SHI Da;ZHANG Jianbo;YANG Chennian;QU Jiangshan;LI Shaopeng;LI Huiquan;HE Fayu;

• 1:School of Resources and Civil Engineering
• 2:Northeastern University
• 3:Key Laboratory of Green Process and Engineering
• 4:Institute of Process Engineering

Abstract：

Coal gasification technology is the foundation of modern coal chemical industry in China.In this process,the organic matter in coal is converted into chemicals,and the inorganic matter is discharged in the form of gasification slag.At present,coal gasification slag is mainly stored in piles,causing serious environmental and water pollution.In the process of dissipating coal gasification slag,because of the large amount of unburned carbon inside,the large-scale utilization channels such as construction materials and building materials are limited.Although the current carbon and ash separation methods at home and abroad have certain effects,they are basically in the stage of laboratory research and semi-industrial testing.Due to the problems of high cost and low separation efficiency,large-scale industrial applications have not been realized.The separation of carbon ash is affected by the mineral phase composition,phase composition,particle size distribution,micro-morphology and other factors of coal gasification slag.Different types of gasification slag need to adopt different separation processes to achieve efficient separation of carbon and ash.Combined with the main influencing factors of coal gasification slag decarburization,the main technology and equipment of coal gasification slag decarbonization were analyzed,the main separation methods of carbon and ash components of coal gasification slag were expounded from multiple angles,and the technological characteristics and shortcomings of each sorting method were further Summarized and compared.Finally,the development trend of various technologies in the decarbonization and separation of coal gasification slag was analyzed,and the development of new green,efficient,and low-cost flotation reagents was pointed out to solve the problem of unburned carbon-ash adsorption cover.The separation technology and equipment for the decarbonization of granular coal gasification slag and the realization of high-value utilization of decarbonization separation products is an important development direction of current coal gasification slag decarbonization technology.

Key Words： coal gasification slag;decarbonization;flotation;separation;resource utilization

Abstract:

Keywords:

Foundation: 国家重点研发计划资助项目(2019YFC1904302);; 国家自然科学基金资助项目(51804293,U1810205);; 固废资源化利用与节能建材国家重点实验室开放基金资助项目(SWR-2019-005);; 中石化合作企业横向资助项目(419035-3)

Authors: SHI Da;ZHANG Jianbo;YANG Chennian;QU Jiangshan;LI Shaopeng;LI Huiquan;HE Fayu;

DOI: 10.13226/j.issn.1006-6772.EP20082501

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