针对煤气化细渣浮选回收时浮选药剂消耗量大的问题，以陕西榆林某地煤气化细渣为研究对象，通过全粒级浮选、以及对全粒级浮选产品的粒度分析与各粒级浮选完善指标和可燃体回收率的计算，结合 0。5～0。25 mm 与 0。25～0。125 mm 的 SEM、XRD 和 FTIR 结果分析，判断+0。125 mm煤气化细渣不能有效通过浮选分离有机质与无机质，因此提出"预先分级+浮选"联合工艺流程，对-0。125 mm进行浮选分步释放实验，将-0。125 mm粒级浮选后富集的精煤与预先分级的+0。125 mm部分合并作为最终精煤，获得了灰分为 26。38%，产率为 66。42%的精矿。"预先分级+浮选"联合与全粒级浮选工艺流程相比，不但具有工艺流程简单，药剂消耗低，工艺流程调控灵活等优点，而且具有高产率、低灰分的优势，可以更高效地回收利用气化细渣。
Study on flotation behavior and process of coal gasification fine slag
In view of the large consumption of flotation agents during the recycling and utilization of coal gasification fine slag,the coal gasification fine slag in Yulin was used as the research object,through whole grain flotation,and the particle size analysis of whole grain flotation products and the calculation of perfect indicators and combustible gas recovery rate of each particle level flotation product,combining with the SEM,XRD and FTIR results of 0.5～0.25 mm and 0.25～0.125 mm,and it was judged that the organic and inorganic matter in+0.125 mm coal gasification fine slag could not be effectively separated by flotation;so a pre-grading flotation combined process was proposed,and the flotation distribution release experiment was carried out on-0.125 mm fraction,and the refined coal after-0.125 mm flotation was mixed with the pre-graded+0.125 mm fraction as the final refined coal,and a concentrate with an ash of 26.38%and a yield of 66.42%was obtained.Compared with the whole grain flotation process,pre-grading flotation process has the advantages of simple process flow,low chemical consumption,flexible process control,high yield and low ash content,and can recover gasification fine residue more efficiently.
coal-based solid wastegasification fine slagparticle size compositionpre-gradingstep-by-step releasereclamation
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