XIONG Mingjin;HUANG Yetian;FU Jian'gang;ZHAO Di;WANG Xiaobo;

• 1:Shanghai Rupai Mining Equipment Co.
• 2:Ltd.
• 3:School of Chemistry and Chemical Engineering
• 4:Central South University

Abstract：

With the gradual decrease of high-quality coal resources in China,the development and utilization of low-quality coal such as high-sulfur coal is an important way to ensure the safety of coal energy.The research on deashing and desulfurization and upgrading of high sulfur coal is the first choice for clean and efficient utilization of high sulfur coal.In this paper,a deep flotation combined oxidation method was used to conduct a deashing and desulfurization and upgrading experiment of high-sulfur coal in Guizhou.The contact angle was used to test the performance of different collectors,and the effects of different collectors on flotation deashing were studied.The influencing laws of different ash inhibitors and sulfur inhibitors on flotation desulfurization and desulfurization were conducted in closed-circuit flotation experiments.The chemical oxidation was used to further desulfurize the flotation clean coal.The effect of different oxidants on the chemical desulfurization of flotation clean coal was studied.The mechanism of deashing and desulfurization was proved by infrared spectroscopy and scanning electron microscopy. The results show that,compared with diesel,the composite collector M7015 has more advantages in flotation deashing.The contact angle of raw coal is 62.5°.The contact angle of coal after M7015 treatment is increased by 15.0°,and the contact angle after diesel treatment is increased by 5.0°,the optimal dosage of M7015 is 800 g/t.Calcium oxide has a good effect as a desulfurization inhibitor,the dosage is 4 000 g/t,and the optimal dosage of ash inhibitor S-4 is 1 000 g/t. Through the " one coarse-two sweep-two fine" closed-circuit flotation test process,the flotation clean coal with 5.62% ash and 1.34% sulfur content is obtained.The mixed solution of hydrogen peroxide and glacial acetic acid has the best oxidative desulfurization effect.After the flotation clean coal is oxidized,low-ash low-sulfur clean coal with ash content of 5.60% and sulfur content of 0.88% is obtained.SEM analysis shows that the particles attached to the coal surface are reduced,the surface is smooth,the mineral particles between the cracks are significantly reduced,and the effect of deep flotation deashing and desulfurization is obvious. Infrared spectroscopy shows that deep flotation combined with chemical oxidation does not change the basic structure of coal,but can remove most of the ash,and most of the inorganic sulfur such as pyrite is removed by floation,and some organic sulfur such as sulfide and sulfoxide is removed by chemical oxidation.This shows that the new process of deep flotation combined with chemical oxidation has achieved the experimental goal of deashing,desulfurization and upgrading of high-sulfur coal,and obtained high-quality low-ash and low-sulfur clean coal products.

Key Words： high sulfur coal;desulfurization;flotation;chemical oxidation;deashing

Abstract:

Keywords:

Foundation: 国家自然科学基金青年科学基金资助项目(21506259)

Authors: XIONG Mingjin;HUANG Yetian;FU Jian'gang;ZHAO Di;WANG Xiaobo;

DOI: 10.13226/j.issn.1006-6772.19112502

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