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Influence and mechanism of Indonesia vanadium titano-magnetite on metallurgical properties of iron ore sinter
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作者 GAO Qiang-jian WEI Guo +4 位作者 SHEN Yan-song JIANG Xin ZHENG Hai-yan SHEN Feng-man LIU Chang-sheng 《Journal of Central South University》 SCIE EI CAS CSCD 2017年第12期2805-2812,共8页
In order to provide a reliable reference for utilizing Indonesia vanadium titano-magnetite(VTM) in blast furnace(BF) economically, metallurgical properties of iron ore sinter with addition of Indonesia VTM in mixed si... In order to provide a reliable reference for utilizing Indonesia vanadium titano-magnetite(VTM) in blast furnace(BF) economically, metallurgical properties of iron ore sinter with addition of Indonesia VTM in mixed sintering materials were investigated, including low-temperature reduction degradation index(RDI), reducibility index(RI), and softening/melting properties. Additionally, influenced mechanism of Indonesia VTM on metallurgical properties of sinter was studied. It is found that adding Indonesia VTM in sintering process quickly increases the RDI of sinters, and decreases the RI from 78.02% to 68.43%. Moreover, both beginning temperature(T_4) and final temperature(TD) of softening/melting increase gradually, and cohesive zone temperature range(T_D–T_4) enlarges from 219 oC to 315 oC. As a result, the permeability of cohesive zone gets worse, which is proven by the higher maximum pressure drop(δPmax) in softening/melting experiments. It is concluded that, after comprehensively considering all metallurgical properties mentioned above, the proper proportion of Indonesia VTM in sintering process is proposed in the new raw materials conditions. 展开更多
关键词 Indonesia vanadium titano-magnetite sinter reduction degradation INDEX REDUCIBILITY INDEX SOFTENING and MELTING properties
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Thermodynamic studies on gas-based reduction of vanadium titano-magnetite pellets 被引量:11
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作者 Jun-wei Chen Yang Jiao Xi-dong Wang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2019年第7期822-830,共9页
Numerous studies have focused on the reduction thermodynamics of ordinary iron ore;by contrast, the literature contains few thermodynamic studies on the gas-based reduction of vanadium titano-magnetite (VTM) in mixed ... Numerous studies have focused on the reduction thermodynamics of ordinary iron ore;by contrast, the literature contains few thermodynamic studies on the gas-based reduction of vanadium titano-magnetite (VTM) in mixed atmospheres of H2, CO, H2O, CO2, and N2. In this paper, thermodynamic studies on the reduction of oxidized VTM pellets were systematically conducted in an atmosphere of a C–H–O system as a reducing agent. The results indicate that VTM of an equivalent valence state is more difficult to reduce than ordinary iron ore. A reduction equilibrium diagram using the C–H–O system as a reducing agent was obtained;it clearly describes the reduction process. Experiments were performed to investigate the effects of the reduction temperature, the gas composition, and two types of iron ores on the reduction of oxidized VTM pellets. The results show that the final reduction degree increases with increasing reduction temperature, increasing molar ratio of H2/(H2 + CO), and decreasing H2O, CO2, and N2 contents. In addition, the reduction processes under various conditions are discussed. All of the results of the reduction experiments are consistent with those of theoretical thermodynamic analysis. This study is expected to provide valuable thermodynamic theory on the industrial applications of VTM. 展开更多
关键词 vanadium titano-magnetite gas-based REDUCTION C-H-O system thermodynamics
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Influence of microwave treatment on grinding and dissociation characteristics of vanadium titano-magnetite 被引量:4
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作者 Jun-peng Wang Tao Jiang +1 位作者 Ya-jing Liu Xiang-xin Xue 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2019年第2期160-167,共8页
The effect of microwave treatment on the grinding and dissociation characteristics of vanadium titano-magnetite(VTM) ore were investigated using scanning electron microscopy(SEM), nitrogen absorption measurements, par... The effect of microwave treatment on the grinding and dissociation characteristics of vanadium titano-magnetite(VTM) ore were investigated using scanning electron microscopy(SEM), nitrogen absorption measurements, particle size distribution measurements, X-ray diffraction(XRD) analysis, Fourier transform infrared(FT-IR) spectroscopic analysis, and magnetic separation. SEM analysis showed that microfractures appeared in the microwave-treated VTM, which is attributed to the microwaves' selective heating characteristic and the differential expansion between minerals and gangues. Nitrogen absorption showed that the microfractures were more pronounced when the microwave heating time was increased. Particle size distribution analysis showed that microwave treatment could improve the grindability of the VTM, thus increasing the weight percent of the fine-ground product. The increase in grindability was more significant with prolonged heating time. Moreover, the particle size distribution of the fine-ground product changed only slightly after the microwave treatment. XRD analysis showed that the crystallinity of the microwave-treated VTM increased with increasing microwave heating time. The magnetic separation tests revealed that the separation efficiency increased as a result of the intergranular fractures generated by microwave treatment. The Fe grade of the magnetic fraction of microwave-treated VTM was 1.72% higher than that of the raw ore. We concluded that the microwave treatment was beneficial, especially for the mineral processing characteristics. 展开更多
关键词 MICROWAVE treatment vanadium titano-magnetite GRINDING microstructure magnetic SEPARATION
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Sintering behaviors and consolidation mechanism of high-chromium vanadium and titanium magnetite fines 被引量:6
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作者 Mi Zhou Tao Jiang +1 位作者 Song-tao Yang Xiang-xin Xue 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2015年第9期917-925,共9页
To achieve high efficiency utilization of high-chromium vanadium-titanium magnetite (V-Ti-Cr) fines, an investigation of V Ti42r fines was conducted using a sinter pot. The chemical composition, particle parameters,... To achieve high efficiency utilization of high-chromium vanadium-titanium magnetite (V-Ti-Cr) fines, an investigation of V Ti42r fines was conducted using a sinter pot. The chemical composition, particle parameters, and granulation of V-Ti-Cr mixtures were analyzed, and the effects of sintering parameters on the sintering behaviors were investigated. The results indicated that the optimum quicklime dosage, mixture moisture, wetting time, and granulation time for V-Ti-Cr fines are 5wt%, 7.5wt%, 10 min, and 5-8 min, respectively. Meanwhile, the vertical sintering speed, yield, tumbler strength, and productivity gains were shown to be 21.28 mm/min, 60.50wt% , 58.26wt%, and 1.36 t·m^-2·h^-1, respectively. Furthermore, the consolidation mechanism of V-Ti-Cr fines was clarified, revealing that the consolidation of a V-Ti-Cr sinter requires an approximately 14vo1% calcium ferrite liquid-state, an approximately 15vo1% silicate liq- uid-state, a solid-state reaction, and the recrystallization of magnetite. Compared to an ordinary sinter, calcium ferrite content in a V-Ti-Cr sinter is lower, while the perovskite content is higher, possibly resulting in unsatisfactory sinter outcomes. 展开更多
关键词 MAGNETITE CHROMIUM vanadium titanium ore sintering CONSOLIDATION mineralogy
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Reduction behavior and kinetics of vanadium–titanium sinters under high potential oxygen enriched pulverized coal injection 被引量:1
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作者 Jin-fang Ma Guang-wei Wang +4 位作者 Jian-liang Zhang Xin-yu Li Zheng-jian Liu Ke-xin Jiao Jian Guo 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2017年第5期493-503,共11页
In this work, the reduction behavior of vanadium–titanium sinters was studied under five different sets of conditions of pulverized coal injection with oxygen enrichment. The modified random pore model was establishe... In this work, the reduction behavior of vanadium–titanium sinters was studied under five different sets of conditions of pulverized coal injection with oxygen enrichment. The modified random pore model was established to analyze the reduction kinetics. The results show that the reduction rate of sinters was accelerated by an increase of CO and H2contents. Meanwhile, with the increase in CO and H2contents, the increasing range of the medium reduction index (MRE) of sinters decreased. The increasing oxygen enrichment ratio played a diminishing role in improving the reduction behavior of the sinters. The reducing process kinetic parameters were solved using the modified random role model. The results indicated that, with increasing oxygen enrichment, the contents of CO and H2in the reducing gas increased. The reduction activation energy of the sinters decreased to between 20.4 and 23.2 kJ/mol. © 2017, The Author(s). 展开更多
关键词 Activation energy COAL Injection (oil wells) Kinetic parameters KINETICS OXYGEN Pulverized fuel sinterING TITANIUM vanadium
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Influence of Coke Content on Sintering Process of Chromium-containing Vanadium-titanium Magnetite 被引量:1
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作者 周密 杨松陶 +1 位作者 JIANG Tao XUE Xiangxin 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2018年第1期68-72,共5页
The sintering of chromium-containing vanadium-titanium magnetite using different coke contents was studied through the sintering pot tests, X-ray diffraction analysis and mineralogical phase analysis. Results showed t... The sintering of chromium-containing vanadium-titanium magnetite using different coke contents was studied through the sintering pot tests, X-ray diffraction analysis and mineralogical phase analysis. Results showed that, as the coke content increased from 3.2% to 4.4%, the liquid phase and combustion zone thickness increased while the vertical sintering rate and ratio of sintered product decreased. In addition, the combustion ratio of exhaust gas also increased with increasing the coke content, indicating that combustion zone temperature also increased, and the excessive the coke content in the sintering process of vanadiumtitanium magnetite is harmful. As the coke content increased, the magnetite, silicates, and perovskite contents of the sintered ore increased while the contents of hematite and calcium ferrite of sintered ore decreased; drum strength decreased, and reduction degradation properties increased while reduction ability decreased. We found that the appropriate coke content for the sintering process is 3.6 wt%. 展开更多
关键词 chromium-containing vanadium-titanium magnetite sintered ore coke content mineralogical phases
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Infiltration behavior of sintering liquid on nuclei ores during low-titanium ore sintering process 被引量:3
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作者 Dong-hui Liu Jian-liang Zhang +3 位作者 Xun Xue Guang-wei Wang Ke-jiang Li Zheng-jian Liu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2016年第6期618-626,共9页
Sinter strength is dependent not only on the self-intensity of the residual rude and bonding phase but also on the bonding degree between them. The infiltration behavior of sintering liquid on nuclei ores influences t... Sinter strength is dependent not only on the self-intensity of the residual rude and bonding phase but also on the bonding degree between them. The infiltration behavior of sintering liquid on nuclei ores influences the bonding degree, which ultimately determines the sinter strength. Infiltration tests were conducted using micro-sinter equipment. The infiltration area index of original liquid(IAO), infiltration volume index of secondary liquid(IVS), and sinter body bonding strength(SBS) were proposed to study the melt infiltration behavior. The results show that the IVS first increases and then decreases with increasing TiO2 content in adhering fines, whereas the IAO exhibits the opposite behavior. Compared with the original liquid, the secondary liquid shows lower porosity, smaller pores, and more uniform distribution. The SBS increases first and then decreases with increasing IAO and TiO2 content, and reaches a maximum when the IAO and TiO2 contents are approximately 0.5 and 2.0wt%, respectively. The SBS first increases and then tends to be stable with increasing IVS. The TiO2 content is suggested to be controlled to approximately 2.0wt% in low-titanium ore sintering. 展开更多
关键词 titanomagnetite vanadium ore treatment ore sintering infiltration
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Amelioration of the mineral compositions and microstructures of the special ore sinters 被引量:1
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作者 FU Ju ying, WANG Li guang (Department of Mineral Engineering, Central South University, Changsha 410083, China) 《Journal of Central South University of Technology》 2001年第1期29-33,共5页
Mineral compositions and microstructures of fluorine bearing magnetite concentrate and vanadium titanomagnetite concentrate are studied. The results show that a boride and a catalytic oxidation agent have great effect... Mineral compositions and microstructures of fluorine bearing magnetite concentrate and vanadium titanomagnetite concentrate are studied. The results show that a boride and a catalytic oxidation agent have great effects on ameliorating the mineral compositions and microstructures of these sinters, and the catalytic agent is more effective. Comparing these two kinds of ores, the performance of fluorine bearing magnetite concentrate is better. Addition of 0.01% catalyst into fluorine bearing magnetite concentrate can increase calcium ferrite content from 15% 20% up to 34% 39%, and its microstructure changes from large cavities and thin framework into intermediate cavities and thick framework, and the microcracks disappear. 展开更多
关键词 calcium ferrite catalyst vanadium titanomagnetite concentrate fluorine bearing magnetite concentrate sinter
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烧结熔剂对钒钛磁铁矿液相高温行为的影响
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作者 刘东辉 薛逊 +1 位作者 张建良 王晓哲 《材料与冶金学报》 CAS 北大核心 2024年第3期205-210,共6页
为了改善钒钛磁铁矿的烧结液相行为,采用微型烧结方法研究了不同熔剂对钒钛磁铁矿液相高温行为的影响.结果表明:从钒钛磁铁矿的液相高温行为考虑,白云石适合做低钛型钒钛矿的烧结熔剂,石灰石适合做低钛型或中钛型钒钛矿的烧结熔剂;与高... 为了改善钒钛磁铁矿的烧结液相行为,采用微型烧结方法研究了不同熔剂对钒钛磁铁矿液相高温行为的影响.结果表明:从钒钛磁铁矿的液相高温行为考虑,白云石适合做低钛型钒钛矿的烧结熔剂,石灰石适合做低钛型或中钛型钒钛矿的烧结熔剂;与高钛型钒钛矿相匹配的熔剂为高活性的生石灰,菱镁石并不适合做钒钛矿的烧结熔剂.因此,优化钒钛磁铁矿的液相高温行为应根据矿石中的钛含量,调节烧结熔剂中石灰石和高活性生石灰的配比,以及不同性能石灰石和高活性生石灰的使用量. 展开更多
关键词 熔剂 钒钛磁铁矿 烧结液相 高温行为
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钒钛矿烧结生产的研究进展
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作者 邢汉威 姜鑫 +4 位作者 张付林 纪恒 靳亚涛 隋孝利 沈峰满 《烧结球团》 北大核心 2024年第3期1-9,共9页
本文归纳了钒钛矿的烧结特点,分析了钒钛烧结矿强度差、低温还原粉化现象严重的主要原因,介绍了增加铁酸钙黏结相量、控制燃料配比、控制烧结温度、配加褐铁矿、强化制粒、复合造块及烧结矿表面喷洒CaCl_(2)/B_(2)O_(3)溶液等能够改善... 本文归纳了钒钛矿的烧结特点,分析了钒钛烧结矿强度差、低温还原粉化现象严重的主要原因,介绍了增加铁酸钙黏结相量、控制燃料配比、控制烧结温度、配加褐铁矿、强化制粒、复合造块及烧结矿表面喷洒CaCl_(2)/B_(2)O_(3)溶液等能够改善钒钛矿烧结指标的技术措施,展望了钢铁企业钒钛矿强化烧结面临的问题及解决方案。 展开更多
关键词 钒钛烧结矿 钙钛矿 褐铁矿 含硼矿物 转鼓强度
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铝土矿尾矿协同钒钛磁铁矿尾矿制备刚玉质复相陶瓷
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作者 陈靖龙 郎增瑞 +5 位作者 杨帆 陈新义 闵鑫 房明浩 黄朝晖 黄妃慧 《矿产保护与利用》 2024年第2期99-105,共7页
以铝土矿尾矿和钒钛磁铁矿尾矿为原料,经混料、成型和高温烧成等工艺制备了刚玉质复相陶瓷,研究了钒钛磁铁矿尾矿添加量、烧成温度等因素对制得复相陶瓷材料的物相、显微形貌及力学性能的影响规律。结果表明:当铝土矿尾矿与钒钛磁铁矿... 以铝土矿尾矿和钒钛磁铁矿尾矿为原料,经混料、成型和高温烧成等工艺制备了刚玉质复相陶瓷,研究了钒钛磁铁矿尾矿添加量、烧成温度等因素对制得复相陶瓷材料的物相、显微形貌及力学性能的影响规律。结果表明:当铝土矿尾矿与钒钛磁铁矿尾矿质量比为9∶1时,在1100℃下保温3 h制得刚玉质复相陶瓷材料的性能最优,其体积密度为2.71 g/cm^(3),抗压强度为276.9 MPa,抗折强度为67.3 MPa。 展开更多
关键词 铝土矿尾矿 钒钛磁铁矿尾矿 烧成温度 力学性能 刚玉质复相陶瓷
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Reduction Kinetics of Vanadium Titano-Magnetite Carbon Composite Pellets Adding Catalysts Under High Temperature 被引量:9
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作者 ZHANG Jian-liang XING Xiang-dong +3 位作者 CAO Ming-ming JIAO Ke-xin WANG Chun-long REN Shan 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2013年第2期1-7,共7页
Experiments were carried out by adding CaF2 and NaF as catalysts in an Ar atmosphere to study the isothermal reduction kinetics of vanadium titano-magnetite carbon composite pellets under high temperature in the range... Experiments were carried out by adding CaF2 and NaF as catalysts in an Ar atmosphere to study the isothermal reduction kinetics of vanadium titano-magnetite carbon composite pellets under high temperature in the range from 1 473 to 1 673 K. The scanning electron microscope (SEM) was used to characterize the microstructure of product. By analyzing reduction mechanism, it was found that the rate controlling step was gas diffusion, and the activation energy was 178.39 kJ/mol without adding any catalysts. Adding CaF2 or NaF of 3% to vanadium titano-magnetite carbon composite pellets can decrease the apparent activation energy of reduction, and the decrease extent was 14.95 and 15.79 kJ/mol, respectively. In addition, temperature was an important factor influencing on reaction rate. 展开更多
关键词 carbon composite pellet reduction kinetic CATALYST vanadium titano-magnetite
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Influence of Coating MgO on Sticking and Functional Mechanism during Fluidized Bed Reduction of Vanadium Titano-magnetite 被引量:2
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作者 Lei GUO Jin-tao YU +3 位作者 Jing-kun TANG Yin-he LIN Zhan-cheng GUO Hui-qing TANG 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2015年第6期464-472,共9页
The vanadium titano-magnetite (VTM) iron ore fines of 110--150/xm in diameter were reduced in a trans- parent quartz fluidized bed by 70 %CO-30 % H2 (volume fraction) mixtures. MgO powders served as coating agent ... The vanadium titano-magnetite (VTM) iron ore fines of 110--150/xm in diameter were reduced in a trans- parent quartz fluidized bed by 70 %CO-30 % H2 (volume fraction) mixtures. MgO powders served as coating agent to solve sticking problem. Two coating methods were introduced in this experiment: high temperature injection method and briquetting→oxidizing roast→crushing method. According to the experimental results, the minimum effective coating amount of MgO was 0. 1 mass%. The metallization ratio (MR) of the product rose from around 58% to above 90% with the above treatments. To investigate the sticking mechanism of fine ore, the morphology evolution was in- vestigated. Instead of iron whiskers, an interlaced fibrous porous surface formed. The ulvospinel (2FeO : TiO2 ) in VTM is more difficult to be reduced than FeO according to thermodynamic calculation. XRD results showed that MgO diffused into Fe203 lattice before forming pleonaste (MgO · Fe2O3 ) during oxidizing roast at 1273 K. The melting point of the pleonaste is 1986 K and that made contribution to prevent the sticking problem. 展开更多
关键词 fluidized bed STICKING oxide coating iron ore fine vanadium titano-magnetite
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酒钢3^(#)烧结机钒钛烧结矿生产实践
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作者 保善山 王忠有 申振国 《矿业工程》 CAS 2024年第5期57-61,67,共6页
酒钢地处我国西北部,周边高品位铁矿的有效利用对企业的发展至关重要。通过在酒钢3#烧结机进行钒钛烧结矿生产工业试验,证明了酒钢钒钛烧结矿生产是完全可行的。通过工业试验生产结果表明:随着钒钛磁铁矿配比的增加,烧结料层变薄、机速... 酒钢地处我国西北部,周边高品位铁矿的有效利用对企业的发展至关重要。通过在酒钢3#烧结机进行钒钛烧结矿生产工业试验,证明了酒钢钒钛烧结矿生产是完全可行的。通过工业试验生产结果表明:随着钒钛磁铁矿配比的增加,烧结料层变薄、机速降低、垂直烧结速度变慢、混合料透气性变差、烟道负压上升、混合料制粒效果变差,且由于钙钛矿的存在,烧结矿强度、返矿率、低温还原粉化率、转鼓指数等指标呈现劣化趋势,但是烧结矿熔滴区间变窄,更有利于高炉冶炼,后续生产应优先考虑燃料配比5.2%,且烧结矿TiO_(2)含量低于1.5%控制。 展开更多
关键词 钒钛磁铁矿 钒钛烧结矿 烧结性能 钙钛矿 熔滴区间
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石煤提钒尾渣基钙长石烧结砖的烧结及重金属固化机理
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作者 李欣聪 户晶荣 郭鑫桥 《矿产综合利用》 CAS 2024年第5期153-160,共8页
这是一篇陶瓷及复合材料领域的论文。石煤提钒尾渣是一种危险的工业废弃物,综合利用石煤提钒尾渣具有重要的环保与经济意义。本研究以石煤提钒尾渣为主要原料制备了建筑用烧结砖,研究了烧成温度对样品结构和性能的影响规律,探究了Cu、V... 这是一篇陶瓷及复合材料领域的论文。石煤提钒尾渣是一种危险的工业废弃物,综合利用石煤提钒尾渣具有重要的环保与经济意义。本研究以石煤提钒尾渣为主要原料制备了建筑用烧结砖,研究了烧成温度对样品结构和性能的影响规律,探究了Cu、V和Zn重金属浸出活性的钝化机理。结果表明:烧成温度显著影响烧结砖的相组成、显微结构和性能。适当提高烧成温度不仅有助于石英与原料中的碱性物质反应,生成富硅液相,提高样品的致密度,而且促进了黄长石向钙长石转变及莫来石生成。这些晶相与玻璃相互胶结,赋予制品较高的致密度和抗压强度。此外,提高烧成温度增大了制品中Cu、V和Zn的残渣态含量,减小了制品的孔径与孔容积,从而实现了Cu、V和Zn的固化。采用烧成温度为1 200℃,保温时间为3 h的工艺制度,制备出的建筑用烧结砖的各项性能均满足《烧结普通砖》(GB/T 5101—2003)中Mu25等级的要求,且制品的Cu、V、Zn重金属浸出浓度均低于标准值。研究结果为石煤提钒尾渣的综合利用提供了新的思路。 展开更多
关键词 陶瓷及复合材料 石煤提钒尾渣 建筑用烧结砖 烧成 重金属离子浸出浓度
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Formation of Hearth Sediment during Vanadium Titano-magnetite Smelting in Blast Furnace No.7 of Chengde Iron and Steel Company
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作者 Xiao-jie LIU Qing Lü +3 位作者 Shu-jun CHEN Zhen-feng ZHANG Shu-hui ZHANG Yan-qin SUN 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2015年第11期1009-1014,共6页
The large quantity of sediment produced in the hearth during vanadium titano-magnetite smelting in a blast furnace(BF) affects the stability of the blast furnace operation. Testing and analysis of the sediment in th... The large quantity of sediment produced in the hearth during vanadium titano-magnetite smelting in a blast furnace(BF) affects the stability of the blast furnace operation. Testing and analysis of the sediment in the hearth of Chengde Iron and Steel Company?s BF No.7 revealed that it was mainly concentrated in the location below the tuyere and above the iron notch. Notably, some of the bonding material(sediment) consisted of greater than 50% pig iron, and the pig iron distributed in the slag was granular. It is proposed that a large quantity of Ti C and Ti(C,N) are deposited on the surface of the pig iron. These high melting point materials mix with iron drops, preventing the slag from flowing freely, thus leading to the formation of bonding materials. In addition, the viscosity and melting temperature of the slag in the tuyere areas fluctuate greatly, and thus the properties of the slag are unstable. Moreover, the slag contains large quantities of carbon, which results in the reduction of Ti O2. The resultant precipitation of Ti is followed by the formation of Ti C in the slag, which also leads to an increase in the viscosity of the slag and difficulty in achieving separation of the slag-iron. In fact, all of these factors interact with each other, and as a result, sediment is formed when the operating conditions in the hearth fluctuate. 展开更多
关键词 vanadium titano-magnetite hearth sediment slag pig iron Ti(N C)
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碱度对钒钛烧结矿显微结构的影响 被引量:23
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作者 韩秀丽 王海峰 +2 位作者 刘丽娜 姚明艳 王艳红 《钢铁钒钛》 CAS 北大核心 2009年第3期56-60,共5页
采用光学显微镜研究了碱度对钒钛烧结矿显微结构的影响。研究表明:碱度由2.1提高到2.5,烧结矿中钛磁铁矿、铁酸钙与硅酸二钙含量增加,钛赤铁矿与玻璃质含量降低;骸晶状赤铁矿与包边结构减少,显微结构由斑状向交织熔蚀结构过渡;相应的烧... 采用光学显微镜研究了碱度对钒钛烧结矿显微结构的影响。研究表明:碱度由2.1提高到2.5,烧结矿中钛磁铁矿、铁酸钙与硅酸二钙含量增加,钛赤铁矿与玻璃质含量降低;骸晶状赤铁矿与包边结构减少,显微结构由斑状向交织熔蚀结构过渡;相应的烧结矿强度增加。碱度为2.5时,铁酸钙主要以柱状、针状形态存在,钛磁铁矿主要以他形粒状形态存在,钙钛矿主要呈十字形和他形晶形态存在。 展开更多
关键词 烧结 钒钛磁铁矿 碱度 显微结构 烧结矿强度 铁酸钙 钙钛矿
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高铬型钒钛磁铁矿烧结试验 被引量:13
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作者 张勇 周密 +1 位作者 储满生 薛向欣 《东北大学学报(自然科学版)》 EI CAS CSCD 北大核心 2013年第3期383-387,共5页
在高铬型钒钛磁铁矿基础特性研究的基础上,进行了配矿优化和烧结杯试验,并对烧结产物进行显微分析.结果表明,该矿烧结基本特性差,随着配比的提高,垂直烧结速度和产品转鼓指数下降,成品率和利用系数先升后降.另外,显微结构分析表明,高铬... 在高铬型钒钛磁铁矿基础特性研究的基础上,进行了配矿优化和烧结杯试验,并对烧结产物进行显微分析.结果表明,该矿烧结基本特性差,随着配比的提高,垂直烧结速度和产品转鼓指数下降,成品率和利用系数先升后降.另外,显微结构分析表明,高铬型钒钛烧结矿矿物组成主要有磁铁矿、赤铁矿、钙钛矿、铁酸钙、硅酸二钙和玻璃质.随着该矿配比的提高,烧结矿中铁酸钙、硅酸二钙含量降低,钙钛矿及玻璃相含量增加,液相量不足.因此,在实际生产中,该矿配比宜控制在10%~20%之间. 展开更多
关键词 高铬型钒钛磁铁矿 烧结基础特性 优化配矿 矿相 烧结矿
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亚甲基蓝-高碘酸钾系统催化动力学光度法测定痕量钒(V) 被引量:9
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作者 王洪福 苏智先 +2 位作者 张素兰 陈德 黄萍 《冶金分析》 CAS CSCD 北大核心 2010年第4期54-57,共4页
在硫酸介质中,活化剂柠檬酸存在时,于90℃的加热条件下,痕量钒(V)灵敏地催化高碘酸钾氧化亚甲基蓝褪色的指示反应。探讨了最佳实验条件,测定了动力学参数,建立了测定痕量钒(V)的新光度分析方法。研究发现,非催化反应吸光度(A0)与... 在硫酸介质中,活化剂柠檬酸存在时,于90℃的加热条件下,痕量钒(V)灵敏地催化高碘酸钾氧化亚甲基蓝褪色的指示反应。探讨了最佳实验条件,测定了动力学参数,建立了测定痕量钒(V)的新光度分析方法。研究发现,非催化反应吸光度(A0)与催化反应吸光度(A)在659 nm处的差值ΔA与钒(V)的质量浓度ρ在0.004~0.06μg/mL范围内呈良好的线性关系,检出限为1.78×10-10g/mL。该催化反应为准一级反应,反应的表观速率常数为9.03×10-4/s,表观活化能为60.92 kJ/mol。方法用于炼钢烧结矿样品中痕量钒(V)的测定,其回收率在101%~102%的范围,符合痕量分析的要求。 展开更多
关键词 催化动力学光度法 高碘酸钾 亚甲基蓝 钒(V) 烧结矿
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锂钒氧化物的合成及电化学性能的表征 被引量:12
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作者 张华香 童庆松 +1 位作者 林素英 陈前火 《无机盐工业》 CAS 2004年第3期26-28,共3页
在480℃、580℃和680℃下,分别烧结LiOH·H2O和NH4VO3的均匀混合物制得3种Li1.4V3O8样品。采用XRD、FTIR、循环伏安和充放电实验测试样品的结构和电化学性能之间的关系。XRD和FTIR的分析结果表明,合成的样品具有典型的Li1+xV3O8结... 在480℃、580℃和680℃下,分别烧结LiOH·H2O和NH4VO3的均匀混合物制得3种Li1.4V3O8样品。采用XRD、FTIR、循环伏安和充放电实验测试样品的结构和电化学性能之间的关系。XRD和FTIR的分析结果表明,合成的样品具有典型的Li1+xV3O8结构。充放电和循环伏安实验表明,480℃的样品可以达到500mA·h/g以上的高比容量,有一定的可充性。 展开更多
关键词 锂钒氧化物 合成 电化学性能 表征 烧结 锂离子电池 XRD FTIR
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