Content characteristics and occurrence status of fluorine in some imported coals
YANG Changqing
KANG Fei
BAI Bing
ZHANG Shuangshuang
XU Caichun
XU Zhibin
Abstract：In order to strengthen the management of imported high fluoride coals and evaluate the environment immigration risk of fluorine element in imported coals,the concentrations of fluorine element in the imported 225 batch coals of Tangshan port were determined using high temperature burning hydrolysis-ion selective electrode method.The overall content level of fluorine were described by robust statistics.The quality were evaluated by the national coal classification standard and enrichment ratio.The relevant analysis were used to study the occurrence status characteristics of fluorine.The results showed that the fluorine in coals of Jingtanggang port were (137±24) mg/kg.According to Chinese coal industry standards for quality grading evaluation,68％ of Korea coal and 62％ of Canada coals were medium fluorine coal.The arithmetic average of fluorine of these two coals were higher than those of Chinese coal and the world's coal.So their environment immigration risk should be noticed.Fluorine content in Korea coals was moderate positive correlation with the ash,total sulfur and it was weak positive correlation with the phosphorus.The correlation analysis of ash,sulfur,phosphorus and fluorine content in Korea coal showed that the occurrence modes of fluorine were mainly inorganic sulfur bound (sulfides and sulfates) and clay minerals form.A small part of fluorine in Korea coals might be present in phosphate minerals and organic sulfur in bound.The correlation of ash,total sulfur and fluorine in Australian coals was not significant,and the correlation phosphorus and fluorine was low.The correlation analysis of ash,sulfur,phosphorus and fluorine content in Australian coals showed that the occurrence modes of fluorine were complex,it might be phosphate bound partly and occurred in the fluorapatite and aluminum calcium phosphate rock.The correlation of ash,total sulfur and fluorine in Canada coals was not significant,and the correlation coefficient of phosphorus content was 0.763,significance level was 0.01.It indicated that fluorine and phosphorus had a strong associated relationship,and it inferred that fluorine was mainly in the phosphorus bound,occurred in the fluorapatite and aluminum calcium phosphorus rock.
Keywords：imported coalfluorinecontent characteristicsoccurrence status
Publication Date：2017-01-01