Journal of Mining World Express
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Open Access journal
ISSN (Print) 2169-642X - ISSN (Online) 2169-6438
Published by Science and Engineering Publishing Company [49 journals]
- Evaluation of Suitability of Some Selected Rocks for Dimension Stone
Quarry in Akure, Ondo State, Nigeria
Abstract: Evaluation of Suitability of Some Selected Rocks for Dimension Stone Quarry in Akure, Ondo State, Nigeria
Author Afeni Thomas BusuyiMoshood OnifadeOmotayo Bolaji Raphae
The evaluation ofrock suitability for dimension stone quarry has been a thing of concern to the dimension stone industries. So, three granite rocks were selected in various locations in Akure, Ondo State, Nigeria. The locations are Iloyin, Oba-ile and Apatapiti and on these outcrops,in-situ tests were carried out on the outcrops and irregular rock samples were collected for laboratory tests. Schmidt hammer test and Scan line mapping for discontinuities analysis were done on site while sample test for density, specific gravity, average water absorption, point load strength and slake durability were done in the laboratory. The Apatapiti outcrop hasthe highest average density (3.12g/cm3), specific gravity (2.822) and water absorption value (0.84%), while the Iloyin outcrop exhibits the highest average durability (97.88%) and point load strength (5.79MPa), the Oba-Ileoutcrop have the highest compressive strength (190MPa)and average Schmidt hammer hardness value (47.0). The three outcrops volumetric joint count, Jv estimated gave medium block sizes but in the case of block quality of the rockssubjected to evaluation Iloyin happens to be of poor quality while Oba-Ileand Apatapiti outcrop have prospect ofproducing fair quality block. With the information fromthe assessment of block size, block quality and mechanical and physical properties for the rocks consideredin this paper work, it was observed that these three selected outcrop are not good for dimension stone quarry but can be quarried as aggregate stone for construction purposes.
- Bio-flotation of Egyptian Phosphate Using Desulfvibrio Desulfuricans
Abstract: Bio-flotation of Egyptian Phosphate Using Desulfvibrio Desulfuricans Bacteria
Author K. A. SelimN. A. Abdel-KhalekK. E. YassinS. S. Abdalla
The bio-flotation and bio-flocculation processes concern the mineral response to the bacterium presence, which is essentially considered as interplay between microorganism and the physicochemical properties of the mineral surface. The adhesion of microorganisms to minerals results in alteration of surface chemistry of minerals relevant to beneficiation process due to a consequence of the formation of a biofilm on the surface or bio-catalyzed surface oxidation or reduction products. In this paper, the amenability of utilization of Desulfvibrio desulfuricans isolated and adapted on surfaces of phosphate ore, as flotation reagents for separating silica from apatite in the bio-flotation of quartz-apatite minerals system has been studied. The effect of this bacterial isolates on the surface properties of the two single minerals has been studied through zeta potential and adhesion measurements as well as micro-flotation tests. The effect of pH of the medium on the surface properties and flotation behaviour of each single mineral is determined. Flotation of binary mixtures of quartz-apatite as well as natural phosphate ore has also been performed at different operating parameters. Different characterization techniques for both single minerals and bacteria isolated from their surfaces have been done using XRD, SEM, and contact angle as well as morphological and biochemical identification of bacterial isolates.
- Mineral Industry in Egypt – Part II Non-Metallic Commodities
Abstract: Mineral Industry in Egypt – Part II Non-Metallic Commodities –Phosphate Rocks
Author Kh. G. ElmaadawyM. Ezz El DinA. M. KhalidAbdel-Zaher M. Abouzei
Phosphorus is an essential element in the buildup of the human body and all other livings skeletons. The main source of phosphorus is the natural phosphate. About 95 percent of the produced phosphates are consumed in the agricultural sector as fertilizers and animal feed stocks. Most of the balance is converted into phosphoric acid and elemental phosphorus which are the raw materials for manufacturing various phosphate compounds. The world annual phosphate production in 2012 is around 217 million tons, and the global reserves amount to 67 billion tons. With the population increase, researchers estimate that the existing phosphate reserves cover the world needs of phosphates for more than 100 years to come. Egypt has about 4 percent of the world phosphate reserves (2.78 billion tons), and produces about 3 percent of the world phosphate production (about 6 million t/y). The present article covers different aspects of the Egyptian phosphate rocks. The phosphate deposits in Egypt lie between latitudes 23ο 10 – 30ο 50΄ N, whereas the payable zone lies between latitudes 24ο 30΄ – 26ο 50΄ N. They extend longitudinally from the Red Sea Coast to El Dakhla Oases. Geologically, the economic phosphate beds belong to the central facial zone of the Upper Senonian age (Upper Cretaceous and Lower Eocene) deposits. They cover the Red Sea Coast, Nile Valley, and Western Desert. The P2 O5 content ranges between 20 and 32 %. The gangue constituents are mainly carbonates, silica, and silicates (clays), depending on the region and locality. The phosphate ore is mined by open cast and/or underground mining. The underground mining is either long-wall or room-and-pillar mining methods. Upgrading the phosphate rock is done through: crushing, screening, attrition scrubbing, desliming, and drying naturally or artificially. Flotation is a promising technique for the removal of all sorts of gangue minerals. This has been tested in laboratory and semi-pilot scales.