采用H_(2)O_(2)-H_(2)SO_(4)梯度超声电解浮选法脱除煤中硫分和灰分的研究  

Sulfur and ash removal from coal using H_(2)O_(2)-H_(2)SO_(4) gradient sonoelectrochemical method with flotation

作　　者：石耀峰 马小燕[1,2] 张红喜[1,2,3] 胡德钞 SHI Yaofeng;MA Xiaoyan;ZHANG Hongxi;HU Dechao(College of Chemistry and Chemical Engineering,Tarim University,843300 Alar,China;Chemical Resources Utilization Engineering Laboratory in South Xinjiang of Xinjiang Production and Construction Corps,Tarim University,843300 Alar,China;State Key Laboratory of Mineral Processing,102628 Beijing,China)

机构地区：[1]塔里木大学化学化工学院,新疆阿拉尔843300 [2]塔里木大学新疆兵团南疆化工资源利用工程实验室,新疆阿拉尔843300 [3]矿物加工科学与技术国家重点实验室,北京102628

出　　处：《煤炭转化》2024年第1期28-37,共10页Coal Conversion

基　　金：国家自然科学基金地区基金项目(21868035);矿物加工科学与技术国家重点实验室开放基金项目(BGRIMM-KJSKL-2020-19);塔里木大学一流本科专业项目([2022]117)。

摘　　要：为脱除新疆库车煤中的硫分和灰分,采用一步超声电解浮选法和梯度超声电解浮选法对煤样进行处理,并对两方法的脱除效果进行比较。利用FTIR法、XPS法、XRD法、BET法分析煤样中官能团、形态硫、矿物质含量和孔结构的变化,利用XRF法测试煤灰中的主要成分。结果表明:梯度超声电解浮选法对煤中硫分和灰分的脱除效果优于一步超声电解浮选法对煤中硫分和灰分的脱除效果。采用H_(2)O_(2)-H_(2)SO_(4)梯度超声电解浮选法对煤样进行处理,脱硫率为55.38%,降灰率为56.75%。在电解过程中,煤的形态硫被·OH氧化为可溶于水的含硫离子而除去。由于每种电解质发生氧化还原反应的路径不同,因此,采用不同的电解质对煤进行分步电解,可提高硫分与灰分的脱除效果。此外,利用煤与矿物质亲疏水性不同的特征,采用浮选法对煤样进行处理,可有效降低煤中矿物质的含量。A comparative study on sulfur and ash removal from coal from Xinjiang Kuche mine using both one-step sonoelectrochemical method with flotation and gradient sonoelectrochemical method with flotation was conducted.Various characterization methods,including FTIR,XPS,XRD,BET and XRF,were used to analyze the alterations in functional groups,different forms of sulfur,mineral content and pore structure in the coal samples,and the main components in coal ash.The results indicate the greater effectiveness of the gradient sonoelectrochemical method with flotation in comparison to the one-step sonoelectrochemical method with flotation for sulfur and ash removal.When using H_(2)O2-H_(2)SO_(4) gradient sonoelectrochemical method with flotation,the desulfurization ratio and deashing ratio exhibite significant improvements,increasing to 55.38% and 56.75%,respectively.During the electrolysis process,the different forms of sulfur in coal are oxidized into water-soluble sulfur ions by hydroxyl radicals.As different electrolytes exhibit distinct redox pathways,a step-by-step approach utilizing different electrolytes for coal electrolysis can enhance the sulfur and ash removal effect in coal.Additionally,by leveraging the contrasting hydrophilic and hydrophobic properties of coal and minerals,using a floating method for coal treatment can effectively reduce the mineral contents in coal.

关 键 词：电化学 煤浮选 超声波 脱硫 降灰 

分 类 号：TQ536[化学工程—煤化学工程]