摘要
通过偏光显微镜和扫描电子显微镜观察,探究了黄铁矿的赋存状态;通过解离度统计和浮沉试验等方法对磨矿过程中黄铁矿的解离特性进行了研究;在以上研究基础上结合浮选试验和浮选产品性质的分析,探究了黄铁矿的赋存特征与解离特性对黄铁矿浮选脱除的影响.研究结果表明:煤中黄铁矿的赋存形式复杂,主要以微细粒草莓状嵌布于煤中,其粒度均在10μm以下.在磨矿过程中黄铁矿的解离度未能有效提高,解离的选择性较差.磨矿有利于降低浮选精煤的硫分,但单纯通过磨矿-浮选难以达到理想的脱硫指标.对于本煤样,在浮选条件下黄铁矿自身的疏水性不足以使其上浮,黄铁矿主要通过与连生的煤一起上浮进入精煤,因此黄铁矿的解离有利于浮选脱硫.然而在磨矿过程中,黄铁矿主要赋存形式的草莓状黄铁矿由于嵌布粒度细、与煤紧密共生难以在磨矿过程中选择性解离出来,这是制约进一步提高浮选脱除黄铁矿效率的主要因素.
Based on polarization microscope and SEM observation, the occurrence of coal-pyrite was investigated, then the liberation of coal-pyrite was studied by mineral liberation degree statistic experiments and sink-float separation experiments, on this basis the implication of occurrence and liberation characteristics on pyrite removal by flotation was studied by flotation experiments and flotation product analysis. The results show that the occurrence state of coal-pyrite in the coal sample is complicated, and the pyrite are mainly present as framboid clusters embedded in coal. Although the locked pyrite liberates from coal partially, however the liberation is not high-efficient, a large amount of pyrite are still locked with coal even though the particles were finely ground. Liberation of pyrite from coal led to the decrease of concentrate sulphur grade, however, desirable desulfuration results can hardly be obtained through grinding-flotation method. As to the investigated coal sample, pyrite can hardly float by its intrinsic floatability, the flotation of pyrite was primarily attributed to the locked floatable coal. Therefore the liberation of pyrite from floatable coal decreased pyrite flotation. The grinding process is characterized with inefficient liberation of embedded fine framboid pyrite which is closely associated with coal, and therefore limited the pyrite removal from coal by flotation.
作者
曹世明
曹亦俊
马子龙
廖寅飞
CAO Shiming;CAO Yijun;MA Zilong;LIAO Yinfei(School of Resources and Environmental Engineering,Shandong University of Technology,Zibo,Shandong 255000,China;National Engineering Research Center of Coal Preparation and Purification,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;Henan Province Industrial Technology Research Institute of Resources and Materials,Zhengzhou University,Zhengzhou,Henan 450001,China)
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2019年第6期1366-1374,共9页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(51574240)
作者简介
通信作者:曹亦俊(1969-),男,江苏省徐州市人,教授,博士生导师,工学博士,从事矿物加工理论、工艺与设备等方面的研究.E-mail:caoyj@cumt.edu.cn,Tel:0516-83591116。
