The Experts below are selected from a list of 3633 Experts worldwide ranked by ideXlab platform
Navid R. Moheimani - One of the best experts on this subject based on the ideXlab platform.
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Tetraselmis suecica culture for CO2 bioremediation of untreated flue gas from a Coal-Fired Power Station
Journal of Applied Phycology, 2016Co-Authors: Navid R. MoheimaniAbstract:The accumulation of atmospheric CO2, primarily due to combustion of fossil fuels, has been implicated in potential global climate change. The high rate of CO2 bioremediation by microalgae has emerged as a favourable method for reducing Coal-Fired Power plant emissions. However, Coal-Fired Power Station flue gas contains other chemicals such as SOx which can inhibit microalgal growth. In the current study, the effect of untreated flue gas as a source of inorganic carbon on the growth of Tetraselmis in a 1000 L industrial-scale split-cylinder internal-loop airlift photobioreactor was examined. The culture medium was recycled after each harvest. Tetraselmis suecica grew very well in this airlift photobioreactor during the 7-month experiment using recycled medium from an electroflocculation harvesting unit. Increased medium SO42− concentration as high as 870 mg SO42− L−1 due to flue gas addition and media recycling had no negative effect on the overall growth and productivity of this alga. The potential organic biomass productivity and carbon sequestration using an industrial-scale airlift PBR at International Power Hazelwood, Gippsland, Victoria, Australia, are 178.9 ± 30 mg L−1 day−1 and 89.15 ± 20 mg ‘C’ L−1 day−1, respectively. This study clearly indicates the potential of growing Tetraselmis on untreated flue gas and using recycled medium for the purpose of biofuel and CO2 bioremediation.
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Tetraselmis suecica culture for CO_2 bioremediation of untreated flue gas from a Coal-Fired Power Station
Journal of Applied Phycology, 2016Co-Authors: Navid R. MoheimaniAbstract:The accumulation of atmospheric CO_2, primarily due to combustion of fossil fuels, has been implicated in potential global climate change. The high rate of CO_2 bioremediation by microalgae has emerged as a favourable method for reducing Coal-Fired Power plant emissions. However, Coal-Fired Power Station flue gas contains other chemicals such as SO_x which can inhibit microalgal growth. In the current study, the effect of untreated flue gas as a source of inorganic carbon on the growth of Tetraselmis in a 1000 L industrial-scale split-cylinder internal-loop airlift photobioreactor was examined. The culture medium was recycled after each harvest. Tetraselmis suecica grew very well in this airlift photobioreactor during the 7-month experiment using recycled medium from an electroflocculation harvesting unit. Increased medium SO_4 ^2− concentration as high as 870 mg SO_4 ^2− L^−1 due to flue gas addition and media recycling had no negative effect on the overall growth and productivity of this alga. The potential organic biomass productivity and carbon sequestration using an industrial-scale airlift PBR at International Power Hazelwood, Gippsland, Victoria, Australia, are 178.9 ± 30 mg L^−1 day^−1 and 89.15 ± 20 mg ‘C’ L^−1 day^−1, respectively. This study clearly indicates the potential of growing Tetraselmis on untreated flue gas and using recycled medium for the purpose of biofuel and CO_2 bioremediation.
Peter F. Nelson - One of the best experts on this subject based on the ideXlab platform.
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Assessing the contribution of Coal-Fired Power Station emissions to atmospheric concentrations of fine particles in New South Wales
Air quality and climate change, 2018Co-Authors: Hugh Malfroy, Peter F. NelsonAbstract:A recent article in the Sydney Morning Herald (Hannam, 2018) referred to a report commissioned by Environmental Justice Australia and undertaken by Dr Ben Ewald from the University of Newcastle (Ewald, 2018). The referenced report estimates that emissions from Coal-Fired Power Stations are responsible for a significant number of adverse health outcomes in the three Power Station operating regions in NSW and in the Sydney region, including 236 deaths, 206 low-weight birth babies and 303 new onset diabetes cases per year. Figure 1 shows the Power Station regions are about 80 to 150 km from central Sydney.
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Speciation of mercury in Coal-Fired Power Station flue gas
Energy & Fuels, 2010Co-Authors: Pushan Shah, Vladimir Strezov, Peter F. NelsonAbstract:Mercury is a potentially toxic trace metal. Mercury exists naturally in coal in very low concentrations, having been incorporated during the coalification process. Consequently, Coal-Fired Power Stations are a major anthropogenic source of mercury because of the large quantity of coal used for electricity generation. In the environment, mercury transforms into methylmercury, a potential neurotoxin, bioaccumulates in aquatic biota, and subsequently, enters the food chain. The subsequent environmental fate and ability to capture mercury prior to emission are dependent upon its different physicochemical forms and oxidation states, known as speciation. In this work, speciation of mercury was conducted at five different coal Power Stations across Australia (one in New South Wales, three in Western Australia, and one in Queensland) by the Ontario Hydro sampling and analysis method. The total Hg concentrations in the emissions of these plants were found to be in the range of 1.9−5.6 μg Nm−3. Particle-bound mercu...
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Mercury wet deposition and Coal-Fired Power Station contributions: an Australian study
Fuel Processing Technology, 2009Co-Authors: Upma Dutt, Peter F. Nelson, Anthony Morrison, Vladimir StrezovAbstract:Regions that have large Coal-Fired Power Station regions may be prone to elevated mercury (Hg) deposition fluxes. Total mercury (THg) in daily rainfall samples at a near-field sampling site (Hunter Valley) and a far-field Station (Sydney) has been monitored in this study employing ultra-clean sampling techniques and Cold Vapour Atomic Fluorescence Spectrometry (CVAFS) analysis. Measurements of THg range from 0.9 to 16.5 and from 1.2 to 18.9 ng/L for the far-field and near-field sites respectively. Average daily THg wet deposition fluxes were 49.9 and 79.8 ng/m 2 for the far and near-field sites respectively. A two-sample t-test reveals the near-field site to have higher rainfall mercury (significant at the 95% level) and deposition fluxes. At the far-field site, lower Hg deposition occurs during the cooler months, while the Hunter Valley site has higher winter deposition. It is believed that the higher winter values near-field may be due to the combined impact of prevailing wind direction and high pollutant build up brought on by lower mixing height. Based on this study, the first in the Southern Hemisphere, we conclude that rainfall THg concentrations and Hg wet deposition fluxes at the two sites are comparable to rural sites in North America.
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Speciation of As, Cr, Se and Hg under coal fired Power Station conditions
Fuel, 2008Co-Authors: Pushan Shah, Vladimir Strezov, Kathryn Prince, Peter F. NelsonAbstract:Coal combustion from Power Stations is an important anthropogenic contributor of toxic trace elements to the environment. Some trace elements may be emitted in range of valencies, often with varying toxicity and bioavailability. Hence, determination of trace element speciation in coals and their combustion products is important for conducting comprehensive risk assessments of the emissions from Coal-Fired Power Stations. This study focuses on speciation of selected trace elements, As, Cr, and Se, in coal combustion products and Hg in flue gas, which were sampled at one Australian Power Station. Different analytical methods such as secondary ion mass spectrometry (SIMS), ion chromatography-inductively coupled plasma mass spectrometry (IC-ICPMS) and X-ray absorption near edge structure spectrometry (XANES) were used to determine trace element speciation in coal and ash samples. Results showed that As, Cr and Se are all present in a range of valency states in coal. Concentrations of As and Se in the bottom ash as well as the more toxic hexavalent chromium were less than the detection limits. The more toxic As3+ form in fly ash was at 10% of the total arsenic, while selenium was mainly found in Se4+ form. Hexavalent chromium (Cr6+) in fly ash was 2.7% of the total fly ash chromium. Mercury speciation in flue gas was determined using the Ontario Hydro sampling train and analysis technique. Approximately 58% of the total mercury in flue gas was released in the elemental form (Hg0), which, among all mercury species, has the highest residence time in the environment due to lower solubility. This work summarises the performance of the selected analytical techniques for speciation of trace elements.11 page(s
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Speciation of As, Cr, Se and Hg under coal fired Power Station conditions
Fuel, 2007Co-Authors: Pushan Shah, Vladimir Strezov, Kathryn Prince, Peter F. NelsonAbstract:Abstract Coal combustion from Power Stations is an important anthropogenic contributor of toxic trace elements to the environment. Some trace elements may be emitted in range of valencies, often with varying toxicity and bioavailability. Hence, determination of trace element speciation in coals and their combustion products is important for conducting comprehensive risk assessments of the emissions from Coal-Fired Power Stations. This study focuses on speciation of selected trace elements, As, Cr, and Se, in coal combustion products and Hg in flue gas, which were sampled at one Australian Power Station. Different analytical methods such as secondary ion mass spectrometry (SIMS), ion chromatography-inductively coupled plasma mass spectrometry (IC-ICPMS) and X-ray absorption near edge structure spectrometry (XANES) were used to determine trace element speciation in coal and ash samples. Results showed that As, Cr and Se are all present in a range of valency states in coal. Concentrations of As and Se in the bottom ash as well as the more toxic hexavalent chromium were less than the detection limits. The more toxic As 3+ form in fly ash was at 10% of the total arsenic, while selenium was mainly found in Se 4+ form. Hexavalent chromium (Cr 6+ ) in fly ash was 2.7% of the total fly ash chromium. Mercury speciation in flue gas was determined using the Ontario Hydro sampling train and analysis technique. Approximately 58% of the total mercury in flue gas was released in the elemental form (Hg 0 ), which, among all mercury species, has the highest residence time in the environment due to lower solubility. This work summarises the performance of the selected analytical techniques for speciation of trace elements.
Vladimir Strezov - One of the best experts on this subject based on the ideXlab platform.
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Speciation of mercury in Coal-Fired Power Station flue gas
Energy & Fuels, 2010Co-Authors: Pushan Shah, Vladimir Strezov, Peter F. NelsonAbstract:Mercury is a potentially toxic trace metal. Mercury exists naturally in coal in very low concentrations, having been incorporated during the coalification process. Consequently, Coal-Fired Power Stations are a major anthropogenic source of mercury because of the large quantity of coal used for electricity generation. In the environment, mercury transforms into methylmercury, a potential neurotoxin, bioaccumulates in aquatic biota, and subsequently, enters the food chain. The subsequent environmental fate and ability to capture mercury prior to emission are dependent upon its different physicochemical forms and oxidation states, known as speciation. In this work, speciation of mercury was conducted at five different coal Power Stations across Australia (one in New South Wales, three in Western Australia, and one in Queensland) by the Ontario Hydro sampling and analysis method. The total Hg concentrations in the emissions of these plants were found to be in the range of 1.9−5.6 μg Nm−3. Particle-bound mercu...
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Mercury wet deposition and Coal-Fired Power Station contributions: an Australian study
Fuel Processing Technology, 2009Co-Authors: Upma Dutt, Peter F. Nelson, Anthony Morrison, Vladimir StrezovAbstract:Regions that have large Coal-Fired Power Station regions may be prone to elevated mercury (Hg) deposition fluxes. Total mercury (THg) in daily rainfall samples at a near-field sampling site (Hunter Valley) and a far-field Station (Sydney) has been monitored in this study employing ultra-clean sampling techniques and Cold Vapour Atomic Fluorescence Spectrometry (CVAFS) analysis. Measurements of THg range from 0.9 to 16.5 and from 1.2 to 18.9 ng/L for the far-field and near-field sites respectively. Average daily THg wet deposition fluxes were 49.9 and 79.8 ng/m 2 for the far and near-field sites respectively. A two-sample t-test reveals the near-field site to have higher rainfall mercury (significant at the 95% level) and deposition fluxes. At the far-field site, lower Hg deposition occurs during the cooler months, while the Hunter Valley site has higher winter deposition. It is believed that the higher winter values near-field may be due to the combined impact of prevailing wind direction and high pollutant build up brought on by lower mixing height. Based on this study, the first in the Southern Hemisphere, we conclude that rainfall THg concentrations and Hg wet deposition fluxes at the two sites are comparable to rural sites in North America.
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Speciation of As, Cr, Se and Hg under coal fired Power Station conditions
Fuel, 2008Co-Authors: Pushan Shah, Vladimir Strezov, Kathryn Prince, Peter F. NelsonAbstract:Coal combustion from Power Stations is an important anthropogenic contributor of toxic trace elements to the environment. Some trace elements may be emitted in range of valencies, often with varying toxicity and bioavailability. Hence, determination of trace element speciation in coals and their combustion products is important for conducting comprehensive risk assessments of the emissions from Coal-Fired Power Stations. This study focuses on speciation of selected trace elements, As, Cr, and Se, in coal combustion products and Hg in flue gas, which were sampled at one Australian Power Station. Different analytical methods such as secondary ion mass spectrometry (SIMS), ion chromatography-inductively coupled plasma mass spectrometry (IC-ICPMS) and X-ray absorption near edge structure spectrometry (XANES) were used to determine trace element speciation in coal and ash samples. Results showed that As, Cr and Se are all present in a range of valency states in coal. Concentrations of As and Se in the bottom ash as well as the more toxic hexavalent chromium were less than the detection limits. The more toxic As3+ form in fly ash was at 10% of the total arsenic, while selenium was mainly found in Se4+ form. Hexavalent chromium (Cr6+) in fly ash was 2.7% of the total fly ash chromium. Mercury speciation in flue gas was determined using the Ontario Hydro sampling train and analysis technique. Approximately 58% of the total mercury in flue gas was released in the elemental form (Hg0), which, among all mercury species, has the highest residence time in the environment due to lower solubility. This work summarises the performance of the selected analytical techniques for speciation of trace elements.11 page(s
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Speciation of As, Cr, Se and Hg under coal fired Power Station conditions
Fuel, 2007Co-Authors: Pushan Shah, Vladimir Strezov, Kathryn Prince, Peter F. NelsonAbstract:Abstract Coal combustion from Power Stations is an important anthropogenic contributor of toxic trace elements to the environment. Some trace elements may be emitted in range of valencies, often with varying toxicity and bioavailability. Hence, determination of trace element speciation in coals and their combustion products is important for conducting comprehensive risk assessments of the emissions from Coal-Fired Power Stations. This study focuses on speciation of selected trace elements, As, Cr, and Se, in coal combustion products and Hg in flue gas, which were sampled at one Australian Power Station. Different analytical methods such as secondary ion mass spectrometry (SIMS), ion chromatography-inductively coupled plasma mass spectrometry (IC-ICPMS) and X-ray absorption near edge structure spectrometry (XANES) were used to determine trace element speciation in coal and ash samples. Results showed that As, Cr and Se are all present in a range of valency states in coal. Concentrations of As and Se in the bottom ash as well as the more toxic hexavalent chromium were less than the detection limits. The more toxic As 3+ form in fly ash was at 10% of the total arsenic, while selenium was mainly found in Se 4+ form. Hexavalent chromium (Cr 6+ ) in fly ash was 2.7% of the total fly ash chromium. Mercury speciation in flue gas was determined using the Ontario Hydro sampling train and analysis technique. Approximately 58% of the total mercury in flue gas was released in the elemental form (Hg 0 ), which, among all mercury species, has the highest residence time in the environment due to lower solubility. This work summarises the performance of the selected analytical techniques for speciation of trace elements.
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Trace element speciation under coal fired Power Station conditions
2007Co-Authors: Pushan Shah, Vladimir Strezov, Peter F. NelsonAbstract:Coal combustion from Power Stations is one of the largest contributors of potentially toxic trace elements to the environment. Some trace elements may be released in range of valencies, often with varying toxicity and bioavailability. Hence, determination of trace element speciation in coals and their combustion products is important for conducting comprehensive risk assessments of the emissions from Coal-Fired Power Stations. This study focuses on speciation of selected trace elements, As, Cr, and Se, in coal combustion products and Hg in flue gas, which were sampled at one Australian Power Station. Results showed that As, Cr and Se are all present in a range of valency states in coal. Concentrations of As and Se in the bottom ash as well as the more toxic hexavalent chromium were less than the detection limits. Fly ash contained the more toxic As3+ form at 10% of total arsenic, while selenium was mainly found in Se4+ form. Hexavalent chromium (Cr6+) in fly ash was 2.7 % of the total fly ash chromium. Mercury speciation in flue gas was determined using the Ontario Hydro sampling train and analysis technique. Approximately 58% of the total mercury in flue gas was released in the elemental form (Hg0), which has the highest residence time in the environment among all mercury species.
Pushan Shah - One of the best experts on this subject based on the ideXlab platform.
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Speciation of mercury in Coal-Fired Power Station flue gas
Energy & Fuels, 2010Co-Authors: Pushan Shah, Vladimir Strezov, Peter F. NelsonAbstract:Mercury is a potentially toxic trace metal. Mercury exists naturally in coal in very low concentrations, having been incorporated during the coalification process. Consequently, Coal-Fired Power Stations are a major anthropogenic source of mercury because of the large quantity of coal used for electricity generation. In the environment, mercury transforms into methylmercury, a potential neurotoxin, bioaccumulates in aquatic biota, and subsequently, enters the food chain. The subsequent environmental fate and ability to capture mercury prior to emission are dependent upon its different physicochemical forms and oxidation states, known as speciation. In this work, speciation of mercury was conducted at five different coal Power Stations across Australia (one in New South Wales, three in Western Australia, and one in Queensland) by the Ontario Hydro sampling and analysis method. The total Hg concentrations in the emissions of these plants were found to be in the range of 1.9−5.6 μg Nm−3. Particle-bound mercu...
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Speciation of As, Cr, Se and Hg under coal fired Power Station conditions
Fuel, 2008Co-Authors: Pushan Shah, Vladimir Strezov, Kathryn Prince, Peter F. NelsonAbstract:Coal combustion from Power Stations is an important anthropogenic contributor of toxic trace elements to the environment. Some trace elements may be emitted in range of valencies, often with varying toxicity and bioavailability. Hence, determination of trace element speciation in coals and their combustion products is important for conducting comprehensive risk assessments of the emissions from Coal-Fired Power Stations. This study focuses on speciation of selected trace elements, As, Cr, and Se, in coal combustion products and Hg in flue gas, which were sampled at one Australian Power Station. Different analytical methods such as secondary ion mass spectrometry (SIMS), ion chromatography-inductively coupled plasma mass spectrometry (IC-ICPMS) and X-ray absorption near edge structure spectrometry (XANES) were used to determine trace element speciation in coal and ash samples. Results showed that As, Cr and Se are all present in a range of valency states in coal. Concentrations of As and Se in the bottom ash as well as the more toxic hexavalent chromium were less than the detection limits. The more toxic As3+ form in fly ash was at 10% of the total arsenic, while selenium was mainly found in Se4+ form. Hexavalent chromium (Cr6+) in fly ash was 2.7% of the total fly ash chromium. Mercury speciation in flue gas was determined using the Ontario Hydro sampling train and analysis technique. Approximately 58% of the total mercury in flue gas was released in the elemental form (Hg0), which, among all mercury species, has the highest residence time in the environment due to lower solubility. This work summarises the performance of the selected analytical techniques for speciation of trace elements.11 page(s
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Speciation of As, Cr, Se and Hg under coal fired Power Station conditions
Fuel, 2007Co-Authors: Pushan Shah, Vladimir Strezov, Kathryn Prince, Peter F. NelsonAbstract:Abstract Coal combustion from Power Stations is an important anthropogenic contributor of toxic trace elements to the environment. Some trace elements may be emitted in range of valencies, often with varying toxicity and bioavailability. Hence, determination of trace element speciation in coals and their combustion products is important for conducting comprehensive risk assessments of the emissions from Coal-Fired Power Stations. This study focuses on speciation of selected trace elements, As, Cr, and Se, in coal combustion products and Hg in flue gas, which were sampled at one Australian Power Station. Different analytical methods such as secondary ion mass spectrometry (SIMS), ion chromatography-inductively coupled plasma mass spectrometry (IC-ICPMS) and X-ray absorption near edge structure spectrometry (XANES) were used to determine trace element speciation in coal and ash samples. Results showed that As, Cr and Se are all present in a range of valency states in coal. Concentrations of As and Se in the bottom ash as well as the more toxic hexavalent chromium were less than the detection limits. The more toxic As 3+ form in fly ash was at 10% of the total arsenic, while selenium was mainly found in Se 4+ form. Hexavalent chromium (Cr 6+ ) in fly ash was 2.7% of the total fly ash chromium. Mercury speciation in flue gas was determined using the Ontario Hydro sampling train and analysis technique. Approximately 58% of the total mercury in flue gas was released in the elemental form (Hg 0 ), which, among all mercury species, has the highest residence time in the environment due to lower solubility. This work summarises the performance of the selected analytical techniques for speciation of trace elements.
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Trace element speciation under coal fired Power Station conditions
2007Co-Authors: Pushan Shah, Vladimir Strezov, Peter F. NelsonAbstract:Coal combustion from Power Stations is one of the largest contributors of potentially toxic trace elements to the environment. Some trace elements may be released in range of valencies, often with varying toxicity and bioavailability. Hence, determination of trace element speciation in coals and their combustion products is important for conducting comprehensive risk assessments of the emissions from Coal-Fired Power Stations. This study focuses on speciation of selected trace elements, As, Cr, and Se, in coal combustion products and Hg in flue gas, which were sampled at one Australian Power Station. Results showed that As, Cr and Se are all present in a range of valency states in coal. Concentrations of As and Se in the bottom ash as well as the more toxic hexavalent chromium were less than the detection limits. Fly ash contained the more toxic As3+ form at 10% of total arsenic, while selenium was mainly found in Se4+ form. Hexavalent chromium (Cr6+) in fly ash was 2.7 % of the total fly ash chromium. Mercury speciation in flue gas was determined using the Ontario Hydro sampling train and analysis technique. Approximately 58% of the total mercury in flue gas was released in the elemental form (Hg0), which has the highest residence time in the environment among all mercury species.
Linhan Ge - One of the best experts on this subject based on the ideXlab platform.
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experiment and simulation on the pyrite removal from the recirculating load of pulverizer with a dilute phase gas solid fluidized bed
International journal of mining science and technology, 2013Co-Authors: Shuai Wang, Jingfeng He, Yaqun He, Linhan GeAbstract:Abstract In order to reduce the energy consumption and subsequent air pollution of Coal-Fired Power Station, based on the analysis to size and density distribution of particles from the recirculating load of the classifier of pulverizer, the separation experiment on sampling material from Power plant with a dilute phase fluidized bed to remove pyrite and other minerals and numerical simulation on the separation process were done. The results show that the minimum fluidization velocity is 1.62 cm/s. Pyrite and other minerals in the material are separated. Ash of the upper and bottom layer material account for 33.34% and 73.42% respectively and sulfur content occupy 1.12% and 8.96% respectively. Scanning electron microscopy and spectroscopy tests show that sulfur in the bottom material exist in the form of pyrite. Numerical simulation on the flow field form of the dilute phase separation bed with gas–solid two phase and particle motion verifies the experimental results.
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Experiment and simulation on the pyrite removal from the recirculating load of pulverizer with a dilute phase gas–solid fluidized bed
International journal of mining science and technology, 2013Co-Authors: Shuai Wang, Jingfeng He, Yaqun He, Linhan GeAbstract:Abstract In order to reduce the energy consumption and subsequent air pollution of Coal-Fired Power Station, based on the analysis to size and density distribution of particles from the recirculating load of the classifier of pulverizer, the separation experiment on sampling material from Power plant with a dilute phase fluidized bed to remove pyrite and other minerals and numerical simulation on the separation process were done. The results show that the minimum fluidization velocity is 1.62 cm/s. Pyrite and other minerals in the material are separated. Ash of the upper and bottom layer material account for 33.34% and 73.42% respectively and sulfur content occupy 1.12% and 8.96% respectively. Scanning electron microscopy and spectroscopy tests show that sulfur in the bottom material exist in the form of pyrite. Numerical simulation on the flow field form of the dilute phase separation bed with gas–solid two phase and particle motion verifies the experimental results.