Department of Mining Engineering
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- ItemInfluence of thermal ageing on the microstructural and mechanical characteristics of banana stem particles reinforced aluminium-alloy matrix composites(2024) Sefiu Adekunle Bello; Abdul Ganiyu Funsho Alabi; Suleiman Danjuman Daudu; Stephen Durowaye; Mohammed Kayode Adebayo; Luqman Babatunde Eleburuike; Sikiru Ottan Abdulraman; Shuaib Ajibola MohammedThe influence of thermal ageing on the microstructural and mechanical characteristics of banana stem particles (BSp) reinforced aluminium-alloy matrix composites was investigated. Sand casting was used to produce the composites, comprising aluminium alloy matrix reinforced with BSp of varying weight ratio of 0 wt. %, 1 wt. %, 3 wt. %, 4 wt. %, 5 wt. % and 6 wt. % were thoroughly mixed. Test samples for mechanical characterisation were prepared from the sand cast (6 mm diameter by 125 mm rods for tensile test). Thermal ageing was done for 2 hours (hrs) at 350 0C. The composites were evaluated for tensile, modulus of elasticity, hardness, and microstructural characteristics. The thermally aged samples demonstrated greater tensile strength and toughness as the concentration of BSp increased up to 5 wt. % in the composite in comparison with the as-cast samples. The greatest characteristics were demonstrated at 5 wt. % BSp concentration. Lower hardness was demonstrated by the as-cast samples in comparison with the aged-hardened samples. There was 5 wt. % BSp concentration in the alloy enhanced thermal ageing. These indicate that greater mechanical characteristics of the composites can be obtained by thermal ageing.
- ItemCorrosion Inhibition Efficacy of Hybrid Organic Extracts from Prosopisafricana and Citrulluslanatus on Mild Steel in Acidic Medium(2023) Yusuf Lanre SHUAIB-BABATA; Israel Victor AYINDE; Yusuf Olanrewaju BUSARI; Mubarak Oloduowo AMEEN; Raheem Abolore YAHYA; Ibrahim Owolabi AMBALI; Ishaaq Na’allah AREMU; Sikiru Ottan ABDULRAMAN; Kabiru Suleiman AJAO; Abdulateef Alabi GARUBAEach of Prosopis Africana pod extract (PAPE) and Citrulluslanatus (WMPE) performed quite well as green inhibitors in the electrochemical corrosion in acidic solution at ambient temperature in previous research. However, the hybridization of these compounds was varied with the concentration ratio in this study to optimize the efficiency of the green inhibitor in a hydrochloric acid medium using mild steel. The extraction process of the inhibitor samples was carried out with the Soxhlet apparatus using n-hexane as the solvent. Furthermore, the potential inhibition efficiency was monitored using various corrosion measurement techniques at room temperature. The inhibitive response of the extracts could be attributed to the adsorption of the extracts’ components on mild steel surface by physisorption mechanism according to the Langmuir adsorption isotherm model. The results revealed that inhibition efficiency (IE%) depends on the concentration of the extracts. The peak IE% values were obtained with a hybrid ratio of 3:1 (PAPE: WMPE) for gravimetric technique. The Tafel polarization and gasometrical measurement technique is 96.7%, 98.5% and 83.1% respectively at the concentration of 1.0 g/L, which are above the peak IE% for PAPE (93.7%, 80.96% and 77.8%) and WMPE (92.7%, 80.5% and 75.6%).
- ItemComparative analysis of drilling performance of kymera and PDC bits in salt formation(2020) Alaba O.C.; Abdulraman S. OThe study compares the drilling performance of Kymera and PDC bits in salt formation using River and Delta State Continental Shelf of Nigeria as a case study. The measurement while drilling (MWD) and the logging while drilling (LWD) methods were used to measure the real time well drilling operation. well formation and drilling statistics. The data obtained from the Ogbaimbiri. Ossiomo. Utorogu and Okporhuftu wells have the penetration rate of 6.2 m/hr. 5.9 m/hr. 12.2 m/hr. 6.3 m/hr for Kymera bit and 4.2 m/hr. 3.4 m/hr. 6.8 m/hr. 3.9 m/hr for PDC bit respectively. The pearson correlation coefficient has a value of r = 0.897. n = 4. p<0.05 and r = 0.784. n = 4. p<0.05 for both kymera and PDC bits. The results established a strong and positive correlation between the penetration rate and distance drilled in each bit. It also shows that the higher the penetration rate the more the distance drilled by each bit. The study concluded that the Kymera bit was more efficient as it was able to penetrate the different formations with a lesser time and at a greater penetration rate.
- ItemEvaluation of Remedial Option's Efectiveness of Lead Contaminated Site in Bagega Community, Zamfara State , Nigeria(2017) Alaba O. C.; Abdulraman S. OThe study evaluates the remedial option's effectiveness of lead contaminated site in Bagega community, Zamfara state. Samples of soil and water were collected from residential compounds (BRC), residential garden (BRG), village common area (BVC), processing areas (BPA), farmland areas (BFA), wells (BWE), boreholes (BBH) and ponds (BPO)water at the same locations before and after remediation using standard procedures of ASTM D6907 and APHA respectively. The concentrations of lead metal in soil and water samples before and after remediation were determined using Atomic Absorption Spectrophotometer (AAS) in accordance with ASTM D 3559 and ASTM D1976 standard methods. The results revealed that soil samples recorded the highest lead concentration reduction of 96.1% in BRG while the least lead concentration reduction of 51.7% was recorded in BFA after remediation. Water samples recorded least lead concentration reduction of 21.0 % in BBH and highest lead concentration reduction of 70.8% in BPO after remediation. On the health risk analyses, BPA/01, 07 and 11; BFA/04, 07 and 08 posed health risk to the people while BPO/02, 06 and 09 posed no health risk to the people after remediation. The study therefore concluded that remediation was completely effective at BRC, BRG and BVC but it was not completely effective at BPA and BFA.
- ItemMechanical properties of calcium carbonate/eggshell particle filled polypropylene Composites(2020) Kabiru Mustapha; Rashidat Ayinla; Abdulraman Sikiru Ottan; Tunji Adetayo OwoseniCalcium carbonate is widely used as a filler material in the production of polymer matrix composites and studies have shown that eggshell contains about 94% calcium carbonate. The effect of calcium carbonate from eggshell particles in polypropylene was studied in this work and the result compared with unreinforced polypropylene. Industrially synthesized calcium carbonate/eggshell particles were used as filler in polypropylene matrix with varying mass fractions from 5 to 20 wt. % at 5 wt. % increment. The produced samples were mechanically characterized for indentation hardness and uniaxial tensile properties using a Rockwell hardness tester and universal mechanical testing machine respectively. These properties were measured at different compositions to determine its compositional dependence. Microstructural analysis of the composites top and fracture surface was also carried out using scanning electron microscope to examine possible failure mode. The results were compared to measure the effect of reinforcement and the replacement criteria for the conventional calcium carbonate. The results obtained showed that calcium carbonate reinforced polypropylene has its highest tensile strength, elastic modulus and modulus of rupture at 5 wt. %, ductility and modulus of resilience at 10 wt. %, and hardness at 15 wt. %. The results also showed that granulated eggshell can provided appreciable improvement in the mechanical properties of polypropylene as obtainable in mineral calcium carbonate reinforced polypropylene.