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作 者:何环[1,2] 韩亚涛[1,2] 石开仪[3] 洪芬芬 朱红威[1,2] 冷云伟[1,2] 陶秀祥[1,2] 郑雷[4] 马陈燕 赵屹东[4]
机构地区:[1]中国矿业大学化工学院,江苏徐州221006 [2]中国矿业大学煤炭加工与高效洁净利用教育部重点实验室,江苏徐州221006 [3]六盘水师范学院化学与化学工程系,贵州六盘水553004 [4]中国科学院高能物理研究所国家同步辐射实验室,北京100049
出 处:《煤炭学报》2017年第5期1304-1310,共7页Journal of China Coal Society
基 金:国家自然科学基金资助项目(51204184;51504134);贵州省"125计划"重大科技专项资助项目([2013]026号)
摘 要:利用嗜酸铁/硫氧化微生物Acidithiobacillus thiooxidans SOB-1和Acidithiobacillus ferrooxidans SOB-2浸出煤矸石,利用XRD和硫的K边X-ray Absorption Near Edge Spectroscopy(XANES)分析煤矸石浸出前后物相组成和硫的形态变化。XRD结果表明:经浸出处理后矸石中黄铁矿消失,其他矿物组成变化不明显。XANES结果表明,原始矸石中硫形态主要是黄铁矿硫,氧化型谷胱甘肽硫,硫代硫酸盐硫,单质硫和少量噻吩硫。与空白对照相比,SOB-1对矸石浸出效果较差,样品中各种形态硫的含量变化不明显;而SOB-2及SOB-1和SOB-2的混合菌对矸石中总硫和黄铁矿均有较好的脱除效果,其脱除率最高可达51.08%和71.5%。矸石样品中的黄铁矿硫经氧化转变成硫代硫酸盐硫和硫酸盐硫,SOB-2和混合菌明显促进了硫的形态变化,并且两株菌及其混合菌可能对噻吩硫也有一定脱除效果。Acidophilic iron and sulfur oxidizing microorganisms Acidithiobacillus thiooxidans SOB-1 and Acidithiobacillus ferrooxidans SOB-2 were used to bioleach the coal gangue,and its sulfur speciation variations after leaching were analyzed with XRD and sulfur K-edge X-ray absorption near edge spectroscopy (XANES).XRD results showed that the pyrite in coal gangue disappeared after leaching treatment,however,the other mineral components always remained unchanged.XANES showed that the sulfur speciation in original coal gangue were mainly sulfur of pyrite,oxidized glutathione,thiosulfate,sulfate and a small amount of thiophene (DBT).Compared with sterile control,the SOB-1 had poor effect on gangue leaching and the sulfur content variation in which was not obvious.Nevertheless,both SOB-2 and the mixed culture of SOB-1 and SOB-2 had an excellent ability on removing total sulfur and sulfur of pyrite in coal gangue and the highest removing rate of which were up to 51.08% and 71.5%,respectively.The pyrite in coal gangue could be oxidized to thiosulfate and finally to sulfate,furthermore,the SOB-2 and mixed culture clearly improved the transformation of sulfur speciation.On the other hand,it seems that both two strains and their mixtures had ability to remove the sulfur of DBT.
关 键 词:嗜酸铁/硫氧化菌 煤矸石 硫形态 X射线吸收近边结构光谱
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