洁净煤技术

2020, v.26;No.128(04) 64-71

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高硫煤深度浮选联合化学氧化脱灰脱硫提质研究
Study on deashing,desulfurization and upgrading of high sulfur coal by deep-flotation combined with chemical oxidation

熊明金;黄叶钿;符剑刚;赵迪;王晓波;
XIONG Mingjin;HUANG Yetian;FU Jian'gang;ZHAO Di;WANG Xiaobo;Shanghai Rupai Mining Equipment Co.,Ltd.;School of Chemistry and Chemical Engineering,Central South University;

摘要(Abstract):

随着我国优质煤资源逐渐减少,高硫煤等劣质煤的开发利用是保障煤炭能源安全的重要途径,而高硫煤脱灰脱硫提质是高硫煤清洁高效利用的首选方案。采用深度浮选联合氧化方法对贵州某高硫煤进行脱灰脱硫提质研究,通过接触角测试不同捕收剂的性能,研究不同捕收剂对浮选脱灰的影响规律,不同灰分抑制剂和硫分抑制剂对浮选脱灰脱硫的影响,并进行闭路浮选试验。采用化学氧化对浮选精煤进一步脱硫处理,研究了不同氧化剂对浮选精煤化学脱硫的影响规律,并通过红外光谱和扫描电镜证明脱灰脱硫机理。结果表明,与柴油相比,复合捕收剂M7015对浮选脱灰更有优势,原煤接触角为62.5°,M7015处理后煤炭接触角提高了15.0°,柴油处理后接触角提高了5.0°,M7015最佳用量为800 g/t。Ca O作为脱硫抑制剂效果较好,用量为4 000 g/t,灰分抑制剂S-4的最佳用量为1 000 g/t。经过"一粗—二扫—二精"闭路浮选试验流程,得到灰分5.62%、硫含量1.34%的浮选精煤。双氧水和冰醋酸混合液的氧化脱硫效果最佳,浮选精煤经氧化处理后得到灰分5.60%、硫含量0.88%的低灰低硫精煤。SEM分析表明附着在煤炭表面的颗粒减少,表面光滑,裂缝之间的矿物颗粒明显减少,深度浮选脱灰脱硫效果明显。红外光谱表明深度浮选联合化学氧化不改变煤炭的基本结构,能脱除大部分灰分,浮选脱除大部分黄铁矿等无机硫,化学氧化脱除硫醚和亚砜等部分有机硫。说明深度浮选联合化学氧化的新工艺实现了高硫煤脱灰脱硫提质,得到高品质低灰低硫精煤产品。
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.

关键词(KeyWords): 高硫煤;脱硫;浮选;化学氧化;脱灰
high sulfur coal;desulfurization;flotation;chemical oxidation;deashing

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

作者(Author): 熊明金;黄叶钿;符剑刚;赵迪;王晓波;
XIONG Mingjin;HUANG Yetian;FU Jian'gang;ZHAO Di;WANG Xiaobo;Shanghai Rupai Mining Equipment Co.,Ltd.;School of Chemistry and Chemical Engineering,Central South University;

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DOI: 10.13226/j.issn.1006-6772.19112502

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