【摘要】 实验使用磨球直径为8mm的搅拌磨对尾煤进行磨矿,磨矿时间为4min。将磨矿后煤泥经Φ50mm小锥角旋流器进行分级,脱除其中硬度大、灰分高的粗颗粒。结果表明:分级后的底流产率为3.26%(质量分数,下同),灰分为60.46%;尾煤分级后,将Φ50mm旋流器溢流产物进行浮选,浮选实验整体采用一次粗选和二次精选的实验流程进行提质研究;DLVO理论研究表明,能量输入是细泥罩盖污染的重要因素;能量扰动实验结果表明,二次精选有效实现了精煤回收和黏土矿物富集,可燃体回收率最高为21.82%,灰分最低达到9.63%,尾煤灰分最高为87.26%。更多还原

【Abstract】 A stirring mill with 8 mm ball was used to grind the coal,and the grinding time was 4 min in the experiment.The grinded coal slime was classified by 50 mm small cone angle cyclone to remove the coarse particles with high hardness and ash mass fraction.The results show that the underflow rate is 3.26% and the ash mass fraction is 60.46%.After tailings classification,the overflow product of 50 mm cyclone is to be floated.The whole flotation test flow is one roughing stage and two cleaning stages to upgrade the quality of flotation.The DLVO theory study shows that energy input is an important factor affecting the mud cover.After energy disturbance test,the results show that secondary cleaning can effectively actualize the recovery of clean coal and enrichment of clay minerals.The highest recovery rate of combustible matter is 21.82%,the lowest ash mass fraction is 9.63%,and the highest ash mass fraction of tailings is 87.26%.更多还原