The Experts below are selected from a list of 462 Experts worldwide ranked by ideXlab platform

Van Acker Karel - One of the best experts on this subject based on the ideXlab platform.

  • Environmental benefits of industrial symbiosis for steel industry: Application of stainless steel slag
    Brussels, 2015
    Co-Authors: Di Maria Andrea, Salman, Muhammad Salman, Dubois Maarten, Van Acker Karel
    Abstract:

    The Iron and steel industry is a key sector in the implementation of the Circular Economy (CE) and Industrial Symbiosis (IS). It encompasses an intensive material/energy consuming process, with cross-linked input/output flows [1]. A wide literature is available on strategies for CE and IS in steel industry, like the recovery of flue gas and steam to nearby industries and Blast Furnace Slag (BFS) in cement industries [1, 2]. Despite the successful implementation of these strategies, there is a need for research focused on the valorisation of other steel production residues, whose potential for recycling is not explored at present. The current study presents an environmental evaluation of a novel process aiming at the recycling of Stainless Steel Slag (SSS) as a binder for the production of construction materials. SSS, a residue from the stainless steel production, is usually treated and disposed as an hazardous waste or recycled (after stabilization) as low-quality aggregates. Since chromium is used in the production of stainless steel alloy, a fraction of it appears also in the slag, together with other heavy metals, posing environmental and health threats [2]. In particular Argon Oxygen Decarburation (AOD) slag, produced during the refining process of stainless steel, presents a dusty texture (in the scale of some µm diameter) that makes the handling of the slag difficult. Treatments including the addition of boric oxide, aimed at preventing the disintegration of the slag, have been tested and successfully implemented in industry [3].However due to costly and energy intensive processes, hazardous content (Cr), additives (boron) and low-value final product, research for more sustainable solutions is needed [4]. The chemical composition of AOD slag is similar to BFS, having analogous cementation characteristics [5]. Some studies [5,6] have discussed the possibility of applying AOD slag to produce new binders by means of different processes, among which thermo alkali-activation is a very promising option. It involves the activation of the binding property of SSS through the use of alkali silicate compounds and high temperature. The resulting product ensures a safety immobilization of the hazardous components of the slag, which are trapped within its stable matrix. Furthermore, the dusty texture of AOD slag increases the efficiency of the binding process since it generates sufficient reactive surface area, hence foregoing the need of stabilization by boron addition [4]. For the presented study, two different Blocks (called S-Blocks) were developed through Alkali- Activation using AOD slag as binder: 1) Solid S-Block- with similar characteristic of paver concrete Block and 2) Aerated S-Block- with a porous internal structure resembling to traditional Aerated Block. Both S- Blocks were produced by mixing AOD slag with river sand at 1:3 wt ratio and a mixture of Na/K hydroxides and Na/K silicates. Subsequently they were cured in a steam curing chamber to enhance the hardening process. For solid Block the steam curing temperature was maintained at 90°C at atmospheric pressure, whereas the Aerated Block was cured at 150°C and 4 bar pressure. 0,05 wt% aluminium powder was used to generate air voids within the Aerated S-Block. The purpose of this study is to analyse the environmental performances and economic benefits for the production of S-Blocks, in order to highlight the main gains and drawbacks of this new possible industrial application.status: publishe

Di Maria Andrea - One of the best experts on this subject based on the ideXlab platform.

  • Environmental benefits of industrial symbiosis for steel industry: Application of stainless steel slag
    Brussels, 2015
    Co-Authors: Di Maria Andrea, Salman, Muhammad Salman, Dubois Maarten, Van Acker Karel
    Abstract:

    The Iron and steel industry is a key sector in the implementation of the Circular Economy (CE) and Industrial Symbiosis (IS). It encompasses an intensive material/energy consuming process, with cross-linked input/output flows [1]. A wide literature is available on strategies for CE and IS in steel industry, like the recovery of flue gas and steam to nearby industries and Blast Furnace Slag (BFS) in cement industries [1, 2]. Despite the successful implementation of these strategies, there is a need for research focused on the valorisation of other steel production residues, whose potential for recycling is not explored at present. The current study presents an environmental evaluation of a novel process aiming at the recycling of Stainless Steel Slag (SSS) as a binder for the production of construction materials. SSS, a residue from the stainless steel production, is usually treated and disposed as an hazardous waste or recycled (after stabilization) as low-quality aggregates. Since chromium is used in the production of stainless steel alloy, a fraction of it appears also in the slag, together with other heavy metals, posing environmental and health threats [2]. In particular Argon Oxygen Decarburation (AOD) slag, produced during the refining process of stainless steel, presents a dusty texture (in the scale of some µm diameter) that makes the handling of the slag difficult. Treatments including the addition of boric oxide, aimed at preventing the disintegration of the slag, have been tested and successfully implemented in industry [3].However due to costly and energy intensive processes, hazardous content (Cr), additives (boron) and low-value final product, research for more sustainable solutions is needed [4]. The chemical composition of AOD slag is similar to BFS, having analogous cementation characteristics [5]. Some studies [5,6] have discussed the possibility of applying AOD slag to produce new binders by means of different processes, among which thermo alkali-activation is a very promising option. It involves the activation of the binding property of SSS through the use of alkali silicate compounds and high temperature. The resulting product ensures a safety immobilization of the hazardous components of the slag, which are trapped within its stable matrix. Furthermore, the dusty texture of AOD slag increases the efficiency of the binding process since it generates sufficient reactive surface area, hence foregoing the need of stabilization by boron addition [4]. For the presented study, two different Blocks (called S-Blocks) were developed through Alkali- Activation using AOD slag as binder: 1) Solid S-Block- with similar characteristic of paver concrete Block and 2) Aerated S-Block- with a porous internal structure resembling to traditional Aerated Block. Both S- Blocks were produced by mixing AOD slag with river sand at 1:3 wt ratio and a mixture of Na/K hydroxides and Na/K silicates. Subsequently they were cured in a steam curing chamber to enhance the hardening process. For solid Block the steam curing temperature was maintained at 90°C at atmospheric pressure, whereas the Aerated Block was cured at 150°C and 4 bar pressure. 0,05 wt% aluminium powder was used to generate air voids within the Aerated S-Block. The purpose of this study is to analyse the environmental performances and economic benefits for the production of S-Blocks, in order to highlight the main gains and drawbacks of this new possible industrial application.status: publishe

Umarali Abduraimov - One of the best experts on this subject based on the ideXlab platform.

Salman, Muhammad Salman - One of the best experts on this subject based on the ideXlab platform.

  • Environmental benefits of industrial symbiosis for steel industry: Application of stainless steel slag
    Brussels, 2015
    Co-Authors: Di Maria Andrea, Salman, Muhammad Salman, Dubois Maarten, Van Acker Karel
    Abstract:

    The Iron and steel industry is a key sector in the implementation of the Circular Economy (CE) and Industrial Symbiosis (IS). It encompasses an intensive material/energy consuming process, with cross-linked input/output flows [1]. A wide literature is available on strategies for CE and IS in steel industry, like the recovery of flue gas and steam to nearby industries and Blast Furnace Slag (BFS) in cement industries [1, 2]. Despite the successful implementation of these strategies, there is a need for research focused on the valorisation of other steel production residues, whose potential for recycling is not explored at present. The current study presents an environmental evaluation of a novel process aiming at the recycling of Stainless Steel Slag (SSS) as a binder for the production of construction materials. SSS, a residue from the stainless steel production, is usually treated and disposed as an hazardous waste or recycled (after stabilization) as low-quality aggregates. Since chromium is used in the production of stainless steel alloy, a fraction of it appears also in the slag, together with other heavy metals, posing environmental and health threats [2]. In particular Argon Oxygen Decarburation (AOD) slag, produced during the refining process of stainless steel, presents a dusty texture (in the scale of some µm diameter) that makes the handling of the slag difficult. Treatments including the addition of boric oxide, aimed at preventing the disintegration of the slag, have been tested and successfully implemented in industry [3].However due to costly and energy intensive processes, hazardous content (Cr), additives (boron) and low-value final product, research for more sustainable solutions is needed [4]. The chemical composition of AOD slag is similar to BFS, having analogous cementation characteristics [5]. Some studies [5,6] have discussed the possibility of applying AOD slag to produce new binders by means of different processes, among which thermo alkali-activation is a very promising option. It involves the activation of the binding property of SSS through the use of alkali silicate compounds and high temperature. The resulting product ensures a safety immobilization of the hazardous components of the slag, which are trapped within its stable matrix. Furthermore, the dusty texture of AOD slag increases the efficiency of the binding process since it generates sufficient reactive surface area, hence foregoing the need of stabilization by boron addition [4]. For the presented study, two different Blocks (called S-Blocks) were developed through Alkali- Activation using AOD slag as binder: 1) Solid S-Block- with similar characteristic of paver concrete Block and 2) Aerated S-Block- with a porous internal structure resembling to traditional Aerated Block. Both S- Blocks were produced by mixing AOD slag with river sand at 1:3 wt ratio and a mixture of Na/K hydroxides and Na/K silicates. Subsequently they were cured in a steam curing chamber to enhance the hardening process. For solid Block the steam curing temperature was maintained at 90°C at atmospheric pressure, whereas the Aerated Block was cured at 150°C and 4 bar pressure. 0,05 wt% aluminium powder was used to generate air voids within the Aerated S-Block. The purpose of this study is to analyse the environmental performances and economic benefits for the production of S-Blocks, in order to highlight the main gains and drawbacks of this new possible industrial application.status: publishe

Dubois Maarten - One of the best experts on this subject based on the ideXlab platform.

  • Environmental benefits of industrial symbiosis for steel industry: Application of stainless steel slag
    Brussels, 2015
    Co-Authors: Di Maria Andrea, Salman, Muhammad Salman, Dubois Maarten, Van Acker Karel
    Abstract:

    The Iron and steel industry is a key sector in the implementation of the Circular Economy (CE) and Industrial Symbiosis (IS). It encompasses an intensive material/energy consuming process, with cross-linked input/output flows [1]. A wide literature is available on strategies for CE and IS in steel industry, like the recovery of flue gas and steam to nearby industries and Blast Furnace Slag (BFS) in cement industries [1, 2]. Despite the successful implementation of these strategies, there is a need for research focused on the valorisation of other steel production residues, whose potential for recycling is not explored at present. The current study presents an environmental evaluation of a novel process aiming at the recycling of Stainless Steel Slag (SSS) as a binder for the production of construction materials. SSS, a residue from the stainless steel production, is usually treated and disposed as an hazardous waste or recycled (after stabilization) as low-quality aggregates. Since chromium is used in the production of stainless steel alloy, a fraction of it appears also in the slag, together with other heavy metals, posing environmental and health threats [2]. In particular Argon Oxygen Decarburation (AOD) slag, produced during the refining process of stainless steel, presents a dusty texture (in the scale of some µm diameter) that makes the handling of the slag difficult. Treatments including the addition of boric oxide, aimed at preventing the disintegration of the slag, have been tested and successfully implemented in industry [3].However due to costly and energy intensive processes, hazardous content (Cr), additives (boron) and low-value final product, research for more sustainable solutions is needed [4]. The chemical composition of AOD slag is similar to BFS, having analogous cementation characteristics [5]. Some studies [5,6] have discussed the possibility of applying AOD slag to produce new binders by means of different processes, among which thermo alkali-activation is a very promising option. It involves the activation of the binding property of SSS through the use of alkali silicate compounds and high temperature. The resulting product ensures a safety immobilization of the hazardous components of the slag, which are trapped within its stable matrix. Furthermore, the dusty texture of AOD slag increases the efficiency of the binding process since it generates sufficient reactive surface area, hence foregoing the need of stabilization by boron addition [4]. For the presented study, two different Blocks (called S-Blocks) were developed through Alkali- Activation using AOD slag as binder: 1) Solid S-Block- with similar characteristic of paver concrete Block and 2) Aerated S-Block- with a porous internal structure resembling to traditional Aerated Block. Both S- Blocks were produced by mixing AOD slag with river sand at 1:3 wt ratio and a mixture of Na/K hydroxides and Na/K silicates. Subsequently they were cured in a steam curing chamber to enhance the hardening process. For solid Block the steam curing temperature was maintained at 90°C at atmospheric pressure, whereas the Aerated Block was cured at 150°C and 4 bar pressure. 0,05 wt% aluminium powder was used to generate air voids within the Aerated S-Block. The purpose of this study is to analyse the environmental performances and economic benefits for the production of S-Blocks, in order to highlight the main gains and drawbacks of this new possible industrial application.status: publishe