宁夏某地煤中砷的赋存状态及可脱除性研究  

Study on occurrence and removability of arsenic in coal from a locality in Ningxia

作　　者：刘铖[1] 周长春[1] 丛龙斐 张宁宁[1] 潘金禾 

机构地区：[1]中国矿业大学化工学院,江苏徐州221116

出　　处：《中国科技论文》2016年第15期1757-1761,共5页China Sciencepaper

基　　金：国家重点基础研究发展计划(973计划)资助项目(2014CB238905);国家自然科学基金资助项目(51174205)

摘　　要：根据浮沉试验、逐级化学提取试验、筛分试验、重选脱除试验和浮选脱除试验结果,结合X射线衍射(X-ray diffraction,XRD)、电感耦合等离子体质谱(inductively coupled plasma mass spectrometry,ICP-MS)以及数理统计等分析手段,研究了目标煤样中砷元素的赋存状态,探讨了煤中砷元素与煤组分之间的统计关系以及砷元素的可脱除性。结果表明:该煤样砷有亲硫特性;砷趋于富集在-0.074mm粒级中;砷在该煤样中主要以硫化物结合态存在,占煤中砷总量的43.44%;在分选密度为1.55kg/L时,重选脱除试验表明砷脱除率可达64.70%;浮选也可脱除部分砷,但存在脱除极限,需要通过辅助手段才能进一步脱除煤中的砷元素。Modes of occurrence removability of arsenic, and statistical relationships between arsenic content, ash content, and sul-fur content are discussed for the target coal based on the results of float-sink tests , sequential chemical extraction tests , screening tests,gravity separation experiment, and flotation experiment, combined with the analysis of X-ray diffraction （XRD） , inductively coupled plasma mass spectrometry （ICP-MS） and mathematical statistics. Results indicate that arsenic in coal samples has an affinity to sulfur in coal ; arsenic in coal have a tendency to enrich in - 0. 07 4 mm size fract ion in row coal and most ly occurs in association with sulfur,which is account for 43. 44%; 64. 70% of arsenic can be removed by gravity concentration with the separation density is 1. 55 kg/L ; part of arsenic can be removed by forth flotat ion However, there exists a limit for the removal of arsenic in coal either by gravity separation or by froth flotation Thus assistant methods are needed for further removal of arsenic.

关 键 词：矿物加工工程 砷 煤组分 赋存状态 可脱除性 

分 类 号：TD94[矿业工程—选矿]