采用线性电位扫描(LSV)、电镜扫描(SEM)、交流阻抗(AC)及电感耦合等离子体原子发射光谱(ICP)测试技术研究了铅电极和不同铋含量的铅铋合金电极在硫酸溶液中氧化膜的生成情况。由恒电位0.9 V 20 m in后的线性电位扫描伏安曲线中PbO+PbO.P...采用线性电位扫描(LSV)、电镜扫描(SEM)、交流阻抗(AC)及电感耦合等离子体原子发射光谱(ICP)测试技术研究了铅电极和不同铋含量的铅铋合金电极在硫酸溶液中氧化膜的生成情况。由恒电位0.9 V 20 m in后的线性电位扫描伏安曲线中PbO+PbO.PbSO4和PbSO4还原电量可知,铅(Ⅱ)氧化膜生成量在铋质量分数低于0.103%时不受铋含量的影响,但铋含量较高时,随铋含量增加而增长;由电阻与电位的关系曲线可知,铋含量较高时,随铋含量增加,氧化膜电阻减小,电导增强;在1.6 V恒电位20 m in后的线性电位扫描伏安曲线表明,铋对PbO2的生成影响规律与铅(Ⅱ)氧化膜的相同;电镜扫描显示,生成的氧化膜随铋含量增长,结构更加疏松;ICP分析表明,不同含量铅铋合金电极中铋溶出量,随铋含量增加而增加。展开更多
To separate Pb from PbSO_(4)-coprecipitated jarosite,a novel thiourea-induced freeze-thaw cycling(T-FTC)process was investigated.Results show that distributed PbSO_(4)particles are pressed and aggregated around the ja...To separate Pb from PbSO_(4)-coprecipitated jarosite,a novel thiourea-induced freeze-thaw cycling(T-FTC)process was investigated.Results show that distributed PbSO_(4)particles are pressed and aggregated around the jarosite particles by T-FTC.Under the freezing-concentration effect of T-FTC,the reaction between PbSO_(4)and thiourea is also promoted,forming lead thiourea sulfate(Pb-tu).As the cycles of T-FTC increase,PbSO_(4)around jarosite disappears for the reaction of forming Pb-tu.After 12 cycles of T-FTC,a spontaneous separation is observed between Pb-tu and jarosite,i.e.,Pb-tu is separated into the upper layer while jarosite-rich phases remain in the lower layer.Due to this spontaneous separation,leaching toxicity of the jarosite coprecipitates is reduced by 73.7%.These results suggest that T-FTC process can achieve the separation of Pb from PbSO_(4)-coprecipitated jarosite and is a promising approach for removing and recovering metals from iron-rich jarosite residues.展开更多
A new approach to prepare PbSO4 powder is studied. Using the methods of the leaching of galena concentrates in the ferric chloride media,selective purification and chemical sedimentation,PbS concentrate can be convert...A new approach to prepare PbSO4 powder is studied. Using the methods of the leaching of galena concentrates in the ferric chloride media,selective purification and chemical sedimentation,PbS concentrate can be converted into PbSO4. The conversion recovery is 97.39%,the purity of PbSO4 powder is above 99% and its average crystallite size is about 42 nm. In this process,emission of lead vapour and SO2 cannot occur. The experimental results demonstrate the feasibility of realizing a green route to prepare the lead sulfate powder.展开更多
通过XRD、SEM、TGA-DSC等手段对不同浸酸时间的正生极板的物质相组成、形貌状态等进行分析测试,对不同浸酸时间下化成后正极板的化学组成进行分析,并组装2 V 10 Ah的试验电池,对其电气性能进行考察。结果表明,不同浸酸时间正生极板的物...通过XRD、SEM、TGA-DSC等手段对不同浸酸时间的正生极板的物质相组成、形貌状态等进行分析测试,对不同浸酸时间下化成后正极板的化学组成进行分析,并组装2 V 10 Ah的试验电池,对其电气性能进行考察。结果表明,不同浸酸时间正生极板的物质组成变化规律明显,且浸酸时间控制在0.5~1 h时化成后蓄电池的综合电气性能较好。展开更多
文摘采用线性电位扫描(LSV)、电镜扫描(SEM)、交流阻抗(AC)及电感耦合等离子体原子发射光谱(ICP)测试技术研究了铅电极和不同铋含量的铅铋合金电极在硫酸溶液中氧化膜的生成情况。由恒电位0.9 V 20 m in后的线性电位扫描伏安曲线中PbO+PbO.PbSO4和PbSO4还原电量可知,铅(Ⅱ)氧化膜生成量在铋质量分数低于0.103%时不受铋含量的影响,但铋含量较高时,随铋含量增加而增长;由电阻与电位的关系曲线可知,铋含量较高时,随铋含量增加,氧化膜电阻减小,电导增强;在1.6 V恒电位20 m in后的线性电位扫描伏安曲线表明,铋对PbO2的生成影响规律与铅(Ⅱ)氧化膜的相同;电镜扫描显示,生成的氧化膜随铋含量增长,结构更加疏松;ICP分析表明,不同含量铅铋合金电极中铋溶出量,随铋含量增加而增加。
基金financially supported by the National Natural Science Foundation of China(Nos.51904355,51825403)the National Key R&D Program of China(No.2020YFC1909201)。
文摘To separate Pb from PbSO_(4)-coprecipitated jarosite,a novel thiourea-induced freeze-thaw cycling(T-FTC)process was investigated.Results show that distributed PbSO_(4)particles are pressed and aggregated around the jarosite particles by T-FTC.Under the freezing-concentration effect of T-FTC,the reaction between PbSO_(4)and thiourea is also promoted,forming lead thiourea sulfate(Pb-tu).As the cycles of T-FTC increase,PbSO_(4)around jarosite disappears for the reaction of forming Pb-tu.After 12 cycles of T-FTC,a spontaneous separation is observed between Pb-tu and jarosite,i.e.,Pb-tu is separated into the upper layer while jarosite-rich phases remain in the lower layer.Due to this spontaneous separation,leaching toxicity of the jarosite coprecipitates is reduced by 73.7%.These results suggest that T-FTC process can achieve the separation of Pb from PbSO_(4)-coprecipitated jarosite and is a promising approach for removing and recovering metals from iron-rich jarosite residues.
基金Project(50774094) supported by the National Natural Science Foundation of China
文摘A new approach to prepare PbSO4 powder is studied. Using the methods of the leaching of galena concentrates in the ferric chloride media,selective purification and chemical sedimentation,PbS concentrate can be converted into PbSO4. The conversion recovery is 97.39%,the purity of PbSO4 powder is above 99% and its average crystallite size is about 42 nm. In this process,emission of lead vapour and SO2 cannot occur. The experimental results demonstrate the feasibility of realizing a green route to prepare the lead sulfate powder.
文摘通过XRD、SEM、TGA-DSC等手段对不同浸酸时间的正生极板的物质相组成、形貌状态等进行分析测试,对不同浸酸时间下化成后正极板的化学组成进行分析,并组装2 V 10 Ah的试验电池,对其电气性能进行考察。结果表明,不同浸酸时间正生极板的物质组成变化规律明显,且浸酸时间控制在0.5~1 h时化成后蓄电池的综合电气性能较好。
