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Thermal expansivity of geikielite and ilmenite utilizing in-situ synchrotron X-ray diffraction at high temperature
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作者 Jiamei Song Dawei Fan +4 位作者 Shijie Huang Shanrong Zhang Mengzeng Wu Wei Chen Wenge Zhou 《Acta Geochimica》 EI CAS CSCD 2023年第6期988-997,共10页
The unit-cell parameters and volumes of geikielite(MgTiO_(3))and ilmenite(FeTiO_(3))were investigated at high temperatures up to 700 K and ambient pressure,using in-situ angle-dispersive synchrotron X-ray diffraction.... The unit-cell parameters and volumes of geikielite(MgTiO_(3))and ilmenite(FeTiO_(3))were investigated at high temperatures up to 700 K and ambient pressure,using in-situ angle-dispersive synchrotron X-ray diffraction.No phase transition was detected over the experimental temperature range.Using(Berman in J Petrol29:445-522,1988.10.1093/petrology/29.2.445)equations to fit the temperature-volume data,the volumetric thermal expansion coefficients at ambient conditions(α_(V0))of MgTiO_(3) and FeTiO_(3) were obtained as follows:2.55(6)×10^(-5)K^(-1)and 2.82(10)×10^(-5)K^(-1),respectively.We infer that the larger effective ionic radius of Fe^(2+)(Ⅵ)(0.78 A)than that of Mg^(2+)(Ⅵ)(0.72?)renders FeTiO_(3)has a larger volumetric thermal expansivity than MgTiO_(3).Simultaneously,the refined axial thermal expansion coefficients under ambient conditions areα_(a0)=0.74(3)×10^(-5)K^(-1)andα_(c0)=1.08(5)×10^(-5)K^(-1)for the aaxis and c-axis of MgTiO_(3),respectively,andα_(a0)=0.95(5)×10^(-5)K^(-1)andα_(c0)=0.92(12)×10^(-5)K^(-1)for the aaxis and c-axis of FeTiO_(3),respectively.The axial thermal expansivity of MgTiO_(3) is anisotropic,but that of FeTiO_(3) is nearly isotropic.We infer that the main reason for the different axial thermal expansivity between MgTiO_(3) and FeTiO_(3) is that the thermal expansion mode of the Mg-O bond in MgTiO_(3) is different from that of the Fe-O bonds in FeTiO_(3). 展开更多
关键词 Geikielite ilmenite Thermal expansion Synchrotron X-ray diffraction High temperature
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Effect of surface dissolution on flotation separation of fine ilmenite from titanaugite 被引量:19
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作者 朱阳戈 张国范 +2 位作者 冯其明 鄢代翠 王维清 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第5期1149-1154,共6页
The influence of surface dissolution on flotation separation of fine ilmenite from titanaugite was investigated through infrared spectroscopic (FT-IR) analysis and X-ray photoelectron spectroscopy (XPS) test. The ... The influence of surface dissolution on flotation separation of fine ilmenite from titanaugite was investigated through infrared spectroscopic (FT-IR) analysis and X-ray photoelectron spectroscopy (XPS) test. The results show that surface dissolution in weak acid solution is helpful to enlarge the floatability difference between ilmenite and titanaugite. In weak acidic solution, as sodium oleate mainly interacts with Fe which results in ilmenite flotation, and surface dissolution is beneficial to its oxidation, the floatability of ilmenite after surface dissolution is increased; meanwhile, sodium oleate interacts with Ca and Mg which results in titanangite flotation, and the quantities of Ca and Mg on the surface of titanautite are decreased due to the surface dissolution, so the floatability of titanaugite after surface dissolution is depressed. For an ilmenite ore obtained from Panzhihua with TiO2 grade of 8.41%, flotation after surface dissolution treatment could increase TiO2 grade of rough concentrate from 26.7% to 31.73 %. 展开更多
关键词 ilmenite titanaugite FLOTATION surface dissolution
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Microwave drying characteristics and kinetics of ilmenite 被引量:16
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作者 李雨 雷鹰 +2 位作者 张利波 彭金辉 李长龙 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第1期202-207,共6页
The microwave drying of ilmenite was investigated.The effects of power levels and sample mass on drying characteristics of moisture content,drying rate,moisture ratio were studied,with microwave power ranging from 119... The microwave drying of ilmenite was investigated.The effects of power levels and sample mass on drying characteristics of moisture content,drying rate,moisture ratio were studied,with microwave power ranging from 119 W to 700 W and sample mass from 5 g to 25 g.The drying processes were completed within 2-8 min at different conditions.The moisture content and drying rates are found to be dramatically affected by microwave power density.For all drying processes the prior microwave absorption of moisture produces an accelerating peak on the drying rate curves in the initial stage.For the sample mass of 25 g and power of 385 W,the drying kinetics were studied.The experimental results fit better to the Henderson-Pabis index model rather than the Page's semi-empirical model;the drying rate constant k is increased with the increase of microwave power and decrease of sample mass. 展开更多
关键词 ilmenite microwave drying moisture content drying rate moisture ratio KINETICS
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Microwave assisted grinding of ilmenite ore 被引量:11
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作者 郭胜惠 陈菓 +3 位作者 彭金辉 陈晋 李东波 刘利军 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第9期2122-2126,共5页
The influence of microwave heating on the grinding of Panzhihua ilmenite ore was investigated. Factors that influence the processing are: the microwave exposure time, power density and sample mass. 40 g sample was mi... The influence of microwave heating on the grinding of Panzhihua ilmenite ore was investigated. Factors that influence the processing are: the microwave exposure time, power density and sample mass. 40 g sample was microwave heated for 30 s with 1 kW of microwave power and followed by water quenching. SEM analysis indicated that intergranular fractures occurred between ores and gangues other than transgranular fractures after microwave treatment, which would liberate minerals from each other effectively. The subsequently magnetic separation trials provided evidence that the recovery rate increased from 44% for raw ore to 72% by microwave treatment. 展开更多
关键词 MICROWAVE ilmenite ore MAGNETITE GRINDING magnetic separation
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Effect of temperature on dielectric property and microwave heating behavior of low grade Panzhihua ilmenite ore 被引量:10
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作者 刘晨辉 张利波 +4 位作者 彭金辉 刘秉国 夏洪应 顾晓春 史谊峰 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第11期3462-3469,共8页
The permittivity of low grade Panzhuhua ilmenite ore at 2.45 GHz in the temperatures from 20 ℃ up to 100 ℃ was measured using the technology of open-ended coaxial sensor combined with theoretical computation. The re... The permittivity of low grade Panzhuhua ilmenite ore at 2.45 GHz in the temperatures from 20 ℃ up to 100 ℃ was measured using the technology of open-ended coaxial sensor combined with theoretical computation. The results show that both the real (ε′) and imaginary (ε′) part of complex permittivity (ε′-jε′) of the ilmenite significantly increase with temperature. The loss tangent (tanδ) is a quadratic function of temperature, and the penetration depth of ilmenite decreases with temperature increase from 20 ℃to 100 ℃ The increase of the sample temperature under microwave radiation displays a nonlinear relationship between the temperature (T) and microwave heating time (t). The positive feedback interaction between complex permittivity and sample temperature amplifies the interaction between ilmenite and the microwave radiation. The optimum dimensions for uniform heat deposition vary from 10 cm to 5 cm (about two power penetration depths) in a sample being irradiated from both sides in a 2.45 GHz microwave field when temperature increases from room temperature to 100 ℃ 展开更多
关键词 dielectric properties Panzhihua ilmenite low grade microwave heating temperature increase
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Phase transitions, micro-morphology and its oxidation mechanism in oxidation of ilmenite (FeTiO_3) powder 被引量:5
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作者 肖玮 鲁雄刚 +2 位作者 邹星礼 危雪梅 丁伟中 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第8期2439-2445,共7页
Phase transitions, morphology changes, and oxidation mechanism of the ilmenite oxidation process were investigated. FeTi03 transforms to hematite and rutile when oxidation at 700-800 ℃, and pseudobrookite is formed w... Phase transitions, morphology changes, and oxidation mechanism of the ilmenite oxidation process were investigated. FeTi03 transforms to hematite and rutile when oxidation at 700-800 ℃, and pseudobrookite is formed when the oxidation temperature reaches 900 ℃. The initial ilmenite powder exhibits paramagnetism; however, after being oxidized at the intermediate temperature (800-850 ℃), the oxidation product exhibits weak ferromagnetism. The oxidation mechanism was discussed. The microstructure observations show that a lot of micro-pores emerge on the surfaces of ilmenite particles at the intermediate temperature, which is deemed to be caoable ofenhancin~ the mass transfer ofoxgen during oxidation. 展开更多
关键词 ilmenite phase transitions MICRO-MORPHOLOGY oxidation mechanism
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TiO_2 nanoparticles prepared by hydrochloric acid leaching of mechanically activated and carbothermic reduced ilmenite 被引量:4
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作者 陶涛 陈启元 +2 位作者 胡慧萍 尹周澜 陈英 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第5期1232-1238,共7页
A new combination method consisting of ball milling, carbothermic reduction and hydrochloric acid leaching was proposed for the preparation of nanosized synthetic rutile from natural ilmenite. The ball milling was emp... A new combination method consisting of ball milling, carbothermic reduction and hydrochloric acid leaching was proposed for the preparation of nanosized synthetic rutile from natural ilmenite. The ball milling was employed to grind ilmenite into small particles. The carbothermic reduction was carried out to yield a high titanium slag, which would be easily purified by subsequent leaching procedure. Factors affecting the hydrochloric acid process, namely the leaching time, temperature, and acid concentration, were studied. After leaching and calcining the milled and annealed mixture of FeTiO3/C under the optimal conditions, the TiO2 nanoparticles with size of 10-200 nm and purity〉98.0% were obtained. 展开更多
关键词 TiO2 ilmenite ball milling carbothermic reduction LEACHING NANOPARTICLES
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Effects of mechanical activation and oxidation-reduction on hydrochloric acid leaching of Panxi ilmenite concentration 被引量:6
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作者 谭平 胡慧萍 张黎 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第6期1414-1421,共8页
The effects of oxidation-reduction treatment and mechanical activation on the hydrochloric acid leaching performance of Panxi ilmenite concentration were investigated.The results show that both of oxidation-reduction ... The effects of oxidation-reduction treatment and mechanical activation on the hydrochloric acid leaching performance of Panxi ilmenite concentration were investigated.The results show that both of oxidation-reduction treatment and mechanical activation significantly accelerate the extraction of Fe,Ca and Mg from Panxi ilmenite concentration;however,the CaO and MgO contents of the calcined residues obtained from oxidized-reduced ilmenite concentration are higher than the standard values required by chlorination process.The Ca and Mg in oxidized-reduced ilmenite concentration can be leached much faster after mechanical activation,yielding a synthetic rutile which meets the requirements of chlorination process containing 90.50% TiO2 and 1.37% total iron as well as combined CaO and MgO of 1.00%.The optimum oxidation and reduction conditions are as follows:oxidization at 900 ℃ in the presence of oxygen for 15 min and reduction at 750 ℃ by hydrogen for 30 min. 展开更多
关键词 ilmenite concentration mechanical activation OXIDATION REDUCTION hydrochloric acid leaching
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Effect of milling time on carbothermic reduction of ilmenite 被引量:3
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作者 陈敏 汤爱涛 肖玄 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第12期4201-4206,共6页
A systematic investigation on the effect of milling time on carbothermic reduction of ilmenite was carried out by a combination of thermal analysis, X-ray diffraction(XRD), scanning electron microscopy(SEM) and pa... A systematic investigation on the effect of milling time on carbothermic reduction of ilmenite was carried out by a combination of thermal analysis, X-ray diffraction(XRD), scanning electron microscopy(SEM) and particle size analysis. It was shown that the graphite crystalline structure was easily destroyed along the(002) crystal plane during milling process. The particle size of ilmenite/graphite mixture was largely decreased and a fully mixed composite structure was obtained after milling for 4 h at high milling intensity. Milling exerts positive effect on the decreasing temperatures of ilmenite reduction and gradual deoxidizing of titanium oxides was completed. 展开更多
关键词 milling time carbothermic reduction ilmenite
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Reductive kinetics of Panzhihua ilmenite with hydrogen 被引量:4
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作者 Chang-yuan LU Xing-li ZOU +5 位作者 Xiong-gang LU Xue-liang XIE Kai ZHENG Wei XIAO Hong-wei CHENG Guang-shi LI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第12期3266-3273,共8页
The hydrogen reduction of Panzhihua ilmenite concentrate in the temperature range of 900?1050 °C was systematicallyinvestigated by thermogravimetric analysis (TG), X-ray diffraction (XRD) and scanning electron mi... The hydrogen reduction of Panzhihua ilmenite concentrate in the temperature range of 900?1050 °C was systematicallyinvestigated by thermogravimetric analysis (TG), X-ray diffraction (XRD) and scanning electron microscopy (SEM) methods. It wasshown that the products of the Panzhihua ilmenite reduced at 900 °C were metallic iron and rutile. Above 1000 °C, ferrouspseudobrookite solid solution was generated. During the reduction process, element Mg gradually concentrated to form Mg-rich zonewhich can influence the metallization process. The reduction reaction proceeded topochemically and its related reduction kineticswere also discussed. The kinetics of the reduction indicated that the rate-controlling step was the diffusion process. The apparentactivation energy of the hydrogen reduction of Panzhihua ilmenite was calculated to be 117.56 kJ/mol, which was larger than that ofsynthetic ilmenite under the same reduction condition. 展开更多
关键词 Panzhihua ilmenite synthetic ilmenite hydrogen reduction KINETICS rate-controlling step magnesium migration
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An in situ ATR-FTIR study of mixed collectors BHA/DDA adsorption in ilmenite-titanaugite flotation system 被引量:19
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作者 Liping Luo Houqin Wu +5 位作者 Longhua Xu Jinping Meng Jiahui Lu Huan Zhou Xiaomei Huo Lingyun Huang 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2021年第4期689-697,共9页
This paper researched the enhanced flotation separation performance of ilmenite and titanaugite using the mixed collector benzhydroxamic acid/dodecylamine(BHA/DDA).The interface assembly mechanism was mainly investiga... This paper researched the enhanced flotation separation performance of ilmenite and titanaugite using the mixed collector benzhydroxamic acid/dodecylamine(BHA/DDA).The interface assembly mechanism was mainly investigated through in situ attenuated total reflectance Fourier transform infrared(ATRFTIR)spectroscopy combined with the two-dimensional correlation spectroscopy(2D-COS)and X-ray photoelectron spectroscopy(XPS).It has been found that BHA/DDA mixed collectors successfully separate ilmenite from titanaugite at a molar ratio of 8:1.Zeta potential experiments suggested that,in the presence of mixed collector system,the BHA-DDA complex adsorbed on the ilmenite surface via the chemically adsorbed BHA and the electrostatically adsorbed DDA,however,the complex adsorbed on the surface of titanaugite unstably.According to in situ ATR-FTIR combined with 2D-COS and XPS results,the interface assembly mechanism of BHA/DDA is summarized as:the function group of BHA molecules first binds to the metal sites on minerals to form bidentate ligand,then DDA co-adsorbed with BHA on the surface of minerals through hydrogen bonding.DDA may change the adsorption modes of some BHA on the ilmenite surface from four-membered ring to five-membered ring,while the modes on the titanaugite surface is true opposite.Finally,recommended adsorption configurations of the BHA/DDA complex on the two mineral surfaces are proposed. 展开更多
关键词 ilmenite Titanaugite Mixed collector FLOTATION ADSORPTION
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Phase transformation and reduction kinetics during the hydrogen reduction of ilmenite concentrate 被引量:8
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作者 Xin-guo Si Xiong-gang Lu +2 位作者 Chuan-wei Li Chong-he Li Wei-zhong Ding 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2012年第5期384-390,共7页
The reduction of ilmenite concentrate by hydrogen gas was investigated in the temperature range of 500 to 1200℃. The microstructure and phase transition of the reduction products were studied by X-ray diffraction (... The reduction of ilmenite concentrate by hydrogen gas was investigated in the temperature range of 500 to 1200℃. The microstructure and phase transition of the reduction products were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), and optical microscopy (OM). It was found that the weight loss and iron metallization rate increased with the increase of reduction temperature and reaction time. The iron metallization rate could reach 87.5% when the sample was reduced at 1150℃ for 80 min. The final phase constituents mainly consist of Fe, M305 solid solution phase (M=Mg, Ti, and Fe), and few titanium oxide. Microstructure analysis shows that the surfaces of the reduction products have many holes and cracks and the reactions take place from the exterior of the grain to its interior. The kinetics of reduction indicates that the rate-controlling step is diffusion process control with the activation energy of 89 kJ.mo1-1. 展开更多
关键词 ilmenite phase transformations KINETICS HYDROGEN reduction METALLIZATION
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Mossbauer Spectrum Study on Hydrogen Reduction of Preoxidized Ilmenite 被引量:10
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作者 孙康 《Rare Metals》 SCIE EI CAS CSCD 1997年第1期60-63,共4页
Reduction behavior of preoxidized synthetic ilmenite was studied by means of Mossbauer spectra. In the course of reduction, iron component in the samples is reduced in stepwise: Fe 3+ →Fe 2+ →Fe 0, and some... Reduction behavior of preoxidized synthetic ilmenite was studied by means of Mossbauer spectra. In the course of reduction, iron component in the samples is reduced in stepwise: Fe 3+ →Fe 2+ →Fe 0, and some intermediate compounds, such as Fe 3O 4, Fe 2TiO 4 etc . and their solid solution may be generated besides Fe 2O 3 and FeTiO 3. If the reduction temperature is higher than 1173 K, the metallization needs only half time of the case when the temperature is lower than 1073 K. 展开更多
关键词 ilmenite REDUCTION Mossbauer effect Reaction sequence
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Beneficiation of Titanium Oxides From Ilmenite by Self-Reduction of Coal Bearing Pellets 被引量:7
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作者 XU Meng GUO Ming-wei ZHANG Jian-liang WAN Tian-ji KONG Ling-tan 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2006年第2期6-9,共4页
The study on the beneficiation of titanium oxides from Panzhihua ilmenites by reduction of coal bearing pellets was carried out. The iron oxides in pellets were efficiently reduced to metal iron, and titanium oxide sl... The study on the beneficiation of titanium oxides from Panzhihua ilmenites by reduction of coal bearing pellets was carried out. The iron oxides in pellets were efficiently reduced to metal iron, and titanium oxide slag beneficiated was separated from metal iron. The effect of temperature, flux and coal blending ratio on the reduction and separation was investigated, and rational parameters were determined. A new process for the beneficiation of titanium oxides by rotary hearth furnace (RHF) was proposed. 展开更多
关键词 ilmenite PYROMETALLURGY reduction separation titaniferous slag coal bearing pellet
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Reagent types and action mechanisms in ilmenite flotation:A review 被引量:7
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作者 Jiaozhong Cai Jiushuai Deng +5 位作者 Liang Wang Mingzhen Hu Hongxiang Xu Xiaoan Hou Bozeng Wu Shimei Li 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2022年第9期1656-1669,共14页
Ilmenite is an essential mineral for the extraction of titanium.Conventional physical separation methods have difficulty recovering fine ilmenite,and dressing plants have begun applying flotation to recover ilmenite.T... Ilmenite is an essential mineral for the extraction of titanium.Conventional physical separation methods have difficulty recovering fine ilmenite,and dressing plants have begun applying flotation to recover ilmenite.The interaction of reagent groups with Ti and Fe sites on the ilmenite surface dramatically influences the ilmenite flotation.However,the investigation on Fe sites has received more attention because the activity of Ti is lower than that of Fe.For the activators on ilmenite flotation,most are metal ions but typically lead ions.The metal ions of activators promote ilmenite flotation by increasing the active sites on the ilmenite surface.Combined reagents have a better selective separation of ilmenite than single reagents due to their synergistic effect.Combining the lead ion(Pb^(2+))and the benzyl hydroxamic acid(BHA)into a Pb-BHA complex has a marked effect on ilmenite flotation,which puts forward a new idea of developing combined reagents for ilmenite flotation.This review considers reagent types and action mechanisms in ilmenite flotation.On the basis of the analysis of previous research,a brief future outlook of reagent types and action mechanisms in ilmenite flotation is also proposed in this study. 展开更多
关键词 ilmenite FLOTATION REAGENT action mechanism combined reagents
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Removal of iron from ilmenite by KOH leaching-oxalate leaching method 被引量:5
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作者 WANG Yuanbo QI Tao +1 位作者 CHU Jinglong ZHAO Wei 《Rare Metals》 SCIE EI CAS CSCD 2010年第1期9-15,共7页
Oxalic acid was used for the removal of iron from the intermediates of ilmenite leached by KOH liquor. Various parameters, such as pH, temperature, initial oxalate concentration, and illumination were investigated. Me... Oxalic acid was used for the removal of iron from the intermediates of ilmenite leached by KOH liquor. Various parameters, such as pH, temperature, initial oxalate concentration, and illumination were investigated. Meanwhile, it was found that orthorhombic crystal Ti2O2(OH)2(C2O4)-H2O formed as the leaching proceeded. Scanning electronic microscope (SEM) images implied that the formation of Ti2O2(OH)2(C2O4).H2O with good crystallinity proceeded through three stages. Calcining Ti2O2(OH)2(C2O4)·H2O, anatase (350℃) or mtile (550℃) type TiO2 was obtained, respectively. Element analysis found that the calcined product contained 94.9% TiO2 and 2.5% iron oxide, but only about 1600 ppm dissolvable iron oxide was left, which indicates that oxalic acid was comparatively effective on iron oxide removal from the intermediates. Finally, an improved route was proposed for the upgrading of ilmenite into mtile. 展开更多
关键词 ilmenite iron removal titanium oxide OXALATE potassium hydroxide KOH leaching
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Comparison of wear behaviour of LM13 Al−Si alloy based composites reinforced with synthetic(B_(4)C)and natural(ilmenite)ceramic particles 被引量:5
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作者 Rahul GUPTA Tarun NANDA O.P.PANDEY 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第12期3613-3625,共13页
Dry sliding wear behaviour of stir-cast aluminium matrix composites(AMCs)containing LM13 alloy as matrix and ceramic particles as reinforcement was investigated.Two different ceramic particle reinforcements were used ... Dry sliding wear behaviour of stir-cast aluminium matrix composites(AMCs)containing LM13 alloy as matrix and ceramic particles as reinforcement was investigated.Two different ceramic particle reinforcements were used separately:synthetic ceramic particles(B_(4)C),and natural ceramic particles(ilmenite).Optical micrographs showed uniform dispersion of reinforced particles in the matrix material.Reinforced particles refined the grain size of eutectic silicon and changed its morphology to globular type.B_(4)C reinforced composites(BRCs)showed maximum improvement in hardness of AMCs.Ilmenite reinforced composites(IRCs)showed maximum reduction in coefficient of friction values due to strong matrix−reinforcement interfacial bonding caused by the formation of interfacial compounds.Dry sliding wear behaviour of composites was significantly improved as compared to base alloy.The low density and high hardness of B_(4)C particles resulted in high dislocation density around filler particles in BRCs.On the other hand,the low thermal conductivity of ilmenite particles resulted in early oxidation and formation of a tribo-layer on surface of IRCs.So,both types of reinforcements led to the improvement in wear properties of AMCs,though the mechanisms involved were very different.Thus,the low-cost ilmenite particles can be used as alternative fillers to the high-cost B_(4)C particles for processing of wear resistant composites. 展开更多
关键词 aluminium matrix composites ilmenite boron carbide PARTICLE-REINFORCEMENT wear test TRIBOLAYER XRD analysis SEM−EDS
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MICROWAVE-ASSISTED CARBOTHERMIC REDUCTION OF ILMENITE 被引量:8
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作者 HUA Yixin and LIU Chunpeng(Department of Metallurgy, Kunming University of Science and Technology, Kunming 650093, China) 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1996年第3期164-170,共7页
The microwave-assisted carbothermic reduction of ilmenite was investigated by thermogravimetric analysis under argon atmosphere. A comparison between microwave assisted reduction and the conventional one was made. It ... The microwave-assisted carbothermic reduction of ilmenite was investigated by thermogravimetric analysis under argon atmosphere. A comparison between microwave assisted reduction and the conventional one was made. It was demonstrated that the instantaneously volumetric heating of microwaves could significantly enhance the overall reduction process. By microwave application, the reduction could take place at much lower temperatures and the activation energy for the process could be lowered.The mechanism of the reduction was discussed according to the experimental data. 展开更多
关键词 MICROWAVE carbothermic reduction ilmenite
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Effect of Temperature on Carbothermic Reduction of Ilmenite 被引量:7
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作者 LIWen-bing YUANZhang-fu +2 位作者 XUCong PANYi-fang WANGXiao-qiang 《Journal of Iron and Steel Research International》 SCIE CAS CSCD 2005年第4期1-5,共5页
The reduction of ilmenite (FeTiO_3) has been studied extensively. Temperature for the carbothermic reduction of ilmenite ranges from 900 ℃ to 1 400 ℃, and the reduction degree of Panzhihua ilmenite increases with in... The reduction of ilmenite (FeTiO_3) has been studied extensively. Temperature for the carbothermic reduction of ilmenite ranges from 900 ℃ to 1 400 ℃, and the reduction degree of Panzhihua ilmenite increases with increasing temperature. X-ray diffraction analysis and SEM analysis were used to identify the phase before and after reduction, and to identify the morphology of reduced samples respectively. It is found that the reaction initiates at about 860 ℃. The reaction rate varies with temperature simultaneously. Impurities in Panzhihua ilmenite decrease the reduction degree. Magnesium and calcium oxide-rich zone is formed preventing complete reduction of Fe 2+. In general, the reaction products are iron, Ti_3O_5 and carbon. 展开更多
关键词 ilmenite carbothermic reduction IMPURITY
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Innovative pre-concentration technology for recovering ultrafine ilmenite using superconducting high gradient magnetic separator 被引量:5
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作者 Zhitao Yuan Xuan Zhao +2 位作者 Jiwei Lu Hong Lv Lixia Li 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2021年第6期1043-1052,共10页
To achieve the utilization of the abandoned ultrafine ilmenite(-20 μm) produced in the titanium magnetite processing plant in Panzhihua,the superconducting high-gradient magnetic separation(SMS) technology was propos... To achieve the utilization of the abandoned ultrafine ilmenite(-20 μm) produced in the titanium magnetite processing plant in Panzhihua,the superconducting high-gradient magnetic separation(SMS) technology was proposed in this study.After optimizing the conditions of magnetic intensity,feeding and pulsation,an SMS concentrate with TiO_(2) grade of 16.03% and TiO_(2) recovery of 66.39% was obtained through one roughing-one cleaning pre-concentration flowsheet.The specific magnetic force and magnetic force were calculated and analysed to illustrate the pre-concentration mechanism,and the results revealed that the combination of high magnetic field and strong pulsating resulted in the effective preconcentration of the ultrafine ilmenite in the SMS process.In addition,the magnetic force analysis indicated that the high magnetic intensity and high magnetic gradient are the key factors of the SMS technology.Furthermore,the EDS-Mapping detection certified that the ultrafine ilmenite was concentrated from the gangue minerals using SMS technology. 展开更多
关键词 Ultrafine ilmenite Superconducting high gradient magnetic separation PRE-CONCENTRATION EDS-Mapping
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