近几年，我国炼焦煤原煤年产量连续超过12亿吨，炼焦中煤年排放量超过3.6亿吨，大部分炼焦中煤被直接用作民用和电厂燃料。这部分二次资源没有得到有效利用，不仅是资源的浪费，而且造成了严重的环境污染。本文基于西曲中煤的煤岩学特征，采用超细粉碎－分级加工方法，以西曲炼焦中煤为研究对象，对其进行分质加工与利用研究。研究结果对于中煤资源合理利用具有一定指导价值。 通过筛分、浮沉、分布释放等试验，研究了中煤的粒级分布、密度组成和可浮性特征，通过煤岩光片和XRD分析，研究了煤样的显微组分和矿物质组成。结果表明，中煤的有机显微组分以镜质组占40.53%，无机显微组分中主要为黏土类矿物，占7.52%，有机组分与无机组分相互嵌入，呈分散状、浸染状、点状及层状的形式分布，嵌布特性较细；煤中的主要矿物组成为石英、黏土类矿物高岭石，以及少量的方解石、伊利石等；其组成主要为中高密度级产物，属“易浮难选”煤种。 在冲击粉碎－分级系统上，对中煤样品进行粉碎加工研究，用灰分、产率、d90粒度等指标综合评价了分质效果，在流化床气流粉碎－分级系统上进一步对中煤样品进行了超细粉碎分质加工研究。通过激光粒度分析、显微组分测试、X射线衍射分析、扫描电镜测试、X射线荧光光谱分析等，分析表征了分质产品的性质差异。为了研究流化床气流粉碎－分级系统对中煤的分质加工机制，通过人工将黄铁矿粉、石英粉、高岭土与太西超低灰精煤按1:1的质量比混合组成模拟中煤样，在流化床气流粉碎－分级系统上模拟中煤样的分质效果。矿物质的迁移规律是基于选择性粉碎的差异，不同矿物的冲击粉碎和摩擦粉碎作用效果不同，从而产生粒级分布的差异，最终通过精细分级实现分质作用。 测定了产品三的比表面积、表面电性、表面接触角及润湿性，结果表明，其符合橡胶填充剂的工业要求。将分质加工后的产品用于热解，产品一的焦油收率最高。通过上述研究的开展，为炼焦中煤超细加工后产品的材料化应用提供了依据及指导方向。

In recent years, the annual output of raw coking coal is more than 1.2 billion tons in China, while over 360 million tons coking coal’s middlings are produced every year. However, this part of secondary resources are not being effectively utilized, but being used directly as fuel in civilian power plants. This is not only a waste of resources, but also resulting in enormous environmental pollution. The high value-added processing and utilization has not been taken seriously. In this paper, ultra-pulverization classification system is applied to process Xiqu coking coal’s middlings based on coal petrology characteristics. The research possess instructive value for rational use of secondary resources. Through analysis of sieving, float-and-sink, releasing flotation, size density and composition of floating characteristics were studied. Mineral types and dissemination characteristics were detected by polarizing microscope and X-ray diffraction analysis. According to test results, organic components in coal is mainly vitrinite, accounting for 51.53%; inorganic components is mainly clay minerals, accounting for 7.52%. By X-ray diffraction analysis of the ash, it is found that the major minerals in coal are kaolinite clay minerals, also contains a small amount of quartz and illite. By microscopic analysis of coal samples, the organic and inorganic component was embedded in each other. Through froth flotation tests, it was found that the coal sample is easy to float but hard to separate. Therefore, it is difficult to achieve effective separation by gravity concentration or flotation process. impact crushing and classifying system was applied to process coal sample. Then ash, yield and d90 particle size were treated as the comprehensive valuation of the experimental results. Further research of ultra-pulverization on coal sample was conducted by using fluid bed airflow pulverization system.Through analysis of laser particle size, microscopic component testing, X-ray diffraction, scanning electron microscopy, X-ray fluorescence and other analysis, differences in the nature of the products were analyzed. In order to study the upgrading and processing function of ultra-pulverization classification system to middlings, pyrite quartz kaolin and low ash coal were mixed equally after crushing to -0.5mm. The selective crushing differences of minerals is the basis of minerals migration law. impact crushing and friction crushing possess different effect on minerals. Therefore, it results in differences in particle size distribution, and separation is achieved through precious grading ultimately. In order to explore the utilization ways of products, experiments of coal briquette and pyrolysis were conducted. It was found that the product with highest ash and coarsest particle got the highest tar yield. Based on the surface properties of the cyclone product, including specific surface area, surface charge, surface wettability , it was proposed that ultra-fine powder products can be used as rubber filling agent. Through the above experiments, it provides basis and guidance for the material application after ultra-fine processing.