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Effects of the continuous cooling process conditions on the crystallization and liberation characteristics of anosovite in Ti-bearing titanomagnetite smelting slag

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International Journal of Minerals,Metallurgy and Materials 2019年第9期26卷 1120-1128页

作者： Zhen Wang Hao-yan Sun Qing-shan Zhu State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

This study involved the investigation of the effects of the continuous cooling process conditions on the crystallization and liberation characteristics of anosovite in Ti-bearing titanomagnetite smelting slag. The samples were heated until melting and then the temperature was held at 1650℃ for nearly 0.5 h;subsequently, the samples were cooled at different cooling rates to different temperatures and water-quenched after being held for different times at these temperatures. Last, the obtained crystallized samples were used to analyze the crystallization and liberation characteristics. It was found that, during the continuous cooling process, anosovite particles were found to initially precipitate in the slag at a relatively high crystallization temperature, showing the characteristics of euhedral crystal. The precipitation and growth of anosovite grain is strong and the morphology of anosovite was basically not affected by the continuous cooling conditions. From the morphology perspective, the formed anosovite is an excellent Ti-rich phase to be selective separated. The formation of spinel and diopside is negative for the liberation and selective separation of the anosovite phase. The crystallization diagrams of TiO2-MgO-CaO-SiO2-Al2O3-FeO slag undergoing different continuous cooling processes were constructed to help to determine the optimal continuous cooling–quenching condition for selective separation of anosovite. Moreover, the addition of B2O3 can enlarge the range of the optimal continuous cooling–quenching conditions for selective separation of anosovite.

关键词： titanium-bearing slag crystallization anosovite liberation titanomagnetite

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Flotation behavior and adsorption mechanism of salicylhydroxamic acid in artificial mineral anosovite

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Journal of Central South University 2019年第4期26卷 806-812页

作者： WANG Xue-feng WANG Yi-jie WEN Shu-ming YIN Peng-gang School of Chemistry and Environment Beijing University of Aeronautics and Astronautics Chinese Academy of Natural Resources Economics State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and Technology

Flotation is often employed to separate valuable natural minerals and gangue ***,few studies have been conducted on artificial mineral ***,the primary mineral in titanium slag,is a typical artificial mineral that can be enriched by *** the present work,flotation behavior and adsorption mechanism of anosovite in salicylhydroxamic acid(SHA)solution were *** influence of pH and SHA dosage on anosovite flotability was ***-flotation test results show that a pH range of 7–8.5 is available for SHA to collect anosovite.A maximum recovery of 93.26%can be obtained with SHA dosage of only 4×10.5 mol/*** addition,TOC,zeta potential,FTIR,SEM-EDS,and XPS analyses were used to study the adsorption *** demonstrated that SHA adsorption is governed by *** studies further suggested that chemical adsorption occurred at the Ti sites on the anosovite surface.

关键词： anosovite salicylhydroxamic acid flotation adsorption

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Mineral phase reconstruction behavior of direct reduction and smelting titanium slag at high temperature and slow cooling

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Rare Metals 2015年第6期34卷 440-444页

作者： Yi-Jie Wang Shu-Ming Wen Qi-Cheng Feng Zhi-Wen Ye Min Wang State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and Technology Faculty of Land Resource Engineering Kunming University of Science and Technology Advanced Analysis and Measurement Center Yunnan University

Titanium slag in this study was produced by subjecting titanomagnetite concentrate to direct reductionelectric furnace smelting. Processing mineralogy and mineral phase reconstruction behavior at high temperature and slow cooling treatment were examined by chemical analysis, X-ray diffraction （XRD）, optical microscopy （OM）, scanning electron microscopy （SEM）, and energydispersive spectroscopy （EDS）. anosovite solid solution is the main titanium product by the direct reduction and smelting process. Results of slow-cooling experiments show that crystal volume and size increase as cooling rate decreases. anosovite and gangue mineral crystals develop fully with large crystal volume and size at a cooling rate of 2 ***-1. Moreover, the growth of anosovite crystal was characterized by crystal nucleation and growth theory. These results provide further insights into the separation of anosovite from gangue by mineral processing.

关键词： Direct reduction Smelting titanium slag anosovite Slow cooling Crystal

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Effects of magnesium and cooling rate on titanium phase transformation for production of TiO_2

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Transactions of Nonferrous Metals Society of China 2016年第9期26卷 2518-2522页

作者：王伊杰文书明丰奇成刘建任伟成昆明理工大学省部共建复杂有色金属资源清洁利用国家重点实验室昆明650093 昆明理工大学国土资源工程学院昆明650093

X-ray diffraction（XRD） and crystal structure analysis were used to study the effects of Mg content and cooling rate on the titanium phase transformation of three types of titanium slag. The results indicate that in the rapid cooling process, the titanium phase is anosovite, whose chemical formula is MgnTi（3-n）O5（0n1）. In the slow cooling process, when the Mg content is high, anosovite transforms into karrooite MgTi2O5 structure; when the Mg content is low, karrooite MgTi2O5 and rutile TiO2 both exist. The stability of karrooite MgTi2O5 is better than that of anosovite MgnTi（3-n）O5. Slow cooling contributes to the doping of Mg into the anosovite crystal and stabilises the anosovite crystal structure.

关键词： anosovite karrooite rutile crystal structure stability

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