Distribution of phosphorus in Chinese coals

The phosphorus content in Chinese coals was studied based on 1117 coal samples from Chinese Coal Resource Database and new sampling coals. The results show that the weighted mean content of phosphorus in Chinese coals is 224×10^-6, about 90% of the phosphorus content of Chinese coal below 500×10^-6 and belong to lower or super lower content, and the phosphorus content in southern China is higher than in northern China. The distribution of phosphorus in Chinese coal from different coal-accumulated area, different geological ages, and different classes of coals was discussed. The results show that the phosphorus content of coal in Triassic period from southern China (Jiangxi, Hunan, Sichuan, Yunan and Fujian provinces) is the highest. The relativities between the phosphorus content and other factors were analyzed. The results show that the phosphorus content of Chinese coal has no significant correlation with sulfur, forms of sulfur, ash and ash component, the correlation between phosphorus and strontium, fluorine are obviously higher than other elements in Chinese coals.