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Coal oxidation and calcium loading on Pittsburgh No. 8 coal
Mining, Metallurgy & Exploration, 1995Pittsburgh No. 8 coal, cleaned by conventional froth flotation, was oxidized in a 2-L Parr stirred bench-top autoclave. Autoclave tests were carried out for up to 5 hrs under the following conditions: 150 to 225 °C, 60 to 500 psi O2 and 15 to 60 g of coal per 600 mL of distilled water.
E. H. Cho, Q. Luo
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The Oxidation Coal Effect Over a Colombian Coal Structure
International Journal of Coal Preparation and Utilization, 2013Bituminous coal samples from La Jagua Colombia were oxidized in air at 150 and 200°C during 6, 12, 18, and 24 hours. Fourier transformed infrarred (FTIR) thermogravimetry and ultimate analysis showed that the oxidation increased oxygenated groups and decreased aliphatic and aromatic structures of coal.
Nayibe Guerrero +2 more
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The kinetics of coal oxidation
Thermochimica Acta, 1975Abstract Seven coals from across Canada were oxidized, and a kinetic analysis made from the data obtained. It was established that the equation 1 , is a valid rate of sorption of oxygen in the temperature range 110 to 170°C.
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Pyrolysis of coal and iron oxides mixtures. 1. Influence of iron oxides on the pyrolysis of coal
Fuel, 1980Abstract The influence of iron oxide additions on coal pyrolysis has been studied by thermogravimetry and the analysis of the evolved gases. Liquid yields and tar composition were studied by complementary experiments on a larger scale. The presence of iron oxides reduces the primary-devolatilization rate of coal, between 300 and 600 °C.
Cypres, René, Soudan, Claire
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1985
Three coals were oxidized in a fluidized bed, using air at temperatures from 175°C to 280°C and total pressures from 126 kPa. to 274 kPa., for periods of up to 24 hours. An infra-red analyzer was used to measure concentrations of carbon oxide gases in the fluidizing stream. Both CO and CO2 rates declined with time and increased with total pressure. The
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Three coals were oxidized in a fluidized bed, using air at temperatures from 175°C to 280°C and total pressures from 126 kPa. to 274 kPa., for periods of up to 24 hours. An infra-red analyzer was used to measure concentrations of carbon oxide gases in the fluidizing stream. Both CO and CO2 rates declined with time and increased with total pressure. The
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Oxidative Degradation Studies of Coal and Solvent-Refined Coal
1978Aqueous sodium dichromate has been found to be a selective oxidant and numerous polyaromatic units, which resulted from the oxidation of a bituminous coal, have been reported. These products are believed to be indigenous to the coal. The effects of other oxidizing agents have been explored.
RYOICHI HAYATSU +4 more
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Some aspects of the kinetics of oxidation of coal I. The correlation of coal oxidation kinetics
Journal of Applied Chemistry, 1958AbstractThe results of the oxidation of an Australian coal have been successfully correlated by the Elovitch equation: The relationship between the parameters A and B of this equation and the mass of coal used in the experiment leads to the over‐all kinetic equation:
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Oxidation paths of a coking coal and comparison of its oxidized product with a non-caking coal
Fuel, 1997A coking coal was rendered non-caking by air oxidation at 125°C. The oxidation process was followed by free swelling index, dilatometry, FT-i.r and e.s.r. It was found that the oxidation could be divided into two steps. The main feature observed in the first step was loss of coking properties.
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