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Usage of Iranian scoria for copper and cadmium removal from aqueous solutions

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Journal of Central South University 2015年第10期22卷 3760-3769页

作者： Sara Seyfi Amir Reza Azadmehr mahdi gharabaghi Abbas Maghsoudi Department of Mining & Metallurgical Engineering Amirkabir University of Technology School of Mining Engineering College of Engineering University of Tehran

The competitive removal of copper and cadmium from aqueous solutions using scoria has been investigated. Scoria was characterized by various methods, such as XRD, XRF, FT-IR and SEM. The results show that scoria sample contained augite, enstatite, diopside, and olivine. These minerals were separated from each other and each mineral was then subjected to the adsorption experiments. It was found that the main absorbent constituent in scoria was augite. Finally, statistical experimental method was used to optimization of adsorption conditions(Initial concentration of copper and cadmium ions, the amount of scoria and temperature) for removal of Cu(II) and Cd(II) ions from solution in optimum conditions. The optimum conditions are obtained as follows: concentrations of Cu(II) and Cd(II) of 400×10-6 and 554×10-6, respectively; amount of scoria of 7 g; temperature of 38 °C. Under these conditions Cu(II) and Cd(II) ions are absorbed onto the scoria more than 79% and 16%, respectively.

关键词：镉离子水溶液除铜 Cu(II) 应用伊朗顽火辉石吸附实验

Germanium separation and purification by leaching and precipitation

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Journal of Central South University 2016年第9期23卷 2214-2222页

作者： Saeid Bayat Sajjad Aghazadeh Mohammad Noaparast mahdi gharabaghi Behrooz Taheri School of Mining Engineering College of Engineering University of Tehran

In this research work, extraction and purification of germanium from zinc leach residues(ZLR) were investigated. The results of ICP, XRF, and atomic adsorption spectroscopy(AAS) tests show that contents of germanium, iron, lead, and zinc within the leaching residue were 105×10^(-6), 3.53%, 10.35%, and 8.8%, respectively. XRD results indicate that the main minerals were in different forms of sulfates(CaSO_4·2H_2O, PbSO_4 and ZnSO_4·6H__2O), silicate(SiO_2), and oxide(Fe_2O_3). Dissolution of leaching filter cake was carried out using 5 parameters and each in 4 levels(acid concentration, temperature, time, liquid-to-solid ratio, and stirring speed) by Taguchi method(L_(16)), and then optimization of the effective parameters by response surface method. Under optimum conditions, zinc and germanium dissolution efficiencies were 88.71% and 8%, respectively. Leaching tests with sulfuric acid(added di-ammonium oxalate monohydrate) and hydrochloric acid(HCl) on the residues obtained from previous-stage sulfuric acid dissolution, yielded germanium and iron recoveries of 83%, 88%, 40%, and 90%, respectively. Thus, leaching experiment with sulfuric acid(added di-ammonium oxalate monohydrate) was superior to that with hydrochloric acid due to high and low extraction amounts of germanium and iron, respectively. Precipitation experiments revealed that germanium purification with tannic acid presented a better result compared to sodium hydroxide and ammonia. Under optimum conditions, contents of germanium and iron in the solution after precipitation were 0.1505% and 14.7% with precipitation yields of 91% and 52%, respectively.

关键词：锌浸出渣沉淀分离纯化 Taguchi法锗原子吸收光谱法铁回收率最佳条件

Effects of nanobubble and hydrodynamic parameters on coarse quartz flotation

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International Journal of Mining Science and Technology 2019年第2期29卷 289-295页

作者： Sabereh Nazari Sied Ziaedin Shafaei mahdi gharabaghi Rahman Ahmadi Behzad Shahbazi Fan Maoming School of Mining Engineering College of Engineering University of Tehran Department of Mining Engineering Imam Khomeini International University Mining Engineering Department Tarbiat Modares University EFD Eriez Manufacturing Co.

Quartz, the second most abundant mineral in the earth's crust, is a gangue mineral in practically every flotation process. Coarse quartz flotation has been a long standing problem in various mineral processing plants to reduce milling cost and increase valuable mineral recovery. Based on this, the effects of nanobubbles(NBs) and hydrodynamic parameters on coarse quartz particle flotation were systematically investigated. Mechanical flotation experiments were carried out using the 7 cm and 9 cm diameter impellers in order to produce different hydrodynamic conditions. 900–1300 rpm impeller speeds were used for the 7 cm diameter impeller and 554–786 rpm for the 9 cm diameter impeller. The results show that the presence of NBs increased the flotation recovery of à425 + 106 lm quartz by up to 21%. For the7 cm diameter impeller, the maximum flotation recoveries of 86.4% and 98% were obtained in the absence and presence of NBs at Reynolds number(Re) of 81,000 and 66,000, respectively. For the 9 cm diameter impeller, the maximum recoveries of 86.3% and 97.5% were obtained in the absence and presence of NBs at Re of 90,000 and 75,000, respectively. NBs increased the flotation rate constant up to 36%.

关键词： Flotation Nanobubbles Coarse particle Quartz Hydrodynamic parameters

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化学和物理分离法萃取金、汞、银（英文）

稀有金属材料与工程 2016年第11期45卷 2784-2789页

作者： Yaser Olyaei Sajjad Aghazadeh mahdi gharabaghi Hassan Mamghaderi Jahanbakhsh Mansouri 德黑兰大学伊朗德黑兰 Pouya Zarkan Aghdareh金厂伊朗Takab

采用搅拌过滤法对Aghdareh金矿样品进行金的萃提。矿物学研究表明,样品中58%的金颗粒小于10μm,该等级的3%属于难熔金。实验结果表明,在最优条件下,金回收率可达91.8%,银和汞分别为41.5%和10.2%。以氰化法测试的6种分次尺寸样品的结果表... 详细信息

采用搅拌过滤法对Aghdareh金矿样品进行金的萃提。矿物学研究表明,样品中58%的金颗粒小于10μm,该等级的3%属于难熔金。实验结果表明,在最优条件下,金回收率可达91.8%,银和汞分别为41.5%和10.2%。以氰化法测试的6种分次尺寸样品的结果表明,未萃取的金粒子大多小于25μm,还有大约5%的金颗粒大于25μm。因此,对样品要进一步粉碎,这样可使金和银回收率分别提高约3.57%和约5%,进一步粉碎样品并不影响汞的回收率。采用Knelson重力选矿法可提高汞回收率并防止金和汞的混合,利用氰化法检测重力法的尾料。这些方法的结合应用,最终使金回收率达到93.3%,汞回收率增加到42.16%,而银回收率没有明显的变化,为42.17%。

关键词：金银汞氰化法 Knelson方法