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 [46 journals]
- Effect of Baffle Design Parameters on Fluid Dynamic Response of a Coal
Abstract: Effect of Baffle Design Parameters on Fluid Dynamic Response of a Coal Classifier
Author Hamid KhoshdastHami KhoshdastVahideh Shojae
The effect of baffle design parameters including length, slope, shape, and installation position on fluid dynamic behavior of a coal classifier was simulated using computational fluid dynamic approach. General response of classifier at different conditions was interpreted by referring to turbulent patterns inside the sorting column and fluid velocity magnitude in products outlets. Results showed that the effect of design parameters is directly influenced by other operating factors such as feed pulp flowrate. The velocity of discharge streams can be used for the prediction of particle size variations of products due to any change in fluid dynamic pattern in classier.
- Characterization and Beneficiation of the Egyptian Organic Shale for
Possible Extraction of Organic Matter
Abstract: Characterization and Beneficiation of the Egyptian Organic Shale for Possible Extraction of Organic Matter
Author F. H. Abd El-RahiemM.S. HassanK.A. SelimN.A. Abdel-Khale
The present paper focused on obtaining concentrate enriched with organic matter that could be suitable for a retorting process from black shale which is organic shale from the Safaga area on the Red Sea Coast. X-ray diffraction and optical polarising microscope were used in evaluating black shale minerals. Attrition scrubbing and flotation were conducted for enrichment of organic matter in the black shale sample. Mineralogical studies revealed that black shale samples contain bituminous calcareous clay stone, quartz, apatite and pyrite. Rabah mine organic shale contains about 28% organic matter. The results of the different separation techniques indicated that attritioning and flotation techniques successively enriched the organic matter in the organic shale .The organic matter could be enriched in the black shale and obtained a concentrate with ~ about 59% assaying and ~ 85% recovery.
- On Fragmentation and Agglomeration Phenomena in an Ultrafine Dry Grinding
Process of the Egyptian Calcium Carbonate: the Role of Oleic Acid Addition
Abstract: On Fragmentation and Agglomeration Phenomena in an Ultrafine Dry Grinding Process of the Egyptian Calcium Carbonate: the Role of Oleic Acid Addition
Author F. H. Abd El-RahiemK. A. Seli
This study deals with ultrafine dry grinding of Egyptian calcium carbonate particles using a micronizer called “Planetary Mill”. As the size decreases during the process, the particles are strongly subjected to attractive interparticle forces leading to an aggregation phenomenon that generates a decrease in the surface area. In order to improve the process efficiency, the use of grinding aids, such as oleic acid, has been tested. The adsorption of the oleic acid on the particle surface is found to prevent the aggregation through an electrostatic effect that allows the surface area to be increased.
- Recent Trends in Flotation of Fine Particles
Abstract: Recent Trends in Flotation of Fine Particles
Author Fatma H. Abd El-Rahie
Fine particles are generated at the mines due to the mechanization and automation in the mining processes. Also, the occurrence of valuable minerals in a finely disseminated form necessitates fine grinding for liberation and subsequent physical separation. Because of the extremely complicated physico-chemico-mechanical conditions existing in the flotation process, the problems associated with the presence of fine particles are most pronounced in flotation. New trends to flotation of fine particles are carrier flotation, column flotation and bio- flotation. The carrier flotation technique is applied for upgrading of Egyptian kaolin and graphite. The carrier flotation technique has the advantage of reducing the long conditioning time needed for the pulp with the reagents in the conventional technique. But, the main draw backs of carrier flotation process in mineral beneficiation operations, are high reagent consumption and the necessity for subsequent separations of valuables from the carrier particles (when the valuable minerals are being recovered in the froth) . There is a great potential to recover of fine particles from their gangue using the recent technology such as column flotation or Air Sparged Hydrocyclone (ASH), after its modification to be suitable for flotation of very fine particles to beneficiate many ores such as kaolin, talc, graphite, phosphate and hematite. Bacteria and enzyme were used in the bio-flotation process to beneficiate the dolomitic phosphate to decrease MgO%.
- Investigations of Weathering Effects on Engineering Properties of Supare
Abstract: Investigations of Weathering Effects on Engineering Properties of Supare
Author Lawal A. I.Saliu Muyidee
Weathering and alteration in granite-gneiss has a deep impact on both the physical and mechanical properties of the rock. To investigate the impacts of weathering on engineering properties of granite gneiss, three samples each of weathered and un-weathered granite gneiss were collected from Supare. The collected samples were prepared in the laboratory for the determination of physico-mechanical properties of weathered and un-weathered rock samples. From the results of the analysis, weathered sample has average uni-axial compressive strength (UCS) value of 128 MPa while the Un-weathered indicated a UCS of 166 MPa. The Water Absorption for the weathered sample is 0.19 % while the Un-weathered is 0.11 %. The deformation characteristics of the rock sample for weathered and fresh rock were studied and result showed that the peak strain at failure is 5.11× 103 for the weathered sample and the Un-weathered is 4.53×103. The result of the testing confirm that the degree of weathering and the associated changes in the physico-mechanical properties of the granite-gneiss is directly related to the reduction in Uniaxial Compressive Strength, Point Load Index, Abrassion Resistance and Absorption of the weathered samples. The mode of failure of the rock has been found to be influenced by weathering extent in the rocks. The Un-weathered sample showed a brittle fracture at failure while the weathered showed a ductile behaviour. The study revealed that deformation characteristics are important characteristics for assessment of the behaviour of weathered granite-gneiss rock and thus for its suitability for engineering applications.
- Interaction Between Kaolinite and Staphylococcus Gallinarum Bacteria
Abstract: Interaction Between Kaolinite and Staphylococcus Gallinarum Bacteria
Author Nagui A. Abdel-KhalekKhaled A. SeiemSamah E. MohammedHoda H. El-HendawyReham M. Elba
Kaolin plays a very signiﬁcant role in the industrial aspects of life and new ones are still being discovered. It is a unique industrial mineral and very widely utilized in industry and its usage is inﬂuenced by its functional properties. However, the Egyptian kaolin is hard and massive. It is also low grade so that it needs beneficiation to be suitable for different industries. The kaolin used in most of the industrial applications should have very fine size distribution (80-90% by weight below 2 µm) and should be of high quality especially for applications like plastics, paints, paper industry, cosmetics, and pharmaceuticals. Moreover, great attention in recent years has been paid to the industrial applications of intercalated nano-composites where kaolin or clays are extensively used. Therefore, new technologies must be developed to achieve good separation, especially when treating these finely disseminated particles. One of such recent technologies is the bio-processing where micro-organisms could be used for removing these coloring materials. In this paper, the role of micro-organisms on the surface properties of the kaolin single mineral has been studied through zeta potential and adhesion measurements as well as the adsorption experiments. Complete characterization of both single mineral and bacteria isolated from its surface has been done using XRD, SEM, and FTIR as well as morphological and biochemical identification of bacterial isolates.
- Investigation of Geotechnical Parameters of Sandstone in Banda, Kogi
State, Nigeria Using Regression Model
Abstract: Investigation of Geotechnical Parameters of Sandstone in Banda, Kogi State, Nigeria Using Regression Model
Author LAWAL, Abiodun IsmailANIKOH, Godwin Ateiz
The study investigated geotechnical parameters of sandstone in Banda, Kogi State, Nigeria using regression model. To achieve the set objectives, in- situ tests were carried out by Schmidt hammer and laboratory tests were conducted on the sandstone samples collected from the study area. Five rock samples were prepared for the determination of density and porosity. The results obtained from the Schmidt hammer tests and those of density determined from laboratory tests were used to estimate the uniaxial compressive strength of the investigated rock. Point load index and tensile strength were determined from the laboratory tests and the relationship established by Brook, (1993) respectively. The results of the analyses reveal that the average density of sandstones is 2.08 g/cm3, the average porosity of the tested sandstones is 13.0% while the average uniaxial compressive strength value is 26.3 MPa. The average point load index and that of the tensile strength value are 1.17 MPa and 1.76 MPa respectively. The determined density, porosity, uniaxial compressive strength, point load index and tensile strength were analyzed statistically. From the statistical analysis mathematical models were established. The regression coefficients obtained from the analysis show that there are strong relationships between the physical and mechanical properties of sandstone.
- An Assessment of Existing Production and Revenue Capacities for Artisanal
and Small-Scale Granite Mining in Southwest Nigeria
Abstract: An Assessment of Existing Production and Revenue Capacities for Artisanal and Small-Scale Granite Mining in Southwest Nigeria
Author M. M. MelodiZ. O. Opafuns
This study presents an assessment of production capacity of artisanal granite mining in Nigeria. A production rating scale was developed by applying information obtained from site operators of over 5years experience using a prepared questionnaire, and a proposed production equation. Production was categorized into three conditions: “fair, “poor” and “worse”. Production and revenue in tonnes per month were calculated for each site. The obtained result was statistically analyzed to obtain useful values. An analysis of results established that both production and revenue ratings of most sites (56%) are in the poor and worst states. “Fair” production ranges between 227 and 1500 tonnes per month. This is equivalent to between 408,600 and 2,700,000 naira per month, and substantial. It was concluded that granite ASM has the capacity for employment generation and should be encouraged by Government.
- Open Pit Slope Design of Ajabanoko Iron Ore Deposit, Kogi State, Nigeria
Abstract: Open Pit Slope Design of Ajabanoko Iron Ore Deposit, Kogi State, Nigeria
Author Adebimpe R.AJ. M. AkandeArum
An appropriate open pit slope design is the one that considers both the safety and cost aspects to minimize waste excavation. Open pit slope design of Ajabanoko iron ore deposit, Nigeria was carried out using DIPS and SLOPE/W mine softwares. Compass clinometer and Geographic Positioning System (GPS) were used to determine the dip, dip direction and location respectively of joints on the iron ore deposit and this serves as an input data in the slope design. Fifty-two dip/dip direction values were plotted using DIPS mine software. The factor of safety of the designed slope was determined using limit equilibrium method included in the slope SLOPE/W program. In order to calculate the factor of safety for the designed slopes, inputs parameters, namely unit weight of the rock mass, internal friction angle and cohesion were used in the SLOPE/W program. The obtained result indicates that slope angles with orientation of 44/071, 50/270, 61/359, 46/178 were considered safe for the eastern, western, northern and southern section of the deposit respectively. The slope design carried out shows a factor of safety that varies from a lower limit of 2.89 to an upper limit of 3.84, and this indicates safe slopes in all sections of the deposit.