Abstract Only when problems in ultrafine coal particle beneficiation process are well understood and clarified, efficient methods can be devised to recover ultrafine coal particles in an economically viable way. When minerals are fully liberated from organic substances in the grinding process, coal beneficiation methods are needed to efficiently separate organic materials from mineral ones. This is necessary for clean coal technologies as the pollutants associated with coal utilization are the key factor in limiting the sustainability of coal utilization. To assess the current state of knowledge available in this area, a comprehensive literature review on the ultrafine coal particle beneficiation techniques is carried out with main focus on recent progresses. In this paper, previous studies on the ultrafine coal beneficiation have been critically analyzed with respect to the effects of particle sizes and surface properties. The techniques are classified into two categories, physical separation (including gravity, magnetic and electrostatic separation method) and physico-chemical separation (including oil agglomeration and bubble flotation method). The aim of this paper is to review developments and limitations of current ultrafine coal particle beneficiation techniques and also to identify the future development in recovering ultrafine coal particles.

中文翻译：

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超细煤粒选矿新进展

摘要 只有充分理解和澄清超细煤颗粒选矿过程中存在的问题，才能设计出经济可行的有效方法来回收超细煤颗粒。当矿物在磨矿过程中从有机物质中完全释放出来时，需要采用选煤方法来有效地将有机物质与矿物物质分离。这对于清洁煤技术来说是必要的，因为与煤炭利用相关的污染物是限制煤炭利用可持续性的关键因素。为了评估该领域现有知识的现状，对超细煤颗粒选矿技术进行了全面的文献综述，主要关注最近的进展。在本文中，先前对超细煤选矿的研究已经根据粒度和表面特性的影响进行了批判性分析。技术分为物理分离法（包括重力、磁力和静电分离法）和物理化学分离法（包括油团聚法和气泡浮选法）两大类。本文的目的是回顾当前超细煤颗粒选矿技术的发展和局限性，并确定回收超细煤颗粒的未来发展。磁和静电分离法）和物理化学分离（包括油团聚法和气泡浮选法）。本文的目的是回顾当前超细煤颗粒选矿技术的发展和局限性，并确定回收超细煤颗粒的未来发展。磁和静电分离法）和物理化学分离（包括油团聚法和气泡浮选法）。本文的目的是回顾当前超细煤颗粒选矿技术的发展和局限性，并确定回收超细煤颗粒的未来发展。