ZHOU Bingyi;ZHOU Tao;LI Yang;GE Tao;

• 1:School of Materials Science and Engineering
• 2:Anhui University of Science & Technology

Abstract：

Sulfur is the main harmful element in coal.The emission of sulfur during coal utilization is an important cause of acid rain.Desulfurization is one of the research hotspots for clean utilization of coal.Microwave has the function of promoting the reaction and accelerating the reaction rate.Microwave combined with chemical auxiliaries is an important means of coal desulfurization. In this paper,the effects of sulfur removal in coal were studied by microwave irradiation combined with three chemical additives.The effects of microwave irradiation time,chemical additives types and coal types on desulfurization were investigated by orthogonal test. The results show that the coal types have a great influence on the desulfurization efficiency of microwave assisted additives,and the optimum irradiation time of the selected three coal samples is different.Among the three chemical additives selected,the desulfurization effect of nitric acid combined with microwave is the best.The removal rate of total sulfur in Guizhou( GZ) coal can reach 71.2% under the action of microwave combining with nitric acid.The morphological sulfur test analysis shows that the removal efficiency of inorganic sulfur after coal desulfurization is higher,up to 90.5%,and the removal efficiency of organic sulfur is between 20% and 40%.XRD spectrum analysis shows that after the desulfurization of microwave assisting chemical additives,there is no significant change in the main minerals and coal structure in the coal.The microwaves can maintain the stability of coal matrix while removing sulfur from coal.Through the analysis of XPS spectrum,it is known that the removal of sulphur thioethers and organic sulphur from coal samples is better,the removal rate can reach 49.4%,the sulfoxides are slightly lower,the removal rate is 23%-28%,the removal of the thiophene organic sulfur is the worst,and the removal rate is between 10% and 20%.

Key Words： coal;desulfurization;microwave;additive;XRD;XPS

Abstract:

Keywords:

Foundation: 中国博士后科学基金资助项目(2018M632519);; 安徽省博士后基金资助项目(2017B169)

Authors: ZHOU Bingyi;ZHOU Tao;LI Yang;GE Tao;

DOI: 10.13226/j.issn.1006-6772.19040202

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