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- 저자 : Akbar Mehdilo (검색결과 1 건)
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Akbar Mehdilo,Mehdi Irannajad 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.33 No.-
The effect of microwave irradiation and oxidation roasting (as a conventional heating method) onilmenite surface properties and its flotation behavior were compared. This comparison was performedby carrying out micro and laboratory scales flotation tests, XPS, XRD, FTIR, SEM and microprobe analyses,zeta potential and contact angle measurements. The micro scale flotation experiments indicated that theilmenite flotation recovery improves from 73.5% to almost 94% and 91% after pretreatment bymicrowave irradiation and oxidation roasting, respectively. This is in good concordance with the resultsof XPS analysis showing the increase of Fe3+ content from 48.5% to 66% after pretreatment by microwaveirradiation and 64.8% after oxidation roasting. As evidenced by FTIR analysis, zeta potential and contactangle measurements, the improvement in ilmenite floatability and hydrophobicity after pretreatment isdue to the entrance of more oleate ions into the Helmholtz layer and the increase of the formation offerric iron oleate which is more insoluble than the ferrous one. The surface properties and floatability ofquartz does not change significantly after pretreatment by both methods. In ore flotation experiments, when the grinded ore was pretreated by microwave irradiation andoxidation roasting, without significant changes in the TiO2 grade of flotation concentrate, the recovery ofTiO2 improves from 65.4 to 76.2% and 73.7%, respectively. In the case of non-grinded ore, the recovery ofTiO2 increases up to 79.8% and 70.2% after microwave irradiation and oxidation roasting, respectively. The decrease of iron content in the gangue minerals increases the improvement of TiO2 grade andrecovery after pretreatment by both methods. Using microwave irradiation as a pretreatment process,the improvement in the recovery of TiO2 and separation efficiency is more than those of oxidationroasting. In addition, microwave irradiation reduces the consumption of activation and depressantagents.
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