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Bhatti M.A.,Mineral Processing Research Center | Kazmi K.R.,Mineral Processing Research Center | Mehmood R.,Mineral Processing Research Center | Akram A.,Mineral Processing Research Center
Pakistan Journal of Scientific and Industrial Research Series A: Physical Sciences | Year: 2014

The beneficiation of a siliceous scheelite ore of Chitral, Khyber Pakhtoonkhwa, Pakistan, was investigated by flotation process to determine the optimum conditions for obtaining maximum grade and recovery of the scheelite concentrate. The variables studied were including pH and pulp density maintained during conditioning, type and quantity of reagents added, conditioning time and froth collecting time. The results achieved were plotted against the grade and recovery of the rougher concentrate. Several methods of cleaning rougher concentrate were attempted. An ore initially containing 0.34% WO3 was upgraded into a final concentrate assaying 64.66% WO3 with 70.36% recovery. The tungsten concentrate obtained meets the specifications required to produce ferrotungsten and tungsten chemicals.


Mehmood R.,Mineral Processing Research Center | Habib M.,Mineral Processing Research Center | Bhatti M.A.,Mineral Processing Research Center | Yousaf A.,Mineral Processing Research Center | Sheikh S.T.,Mineral Processing Research Center
Pakistan Journal of Scientific and Industrial Research Series A: Physical Sciences | Year: 2011

Underground coal gasification (UCG) experimentation was carried out on low-rank lignite coal of Eastern Salt Range, Chakwal, Punjab Province, Pakistan. A simulation reactor was designed in laboratory environments and gas input volume, type of gas input, gasification linkage and mode of combustion were investigated. Geological characteristics of the coal were also studied. The composition of emitted gases was evaluated and the syngas having calorific value of2.42 MJ/m3 was produced.


Bhatti M.A.,Mineral Processing Research Center | Kazmi K.R.,Mineral Processing Research Center | Ahad A.,Government of Pakistan | Tabassum A.,University of Punjab | And 2 more authors.
Pakistan Journal of Scientific and Industrial Research Series A: Physical Sciences | Year: 2016

A bench-scale beneficiation study was performed on low-grade complex lead-zinc ore of Duddar area, District Lasbela, Balochistan Province, Pakistan. The polymetallic ore under investigation contains galena and sphalerite as valuable minerals of lead and zinc. The low-grade ore was upgraded by selective sequential froth flotation technology to recover both minerals. An effort was made to investigate the effect of important variables on grade and recovery of concentrates and to design the process flow sheet. Different parameters of flotation process such as particle size of the feed, pH and % solids of the pulp, speed of impeller, type of reagents (collectors, frothers, regulators and modifiers) and their quantities, conditioning time and flotation time were optimized to attain maximum grade and recovery of respective concentrates. The rougher concentrates obtained were subjected to one regrinding and two cleaning operations to achieve higher-grade concentrates of both metals. Bench-scale flotation tests show that it is possible to obtain a lead concentrate assaying 65.24% Pb with recovery rate of 81.32% and a zinc concentrate containing 55.63% Zn content with recovery rate of 80.28%. Both the concentrates meet the specifications required for metallurgical and chemical grades. © 2016, PCSIR-Scientific Information Centre. All rights reserved.


Ata S.,University of Punjab | Tabassum A.,University of Punjab | Din M.I.,University of Punjab | Fatima M.,University of Punjab | And 4 more authors.
Digest Journal of Nanomaterials and Biostructures | Year: 2016

A novel sonochemical route was reported for the manufacturing of nickel oxide (NiO) nanoparticles. The synthesized NiO nanoparticles were characterized by UV-visible spectroscopy, Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and energy dispersive X-Ray analysis (EDX). Their size calculated by SEM was ranges between 35 to 117 nm. The ability of NiO nanoparticles to remove lead ions from aqueous solutions was investigated. Several parameters such as dosage of the adsorbent, pH, shaking time and the effect of temperature were studied systematically and optimum values were chosen for subsequent isotherm modeling. Adsorption data obeyed both Langmuir and Freundlich isotherm models but fitted better with Langmuir isotherm model with highest uptake capacity of 166 mg/g. The kinetics of the adsorption process followed pseudo-second-order rate equation. Thermodynamics studies illustrated endothermic nature of the process and its feasibility. The experimental results depicted that the NiO nanoparticles can likely be employed as an adsorbent for removing heavy metal ions from water. © 2016, Inst Materials Physics. All rights reserved.

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