中高硫煤NaOH H_(2)O_(2)电解脱硫机理研究  

Investigating the mechanism of NaOH H_(2)O_(2)electrolytic desulfurization of medium-high sulfur coal

作　　者：滕弋非 鲁萌 贾喆 温家辉 赫梓岐 张芸鸣 张凌硕 高飞[1,2] 周西华[1,2] TENG Yifei;LU Meng;JIA Zhe;WEN Jiahui;HE Ziqi;ZHANG Yunming;ZHANG Lingshuo;GAO Fei;ZHOU Xihua(College of Safety Science and Engineering,Liaoning Technical University,Huludao 125105,Liaoning,China;Key Laboratory of Mine Thermodynamic disasters and Control of Ministry of Education,Liaoning Technical University,Huludao 125105,Liaoning,China)

机构地区：[1]辽宁工程技术大学安全科学与工程学院,辽宁葫芦岛125105 [2]辽宁工程技术大学矿山热动力灾害与防治教育部重点实验室,辽宁葫芦岛125105

出　　处：《安全与环境学报》2024年第11期4424-4433,共10页Journal of Safety and Environment

基　　金：国家自然科学基金青年基金项目(52304221)。

摘　　要：煤的含硫量过高会造成经济损失、环境污染,因此中高硫煤的利用受到了极大制约。为实现煤中硫的绿色高效脱除,研究设计了NaOH-H_(2)O_(2)电解脱硫体系,通过探究不同试验体系、不同试验因素对中高硫煤脱硫率的影响,确定了电解脱硫的最佳工艺条件;通过X-射线衍射(X-ray diffraction,XRD)、傅里叶变换红外光谱(Fourier Transform Infrared Spectrometer,FT-IR)和X-射线光电子能谱(X-ray Photoelectron Spectroscopy,XPS)分析各试验体系下煤中矿物质组分、官能团及硫元素形态变化以探究电解脱硫机理。NaOH-H_(2)O_(2)电解脱硫体系的最佳反应条件是:NaOH浓度为3 mol/L、电流强度为0.75 A、氧化剂30%H_(2)O_(2)的体积为25 mL、电解温度为40℃、电解时间为1 h。脱硫机理为:OH^(-)、H_(2)O_(2)在电解过程中生成了高活性的自由基O^(-)和·OH等,可促使煤中黄铁矿类无机硫被氧化成硫酸盐并进行脱除;硫醇、硫醚和噻吩类有机硫氧化成(亚)砜后,在碱性环境中会被水解为硫酸盐或磺酸类化合物并进行脱除。To mitigate the economic loss and environmental pollution associated with the use of medium to high sulfur coal,and to achieve efficient and environmentally friendly desulfurization,we designed the NaOH-H_(2)O_(2)electrolytic desulfurization system for the removal of sulfur from coal.Through investigating the impact of various experimental systems and factors on desulfurization rates,we determined the optimal experimental conditions.We employed X-ray Diffraction(XRD),Fourier Infrared Spectroscopy(FT-IR),and X-ray Photoelectron Spectroscopy(XPS)to analyze the functional group ratio and sulfur content in coal,thereby proposing a desulfurization mechanism.The experimental results are as follows:The optimal conditions for the NaOH-H_(2)O_(2)electrolytic desulfurization system were determined as follows:NaOH concentration of 3 mol/L,current intensity of 0.75 A,30%H_(2)O_(2)volume of 25 mL as an oxidizer,an electrolytic temperature of 40℃,and an electrolytic time of 1 hour.Under these optimal conditions,the desulfurization rate of coal reached its peak at 38.94%.Furthermore,when compared to the NaOH-H_(2)O_(2)immersion desulfurization system,the desulfurization rate increased by 27.37%with the application of an electric field.Additionally,compared to the NaOH electrolytic desulfurization system,the desulfurization rate increased by 8.98%after the addition of H_(2)O_(2).The primary functional groups in the coal remained unchanged;however,the content of sulfur-containing groups and ash were significantly reduced following treatment with the NaOH-H_(2)O_(2)electrolytic desulfurization system.Moreover,the increase in—OH groups in coal could create favorable conditions for the oxidation and breaking of organic sulfur bonds.The desulfurization mechanism of the NaOH-H_(2)O_(2)electrolytic desulfurization system is as follows:During electrolysis,OH^(-)and H_(2)O_(2)generate highly active free radicals O^(-)and·OH.These free radicals can enhance the oxidation effect and promote the conversion of pyrite inorganic sulfur in

关 键 词：环境工程学 中高硫煤 电解脱硫 氧化剂 脱硫机理 

分 类 号：X936[环境科学与工程—安全科学]