基于BPMA预测的特低灰煤浮选制备效果  

Effect of flotation preparation of ultra-low ash coal based on BPMA prediction

作　　者：裴伟伟 马晓敏 樊玉萍[1] 董宪姝[1] 李帆 邢慧娟 PEI Weiwei;MA Xiaomin;FAN Yuping;DONG Xianshu;LI Fan;XING Huijuan(School of Mining Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China)

机构地区：[1]太原理工大学矿业工程学院,山西太原030024

出　　处：《中国矿业大学学报》2023年第2期389-396,共8页Journal of China University of Mining & Technology

基　　金：国家基金重点国际(地区)合作研究项目(51820105006);国家自然科学基金面上项目(52074189);国家自然科学基金青年基金项目(520041185);山西省留学回国人员择优资助项目(20210036)。

摘　　要：特低灰煤的制备对于煤炭提质增效与“碳减排”具有重要现实意义.本文通过工业分析、粒度组成、X射线衍射(XRD)及X射线荧光光谱(XRF)考察了长平选煤厂煤泥性质,借助工艺矿物学自动分析仪(BPMA)对脱泥后样品中灰分的嵌布特征及解离效果进行了分析,发现解离前矿样中的灰分主要为内灰,占有率为8.13%,碳质与脉石矿物的连生非常密切,解离后内灰的占有率为4.68%,脉石矿物多以单体形式存在,即特低灰煤的理想灰分为4.68%.利用常规浮选和絮团浮选验证了BPMA预测灰分的可靠性,并采用接触角、Zeta电位分布和扫描电镜(SEM-EDS)分析了细泥罩盖机理和聚合氯化铝(PAC)的作用机理.结果表明:常规浮选制备所得特低灰煤的灰分为5.01%,与理想值最接近,但是可燃体回收率较低,而絮团浮选制备所得特低灰煤的灰分为5.48%,可燃体回收率达86.30%.PAC在浮选试验中的添加增大了样品接触角,使样品疏水性增强,提高了精煤的选择性,同时通过电中和作用使高岭石发生团聚,降低了矿物质在煤表面的罩盖,使产品灰分降低.Preparation of extra-low ash coal is of great practical significance for coal quality and efficiency improvement and carbon emission reduction. In this study,the properties of coal slurry from Changping Coal Preparation Plant were investigated using industrial analysis,particle size composition,X-ray diffraction(XRD) and X-ray fluorescence spectroscopy(XRF). Further,the characteristics of the embedding and dissociation effect of ash on the sample after desliming were analyzed using BGRIMM process mineralogy analyzer(BPMA). The results show that the ash content of ore samples before dissociation is mainly internal ash,accounting for 8.13%,and the carbonaceous and gangue minerals are closely linked. The percentage of inner ash after dissociation is 4.68%,and gangue minerals mostly exist in the form of monomer,that is,the ideal ash content of extra-low ash coal is 4.68%. The reliability of BPMA prediction of ash is verified by conventional and flocculation flotation,and the contact angle,zeta potential distribution and SEM-EDS are used to analyze the characteristics of fine mud cover and polymeric aluminum chloride(PAC). The results show that the ash content of extra-low ash coal prepared by conventional flotation is 5.01%,which is closest to the ideal value,but the recovery of combustible bodies is low. In contrast,the ash content of ultra-low ash coal prepared by flocculation flotation is 5.48% and the recovery rate of combustible is 86.30%. The addition of PAC in the flotation experiments increase the contact angle,enhance the hydrophobicity of the samples,and improve the selectivity of clean coal. In addition,the kaolinite is aggregated through electric neutralization,which reduces the cover of minerals on the coal surface and the ash content of the product.

关 键 词：嵌布特征 解离 絮团浮选 特低灰煤 BPMA 细泥罩盖 

分 类 号：TD94[矿业工程—选矿]