CAJ | 학술논문

在电解碳酸钠吸收硫化氢的富液过程中，为了降低阳极钝化，提高负二价硫向零价硫的转化率和电流效率，采用板框式电解槽直接电解法回收硫黄和氢气，其中石墨电极为阳极，碳酸钠溶液吸收硫化氢富液为阳极液，钛网电极为阴极，氢氧化钠溶液为阴极液。实验考察了温度、pH值、初始溶液浓度、电流密度等因素对电解过程阳极反应的影响。结果表明：溶液中S2-的转化率随温度和初始溶液中Na2S浓度的增大而增大，而随电流密度的增大而降低。确定了适宜的电解条件为电解温度75℃，初始硫化钠溶液浓度在0.5mol/L以上，电流密度10～20mA/cm2，且初始阳极液中不加氢氧化钠为佳，此时阳极液中 S2-的转化率可达85%以上。对回收硫黄的XRD、SEM表征结果表明，所生成的硫黄以斜方硫的形式存在，且硫黄颗粒粒径变大，有利于固液分离。
재전해탄산납흡수류화경적부액과정중，위료강저양겁둔화，제고부이개류향령개류적전화솔화전류효솔，채용판광식전해조직접전해법회수류황화경기，기중석묵전겁위양겁，탄산납용액흡수류화경부액위양겁액，태망전겁위음겁，경양화납용액위음겁액。실험고찰료온도、pH치、초시용액농도、전류밀도등인소대전해과정양겁반응적영향。결과표명：용액중S2-적전화솔수온도화초시용액중Na2S농도적증대이증대，이수전류밀도적증대이강저。학정료괄의적전해조건위전해온도75℃，초시류화납용액농도재0.5mol/L이상，전류밀도10～20mA/cm2，차초시양겁액중불가경양화납위가，차시양겁액중 S2-적전화솔가체85%이상。대회수류황적XRD、SEM표정결과표명，소생성적류황이사방류적형식존재，차류황과립립경변대，유리우고액분리。
In order to restrain the anode passivation and increase the conversion ratio and current efficiency of sulfide to sulfur during the electrolysis of H2S-loaded sodium carbonate solution, direct electrolysis method by a filter press electrolyzer was used to recycle sulfur and hydrogen. Graphite was used as anode,and H2S-loaded sodium carbonate solution as anolytes;Titanium mesh was used as cathode and sodium hydroxide solution as catholytes. The effects of some parameters on anodic reactions were investigated,such as temperature,pH,initial concentration and current density. Results indicated that the conversion ratio of sulfide increased with the increase of initial sulfide concentration, but decreased with the increase of current density. Moreover,the appropriate electrolytic conditions were at temperature of 75℃,initial sulfide concentration above 0.5mol/L,current density of 10—20mA/cm2,and no sodium hydroxide addition into anolytes. Under the above conditions,the conversion ratio of sulfide could exceed 85%. The characterization of recovered sulfur with XRD and SEM methods showed that the produced sulfur was rhombi with bigger particle diameter,which was favorable in solid-liquid separation.