The Experts below are selected from a list of 1437 Experts worldwide ranked by ideXlab platform

Kai Wu - One of the best experts on this subject based on the ideXlab platform.

  • utilization of municipal solid waste incineration fly ash for sulfoaluminate cement Clinker Production
    Waste Management, 2011
    Co-Authors: Kai Wu
    Abstract:

    Highlights: > The replacement can be taken up to 30% of MSWI fly ash in the raw mix. > The novelty compositional parameters were defined, their optimum values were determined. > Expansive property of SAC is strongly depended on gypsum content. > Three leaching test methods are used to assess the environmental impact. - Abstract: The feasibility of partially substituting raw materials with municipal solid waste incineration (MSWI) fly ash in sulfoaluminate cement (SAC) Clinker Production was investigated by X-ray diffraction (XRD), compressive strength and free expansion ratio testing. Three different leaching tests were used to assess the environmental impact of the produced material. Experimental results show that the replacement of MSWI fly ash could be taken up to 30% in the raw mixes. The good quality SAC Clinkers are obtained by controlling the compositional parameters at alkalinity modulus (C{sub m}) around 1.05, alumina-sulfur ratio (P) around 2.5, alumina-silica ratio (N) around 2.0{approx}3.0 and firing the raw mixes at 1250 deg. C for 2 h. The compressive strengths of SAC are high in early age while that develop slowly in later age. Results also show that the expansive properties of SAC are strongly depended on the gypsum content. Leaching studiesmore » of toxic elements in the hydrated SAC-based system reveal that all the investigated elements are well bounded in the Clinker minerals or immobilized by the hydration products. Although some limited positive results indicate that the SAC prepared from MSWI fly ash would present no immediate thread to the environment, the long-term toxicity leaching behavior needs to be further studied.« less

  • Utilization of municipal solid waste incineration fly ash for sulfoaluminate cement Clinker Production.
    Waste management (New York N.Y.), 2011
    Co-Authors: Kai Wu
    Abstract:

    The feasibility of partially substituting raw materials with municipal solid waste incineration (MSWI) fly ash in sulfoaluminate cement (SAC) Clinker Production was investigated by X-ray diffraction (XRD), compressive strength and free expansion ratio testing. Three different leaching tests were used to assess the environmental impact of the produced material. Experimental results show that the replacement of MSWI fly ash could be taken up to 30% in the raw mixes. The good quality SAC Clinkers are obtained by controlling the compositional parameters at alkalinity modulus (C(m)) around 1.05, alumina-sulfur ratio (P) around 2.5, alumina-silica ratio (N) around 2.0~3.0 and firing the raw mixes at 1250 °C for 2h. The compressive strengths of SAC are high in early age while that develop slowly in later age. Results also show that the expansive properties of SAC are strongly depended on the gypsum content. Leaching studies of toxic elements in the hydrated SAC-based system reveal that all the investigated elements are well bounded in the Clinker minerals or immobilized by the hydration products. Although some limited positive results indicate that the SAC prepared from MSWI fly ash would present no immediate thread to the environment, the long-term toxicity leaching behavior needs to be further studied.

  • Utilization of municipal solid waste incineration fly ash for sulfoaluminate cement Clinker Production
    Waste Management, 2011
    Co-Authors: Kai Wu, Huisheng Shi, Xiaolu Guo
    Abstract:

    The feasibility of partially substituting raw materials with municipal solid waste incineration (MSWI) fly ash in sulfoaluminate cement (SAC) Clinker Production was investigated by X-ray diffraction (XRD), compressive strength and free expansion ratio testing. Three different leaching tests were used to assess the environmental impact of the produced material. Experimental results show that the replacement of MSWI fly ash could be taken up to 30% in the raw mixes. The good quality SAC Clinkers are obtained by controlling the compositional parameters at alkalinity modulus (C m) around 1.05, alumina-sulfur ratio (P) around 2.5, alumina-silica ratio (N) around 2.0∼3.0 and firing the raw mixes at 1250 °C for 2. h. The compressive strengths of SAC are high in early age while that develop slowly in later age. Results also show that the expansive properties of SAC are strongly depended on the gypsum content. Leaching studies of toxic elements in the hydrated SAC-based system reveal that all the investigated elements are well bounded in the Clinker minerals or immobilized by the hydration products. Although some limited positive results indicate that the SAC prepared from MSWI fly ash would present no immediate thread to the environment, the long-term toxicity leaching behavior needs to be further studied. © 2011 Elsevier Ltd.

Alejandro Josa - One of the best experts on this subject based on the ideXlab platform.

  • Comparative LCA of sewage sludge valorisation as both fuel and raw material substitute in Clinker Production
    Journal of Cleaner Production, 2013
    Co-Authors: Cesar Valderrama, Manel Guillem, Ricard Granados, Carles M. Gasol, José Luis Cortina, Alejandro Josa
    Abstract:

    A life cycle assessment to evaluate the environmental impact of urban sewage sludge use as alternative fuel or raw material in Clinker Production was carried out. In order to quantify in detail the overall environmental impact of both scenarios, the sewage sludge treatment process and the transport to cement facilities for both alternatives were considered. The substitution ratio of fuel (petcoke) and raw material (limestone) was fixed between 5 and 15% according to the cement Production plant limitations. Both scenarios show CO2 savings when compared to the Clinker Production without substitution. The mid-point and end-point analysis were favourable to the fuel substitution with savings ranging from 3 to 7% compared to the raw material substitution and also to base case without substitution. The influence of the amount of sewage sludge used for both scenarios indicates that fuel substitution reduced the CO2 emissions when the amount of substitution is increased, while other mid-point and end-point categories were proportionally favourable to the fuel substitution scenario. Additionally, the influence of the substituted material characteristics showed that low heating value (fuel substitution) and CaO addition in lime stabilized sludge (raw material substitution) are critical parameters in terms of environmental impact in Clinker Production. The fuel substitution represents a significant environmental improvement compared to the raw material substitution scenario and Clinker Production without substitution.

  • Comparative LCA of sewage sludge valorisation as both fuel and raw material substitute in Clinker Production
    Journal of Cleaner Production, 2013
    Co-Authors: Cesar Valderrama, Manel Guillem, Ricard Granados, Carles M. Gasol, José Luis Cortina, Alejandro Josa
    Abstract:

    A life cycle assessment to evaluate the environmental impact of urban sewage sludge use as alternative fuel or raw material in Clinker Production was carried out. In order to quantify in detail the overall environmental impact of both scenarios, the sewage sludge treatment process and the transport to cement facilities for both alternatives were considered. The substitution ratio of fuel (petcoke) and raw material (limestone) was fixed between 5 and 15% according to the cement Production plant limitations. Both scenarios show CO2 savings when compared to the Clinker Production without substitution. The mid-point and end-point analysis were favourable to the fuel substitution with savings ranging from 3 to 7% compared to the raw material substitution and also to base case without substitution. The influence of the amount of sewage sludge used for both scenarios indicates that fuel substitution reduced the CO2 emissions when the amount of substitution is increased, while other mid-point and end-point categories were proportionally favourable to the fuel substitution scenario. Additionally, the influence of the substituted material characteristics showed that low heating value (fuel substitution) and CaO addition in lime stabilized sludge (raw material substitution) are critical parameters in terms of environmental impact in Clinker Production. The fuel substitution represents a significant environmental improvement compared to the raw material substitution scenario and Clinker Production without substitution. © 2013 Elsevier Ltd. All rights reserved.

Nele De Belie - One of the best experts on this subject based on the ideXlab platform.

  • Fibrecement recycling as raw material for Portland Clinker Production
    2020
    Co-Authors: Joris Schoon, Isabel Van Driessche, L Van Der Heyden, Nele De Belie
    Abstract:

    This paper aims to examine the use of fibre cement waste as an alternative raw material for Clinker kilns with enumeration of the possible limitations. The ultimate aim is to find a nobler use for fibrecement waste and to develop a more sustainable Production of Portland Clinker by saving natural resources and with a potential effect of reduction of CO2 emissions. Numerical simulations are carried out to maximize the use of fibrecement waste in Clinker kilns, taking into account the chemical variation of the waste, its behaviour within a Clinker kiln, the impact on energy consumption and finally the influence on the carbon footprint calculated from the decarbonation and the fuels used. Furthermore, experimental Clinkers are produced and analysed according to the above described concept and corresponding with waste dosages that are esteemed as realistic. The use of fibre cement waste as an alternative raw material was found to be possible, without compromising the physical, chemical or mineralogical properties of the Clinker.

  • MgO as fluxing agent for a sustainable Portland Clinker Production
    2020
    Co-Authors: Joris Schoon, Klaartje De Buysser, Isabel Van Driessche, Nele De Belie
    Abstract:

    MgO in Clinker and cement is generally related to the soundness of concrete by the presence of periclase. MgO is also described in literature as a possible fluxing agent in combination with R2O (R = Li, Na, K) and SO3 which could increase alite (C3S) formation and lower the temperature of the liquid formation in Portland Clinker Production. This fluxing effect could improve the burability of the Cold Clinker Meal (CCM) and could lower the energy consumption of a Clinker kiln. By using fines and sludge generated out of the Production of porphyry and dolomitic limestone aggregates as Alternative Raw Material (ARM), an effort was made to create this effect in a practical way. Simulations were carried out, CCMs were composed and experimental Clinkers were sintered with dosages of fines and sludge that were maximised but esteemed as realistic. The final Clinkers were fully analysed and evaluated on possible mineralogical influences.

  • feasibility study on the use of cellular concrete as alternative raw material for portland Clinker Production
    Construction and Building Materials, 2013
    Co-Authors: Joris Schoon, Klaartje De Buysser, Isabel Van Driessche, Nele De Belie
    Abstract:

    Abstract This paper aims to investigate the use of cellular concrete as an alternative raw material (ARM) for Portland Clinker kilns. The possibility to generate a raw material with a stable compositional variation was investigated as well as simulations were carried out to maximise their use in Clinker kilns. Based on these simulations, experimental Clinkers were produced with dosages that were esteemed as realistic. Because of the presence of important levels of quartz sand in the cellular concrete materials, the energy necessary to grind the alternative raw material in comparison with comparable classic raw materials was investigated as well as the influence of the final particle size distribution of the Cold Clinker Meal (CCM) on the mineralogical composition of the final Clinkers. It will be demonstrated that cellular concrete materials can be used as ARM for Clinker Production although there are some important restrictions that will limit the practical implementation. This investigation will also provide some interesting knowledge on the use of other recycled concrete materials as alternative raw material for Portland Clinker Production.

  • the regeneration of cement out of completely recyclable concrete Clinker Production evaluation
    Construction and Building Materials, 2013
    Co-Authors: Mieke De Schepper, Klaartje De Buysser, Isabel Van Driessche, Nele De Belie
    Abstract:

    Abstract The concrete industry is known for its big impact on the environment, therefore the concept of Completely Recyclable Concrete (CRC) has been developed. After the demolition of a CRC construction, the concrete rubble is recycled as raw material for cement Production, without need for ingredient adjustments. In this paper the design method and regeneration process are presented. It was proven by microscopic and XRD analysis that the recycled Clinker contains the traditional Clinker minerals. Isothermal calorimetry showed that after 7 days the regenerated Clinkers reach a hydration heat which varies between 73% and 94% of the heat produced by a commercial OPC.

  • waste fibrecement an interesting alternative raw material for a sustainable portland Clinker Production
    Construction and Building Materials, 2012
    Co-Authors: Joris Schoon, Klaartje De Buysser, Isabel Van Driessche, L Van Der Heyden, Pierre Eloy, Eric M Gaigneux, Nele De Belie
    Abstract:

    This paper aims to examine the use of fibrecement waste as an alternative raw material for Portland Clinker kilns with enumeration of possible limitations. Numerical simulations were carried out to maximise the use of fibrecement waste in Clinker kilns taking into account the compositional variation of the waste, its behaviour within a Clinker kiln, the impact on the energy consumption and finally the influence on the carbon footprint calculated from the decarbonation. Furthermore, experimental Clinkers were produced corresponding with waste dosages that were esteemed as realistic by the numerical simulations. These Clinkers were fully analysed and evaluated according to the above described evaluation concept. © 2012 Elsevier Ltd.

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

  • Utilization of municipal solid waste incineration fly ash for sulfoaluminate cement Clinker Production
    Waste Management, 2011
    Co-Authors: Kai Wu, Huisheng Shi, Xiaolu Guo
    Abstract:

    The feasibility of partially substituting raw materials with municipal solid waste incineration (MSWI) fly ash in sulfoaluminate cement (SAC) Clinker Production was investigated by X-ray diffraction (XRD), compressive strength and free expansion ratio testing. Three different leaching tests were used to assess the environmental impact of the produced material. Experimental results show that the replacement of MSWI fly ash could be taken up to 30% in the raw mixes. The good quality SAC Clinkers are obtained by controlling the compositional parameters at alkalinity modulus (C m) around 1.05, alumina-sulfur ratio (P) around 2.5, alumina-silica ratio (N) around 2.0∼3.0 and firing the raw mixes at 1250 °C for 2. h. The compressive strengths of SAC are high in early age while that develop slowly in later age. Results also show that the expansive properties of SAC are strongly depended on the gypsum content. Leaching studies of toxic elements in the hydrated SAC-based system reveal that all the investigated elements are well bounded in the Clinker minerals or immobilized by the hydration products. Although some limited positive results indicate that the SAC prepared from MSWI fly ash would present no immediate thread to the environment, the long-term toxicity leaching behavior needs to be further studied. © 2011 Elsevier Ltd.

Cesar Valderrama - One of the best experts on this subject based on the ideXlab platform.

  • Comparative LCA of sewage sludge valorisation as both fuel and raw material substitute in Clinker Production
    Journal of Cleaner Production, 2013
    Co-Authors: Cesar Valderrama, Manel Guillem, Ricard Granados, Carles M. Gasol, José Luis Cortina, Alejandro Josa
    Abstract:

    A life cycle assessment to evaluate the environmental impact of urban sewage sludge use as alternative fuel or raw material in Clinker Production was carried out. In order to quantify in detail the overall environmental impact of both scenarios, the sewage sludge treatment process and the transport to cement facilities for both alternatives were considered. The substitution ratio of fuel (petcoke) and raw material (limestone) was fixed between 5 and 15% according to the cement Production plant limitations. Both scenarios show CO2 savings when compared to the Clinker Production without substitution. The mid-point and end-point analysis were favourable to the fuel substitution with savings ranging from 3 to 7% compared to the raw material substitution and also to base case without substitution. The influence of the amount of sewage sludge used for both scenarios indicates that fuel substitution reduced the CO2 emissions when the amount of substitution is increased, while other mid-point and end-point categories were proportionally favourable to the fuel substitution scenario. Additionally, the influence of the substituted material characteristics showed that low heating value (fuel substitution) and CaO addition in lime stabilized sludge (raw material substitution) are critical parameters in terms of environmental impact in Clinker Production. The fuel substitution represents a significant environmental improvement compared to the raw material substitution scenario and Clinker Production without substitution.

  • Comparative LCA of sewage sludge valorisation as both fuel and raw material substitute in Clinker Production
    Journal of Cleaner Production, 2013
    Co-Authors: Cesar Valderrama, Manel Guillem, Ricard Granados, Carles M. Gasol, José Luis Cortina, Alejandro Josa
    Abstract:

    A life cycle assessment to evaluate the environmental impact of urban sewage sludge use as alternative fuel or raw material in Clinker Production was carried out. In order to quantify in detail the overall environmental impact of both scenarios, the sewage sludge treatment process and the transport to cement facilities for both alternatives were considered. The substitution ratio of fuel (petcoke) and raw material (limestone) was fixed between 5 and 15% according to the cement Production plant limitations. Both scenarios show CO2 savings when compared to the Clinker Production without substitution. The mid-point and end-point analysis were favourable to the fuel substitution with savings ranging from 3 to 7% compared to the raw material substitution and also to base case without substitution. The influence of the amount of sewage sludge used for both scenarios indicates that fuel substitution reduced the CO2 emissions when the amount of substitution is increased, while other mid-point and end-point categories were proportionally favourable to the fuel substitution scenario. Additionally, the influence of the substituted material characteristics showed that low heating value (fuel substitution) and CaO addition in lime stabilized sludge (raw material substitution) are critical parameters in terms of environmental impact in Clinker Production. The fuel substitution represents a significant environmental improvement compared to the raw material substitution scenario and Clinker Production without substitution. © 2013 Elsevier Ltd. All rights reserved.