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contained in the spent catalyst was powerful, part of zinc was still adsorbed in the pores of activated carbon and it was hardly to be desorbed completely. Otherwise, the zinc oxide discomposed from... increased the effective contact area between leaching agent and spent catalyst. When the microwave pretreated temperature reached a certain value, zinc acetate was decomposed into zinc oxide gradually......
density electrolysis. 2 Experimental 2.1 Solution preparation All chemical reagents, i.e. zinc sulfate, cadmium oxide, copper sulfate, ammonium sulfate, sulphuric acid and ammonia were used... or ammonia-ammonium sulphate solution while the other two had zinc, cadmium and copper ions in the different solutions, respectively. Cadmium oxide was dissolved in water by adding concentrated sulphuric......
-grade oxide zinc ore ZHANG Yu-mei, LI Jie, CHEN Qi-yuan, DING Hong-qing (School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China) Abstract: The influence of ultrasonic irradiation on the ammonia leaching of zinc from low-grate oxide zinc ore from Lanping was studied. The results show that the maximum leaching rate of zinc is 69.4% in NH3-NH4Cl-H2O solution......
Fundamental study on utilization of tin and zinc-bearing iron concentrate by selective chlorination JIANG Tao(姜 涛), ZHANG Yuan-bo(张元波), HUANG Zhu-cheng(黄柱成), LI Guang-hui(李光辉), GUO Yu-feng(郭宇... and zinc containing iron concentrate by chlorination roasting is developed. 2 EXPERIMENTAL 2.1 Characteristic of material The iron concentrate containing tin and zinc used......
Trans. Nonferrous Met. Soc. China 24(2014) 1179-1186 Selective recovery of lead from zinc oxide dust with alkaline Na2EDTA solution Qing LIU, Sheng-hai YANG, Yong-ming CHEN, Jing HE, Hao-tian XUE School of Metallurgy and Environment, Central South University, Changsha 410083, China Received 13 January 2012; accepted 25 September 2012 Abstract: The selective recovery of lead from the zinc oxide......
Preparation and characterization of ultrafine zinc oxide powder by hydrothermal method SHEN Xiao-yi(申晓毅)1, ZHAI Yu-chun(翟玉春)1, ZHANG Yan-hui(张艳辉)2 1. School of Materials... as dispersant agent, ultrafine zinc oxide powder was synthesized by hydrothermal method. Influence of NaOH concentration on morphology of ZnO powder was studied. The as-synthesized ZnO powder looked like......
words: low grade zinc oxide ores; Zn; flotation concentrate; electrowinning; MACA system; cycle leaching 随着锌冶炼工业的发展,硫化锌矿逐渐枯竭,人们将越来越重视氧化锌矿的开发利用[1-2].我国云南,贵州和四川地区氧化锌矿资源极其丰富,但大都是锌品位低于10%的高碱性脉石型低品位氧化锌矿[3-5...溶锌浸出率达到89.14%,浮选精矿锌的浸出率为79.75%,杂质元素的净化率达到95%,电解锌纯度达到99.98%,电流效率可达97.02%. 关键词:低品位锌矿；Zn；浮选精矿；电沉积；MACA体系；循环浸出 中图分类号:TF813 Cycle leaching of low grade zinc oxide ores in MACA system for ......
Recovery of gallium from zinc concentrate by pressure oxygen leachingXue-Lan Wu1,2,Wen-Qing Qin1,2,Shun-Ke Wu1,Xi-Hong Ma1,2,Yin-Jian Niu1,3,Cong-Ren Yang1,21. School of Minerals Processing..." name="ChDivSummary">Zinc concentrate with high gallium content is one of the main resources of gallium.The gallium presents in the form of isomorphism in tetrahedron coordination with sulfur......
) Abstract: The recovery of Zn and the regeneration of lixiviant from the Zn2+-Ida2--H2O solution which is obtained by low grade zinc oxide leached with iminodiacetic acid were investigated. Zn... precipitation process has a purity more than 97%. Key words: zinc oxide ore; iminodiacetic acid; precipitation; lixiviant reclamation 氧化锌矿的湿法处理方法主要包括酸浸[1-3],氨 浸[4-5]及碱浸[6-8]工艺,酸浸工艺因为其体系本身为酸性介质,对主金属Zn溶解不具选......
atomic absorption spectrometry gives the reliable results for lead, zinc and iron. However, since the sulphide concentrate is leached by cupric chloride solutions, the determination of copper... Leaching of complex sulphide concentrate in acidic cupric chloride solutions M. TCHOUMOU1, M. ROYNETTE2 1. Faculty of Science, Marien Ngouabi University, Brazzaville, Congo; 2. Laboratory......
