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Preparation and Structural Configuration of TiO2 Support and Its Co Catalyst

材料科学与工程（中英文B版） 2012年第2期2卷 167-173页

作者： Ayo Samuel Afolabi am.ali saka abdulkareem Department of Chemical Engineering University of South Africa

Three different loadings (10, 20 and 30%) of cobalt based catalyst samples supported on titania (TiO2) were prepared and their structural configurations were investigated using the thermogravimetry analysis (TGA) and BET. The analyses of the TGA results showed that a 3-stage weight loss was observed for the three loadings of the catalyst sam ples while the BET analyses revealed that the surface areas and pore volumes of the catalyst decreased with increase in Co loadings on the catalyst. The investigation of the structural changes of TiO2 coated with carbon, using chemical vapour deposition (CVD) method at different periods was also conducted. The BET analyses of the TiO2 coated with carbon showed that increasing the period spent by the TiO2 samples in CVD reactor increased the quantity of carbon coated on the TiO2 samples, which led to the reduction of their surface areas and the pore volumes.

关键词：钴基催化剂结构配置 TiO2 制备二氧化钛涂层合作化学气相沉积热重分析

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Effect of Flotation Parameters on Recovery of South Africa Nickel Sulphide Ore

Effect of Flotation Parameters on Recovery of South Africa N...

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2012 Asian Pacific Conference on Energy,Environment and Sustainable Development(APEESD 2012)

作者： Ayo Samuel Afolabi am.ali saka abdulkareem Edison Muzenda Department of Civil and Chemical Engineering College of Science Engineering and Technology University of South Africa Department of Chemical Engineering Faculty of Engineering and the Built Environment University of Johannesburg

This study investigated the effects of flotation parameters on the recovery of low grade nickel sulphide ore. The parameters investigated are the particle size, flotation time, temperature and pH of the pulp. The analyses of the results obtained showed that particle size, pH, and flotation time had significant effects on the recovery of nickel sulphide ore. The particle size distribution showed that the breakage rate increased in coarse particles and decreased with reduction in particle size. The optimum particle size was found to be 87% passing 75 μm with the highest nickel recovery of 35% at 15 minutes while 68, 79, and 97% passing 75 μm produced nickel recovery of 15, 20 and 16% respectively. The maximum nickel recovery of 35% was achieved at pH of 10.5 which indicated that the nickel sulphide ore has good floatability at alkaline pH range. It was also observed that the recovery of nickel increased with flotation time and the highest recovery was obtained at flotation time of 15 minutes.

关键词： Flotation Particle size Pentlandite PH Recovery Temperature Time

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