Abstract

Hard coal is an important source of energy worldwide. Owing to the imperfections of excavation technology, most run-of-mine coals must be processed before they can be utilised as fuel. In this study, tests on the dry separation process were performed with numerous different raw hard coal and coal waste material samples, using a newly designed and constructed negative-pressure pneumatic separator (NPPS). The experiments revealed the effects of the feed-material properties and material processing conditions. These experiments were preceded by additional tests for evaluating the influence of each device operating parameter on the process, to determine the optimal method of supplying the feed material. The calorific value of the processed materials was improved by 5%–40%, while a minimal output yield of products (60%–70%) was maintained. The trials indicated that in coal material processing, the developed NPPS can be used for not only raw coal enrichment but also coal recovery from materials stored at coal-waste dumps. The main advantages of the device are its mobility, low material processing cost, and lack of water consumption during operation.

Graphic abstract

中文翻译：

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负压气力分离器：硬煤选矿的新解决方案

摘要

硬煤是全球重要的能源。由于挖掘技术的缺陷，大多数矿用煤必须经过加工才能用作燃料。在这项研究中，使用新设计和构造的负压气动分离器（NPPS）对大量不同的原硬煤和煤废料样品进行了干法分离过程的测试。实验揭示了进料特性和材料加工条件的影响。在这些实验之前，还进行了其他测试，以评估每个设备的运行参数对过程的影响，以确定最佳的进料方法。加工后的材料的热值提高了5％–40％，同时保持了产品的最低产量（60％–70％）。试验表明，在煤炭原料加工中，开发的NPPS不仅可以用于原煤富集，而且还可以从废煤场中存储的原料中回收煤炭。该设备的主要优点是它的移动性，较低的材料处理成本以及操作过程中的水消耗少。

图形摘要