Abstract
To extract and study mineral matter in coal is a major field in coal science. In this study, Low Temperature Ashing (LTA) has been used to extract sulphide minerals from coal. In LTA, most, but not all of, the minerals in coal are unaffected. The disadvantage of this method has been that the actual temperature inside the oxidation chambers could not be measured and ,consequently, the ashing process could not be controlled. For example, in the case of this study, the sulphide minerals usually oxidize and some become lost as SO{sub 2} in the ashing process. When the ashing temperature can be measured and controlled, the ashing process inside the chambers can be controlled. This makes it possible to have the same ashing condition for different coal samples of different ranks and calorific values, so that minerals in coal can be studied without any changes or damage of the minerals in the samples. The temperature inside the chambers was measured with thermographs, which changes colour from silver-white to black when they reach a certain temperature. To control the temperature, the oxygen was diluted with helium gas before entering the LTA. The gases given off, here called the `off-gas`, from the
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Shirazi, A R;
Lindqvist, O
[1]
- Chalmers Univ. of Tech. and Goeteborg Univ. (Sweden). Dept. of Inorganic Chemistry
Citation Formats
Shirazi, A R, and Lindqvist, O.
Very low temperature ashing (VLTA). A method of extracting mineral matter from coal (An improvement of the LTA method).
Sweden: N. p.,
1991.
Web.
Shirazi, A R, & Lindqvist, O.
Very low temperature ashing (VLTA). A method of extracting mineral matter from coal (An improvement of the LTA method).
Sweden.
Shirazi, A R, and Lindqvist, O.
1991.
"Very low temperature ashing (VLTA). A method of extracting mineral matter from coal (An improvement of the LTA method)."
Sweden.
@misc{etde_10141757,
title = {Very low temperature ashing (VLTA). A method of extracting mineral matter from coal (An improvement of the LTA method)}
author = {Shirazi, A R, and Lindqvist, O}
abstractNote = {To extract and study mineral matter in coal is a major field in coal science. In this study, Low Temperature Ashing (LTA) has been used to extract sulphide minerals from coal. In LTA, most, but not all of, the minerals in coal are unaffected. The disadvantage of this method has been that the actual temperature inside the oxidation chambers could not be measured and ,consequently, the ashing process could not be controlled. For example, in the case of this study, the sulphide minerals usually oxidize and some become lost as SO{sub 2} in the ashing process. When the ashing temperature can be measured and controlled, the ashing process inside the chambers can be controlled. This makes it possible to have the same ashing condition for different coal samples of different ranks and calorific values, so that minerals in coal can be studied without any changes or damage of the minerals in the samples. The temperature inside the chambers was measured with thermographs, which changes colour from silver-white to black when they reach a certain temperature. To control the temperature, the oxygen was diluted with helium gas before entering the LTA. The gases given off, here called the `off-gas`, from the LTA were analyzed with a quadrupole mass spectrometer under different experimental conditions. The ashing process was also studied in different atmospheres. In this study the experiments showed that the desirable oxygen/helium ratio is directly proportional to the rank and sulphur content of the coal sample. 17 refs., 32 figs.}
place = {Sweden}
year = {1991}
month = {Dec}
}
title = {Very low temperature ashing (VLTA). A method of extracting mineral matter from coal (An improvement of the LTA method)}
author = {Shirazi, A R, and Lindqvist, O}
abstractNote = {To extract and study mineral matter in coal is a major field in coal science. In this study, Low Temperature Ashing (LTA) has been used to extract sulphide minerals from coal. In LTA, most, but not all of, the minerals in coal are unaffected. The disadvantage of this method has been that the actual temperature inside the oxidation chambers could not be measured and ,consequently, the ashing process could not be controlled. For example, in the case of this study, the sulphide minerals usually oxidize and some become lost as SO{sub 2} in the ashing process. When the ashing temperature can be measured and controlled, the ashing process inside the chambers can be controlled. This makes it possible to have the same ashing condition for different coal samples of different ranks and calorific values, so that minerals in coal can be studied without any changes or damage of the minerals in the samples. The temperature inside the chambers was measured with thermographs, which changes colour from silver-white to black when they reach a certain temperature. To control the temperature, the oxygen was diluted with helium gas before entering the LTA. The gases given off, here called the `off-gas`, from the LTA were analyzed with a quadrupole mass spectrometer under different experimental conditions. The ashing process was also studied in different atmospheres. In this study the experiments showed that the desirable oxygen/helium ratio is directly proportional to the rank and sulphur content of the coal sample. 17 refs., 32 figs.}
place = {Sweden}
year = {1991}
month = {Dec}
}