Research progress on resource utilization of solid waste from coal beneficiation
Coal beneficiation is the premise and foundation for clean and efficient utilization of coal,and the solid waste(gangue and tailing,etc.)generated from the beneficiation process has been increasing year by year,and its comprehensive treatment and utilization has become an important problem to be solved.The physical and chemical properties of coal beneficiation solid waste is introduced,the research progress on resource utilization of the waste is summarized,and the existing problems and development direction of comprehensive utilization technology is analyzed and prospected.Coal beneficiation solid waste,mainly comprised of coal gangue and coal tailing,is endowed with a considerable amount of lithium,gallium,titanium and other trace elements,which provides promising utilization potential in power generation,mine filling,building materials preparation,soil reclamation,and high value utilization.At present,the utilization path of coal gangue is more comprehensive,in which,used as filling material has a great potential for bulk consumption,represented by(super)high water filling technology,mining filling+X technology.Resource utilization of tailing coal is a hot spot in recent years,and breakthroughs have been made in environmental management and soil improvement,which can be used to prepare adsorbents,soil conditioners and other materials.The future of coal solid waste should also focus on adapting to market demand and the concept of sustainable development,through technology improvement,the introduction of intelligentization and so on to further realize the efficient,safe and environmentally friendly comprehensive utilization of solid waste coal beneficiation.
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