基于电场与软锰矿联合技术对高硫煤脱硫行为的强化  

Enhancement of high sulfur coal desulfurization behavior based onelectric field and pyrolusite combined technology

作　　者：刘作华[1,2] 袁海洋 郑国灿[3] 陶长元[1,2] 刘仁龙[1,2] 谢昭明[1,2] 杜军[1,2] 吴丙山[4] LIU Zuohua;YUAN Haiyang;ZHENG Guocan;TAO Changyuan;LIU Renlong;XIE Zhaoming;DU Jun;WU Bingshan(School of Chemistry and Chemical Engineering,Chongqing University,Chongqing 400044,China;State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China;Analysis and Testing Center,Chongqing University,Chongqing 400044,China;School of Economics and Business Administration,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学化学化工学院,重庆400044 [2]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400044 [3]重庆大学分析测试中心,重庆400044 [4]重庆大学经济与工商管理学院,重庆400044

出　　处：《煤炭学报》2022年第5期2078-2087,共10页Journal of China Coal Society

基　　金：煤矿灾害动力学与控制国家重点实验室自主研究课题重点资助项目(2011DA105287-zd201902)。

摘　　要：中高硫煤利用过程中产生大量的SO_(x)排放到空气中,对环境造成严重的污染,这导致其利用困难。为实现中高硫煤清洁高效利用,基于软锰矿中二氧化锰的强氧化性,采用电场与软锰矿联合的技术促进高硫煤脱硫,重点考察不同反应条件对高硫煤脱硫率及软锰矿中锰的浸出率的影响,利用XRD,FTIR,XPS等分析测试方法,研究脱硫反应前后煤元素组成、硫含量等主要性质变化,探究其脱硫机理。结果表明,当软锰矿与高硫煤质量比为1/7,煤浆质量浓度为0.05 g/mL,反应时间5 h,反应温度80℃,初始硫酸浓度为1.2 mol/L,电流密度为600 A/m^(2)时,与预处理煤相比,高硫煤脱硫率可达40.56%,锰的浸出率为95.23%。在相同反应条件下,与无电场浸出相比,电场的引入可使高硫煤脱硫率提高19.93%,软锰矿中锰的浸出率提高16.77%。经电场与软锰矿联合脱硫后的煤中的固定碳及热值略微降低,而挥发分和灰分略微增加,小分子增多,另外,煤中的分子结构基本未改变。在电场的作用下,软锰矿中二氧化锰的强氧化作用会促进煤粒表面有机分子键断裂,使高硫煤粒内部无机硫及有机硫充分暴露,并与电解生成的高价铁、锰离子发生反应,最终,无机硫被氧化为单质硫或者硫酸根离子脱除,有机硫则主要被氧化成亚砜及砜后水解,以达脱硫目的。During the utilization of medium and high-sulfur coal,a large amount of SO_(x) is emitted into the air,which causes serious pollution to the environment and makes its utilization difficult.In order to realize the clean and efficient utilization of medium and high sulfur coal,the technology of electric field combined with pyrolusite was used to intensify the desulfurization of high-sulfur coal based on the strong oxidizing capacities of MnO_(2) in pyrolusite.The effects of different reaction conditions on the desulfurization rate of high sulfur coal and the leaching rate of manganese in pyrolusite were investigated.Many analytical methods such as XRD,FTIR and XPS were employed to study the changes of coal element composition and sulfur content before and after desulfurization reaction,and the mechanism of desulfurization in high-sulfur coal was obtained.The results showed that when the mass ratio of pyrolusite to high sulfur coal was 1/7,the concentration of coal slurry was 0.05 g/mL,the reaction time was 5 h,the reaction temperature was 80℃,the initial sulfuric acid concentration was 1.2 mol/L and the current density was 600 A/m2,compared with pre-treated coal,the desulfurization rate of high-sulfur coal was 40.56%and the leaching rate of manganese was 95.23%.Under the same reaction conditions,compared with leaching without electric field,the introduction of electric field could increase the desulfurization rate of high-sulfur coal by 19.93%and the leaching rate of manganese in pyrolusite by 16.77%.After the desulfurization of electric field combined with pyrolusite,the fixed carbon content and calorific value in the coal decreased slightly,while the volatile and ash content increased slightly,and the small molecules increased.In addition,the molecular structure in the coal remained basically unchanged.Under the action of electric field,the strong oxidation of MnO_(2) in pyrolusite would promote the fracture of organic molecular bonds on the surface of coal particles,which made the inorganic and organic sulfur

关 键 词：高硫煤 电场强化 软锰矿 脱硫机理 氧化 

分 类 号：TQ150.6[化学工程—电化学工业]