration and large drying shrinkage. To address this issue, Flue Gas Desulfurization gypsum was added as an activation agent for slag in the present work. The effects of Flue Gas Desulfurization gypsum addition on compressive strength, elastic modulus, resistance to carbonation, chloride ion diffusion and drying shrinkage were examined. XRD and SEM analyses were conducted to investigate the hydration products and microscopic structure. The results show that the early-age (3 d and 7 d) compressive strength of concrete increases with increasing gypsum content, reaching an optimum at 5 wt% gypsum content. Flue Gas Desulfurization gypsum addition does not affect the correlation between the elastic modulus of concrete, nor does it affect concrete resistance to chloride ion diffusion, though slight improvement in carbonation resistance is observed. Reduction in drying shrinkage is evident when the gypsum is added. XRD and SEM analyses indicate that formation of ettringite (AFt) is strongly promoted by the gypsum addition, which suggests a likely reason for the improved early-age strength and reduced drying shrinkage. With Flue Gas Desulfurization gypsum addition, as much as 55% reduction in CO2 intensity of concrete production can be achieved with no loss in concrete strength. The synergetic use of Flue Gas Desulfurization gypsum and slag makes concrete production much cleaner while turning both types of industrial solid wastes into valuable resources.