目前洗精煤产品的灰分较高，限制了煤炭的使用范围，把煤炭产品的灰分降到1.00%以下，是高效、洁净利用煤炭的重要途径，是洁净煤技术的重要组成部分，能够有效拓宽煤炭产品的使用范围。 为此，通过新技术、新设备和新工艺的研究开发，以太西洗煤厂末煤重介分选入料煤及其分选的低灰精煤为原料，通过搅拌球磨深度解离实验，絮凝剂选择性絮凝—浮选实验，首先进行了实验室磨矿—絮凝—浮选实验，在获取较佳实验条件的基础上，进行工艺流程设计及设备选型加工，搭建实验室连续化分选装置并进行中试化试验。 通过太西煤的超细磨矿解离实验研究，明确了太西煤中矿物质的组成及其嵌布特征，破碎解离方法及工艺技术条件。改造搅拌磨机，在有效磨矿的前提下，解决了磨介和矿浆分离的难题，处理能力达到了150kg/h。 实验室絮凝浮选时，在入料粒度不变的情况下，对应各种不同的絮凝剂用量，总的趋势是随着絮凝剂用量的增加，精煤的产率和灰分都增加。当絮凝剂用量为5~8kg/t时，对于平均粒度10μm左右的重介入料煤样，絮凝浮选后精煤产率50%时，精煤灰分低于0.9%。当絮凝剂用量为3~5kg/t时，对于平均粒度10μm左右的低灰煤样，絮凝浮选后精煤产率达到50%时，精煤灰分低于0.5%。 中试试验时，入料浓度和絮凝剂用量对分选指标影响明显，总体呈现出随着入料浓度增加或絮凝剂用量增大，精煤灰分不断增高的趋势。当浮选入料浓度为5%，在絮凝剂用量15kg/t时，重介入料煤和低灰煤经浮选后都可以得到灰分小于1%的超低灰洁净煤。当入料浓度为10%时，絮凝剂用量虽然达到15kg/t，重介入料煤经浮选精煤灰分超过1%。 通过实验室试验及中试试验证明，以太西无烟煤为原料，运用球磨—絮团—浮选工艺，可以得到灰分低于1%的超低灰洁净无烟煤且精煤产率较高。但受到分选工艺环节较为复杂生产成本较高以及超细粉碎环节及设备制约等影响，实现大型工业化生产还需进一步研究。

Nowadays the high ash content of clean coal has limited the application range of coal resource. There is an important constituent part for clean coal technology(CCT) and necessary way to utilize coal resource efficiently and cleanly by dropping ash content of product to bellow 1 percent, at the same time, expand the application range of coal resource. Therefore, dense media separation coal slack and low-ash clean coal of Taixi coal washery as raw material, with the research and development of new technology, new equipment and new processing, to test depth of the dissociative by stirred ball milling as well as selectivity flocculation flocculant-flotation, laboratory grinding-flocculation-flotation experiment was did at the first step, processing design and equipment selection were made, on the basis of getting great testing conditions, to put up laboratory continuous separation device and pilot scale test were set up. By the experimental investigation on Taixi coal superfine grinding of dissociation, mineral composition and characteristics, broken dissociation method and technology conditions were researched. The reconstruction of stirring mill could solve the grinding media and slurry separation, as a result, the processing capacity reached 150kg/h. For laboratory flocculation flotation, with the condition of enter material grain size unchanged and different amount of flocculant, showed the tendency that with the increasing in the amount of flocculant the yield and ash content of clean coal were lifted. At the dosage flocculant during 5~8kg/t for heavy intervention coal samples on the average <font color='red'>particle</font> size about 10μm, clean coal yield was 50% and ash content under 0.9% after flocculation flotation, and at the dosage flocculant during 3~5kg/t for low ash coal samples on the average <font color='red'>particle</font> size about 10μm, clean coal yield was 50% and ash content under 0.5%. On the pilot test, feed concentration and dosage of flocculant had significant effect to sorting index, which presented such current that with the increasing of feed concentration or flocculant content making clean coal ash content higher. When feed concentration was 5% and flocculant dosage was 15kg/t, after flotation of dense medium feeding coal and low ash coal could gain ultra-low ash clean coal that the ash content under 1%. When feed concentration was 10%, even if the flocculant content achieved 15kg/t, clean coal of dense medium feeding coal did reach 1%. Using Taixi anthracite as sample on laboratory and pilot test with ball milling-floccules-flotation technology to receive ash content under 1% of high productive rate ultra-low ash clean anthracite. Thanks to the impact of complicated technology links with cost of production, super fine crushing and equipment restriction that made large-scale industrial production need to the further research.