The Experts below are selected from a list of 3045 Experts worldwide ranked by ideXlab platform
Kiyoshi Okada - One of the best experts on this subject based on the ideXlab platform.
-
utilization of steel Making Slag for the uptake of ammonium and phosphate ions from aqueous solution
Journal of Hazardous Materials, 2008Co-Authors: Vinay Kumar Jha, Yoshikazu Kameshima, Akira Nakajima, Kiyoshi OkadaAbstract:Abstract Steel-Making Slag, a waste by-product of the Steel Industry, constitutes a major disposal problem. In the present study, excellent adsorbent materials for reducing eutrophication in wastewaters have been prepared from this Slag. Heated samples of acid-treated Slag and mixtures of Slag with kaolinite and Al(OH) 3 were examined to determine their uptake capacities for NH 4 + and PO 4 3− from aqueous solutions. In general, the equilibrium pH of the solution increased in comparison to initial pH with the uptake of target ions, the sample activated Slag-Al(OH) 3 showing the smallest change. The highest PO 4 3− uptake capacity was obtained with the Slag-Al(OH) 3 mixture heated at 900 °C whereas the highest uptake of NH 4 + was found in the Slag-Al(OH) 3 mixture heated at 800 °C. The uptake rates for PO 4 3− and NH 4 + by the Slag-Al(OH) 3 mixture heated at 900 °C were 2.91 and 0.65 μmol/(g min), respectively. It was shown that heating Slag composites prior to incorporation into wastewater treatment filters resulted in an increased degree of NH 4 + and PO 4 3− uptake.
-
Utilization of steel-Making Slag for the uptake of ammonium and phosphate ions from aqueous solution.
Journal of hazardous materials, 2007Co-Authors: Vinay Kumar Jha, Yoshikazu Kameshima, Akira Nakajima, Kiyoshi OkadaAbstract:Steel-Making Slag, a waste by-product of the Steel Industry, constitutes a major disposal problem. In the present study, excellent adsorbent materials for reducing eutrophication in wastewaters have been prepared from this Slag. Heated samples of acid-treated Slag and mixtures of Slag with kaolinite and Al(OH)(3) were examined to determine their uptake capacities for NH(4)(+) and PO(4)(3-) from aqueous solutions. In general, the equilibrium pH of the solution increased in comparison to initial pH with the uptake of target ions, the sample activated Slag-Al(OH)(3) showing the smallest change. The highest PO(4)(3-) uptake capacity was obtained with the Slag-Al(OH)(3) mixture heated at 900 degrees C whereas the highest uptake of NH(4)(+) was found in the Slag-Al(OH)(3) mixture heated at 800 degrees C. The uptake rates for PO(4)(3-) and NH(4)(+) by the Slag-Al(OH)(3) mixture heated at 900 degrees C were 2.91 and 0.65 micro mol/(g min), respectively. It was shown that heating Slag composites prior to incorporation into wastewater treatment filters resulted in an increased degree of NH(4)(+) and PO(4)(3-) uptake.
-
Hazardous ions uptake behavior of thermally activated steel-Making Slag.
Journal of hazardous materials, 2004Co-Authors: Vinay Kumar Jha, Yoshikazu Kameshima, Akira Nakajima, Kiyoshi OkadaAbstract:This study concerns the utilization of waste steel-Making Slag, a by-product that contains mainly CaO, Fe(2)O(3) and SiO(2). The as-received Slag was ground and thermally activated by temperature treatment from 110 to 1000 degrees C for 24 h. Although the as-received Slag was amorphous, it became partially crystallized during grinding. These crystalline phases were larnite and iron oxide but other crystalline phases also appeared in addition to larnite after calcination. The uptake of Ni(2+), PO(4)(3-) and NH(4)(+) by the samples was investigated from solutions with initial concentrations of 10 mmol/l. The sample calcined at 800 degrees C showed the highest Ni(2+) uptake (4.85 mmol/g) whereas the highest simultaneous uptake of PO(4)(3-) (2.75 mmol/g) and NH(4)(+) (0.25 mmol/g) was achieved by calcining the material at 700 degrees C. The principal mechanism of Ni(2+) uptake is thought to involve replacement of Ca(2+) by Ni(2+). The mechanism of PO(4)(3-) uptake is mainly by formation of calcium phosphate while that of NH(4)(+) involves sorption by the porous silica surface of the samples.
-
Hazardous ions uptake behavior of thermally activated steel-Making Slag.
Journal of Hazardous Materials, 2004Co-Authors: Vinay Kumar Jha, Yoshikazu Kameshima, Akira Nakajima, Kiyoshi OkadaAbstract:Abstract This study concerns the utilization of waste steel-Making Slag, a by-product that contains mainly CaO, Fe2O3 and SiO2. The as-received Slag was ground and thermally activated by temperature treatment from 110 to 1000 °C for 24 h. Although the as-received Slag was amorphous, it became partially crystallized during grinding. These crystalline phases were larnite and iron oxide but other crystalline phases also appeared in addition to larnite after calcination. The uptake of Ni2+, PO43− and NH4+ by the samples was investigated from solutions with initial concentrations of 10 mmol/l. The sample calcined at 800 °C showed the highest Ni2+ uptake (4.85 mmol/g) whereas the highest simultaneous uptake of PO43− (2.75 mmol/g) and NH4+ (0.25 mmol/g) was achieved by calcining the material at 700 °C. The principal mechanism of Ni2+ uptake is thought to involve replacement of Ca2+ by Ni2+. The mechanism of PO43− uptake is mainly by formation of calcium phosphate while that of NH4+ involves sorption by the porous silica surface of the samples.
Vinay Kumar Jha - One of the best experts on this subject based on the ideXlab platform.
-
utilization of steel Making Slag for the uptake of ammonium and phosphate ions from aqueous solution
Journal of Hazardous Materials, 2008Co-Authors: Vinay Kumar Jha, Yoshikazu Kameshima, Akira Nakajima, Kiyoshi OkadaAbstract:Abstract Steel-Making Slag, a waste by-product of the Steel Industry, constitutes a major disposal problem. In the present study, excellent adsorbent materials for reducing eutrophication in wastewaters have been prepared from this Slag. Heated samples of acid-treated Slag and mixtures of Slag with kaolinite and Al(OH) 3 were examined to determine their uptake capacities for NH 4 + and PO 4 3− from aqueous solutions. In general, the equilibrium pH of the solution increased in comparison to initial pH with the uptake of target ions, the sample activated Slag-Al(OH) 3 showing the smallest change. The highest PO 4 3− uptake capacity was obtained with the Slag-Al(OH) 3 mixture heated at 900 °C whereas the highest uptake of NH 4 + was found in the Slag-Al(OH) 3 mixture heated at 800 °C. The uptake rates for PO 4 3− and NH 4 + by the Slag-Al(OH) 3 mixture heated at 900 °C were 2.91 and 0.65 μmol/(g min), respectively. It was shown that heating Slag composites prior to incorporation into wastewater treatment filters resulted in an increased degree of NH 4 + and PO 4 3− uptake.
-
Utilization of steel-Making Slag for the uptake of ammonium and phosphate ions from aqueous solution.
Journal of hazardous materials, 2007Co-Authors: Vinay Kumar Jha, Yoshikazu Kameshima, Akira Nakajima, Kiyoshi OkadaAbstract:Steel-Making Slag, a waste by-product of the Steel Industry, constitutes a major disposal problem. In the present study, excellent adsorbent materials for reducing eutrophication in wastewaters have been prepared from this Slag. Heated samples of acid-treated Slag and mixtures of Slag with kaolinite and Al(OH)(3) were examined to determine their uptake capacities for NH(4)(+) and PO(4)(3-) from aqueous solutions. In general, the equilibrium pH of the solution increased in comparison to initial pH with the uptake of target ions, the sample activated Slag-Al(OH)(3) showing the smallest change. The highest PO(4)(3-) uptake capacity was obtained with the Slag-Al(OH)(3) mixture heated at 900 degrees C whereas the highest uptake of NH(4)(+) was found in the Slag-Al(OH)(3) mixture heated at 800 degrees C. The uptake rates for PO(4)(3-) and NH(4)(+) by the Slag-Al(OH)(3) mixture heated at 900 degrees C were 2.91 and 0.65 micro mol/(g min), respectively. It was shown that heating Slag composites prior to incorporation into wastewater treatment filters resulted in an increased degree of NH(4)(+) and PO(4)(3-) uptake.
-
Hazardous ions uptake behavior of thermally activated steel-Making Slag.
Journal of hazardous materials, 2004Co-Authors: Vinay Kumar Jha, Yoshikazu Kameshima, Akira Nakajima, Kiyoshi OkadaAbstract:This study concerns the utilization of waste steel-Making Slag, a by-product that contains mainly CaO, Fe(2)O(3) and SiO(2). The as-received Slag was ground and thermally activated by temperature treatment from 110 to 1000 degrees C for 24 h. Although the as-received Slag was amorphous, it became partially crystallized during grinding. These crystalline phases were larnite and iron oxide but other crystalline phases also appeared in addition to larnite after calcination. The uptake of Ni(2+), PO(4)(3-) and NH(4)(+) by the samples was investigated from solutions with initial concentrations of 10 mmol/l. The sample calcined at 800 degrees C showed the highest Ni(2+) uptake (4.85 mmol/g) whereas the highest simultaneous uptake of PO(4)(3-) (2.75 mmol/g) and NH(4)(+) (0.25 mmol/g) was achieved by calcining the material at 700 degrees C. The principal mechanism of Ni(2+) uptake is thought to involve replacement of Ca(2+) by Ni(2+). The mechanism of PO(4)(3-) uptake is mainly by formation of calcium phosphate while that of NH(4)(+) involves sorption by the porous silica surface of the samples.
-
Hazardous ions uptake behavior of thermally activated steel-Making Slag.
Journal of Hazardous Materials, 2004Co-Authors: Vinay Kumar Jha, Yoshikazu Kameshima, Akira Nakajima, Kiyoshi OkadaAbstract:Abstract This study concerns the utilization of waste steel-Making Slag, a by-product that contains mainly CaO, Fe2O3 and SiO2. The as-received Slag was ground and thermally activated by temperature treatment from 110 to 1000 °C for 24 h. Although the as-received Slag was amorphous, it became partially crystallized during grinding. These crystalline phases were larnite and iron oxide but other crystalline phases also appeared in addition to larnite after calcination. The uptake of Ni2+, PO43− and NH4+ by the samples was investigated from solutions with initial concentrations of 10 mmol/l. The sample calcined at 800 °C showed the highest Ni2+ uptake (4.85 mmol/g) whereas the highest simultaneous uptake of PO43− (2.75 mmol/g) and NH4+ (0.25 mmol/g) was achieved by calcining the material at 700 °C. The principal mechanism of Ni2+ uptake is thought to involve replacement of Ca2+ by Ni2+. The mechanism of PO43− uptake is mainly by formation of calcium phosphate while that of NH4+ involves sorption by the porous silica surface of the samples.
Akira Nakajima - One of the best experts on this subject based on the ideXlab platform.
-
utilization of steel Making Slag for the uptake of ammonium and phosphate ions from aqueous solution
Journal of Hazardous Materials, 2008Co-Authors: Vinay Kumar Jha, Yoshikazu Kameshima, Akira Nakajima, Kiyoshi OkadaAbstract:Abstract Steel-Making Slag, a waste by-product of the Steel Industry, constitutes a major disposal problem. In the present study, excellent adsorbent materials for reducing eutrophication in wastewaters have been prepared from this Slag. Heated samples of acid-treated Slag and mixtures of Slag with kaolinite and Al(OH) 3 were examined to determine their uptake capacities for NH 4 + and PO 4 3− from aqueous solutions. In general, the equilibrium pH of the solution increased in comparison to initial pH with the uptake of target ions, the sample activated Slag-Al(OH) 3 showing the smallest change. The highest PO 4 3− uptake capacity was obtained with the Slag-Al(OH) 3 mixture heated at 900 °C whereas the highest uptake of NH 4 + was found in the Slag-Al(OH) 3 mixture heated at 800 °C. The uptake rates for PO 4 3− and NH 4 + by the Slag-Al(OH) 3 mixture heated at 900 °C were 2.91 and 0.65 μmol/(g min), respectively. It was shown that heating Slag composites prior to incorporation into wastewater treatment filters resulted in an increased degree of NH 4 + and PO 4 3− uptake.
-
Utilization of steel-Making Slag for the uptake of ammonium and phosphate ions from aqueous solution.
Journal of hazardous materials, 2007Co-Authors: Vinay Kumar Jha, Yoshikazu Kameshima, Akira Nakajima, Kiyoshi OkadaAbstract:Steel-Making Slag, a waste by-product of the Steel Industry, constitutes a major disposal problem. In the present study, excellent adsorbent materials for reducing eutrophication in wastewaters have been prepared from this Slag. Heated samples of acid-treated Slag and mixtures of Slag with kaolinite and Al(OH)(3) were examined to determine their uptake capacities for NH(4)(+) and PO(4)(3-) from aqueous solutions. In general, the equilibrium pH of the solution increased in comparison to initial pH with the uptake of target ions, the sample activated Slag-Al(OH)(3) showing the smallest change. The highest PO(4)(3-) uptake capacity was obtained with the Slag-Al(OH)(3) mixture heated at 900 degrees C whereas the highest uptake of NH(4)(+) was found in the Slag-Al(OH)(3) mixture heated at 800 degrees C. The uptake rates for PO(4)(3-) and NH(4)(+) by the Slag-Al(OH)(3) mixture heated at 900 degrees C were 2.91 and 0.65 micro mol/(g min), respectively. It was shown that heating Slag composites prior to incorporation into wastewater treatment filters resulted in an increased degree of NH(4)(+) and PO(4)(3-) uptake.
-
Hazardous ions uptake behavior of thermally activated steel-Making Slag.
Journal of hazardous materials, 2004Co-Authors: Vinay Kumar Jha, Yoshikazu Kameshima, Akira Nakajima, Kiyoshi OkadaAbstract:This study concerns the utilization of waste steel-Making Slag, a by-product that contains mainly CaO, Fe(2)O(3) and SiO(2). The as-received Slag was ground and thermally activated by temperature treatment from 110 to 1000 degrees C for 24 h. Although the as-received Slag was amorphous, it became partially crystallized during grinding. These crystalline phases were larnite and iron oxide but other crystalline phases also appeared in addition to larnite after calcination. The uptake of Ni(2+), PO(4)(3-) and NH(4)(+) by the samples was investigated from solutions with initial concentrations of 10 mmol/l. The sample calcined at 800 degrees C showed the highest Ni(2+) uptake (4.85 mmol/g) whereas the highest simultaneous uptake of PO(4)(3-) (2.75 mmol/g) and NH(4)(+) (0.25 mmol/g) was achieved by calcining the material at 700 degrees C. The principal mechanism of Ni(2+) uptake is thought to involve replacement of Ca(2+) by Ni(2+). The mechanism of PO(4)(3-) uptake is mainly by formation of calcium phosphate while that of NH(4)(+) involves sorption by the porous silica surface of the samples.
-
Hazardous ions uptake behavior of thermally activated steel-Making Slag.
Journal of Hazardous Materials, 2004Co-Authors: Vinay Kumar Jha, Yoshikazu Kameshima, Akira Nakajima, Kiyoshi OkadaAbstract:Abstract This study concerns the utilization of waste steel-Making Slag, a by-product that contains mainly CaO, Fe2O3 and SiO2. The as-received Slag was ground and thermally activated by temperature treatment from 110 to 1000 °C for 24 h. Although the as-received Slag was amorphous, it became partially crystallized during grinding. These crystalline phases were larnite and iron oxide but other crystalline phases also appeared in addition to larnite after calcination. The uptake of Ni2+, PO43− and NH4+ by the samples was investigated from solutions with initial concentrations of 10 mmol/l. The sample calcined at 800 °C showed the highest Ni2+ uptake (4.85 mmol/g) whereas the highest simultaneous uptake of PO43− (2.75 mmol/g) and NH4+ (0.25 mmol/g) was achieved by calcining the material at 700 °C. The principal mechanism of Ni2+ uptake is thought to involve replacement of Ca2+ by Ni2+. The mechanism of PO43− uptake is mainly by formation of calcium phosphate while that of NH4+ involves sorption by the porous silica surface of the samples.
Yoshikazu Kameshima - One of the best experts on this subject based on the ideXlab platform.
-
utilization of steel Making Slag for the uptake of ammonium and phosphate ions from aqueous solution
Journal of Hazardous Materials, 2008Co-Authors: Vinay Kumar Jha, Yoshikazu Kameshima, Akira Nakajima, Kiyoshi OkadaAbstract:Abstract Steel-Making Slag, a waste by-product of the Steel Industry, constitutes a major disposal problem. In the present study, excellent adsorbent materials for reducing eutrophication in wastewaters have been prepared from this Slag. Heated samples of acid-treated Slag and mixtures of Slag with kaolinite and Al(OH) 3 were examined to determine their uptake capacities for NH 4 + and PO 4 3− from aqueous solutions. In general, the equilibrium pH of the solution increased in comparison to initial pH with the uptake of target ions, the sample activated Slag-Al(OH) 3 showing the smallest change. The highest PO 4 3− uptake capacity was obtained with the Slag-Al(OH) 3 mixture heated at 900 °C whereas the highest uptake of NH 4 + was found in the Slag-Al(OH) 3 mixture heated at 800 °C. The uptake rates for PO 4 3− and NH 4 + by the Slag-Al(OH) 3 mixture heated at 900 °C were 2.91 and 0.65 μmol/(g min), respectively. It was shown that heating Slag composites prior to incorporation into wastewater treatment filters resulted in an increased degree of NH 4 + and PO 4 3− uptake.
-
Utilization of steel-Making Slag for the uptake of ammonium and phosphate ions from aqueous solution.
Journal of hazardous materials, 2007Co-Authors: Vinay Kumar Jha, Yoshikazu Kameshima, Akira Nakajima, Kiyoshi OkadaAbstract:Steel-Making Slag, a waste by-product of the Steel Industry, constitutes a major disposal problem. In the present study, excellent adsorbent materials for reducing eutrophication in wastewaters have been prepared from this Slag. Heated samples of acid-treated Slag and mixtures of Slag with kaolinite and Al(OH)(3) were examined to determine their uptake capacities for NH(4)(+) and PO(4)(3-) from aqueous solutions. In general, the equilibrium pH of the solution increased in comparison to initial pH with the uptake of target ions, the sample activated Slag-Al(OH)(3) showing the smallest change. The highest PO(4)(3-) uptake capacity was obtained with the Slag-Al(OH)(3) mixture heated at 900 degrees C whereas the highest uptake of NH(4)(+) was found in the Slag-Al(OH)(3) mixture heated at 800 degrees C. The uptake rates for PO(4)(3-) and NH(4)(+) by the Slag-Al(OH)(3) mixture heated at 900 degrees C were 2.91 and 0.65 micro mol/(g min), respectively. It was shown that heating Slag composites prior to incorporation into wastewater treatment filters resulted in an increased degree of NH(4)(+) and PO(4)(3-) uptake.
-
Hazardous ions uptake behavior of thermally activated steel-Making Slag.
Journal of hazardous materials, 2004Co-Authors: Vinay Kumar Jha, Yoshikazu Kameshima, Akira Nakajima, Kiyoshi OkadaAbstract:This study concerns the utilization of waste steel-Making Slag, a by-product that contains mainly CaO, Fe(2)O(3) and SiO(2). The as-received Slag was ground and thermally activated by temperature treatment from 110 to 1000 degrees C for 24 h. Although the as-received Slag was amorphous, it became partially crystallized during grinding. These crystalline phases were larnite and iron oxide but other crystalline phases also appeared in addition to larnite after calcination. The uptake of Ni(2+), PO(4)(3-) and NH(4)(+) by the samples was investigated from solutions with initial concentrations of 10 mmol/l. The sample calcined at 800 degrees C showed the highest Ni(2+) uptake (4.85 mmol/g) whereas the highest simultaneous uptake of PO(4)(3-) (2.75 mmol/g) and NH(4)(+) (0.25 mmol/g) was achieved by calcining the material at 700 degrees C. The principal mechanism of Ni(2+) uptake is thought to involve replacement of Ca(2+) by Ni(2+). The mechanism of PO(4)(3-) uptake is mainly by formation of calcium phosphate while that of NH(4)(+) involves sorption by the porous silica surface of the samples.
-
Hazardous ions uptake behavior of thermally activated steel-Making Slag.
Journal of Hazardous Materials, 2004Co-Authors: Vinay Kumar Jha, Yoshikazu Kameshima, Akira Nakajima, Kiyoshi OkadaAbstract:Abstract This study concerns the utilization of waste steel-Making Slag, a by-product that contains mainly CaO, Fe2O3 and SiO2. The as-received Slag was ground and thermally activated by temperature treatment from 110 to 1000 °C for 24 h. Although the as-received Slag was amorphous, it became partially crystallized during grinding. These crystalline phases were larnite and iron oxide but other crystalline phases also appeared in addition to larnite after calcination. The uptake of Ni2+, PO43− and NH4+ by the samples was investigated from solutions with initial concentrations of 10 mmol/l. The sample calcined at 800 °C showed the highest Ni2+ uptake (4.85 mmol/g) whereas the highest simultaneous uptake of PO43− (2.75 mmol/g) and NH4+ (0.25 mmol/g) was achieved by calcining the material at 700 °C. The principal mechanism of Ni2+ uptake is thought to involve replacement of Ca2+ by Ni2+. The mechanism of PO43− uptake is mainly by formation of calcium phosphate while that of NH4+ involves sorption by the porous silica surface of the samples.
Şadi Karagöz - One of the best experts on this subject based on the ideXlab platform.
-
concrete produced by steel Making Slag basic oxygen furnace addition in portland cement
International Journal of Applied Ceramic Technology, 2009Co-Authors: Hasan Alanyali, Mustafa Çöl, Muharrem Yilmaz, Şadi KaragözAbstract:A steel-Making Slag (basic oxygen furnace) obtained from the Kardemir Steelworks was modified to be used as a clinker additive in the cement industry. This study confirmed that the compressive strength values of concretes produced by addition of these steel-Making Slags up to 30mass% were within the values of Grade-325 and Grade-425 steel-Making Slag cement. This is an attractive alternative for cement manufacturers, because calcined material is expensive, and Slag substitutes are very often cheaper, in addition to its low or zero-greenhouse-gas emission.
-
Concrete Produced by Steel‐Making Slag (Basic Oxygen Furnace) Addition in Portland Cement
International Journal of Applied Ceramic Technology, 2009Co-Authors: Hasan Alanyali, Mustafa Çöl, Muharrem Yilmaz, Şadi KaragözAbstract:A steel-Making Slag (basic oxygen furnace) obtained from the Kardemir Steelworks was modified to be used as a clinker additive in the cement industry. This study confirmed that the compressive strength values of concretes produced by addition of these steel-Making Slags up to 30mass% were within the values of Grade-325 and Grade-425 steel-Making Slag cement. This is an attractive alternative for cement manufacturers, because calcined material is expensive, and Slag substitutes are very often cheaper, in addition to its low or zero-greenhouse-gas emission.
