摘要
为探究煤中镓元素与矿物质在选煤过程中的富集规律,以平朔高灰高硫煤为研究对象,通过筛分、浮沉试验对各粒度级和各密度级分离产品及其煤灰产品进行制备,并且采用化学法、X射线衍射法分别对产品中的镓元素和矿物质进行分析。结果表明,同一试验样品其灰中镓元素的富集程度均远高于试验样品本身,富集比为1.12~11.78,即通过燃烧均达到了富集的效果,尤其小粒度级和小密度级范围内的煤灰中镓元素富集量高,富集比分别为3.36和11.78。此外,试验样品燃烧前后镓元素的富集因子EF都在0.4~0.85的范围内,说明镓元素与煤灰的相关性较大。进一步通过镓元素与矿物质的相关性分析发现,镓元素主要富集在高岭石、勃姆石中,试验样品经过燃烧后发现,镓元素与高岭石的燃烧产物红柱石的相关系数为0.797,说明镓元素在燃烧的过程中从高岭石迁移到了红柱石中。
In order to explore the enrichment characteristics of gallium and minerals in coal preparation process,Pingshuo high ash and high sulfur coal is taken as the research object.The products of different size range of separation and density fraction and their ash products are prepared by size analysis,float-and-sink test.And the minerals and gallium elements in the products are analyzed by chemical method and X-ray diffraction method respectively.The results show that the concentration of gallium in ash of the same test sample is much higher than that of the test sample itself,and the enrichment ratio is 1.12-11.78.The enrichment effect is achieved by combustion,especially in the range of small particle size and small density,the concentration of gallium in coal ash is high,and the enrichment ratio is 3.36 and 11.78 respectively.In addition,the concentration factor EF of gallium in the test samples before and after coal combustion is within the range of 0.4-0.85,which indicates that gallium is highly correlated with ash.Further analysis of the correlation between gallium and minerals shows that gallium is mainly concentrated in kaolinite and boehmite.The correlation coefficient between gallium and andalusite is 0.797,which indicates that gallium migrates from kaolinite to andalusite during combustion.
作者
刘建婧
姚素玲
朱本康
董宪姝
LIU Jianjing;YAO Suling;ZHU Benkang;DONG Xianshu(Colloge of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《中国矿业》
北大核心
2020年第1期150-156,共7页
China Mining Magazine
基金
山西省自然科学基金项目资助(编号：201601D011056)
重点国际(地区)合作研究项目资助(编号：51820105006)
关键词
镓元素
矿物质
相关性
富集规律
gallium
mineral
correlation
enrichment characteristics
