College of Mining Engineering, Taiyuan University of Technology
Washing and Processing Department, Shanxi Coking Coal Group

低阶煤表面含有较多含氧基团,可浮性差,采用传统煤油捕收剂不仅药剂消耗大,而且分选效果差。复配捕收剂可以选择性地作用于矿物表面,从而提升浮选效果。以内蒙古色连二矿选煤厂低阶煤为研究对象,考察了传统捕收剂煤油的作用效果,并在此基础上引入含氧有机药剂油酸和Span80与其复配,考察复配药剂对低阶煤浮选的强化作用,并对其作用机理进行分析。结果表明:煤油-油酸和煤油-Span80复配药剂对实验煤样浮选均有促进作用。捕收剂用量为4000g/t,起泡剂用量为800g/t时,煤油-Span80复配药剂对应的精煤产率为83.17%,精煤灰分为11.78%,尾煤灰分为69.15%,可燃体回收率达到93.48%,浮选完善指标为42.18%。与煤油和煤油-油酸复配药剂相比,煤油-Span80复配药剂可显著提升尾煤灰分和可燃体回收率,达到了较为理想的分选效果。机理研究结果显示,油酸和Span80与煤油复配,可显著降低药剂在矿浆中的分散粒径,提高其与颗粒的接触概率;同时,油酸和Span80与煤作用,掩蔽了煤样表面的亲水基团,改善了煤样疏水性,使其更易在煤粒表面铺展。模拟计算发现油酸和Span80药剂的前线轨道能隙小于正十二烷(煤油)的前线轨道能隙,煤油-油酸和煤油-Span80复配药剂与煤表面的相互作用能大于正十二烷(煤油)与煤表面的相互作用能,表明复配药剂更具活性,更容易与煤表面发生吸附。

The surface of low-rank coal contains many oxygen-containing groups and the floatability is poor. Using traditional kerosene collectors not only consumes more agents, but al-so has poor separation effects. The compound collectors can selectively act on the mineral sur-faces to improve the flotation effect. The influences of the traditional kerosene collector on the flotation of low-rank coal from a coal processing plant of Selian No.2 mine in Inner Mongolia were investigated. The oxygen-containing organic chemicals oleic acid and Span80 were separately compounded with kerosene to investigate the enhanced effect of the compound collectors on the flotation of low-rank coal, and the mechanisms were analyzed. The results show that the mixture of kerosene-oleic acid and kerosene-Span80 have a promoting effect on the flotation of the experi-mental coal samples. When the dosage of the kerosene-Span80 compound agent is 4 000 g/t and the dosage of the foaming agent is 800 g/t, the yield of fine coal is 83.17%, the ash content of fine coal is 11.78%, the ash content of tailings coal is 69.15%, the recovery of combustible ma-terials reaches 93.48%, and the flotation perfection index is 42.18%. Compared with kerosene and kerosene-oleic acid compound agents, kerosene-Span80 compound agents can significantly im-prove the ash content of tailings coal and recovery of combustible materials, achieving a relatively ideal separation effect. The mechanism analysis shows that the compounding of oleic acid and Span80 with kerosene can significantly reduce the dispersed particle size of the agent in the slurry and improve the probability of its contact with the particles. At the same time, oleic acid and Span80 mask the hydrophilic groups on the surface of coal samples, and improve the hydropho-bicity of the samples, making it easier for the agent to spread on the surface of coal particles. The simulation found that the frontline orbital energy gap of oleic acid and Span80 is smaller than that of n-dodecane (kerosene), and the binding energy of kerosene-oleic acid and kerosene-Span80 on the coal surface is greater than that of n-dodecane (kerosene), indicating that the compound agents are more active and easier to adsorb on the coal surface.

国家自然科学基金青年基金项目(22208235).

刘凯歌,李钰炳,李志红,等.油酸和Span80协同煤油对低阶煤的浮选强化及分子模拟计算[J].煤炭转化,2024,47(2):12-21

LIU Kaige,LI Yubing,LI Zhihong,et al.Flotation enhancement and molecular simulation of low rank coal by compound of oleic acid and Span80 with kerosene[J].Coal Conversion,2024,47(2):12-21