【摘要】 为提高炼焦中煤的解离效果与精煤产率，在对蒋庄选煤厂重介中煤原样进行XRD、SEM、XRF等原煤性质分析的基础上，对中煤原样进行了筛分、浮沉、破碎试验和浮选条件优化。筛分试验结果显示，该煤样的灰分为37.56%，粒级分布均匀，大于6 mm粒级占比57.79%。浮沉试验表明，该煤样主导密度级为1.6 g/cm~3～1.8 g/cm~3，具有解离再选的潜力。通过XRF分析，发现煤样中硅、铝和硫含量较高，可能影响浮选效果。破碎试验表明，粒度大于1 mm破碎方案为最佳方法，在精煤灰分为8.80%时，获得精煤最大产率为13.61%（理论值）。针对浮选条件的优化，采用响应曲面法对捕收剂、起泡剂和磨矿时间进行调整，得到推荐的捕收剂、起泡剂、磨矿时间等参数值。实际浮选结果验证了模型的可靠性，为蒋庄选煤厂重介中煤的高效利用提供了理论依据和实践指导。更多还原

【Abstract】 To enhance the liberation effect and clean coal yield from coking middlings, this study conducted XRD, SEM,XRF and other raw coal property analyses on the original dense medium middling samples from Jiangzhuang Coal Preparation Plant, and carried out screening, flotation, crushing tests and flotation optimization on the original samples. The screening test results showed that the ash content of the coal sample was 37.56%, and the particle size distribution was uniform, with the proportion of particle sizes larger than 6 mm being 57.79%. The floating and sinking test showed that the dominant density grade of this coal sample was 1.6 g/cm~3 to 1.8 g/cm~3, having the potential for liberation and re-selection. Through XRF analysis, it was found that the content of silicon, aluminum and sulfur in the coal sample was relatively high, which might affect the flotation effect. The crushing test showed that the crushing scheme greater than 1 mm was the best method, while the ash content of the obtained clean coal was 8.80%, the yield of clean coal was 13.61%(theoretical value). For the optimization of flotation conditions, the response surface method was adopted to adjust the collector, frother and grinding time, getting their recommended parameter values. The actual flotation results verified the reliability of the model, providing a theoretical basis and practical guidance for the efficient utilization of dense medium middlings at Jiangzhuang Coal Preparation Plant.更多还原