DOI: 10.11799/ce202505013
Experimental study on efficient flotation separation process of difficult-to-float coking coal slime
CHEN Hui
HE Jingyi
ZHANG Rui
LIU Wenli
LI Furen
ZHUO Qiming
LIANG Shihao
TANG Chenjie
ZHANG Zhenghui
WANG Yun
Abstract：In view of the low yield and high ash content of the concentrate using conventional flotation process for slime with very high fine particle content,which failed to meet the quality requirements,a multi-stage flotation process was explored for the Longquan 4#coal slime.The"one roughing,one cleaning"two-stage flotation tests revealed that the entrainment of high-ash fine slime led to elevated ash content in the concentrate.Due to the high-shear flocculation flotation demonstrated a significant improvement in reducing fine slime entrainment,the"high-shear flocculation flotation+one roughing,two cleanings"flotation process combined with a reasonable flotation reagent system was adopted.The mechanisms underlying the improvement in flotation efficiency due to high-shear flocculation were analyzedusing laser particle size analyzer,contact angle measuring instrument,scanning electron microscopy,and calculations of the collision probability between coal particles and oil droplets.The results indicated that using the flotation process of"high-shear flocculation flotation+one roughing,two cleaning",the concentrate ash content of Longquan 4#difficult-to-float coking coal slime can be reduced to 11.73%,the concentrate recovery rate reached approximately 50%,and the tail coal ash content can be increased to 82.57%.Both the concentrate and the tail coal index can meet the requirements of coal preparation plant.
Keywords：difficult-to-float slimeflotation processhigh shearflocmulti-stage flotation
Publication Date：2025-05-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 92-98 )