Limited availability and large industrial demands of high-grade coals have forced many coal-dependent industries to shift their preference towards low-grade coals to meet the feedstock requirements. The low-grade coals due to their poor washability nature do not respond efficiently toward existing coal beneficiation techniques making the cleaning process challenging. Inefficient cleaning of such coals could potentially lead to environmental problems such as solid waste generation and gaseous emissions during combustion. Therefore, it is important to upgrade the existing coal beneficiation techniques for improving the clean coal quality, and simultaneously enhance the efficiency of the process. In the past few decades, many techniques have been developed to improve existing coal beneficiation techniques. Among them, ultrasound technology has gained significant attention due to its ability to enhance the process performance. The incorporation of ultrasound can significantly increase the clean coal yield under the substantial effect of cavitation and streaming. In this paper, an overview on the recent development in ultrasonic-based coal beneficiation techniques and the role of ultrasound in improving the efficiency of various coal beneficiation techniques are discussed. This includes a critical review of the ultrasound mechanism in enhancing coal demineralization, desulphurization, grindability, slurryability and dewatering.

高等级煤的有限供应和庞大的工业需求迫使许多依赖煤炭的行业将其偏爱转向低等级煤以满足原料需求。由于低级煤的可洗性差，因此不能有效地应对现有的煤炭选矿技术，从而使清洁工艺面临挑战。对此类煤的低效清洁可能会导致环境问题，例如燃烧过程中产生固体废物和排放气体。因此，重要的是升级现有的煤选矿技术，以提高清洁煤的质量，同时提高工艺效率。在过去的几十年中，已经开发了许多技术来改善现有的煤炭选矿技术。其中，超声技术因其能够增强工艺性能而备受关注。在空化和流动的显着影响下，超声的引入可以显着提高清洁煤的产量。本文概述了基于超声波的选煤技术的最新进展以及超声波在提高各种选煤技术效率中的作用。这包括对超声机制在增强煤的脱盐，脱硫，可磨性，可浆化性和脱水性方面的严格审查。概述了基于超声波的选煤技术的最新进展以及超声波在提高各种选煤技术效率中的作用。这包括对超声机制在增强煤的脱盐，脱硫，可磨性，可浆化性和脱水性方面的严格审查。概述了基于超声波的选煤技术的最新进展以及超声波在提高各种选煤技术效率方面的作用。这包括对超声机制在增强煤的脱盐，脱硫，可磨性，可浆化性和脱水性方面的严格审查。