Abstract
Determination of organic oxygen in coal is specially important for advanced utilization of coal. However, the direct and indirect analyses conventionally used are not always reliable presumablly because of the thermal decompofition of ash in coal in the processes of the analyses. The present investigation has been carried out to establish an accurate determination of organic oxygen in coal by using a low temperature asher which has recently been developed.A IPC model 1101 plasma asher was used for this pwrpose and the fast neutron activation analysis and the thermal decomposition method were used for the determination of oxygen content. First, several clay minerals and their mixtures with pure carbon wese treated in a stream of oxygen plasma in a total high frequency power range between 200 and 900 watt for six sample chambers. The reaction temperatures were deduced by checking melting point of pure substances in amples under the similai reaction conditions.From these results and also results on the differential themal and the products, it was conclusively found that the oxygen flow rate of 600 ml/min and the high frequency power of 600 watt were most snitable for complete oxidation of organic matter without prodneing the thermal decomposition of ash in coal and organic oxygen content of coal was accurately determined as the difference beween the total oxygen content of coal and the oxygen content of ash in the coal.
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