Quality or grade

英文Quality or grade

中文 (征集中)


(1)An informal classification of coal relating to its suitability for use for a particular purpose. (2)Individual measurements such as heat value, fixed carbon, moisture, ash, sulphur, major, minor, and trace elements, coking properties, petrologic properties, and particular organic constituents. The individual quality elements may be aggregated in various ways to classify coal for such special purposes as metallurgical, gas, petrochemical, and blending usages



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