The Experts below are selected from a list of 171 Experts worldwide ranked by ideXlab platform
Toshinori Kojima - One of the best experts on this subject based on the ideXlab platform.
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production of cement clinkers from municipal solid waste incineration mswi fly ash
Waste Management, 2007Co-Authors: Nabajyoti Saikia, Shigeru Kato, Toshinori KojimaAbstract:This communication reports the laboratory scale study on the production of cement clinkers from two types of municipal solid waste incineration fly ash (MSW ash) samples. XRD technique was used to monitor the phase formation during the burning of the raw mixes. The amount of trace elements volatilized during Clinkerization and hydration, as well as leaching behaviours of the clinkers obtained from optimum compositions, were also evaluated. From the results it is observed that all of the major components of ordinary Portland cement (OPC) clinkers are present in the produced clinkers. Results also show the volatilization of considerable amounts of Na, K, Pb, Zn and Cd during the production of clinkers. However, major parts of the toxic elements remaining in the clinkers appear to be immobilized in the clinkers phases. Hydration studies of the clinkers obtained from optimum compositions show that the clinkers prepared from raw MSW ash are more reactive than the washed MSW ash based clinkers. TG/DTA analyses of the hydrated pastes show the formation of hydration products, which are generally found in OPC and OPC derived cements. The initial study, therefore, shows that more than 44% of MSW ash with the addition of very small amounts of silica and iron oxide can be used to produce cement clinkers. The amount of CaCO3 necessary to produce clinkers (approximately 50%) is also smaller than the same required for the conventional process (more than 70%).
Lei Wang - One of the best experts on this subject based on the ideXlab platform.
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immobilization of trace elements in municipal solid waste incinerator mswi fly ash by producing calcium sulphoaluminate cement after carbonation and washing
Waste Management & Research, 2016Co-Authors: Lei Wang, Imtiaz Ali Jamro, Qi Chen, Jingde Luan, Tianhua YangAbstract:The possibility of producing calcium sulphoaluminate cement (CSA) by adding municipal solid waste incinerator (MSWI) fly ash to raw meal was investigated. After subjecting MSWI fly ash to accelerated carbonation and washing with water (ACW), various amounts (i.e., 5, 10 and 15 wt%) of the treated ash were added to raw meal composed of a mixture of bauxite, limestone and gypsum. The mixtures were sintered in a laboratory-scale muffle furnace at temperatures of 1250°, 1300°, 1325° and 1350 °C for various durations. The influence of different quantities of MSWI fly ash on the mineralogy, major phase composition and strength development of the resulting clinker was studied, as was the effect of ash treatments on leaching and volatilization of trace elements. The ACW treatment reduced the volatilization ratio of trace elements during the Clinkerization process. Volatilization ratios for lead, cadmium and zinc were 21.5%, 33.6% and 16.3%, respectively, from the ACW fly ash treatment, compared with ratios of 97.5%, 93.1% and 85.2% from untreated fly ash. The volatilization ratios of trace elements were ordered as follows: untreated fly ash > carbonated fly ash > carbonated and water-washed fly ash. The ACW process also reduced the chloride content in the MSWI fly ash by 90 wt% and prevented high concentrations of trace elements in the effluents.
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recycling of municipal solid waste incineration fly ash for ordinary portland cement production a real scale test
Resources Conservation and Recycling, 2010Co-Authors: Lei Wang, Yiying Jin, Yongfeng NieAbstract:Abstract The study present in this paper investigates the feasibility of clinker production using water washed MSWI (municipal solid waste incineration) fly ash in addition to cement raw materials. The tested fly ashes were washed and reused as raw material (with dosage of 1% of cement raw material (w/w)). The optimization of the MSWI fly ash washing process was carried out to maximum the extraction of chloride and sulphate. Taking into account economic parameters such as the consumption of water, reaction time and easy operation, the best relation found was a liquid/solid ratio (L/S) of 10/1 during 1/6 h. Pure CO 2 , used to simulate the cement kiln dust gas, was bubbled into the water effluent to decrease the pH by the formation of CaCO 3 . In these conditions, the concentration of heavy metals will decrease as a consequence of the co-precipitation with CaCO 3 . XRD technique was used to monitor the phase formation during the burning of the mixture of MSWI fly ash and cement raw materials. The amounts of trace elements volatilized during Clinkerization, as well as leaching behaviours of the clinkers, were also evaluated. After the lab-scale experiments to confirm the efficacy of this technology, a real-scale test (3000 tonnes/day) was conducted. The quality of the resulting cement is sufficient to enable the cement to be put to practical use.
Yongfeng Nie - One of the best experts on this subject based on the ideXlab platform.
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recycling of municipal solid waste incineration fly ash for ordinary portland cement production a real scale test
Resources Conservation and Recycling, 2010Co-Authors: Lei Wang, Yiying Jin, Yongfeng NieAbstract:Abstract The study present in this paper investigates the feasibility of clinker production using water washed MSWI (municipal solid waste incineration) fly ash in addition to cement raw materials. The tested fly ashes were washed and reused as raw material (with dosage of 1% of cement raw material (w/w)). The optimization of the MSWI fly ash washing process was carried out to maximum the extraction of chloride and sulphate. Taking into account economic parameters such as the consumption of water, reaction time and easy operation, the best relation found was a liquid/solid ratio (L/S) of 10/1 during 1/6 h. Pure CO 2 , used to simulate the cement kiln dust gas, was bubbled into the water effluent to decrease the pH by the formation of CaCO 3 . In these conditions, the concentration of heavy metals will decrease as a consequence of the co-precipitation with CaCO 3 . XRD technique was used to monitor the phase formation during the burning of the mixture of MSWI fly ash and cement raw materials. The amounts of trace elements volatilized during Clinkerization, as well as leaching behaviours of the clinkers, were also evaluated. After the lab-scale experiments to confirm the efficacy of this technology, a real-scale test (3000 tonnes/day) was conducted. The quality of the resulting cement is sufficient to enable the cement to be put to practical use.
Nabajyoti Saikia - One of the best experts on this subject based on the ideXlab platform.
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production of cement clinkers from municipal solid waste incineration mswi fly ash
Waste Management, 2007Co-Authors: Nabajyoti Saikia, Shigeru Kato, Toshinori KojimaAbstract:This communication reports the laboratory scale study on the production of cement clinkers from two types of municipal solid waste incineration fly ash (MSW ash) samples. XRD technique was used to monitor the phase formation during the burning of the raw mixes. The amount of trace elements volatilized during Clinkerization and hydration, as well as leaching behaviours of the clinkers obtained from optimum compositions, were also evaluated. From the results it is observed that all of the major components of ordinary Portland cement (OPC) clinkers are present in the produced clinkers. Results also show the volatilization of considerable amounts of Na, K, Pb, Zn and Cd during the production of clinkers. However, major parts of the toxic elements remaining in the clinkers appear to be immobilized in the clinkers phases. Hydration studies of the clinkers obtained from optimum compositions show that the clinkers prepared from raw MSW ash are more reactive than the washed MSW ash based clinkers. TG/DTA analyses of the hydrated pastes show the formation of hydration products, which are generally found in OPC and OPC derived cements. The initial study, therefore, shows that more than 44% of MSW ash with the addition of very small amounts of silica and iron oxide can be used to produce cement clinkers. The amount of CaCO3 necessary to produce clinkers (approximately 50%) is also smaller than the same required for the conventional process (more than 70%).
Shigeru Kato - One of the best experts on this subject based on the ideXlab platform.
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production of cement clinkers from municipal solid waste incineration mswi fly ash
Waste Management, 2007Co-Authors: Nabajyoti Saikia, Shigeru Kato, Toshinori KojimaAbstract:This communication reports the laboratory scale study on the production of cement clinkers from two types of municipal solid waste incineration fly ash (MSW ash) samples. XRD technique was used to monitor the phase formation during the burning of the raw mixes. The amount of trace elements volatilized during Clinkerization and hydration, as well as leaching behaviours of the clinkers obtained from optimum compositions, were also evaluated. From the results it is observed that all of the major components of ordinary Portland cement (OPC) clinkers are present in the produced clinkers. Results also show the volatilization of considerable amounts of Na, K, Pb, Zn and Cd during the production of clinkers. However, major parts of the toxic elements remaining in the clinkers appear to be immobilized in the clinkers phases. Hydration studies of the clinkers obtained from optimum compositions show that the clinkers prepared from raw MSW ash are more reactive than the washed MSW ash based clinkers. TG/DTA analyses of the hydrated pastes show the formation of hydration products, which are generally found in OPC and OPC derived cements. The initial study, therefore, shows that more than 44% of MSW ash with the addition of very small amounts of silica and iron oxide can be used to produce cement clinkers. The amount of CaCO3 necessary to produce clinkers (approximately 50%) is also smaller than the same required for the conventional process (more than 70%).