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Effectiveness of gravity separation of Low Grade Nigerian Gold Ore Using Shaking Table

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International Journal of Nonferrous Metallurgy 2022年第2期10卷 15-22页

作者： Oluwasanmi Samuel Teniola Abraham A. Adeleke Simeon Ademola Ibitoye Moshood Deinde Shitu Department of Chemical and Minerals Engineering First Technical University Ibadan Nigeria Department of Materials Science and Engineering Obafemi Awolowo University Ile Ife Nigeria

The response of Imogbara (Nigeria) gold ore to shaking tabling gravity separation methods was investigated in this research work. Gold concentration in run-off mines is usually as low as 0.005 ppm and must be upgraded in order to reduce the recovery process extraction costs. gravity separation method (the focus of this work) is one of the readily affordable beneficiation methods. Shaking table is a developed separation equipment of gravity method that has been adopted to increase concentrate based on difference of specific gravity. The output result of the concentration process using shaking table is basically influenced by a number of variables, such as rotational shaking speed, particle size and deck slope. In this research, the range of rotational speed shaking was between 100 rpm and 200 rpm, the particle size was between (−300 μm > X −75 μm) and deck slope was between 10°and 30°. EDXRF was used to measure gold concentration in the concentrate as well as the tailings. The result shows that the optimum condition is obtained at a shaking speed of 100 rpm, with a slope of 10°and particle size less than 75 μm.

关键词： gravity separation Concentrate Gold Ore Shaking Table Upgraded

Beneficiation of the gold bearing ore by gravity and flotation

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International Journal of Minerals,Metallurgy and Materials 2012年第2期19卷 106-110页

作者： Alim Gül Olga Kangal Ayhan A. Sirkeci Güven nal Mineral Processing Engineering Department Istanbul Faculty of Mines Technical University Istanbul 34469 Turkey

Gold concentration usually consists of gravity separation, flotation, cyanidation, or the combination of these processes. The choice among these processes depends on the mineralogical characterization and gold content of the ore. Recently, the recovery of gold using gravity methods has gained attention because of low cost and environmentally friendly operations. In this study, gold pre-concentrates were produced by the stepwise gravity separation and flotation techniques. The Knelson concentrator and conventional flotation were employed for the recovery of gold. Gold bearing ore samples were taken from Gümüshane Region, northern east part of Turkey. As a result of stepwise Knelson concentration experiments, a gold concentrate assaying around 620 g/t is produced with 41.4wt% recovery. On the other hand, a gold concentrate about 82 g/t is obtained with 89.9wt% recovery from a gold ore assaying 6 g/t Au by direct flotation.

关键词： gold ore treatment beneficiation gold gravity separation flotation

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Effects of magnetic field on fluidization properties of magnetic pearls

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China Particuology 2007年第1期5卷 151-155页

作者： Maoming Fan Zhenfu Luo Yuemin Zhao Qingru Chen Daniel Tao Xiuxiang Tao Zhenqiang Chen Department of Mining Engineering University of Kentucky 230 Mining and Mineral Resources Building Lexington KY 40506 USA School of Chemical Engineering and Technology China University of Mining and Technology Xuzhou 221008 Jiangsu China

An experimental study of the influence of external magnetic field on the fluidization behavior of magnetic pearls was carried out. Magnetic pearls are a magnetic form of iron oxide that mainly consists of Fe2O3 which are recovered from a high-volume power plant fly ash from pulverized coal combustion. Due to its abundance, low price and particular physical and chemical properties, magnetic pearls can be used as a heavy medium for minerals or solid waste dry separation based on density difference. This paper introduces the properties of magnetic pearls and compares the performance of magnetic pearls fluidised bed operation with or without an external magnetic field. Experimental results show that an external magnetic field significantly improves the fluidization performance of magnetic pearls such as uniformity and stability.

关键词： Magnetic pearls Magnetic field Fluidization properties gravity separation

Experimental study on separation of valuable refractory aggregate from investment casting ceramic shell waste

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China Foundry 2016年第4期13卷 243-247页

作者： Ji-gao Li Yuan-cai Li Shi-ming Tan School of Materials Science and Engineering Huazhong University of Science and Technology Hanchuan Shijin Technology Co. Ltd.

In the present study, a processing technique for recycling investment casting ceramic shell waste was proposed to separate valuable refractory aggregate zircon sand. The microstructure and phase constituents of the shell waste and separation process were investigated. The results show that the characteristics of microstructure and phase constituents of the shell waste can meet the conditions for preferential y separating zircon sand, and zircon sand can be separated by gravity separation on a shaking table. The separated zircon sand has good shape and high purity, and can be used for the production of castings and other applications.

关键词： investment casting ceramic shell waste zircon sand magnetic separation gravity separation

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Effects of magnetic field on fluidization properties of magnetic pearls

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Particuology 2007年第Z1期 151-155页

作者： Maoming Fana,b, Zhenfu Luob, Yuemin Zhaob, Qingru Chenb, Daniel Taoa, Xiuxiang Taob, Zhenqiang Chenb a Department of Mining Engineering, University of Kentucky, 230 Mining and Mineral Resources Building, Lexington, KY 40506, USA b School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221008, Jiangsu, China

关键词： Magnetic pearls Magnetic field Fluidization properties gravity separation

The Use of Process Analysis and Simulation to Identify Paths to Improve the Operation of an Iron Ore gravity Concentration Circuit

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Advances in Chemical Engineering and Science 2020年第3期10卷 149-170页

作者： Maryam Sadeghi Claude Bazin Hatch Ltd. Montréal QC Canada Department of Mining Metallurgy and Materials Engineering Laval University Quebec QC Canada

The processing of iron ore to recover the valuable iron oxide minerals is commonly carried out using spiral concentrators that separate valuable minerals from non-valuable ones on the basis of the specific gravity of minerals. This paper shows that the analysis of the operation of spirals should not only focus on the minerals (as it is usually the case), but should also consider the particle size of these minerals. Indeed, the sampling of two industrial iron ore circuits and the data processing of the resulting measurements show that unexpectedly about 10% of the coarse heavy iron oxide minerals are not recovered by the spirals of the two circuits. Tests conducted by an independent research center confirm this plant observation. The pilot plant tests also show that the wash water flowrate addition may adversely affect the recovery of coarse heavy mineral particles. A mathematical model for the spiral was implemented into a simulator for an iron ore gravity concentration circuit. The simulator shows a potential 0.7% increase of iron recovery by simply changing the strategy used to distribute the wash water between the rougher and the cleaner/recleaner spirals of the circuit. The simulator also shows that the introduction of a hydraulic classifier into the gravity concentration circuit yields a marginal improvement to the performances of the circuit.

关键词： Iron Ore gravity separation Spiral Concentrators Hematite Hydraulic Clas-sifier Particle Size Partition Curves

Experimental Research on Beneficiation Process for a Specularite Ore

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Experimental Research on Beneficiation Process for a Specula...