Browsing by Author "Jimoh, Abdulrasaq"
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Item Characterisation and treatment of spent deposited sludge of transformer oil (DSTO) by acid leaching and solvent extraction(Published by Taylor & Francis on behalf of the Institute and The AusIMM, 2017-08-31) Baba, Alafara A.; Ayodele, Joshua S.; Ameen, Oloduowo M.; Jimoh, Abdulrasaq; Johnson, Uduakobong; Jimoh, Bilikisu A.; Lawal, AmudatThe characterisation of spent transformer oil to determine its fitness for re-refining as well as the recovery of metals by hydrometallurgical treatment in chloride medium has been investigated. The leaching experiments on the spent material showed that its dissolution increases with leachant concentration performed at 75°C. Leaching studies showed that at optimal conditions, the dissolution reached 93% by 1.0 mol L−1 HCl solution within 120 min at 75°C. The solvent extraction of copper by bis(2,2,4-trimethylpentyl) phosphinic acid (CYANEX®272) in kerosene from a pregnant solution of aqueous spent deposited sludge of transformer oil containing 1243.4 mg L−1 Cu++, 389.2 mg L−1 Fe++/+++, 110.7 mg L−1 Ca++ and 235 mg L−1 Al+++ was studied. The results for the solvent extraction give an extraction efficiency of 91.77% total copper acquired via 0.2 mol L−1 CYANEX®272 in kerosene at 27 ± 2°C within 25 min at pH 4.0. A 0.1 mol L−1 HCl solution was found to be sufficient for the stripping of about 94.77% copper from the loaded organic phase. The Fourier transform–infrared spectroscopic analysis of the loaded organic phase supports the stripping experiment as there was no Cu metal ion present in the separated organic phase.Item Development of Overvoltage and under voltage Protection System for A Residential Building Interfaced with a GSM Notification System(Abubakar Tafawa Balewa University Bauchi, Nigeria, 2023-03) Jimoh, Abdulsamad Bolakale; Otuoze, Abdulrahaman Okino; Yesufu, Leila; Jimoh, Abdulrasaq; Omoyeni, Raphael Oluwatimileyin; Omeiza, Isaac Ozovehe Avazi; Abdullateef, Ayodele IsqeelOvervoltage and under voltage are undesirable conditions capable of causing damages to electrical appliances. In literature, detection and protection of electrical appliances from these voltage irregularities have been largely explored. Nonetheless, load control during irregularities and fault location remains subjects of considerations. In this work, an overvoltage and undervoltage protection system is designed for a residential building. The voltage limits of 240 V and 200 V are set for overvoltage and undervoltage protection, respectively. The protective system unit is developed utilizing a PIC 16F876A microcontroller. A GSM module, SMS 808, with the capacity to send an SMS and location via longitude and latitude, is interfaced for notification and tracking purposes. With the aid of a variac, five different levels of voltage are fed as input for each condition (normal, overvoltage, undervoltage). At each stage of the tested conditions, the protection system operated as set and notifications were sent as programmed. The results revealed that the device can disconnect the load when there are irregularities as well as notifying the utility company and consumers of the locations.