Concentration of fluorine in typical coals from China have been determined by half-fusion/fluoride-ion selective electrode method (FISE) The distribution regularities of fluorine in coals have been obtained The correl...Concentration of fluorine in typical coals from China have been determined by half-fusion/fluoride-ion selective electrode method (FISE) The distribution regularities of fluorine in coals have been obtained The correlation between fluorine and ash, fluorine and phosphorus and their probable mode of occurrence in coals have been quantitatively analyzed and discussed respectively It was observed that fluorine concentrations in Chinese coals approximately follow logarithmic statistics normal distribution The fluorine concentration ranges between 17 and 3088 μg/g and mean value is close to 200 μg/g The fluorine concentration increases with the ash content of the sample and the coal rank Fluorine is mainly present in mineral species, but fluoraptite is not the principal hose for fluorine in the coals studied The results will be of significance for combustion, conversion and pollution control of fluorine during coal展开更多
Based on the analysis of 15 raw coals and washed coals collected from Southwestern, the washing rate of arsenic, sulfur and ash from raw coals was studied. The average washing rate of arsenic in raw coal is 38%. Arsen...Based on the analysis of 15 raw coals and washed coals collected from Southwestern, the washing rate of arsenic, sulfur and ash from raw coals was studied. The average washing rate of arsenic in raw coal is 38%. Arsenic of raw coals is mainly associated with pyrite and sulfide. However, arsenic of some raw coals is mainly or wholly associated with organic matter and mineral enwrapped by organic matter. It is difficult to remove such part of arsenic and it will enrich in the washed coals. The results show that there is a little relationship between occurrence mode of arsenic associated with organic sulfur and rank of coal, but it is complicated with age of coal-bearing strata.展开更多
基金国家自然科学基金! (No :598760 36)浙江省自然科学基金! (No :5960 97)国家重点基础研究发展规划项目!(G1 9990 2 2 2 1 1 )资助
文摘Concentration of fluorine in typical coals from China have been determined by half-fusion/fluoride-ion selective electrode method (FISE) The distribution regularities of fluorine in coals have been obtained The correlation between fluorine and ash, fluorine and phosphorus and their probable mode of occurrence in coals have been quantitatively analyzed and discussed respectively It was observed that fluorine concentrations in Chinese coals approximately follow logarithmic statistics normal distribution The fluorine concentration ranges between 17 and 3088 μg/g and mean value is close to 200 μg/g The fluorine concentration increases with the ash content of the sample and the coal rank Fluorine is mainly present in mineral species, but fluoraptite is not the principal hose for fluorine in the coals studied The results will be of significance for combustion, conversion and pollution control of fluorine during coal
文摘Based on the analysis of 15 raw coals and washed coals collected from Southwestern, the washing rate of arsenic, sulfur and ash from raw coals was studied. The average washing rate of arsenic in raw coal is 38%. Arsenic of raw coals is mainly associated with pyrite and sulfide. However, arsenic of some raw coals is mainly or wholly associated with organic matter and mineral enwrapped by organic matter. It is difficult to remove such part of arsenic and it will enrich in the washed coals. The results show that there is a little relationship between occurrence mode of arsenic associated with organic sulfur and rank of coal, but it is complicated with age of coal-bearing strata.
