Experimental study on enhancing flotation of low-rank coal using mixed reagents
LI Yubing
FAN Chen
QIN Shenhui
HUANG Baolin
LI Zhihong
Abstract：In view of the difficulty in flotation of low-rank coal,experimental study is conducted on the promot-ing effect on flotation of such coal produced by different collectors.Response Surface Methodology(RSE)is used to optimize the experimental design.The experimental design and data analysis are made by using the Design Expert 8.0 software with dosage of collector and frother,and proportioning of agents as influence factors.As indicated by study results,the dosages of collector and forther exert a significant impact on flotation performance;and with a mass percent of compound agent of Span80 at 20％,a dosage of collector at 3 600 g/t and a dosage of frother at 770 g/t,the yield and ash of flotation concentrate,ash of tailing and recovery of com-bustible matters are 83.06％,11.62％,67.99％and 93.12％,respectively,with a noticeably improved flotation ef-fects as compared with the case without the use of compound agent.It is noted through XPS analysis and analys-is of variation of contact angles of the coal sample before and after the compound agent goes into action,the ad-dition of compound agent can lead to reduction of oxygen-containing functional groups on coal surface,in-crease of both contact angle and hydrophobicity and promotion of interaction with kerosene,thus beneficial to improvement of flotation efficiency.
Keywords：low-rank coal flotationmixed collectorresponse surface methodologySpan80oxygen-containing functional group on coal surfacecontact angle
Publication Date：2023-12-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 95-100 )