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ferric ion-triggered surface oxidation of galena for efficient chalcopyrite-galena separation

International Journal of Minerals,Metallurgy and Materials 2024年第2期31卷 261-267页

作者： Qiancheng Zhang Limin Zhang Feng Jiang Honghu Tang Li Wang Wei Sun School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China Engineering Research Center of Ministry of Education for Carbon Emission Reduction in Metal Resource Exploitation and Utilization Changsha 410083China School of Resource and Environment Hunan University of Technology and BusinessChangsha 410083China

The efficient separation of chalcopyrite(CuFeS2)and galena(PbS)is essential for optimal resource ***,find-ing a selective depressant that is environmentally friendly and cost effective remains a *** various techniques,such as mi-croflotation tests,Fourier transform infrared spectroscopy,scanning electron microscopy(SEM)observation,X-ray photoelectron spec-troscopy(XPS),and Raman spectroscopy measurements,this study explored the use of ferric ions(Fe^(3+))as a selective depressant for *** results of flotation tests revealed the impressive selective inhibition capabilities of Fe^(3+)when used *** analysis showed that Fe^(3+)significantly reduced the adsorption of isopropyl ethyl thionocarbamate(IPETC)on the galena surface while having a minimal impact on *** analysis using SEM,XPS,and Raman spectra revealed that Fe^(3+)can oxidize lead sulfide to form compact lead sulfate nanoparticles on the galena surface,effectively depressing IPETC adsorption and increasing surface *** findings provide a promising solution for the efficient and environmentally responsible separation of chalcopyrite and galena.

关键词： galena chalcopyrite ferric ions flotation separation surface oxidation

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Biochemical Properties and Inhibition Kinetics of Phosphatase from Wheat Thylakoid Membranes

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Journal of Integrative Plant Biology 2006年第3期48卷 294-299页

作者： Mei-Juan Fei Jian-Sheng Chen Xiao-Yun Wang College of Life Sciences Shandong Agricultural University Taian 271018 China Shandong Key Laboratory of Crop Biology Shandong Agricultural University Taian 271018 China

A phosphetase that hydrolyses phosphate monoesters has been Isolated from wheat thylakold membranes. Biochemical properties and inhibition kinetics of the phosphatase were Investigated using several ions, organlc solvents, and Inhlbltors. Wheat （Trltlcum aestivum L. cv. PH82-2-2） thylakold membrane phosphatase activity was activated by Mg^2＋, Ca^2＋, and Fe^2＋ and was inhibited by Mn^2＋ and Cu^2＋. For example, enzyme activity was acUvated 34.81% by 2 mmol/l. Mg^2＋, but was Inhibited 22.3% and 8.5% by 2 and 1 mmol/L Cu^2＋, respectively. Methanol, ethanol and glycol were all able to activate enzyme activity. Enzyme activity was activated 58.5%, 48.2%, and 8.7% by 40% ethanol, methanol and glycol, respectively. From these results, It can be seen that the degree of actlvetlon of the phosphetase was greatest for ethanol and the type of acUvatlon was uncompetltlve. Moreover, the activity of the thylakold membrane phosphetase was Inhibited by molybdate, vanadete, phosphate, and fluoride and the type of Inhibition produced by these elements was uncompetltlve, non-competitive, competltlve and mixed, respectively.

关键词： calcium ions copper enzyme activity enzyme inhibitors enzymes ethanol ferric ions fluoride glycols ions kinetics magnesium manganese methanol molybdates phosphate phosphoric monoester hydrolases solvents thylakoids wh eat

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Two stage column leaching of uranium from uraninite ore

Two stage column leaching of uranium from uraninite ore

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中国核学会2011年学术年会

作者： D.X.Ding,Y.L.Liu,G.Y.Li,N.Hu,Y.D.Wang (Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China,Hengyang of Hunan Prov.421001,P.R.China)

The leaching process of uraninite ore was divided into the acidification and bacterial leaching stages,and the two stage leaching experiments and the control were conducted with 3 columns,each being charged with 20 kg uraninite *** ore contained 0.113%uranium,1.859%iron and large amounts of silica and *** the acidification stage,high to low concentration sulfuric acid solutions were used to acidify the uranium ore in each column until the pH of the pregnant leach solution from each column was maintained at *** acidification lasted for 18 d and the uranium recoveries for the three columns reached about 70%.In the bacterial leaching stage,column 1,as the control,continued to be leached with sulfuric acid solution with pH = 2.0,column 2,with the bacterial solution based on the indirect leaching mechanism,and column 3,with the bacterial solution based on the direct leaching *** leaching in this stage was continued until the concentrations of the uranium in the pregnant leach solutions from the three columns amounted to less than 50 mg/*** stage lasted for 20 d and the final uranium recoveries for columns 1,2 and 3 reached 73.72%,78.97%and 75.79%,respectively.

关键词： Acidification Bacterial leaching Acidithiobacillus ferrooxidans ferric ions Uraninite ore

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西安杨森成功的奥秘与启迪

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西安财经大学学报 1995年第4期 15-19页

作者：党兴华，康晓龙西安理工大学管理学院，西安杨森公司

西安杨森成功的奥秘与启迪党兴华，康晓龙西安杨森制药有限公司（以下简称西安杨森）是目前国内规模最大、剂型最全的中外合资制药企业。由比利时杨森制药有限公司和中国医药对外贸易总公司、中国医药工业公司、陕西省医药工业公司、汉... 详细信息

西安杨森成功的奥秘与启迪党兴华，康晓龙西安杨森制药有限公司（以下简称西安杨森）是目前国内规模最大、剂型最全的中外合资制药企业。由比利时杨森制药有限公司和中国医药对外贸易总公司、中国医药工业公司、陕西省医药工业公司、汉江制药厂四方合资经营。初期总投资１...

关键词： exrtaction trialkylphosphine oxide (TRPO) ferric ions

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