Journal of Sustainable Metallurgy
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2023
·Vol. 9
·期 3
·1303-1314
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IF 2.4
Lv Ningning,Qiu Yuchao,Hu Yiming,Shi Hangkai,Shi Junjie,Ding Xiang,Li Haolun
It has been proved that Cr 2 O 3 is favorable to promote the crystallization of perovskite in the Selective Crystallization and Phase Separation (SCPS) process. However, the related thermodynamic data of equilibrium phase relations was quite limited. In the present work, the equilibrium phase relations of CaO-SiO 2 -TiO 2 system with the addition of 5 wt% Cr 2 O 3 were experimentally carried out using the high temperature equilibration-quenching technique followed by X-Ray Diffraction (XRD), Scanning Electron Microscopy-Energy Dispersive X-Ray Spectroscopy (SEM–EDS), as well as thermodynamic calculation. More attention has been focused on the influence of 5 wt% Cr 2 O 3 addition on the liquid-perovskite two-phase coexisting region. The results indicated that the crystallization of perovskite was promoted by Cr 2 O 3 addition by expanding the primary phase of perovskite toward higher SiO 2 areas. Meanwhile, distinct discrepancies were found when the present experimental results were compared with the data from the literature and the isotherms calculated by FactSage, indicating that the present results are not only meaningful for the improvement of the SCPS process, but also important for the optimization of titania related oxide thermodynamic database. Graphical Abstract
研究领域:
冶金学
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材料科学
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DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
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2024
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IF 2.4
Chen Mao,Chen Buxin,Jiang Yang,Zheng Kui,Hu Meilong,Qiu Shuxing
Ti(C,N) is commonly observed in vanadium titanomagnetite blast furnaces and greatly affects the stable and smooth operation of the smelting processes. To get fundamental insight into Ti(C, N) formation, systematic experiments were conducted to investigate the effects of the composition of slags, temperatures, reaction time and reaction atmosphere on the formation of Ti(C,N) from TiO 2 -containing slags. The results show that TiN and TiC contents increase with TiO 2 content increases. When TiO 2 is larger than 30 wt pct, TiN contents increase dramatically. Control of basicity, MgO and Al 2 O 3 concentrations in the slag could help to reduce Ti(C,N) contents in slags. TiN and Ti(C,N) contents increase dramatically with the extension of time. TiN is more easily formed at high temperatures, and TiN contents increase with the increase of temperature. With the increase of N 2 contents, TiC contents are relatively stable, and TiN and Ti(C,N) contents increase almost linearly. H 2 would greatly promote the formation of TiC. This paper can provide a theoretical basis for minimizing the formation of Ti(C,N) in different blast furnace conditions.
研究领域:
冶金学
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材料科学
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产品关联
DOI
高影响因子
ISIJ INTERNATIONAL
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2024
·
IF 1.6
Zhongya Pang,Shun Chen,Zhenqiang Jiang,Chenyang Han,Xing Yu,Kai Zheng,Chaoyi Chen,Guangshi Li,Qian Xu,Xingli Zou,Xionggang Lu
Titanium-bearing blast furnace slag (TBFS), a byproduct of ironmaking processes, has long been discarded as waste, resulting in the squandering of valuable resources such as titanium. The recovery and effective utilization of TBFS hold immense significance and importance. This study reports a direct electrolysis method for synthesizing Ti5Si3 alloy from a TBFS/SiO2 mixture in molten CaCl2 at 950 °C. A comprehensive investigation was conducted into the phase and morphological evolution during the electrolysis process, along with an analysis of the migration behavior of impurities such as Ca and Al present in TBFS. The synthesized Ti5Si3 alloy powder was systematically characterized and analyzed using scanning electron microscopy, transmission electron microscopy, and other techniques. The results reveal that the electrolysis process encompasses electrochemical deoxidation, in-situ alloying, and self-purification. Furthermore, this study achieved further purification of the Ti5Si3 alloy through vacuum laser rapid melting, effectively volatilizing and removing the residual impurity elements, resulting in an increase in the purity of Ti5Si3 alloy from 96.8% to 98.6%. The resultant Ti5Si3 alloy exhibits excellent corrosion resistance in phosphate buffer solution. In summary, this work provides a crucial technical paradigm and scientific theoretical foundation for the resourceful and value-added utilization of ironmaking solid waste, specifically TBFS.
研究领域:
冶金学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Mengting Jiang,Xiaopeng Li,Tengfei Deng
In this study, aluminum titanate/anorthite (Al 2 TiO 5 -CaAl 2 Si 2 O 8 ) ceramics were fabricated from ferrotitanium slag through phase reconstruction. Stabilization of the ceramic was achieved by migration of Mg element into Al 2 TiO 5 phase. The results indicated that optimal performance was achieved with the addition of 4 wt% MgO and 60 wt% ferrotitanium slag at 1370°C. The ceramic exhibited bulk density of 3.11 ± 0.01 g/cm 3 , thermal storage density of 1.51 kJ/cm 3 , and thermal expansion coefficient of 3.40 × 10 −6 /°C (1000°C), respectively. Additionally, the solid solution of Mg 2+ in the Al 2 TiO 5 lattice reduced the formation of microcracks and enhanced the mass transfer process. Consequently, the sintering temperature decreased from 1415°C to 1370°C while the bending strength increased from 61.25 ± 1.05 MPa to 75.92 ± 7.72 MPa. Furthermore, finite element simulation demonstrated that higher thermal expansion led to concentrated thermal stress, potentially increasing the possibility of ceramic cracking. This research provides a new strategy for preparing low thermal expansion ceramics from titanium-containing solid waste.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
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2022
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IF 5.532
Qikui Man,Xueheng Zhuang,Zhenkuang Lei,Shiqi Zhu,Lining Pan,Yu Gao,Guoguo Tan
For obtaining the ecofriendly microwave absorbing composites, flake carbonyl iron was mixed to the flotation carbon waste of titanium slag by ball-milling processes. The composites of 4 h ball-milling present excellent microwave absorbing performance of minimum reflected loss (RL) of −54.9 dB at 7.8 GHz with thickness of 2.6 mm. The same composites provide the performance of RL < −10 dB with the thickness from 1.2 mm to 5 mm at corresponding matching frequency from 3.3 GHz to 18 GHz. It means that the absorbing peak can be tunable at the wide frequency range with only adjusting the thickness. The strong absorbing intensity and wide tunable frequency range are attributed to the proper impedance matching of dielectric property from flotation carbon waste of titanium slag and magnetic property from carbonyl iron. Also, this work provides a research approach for handling industrial waste which contains carbon.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
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2022
·
IF 3.752
Zhao-wang DONG,Yang XIA,Xue-yi GUO,Qing-hua TIAN,Han-ning LIU,Pei-dong LIU,Yu-bing CHEN
A direct production method of high-strength titanium alloy from upgraded titania slag (UGS) was developed. First, UGS was reduced into alloy powder with 1.3 wt.% oxygen using magnesium powder. Subsequently, the alloy powder was compacted at 600 MPa to produce a pellet. Lastly, the pellet was sintered to produce titanium alloy. The reduced powder was characterized, and the effect arising from the sintering temperature on the sintered density, compressive strength, microstructure, and hardness of the alloys was studied. The results showed that the density tended to increase with the temperature increasing from 900 to 1200 °C, whereas the porosity decreased. A significant sintering densification was achieved at the temperature above 1100 °C (98.65% at 1100 °C and 99.41% at 1200 °C). At 1100 °C, the hardness and compressive strength reached the maximal values of the alloy, HV 655.7 and 1563 MPa, respectively.
研究领域:
材料科学
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冶金工程
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产品关联
DOI
高影响因子
JOM
·
2021
·Vol. 74
·期 1
·213-221
·
IF 2.474
Deng Pan,Li Liang,Jia Yaoqiang,Liu Dachun,Jiang Wenlong,Kong Lingxin
Aluminum chloride (AlCl 3 ) is an effective chlorinating agent and catalyst for the chlorination of low-grade titanium slag to produce titanium tetrachloride in molten salts. In this paper, the chlorination behavior of low-grade titanium slag by anhydrous AlCl 3 in AlCl 3 -NaCl molten salt was investigated. Thermodynamic analysis revealed that aluminum chloride can be an effective agent for low-grade titanium slag, and that the addition of NaCl can form a compound molten salt together with AlCl 3 to prevent the evaporation of AlCl 3 .chlorination experiments were conducted on low-grade titanium slag in AlCl 3 -NaCl molten salt to investigate the effects of temperature and the amounts of aluminum chloride and sodium chloride added. Under optimized experimental conditions, the selective separation of titanium from the titanium slag was effectively achieved, and the extraction rate of titanium reached 79.6%. Other impurity elements in the form of oxides or chlorides remained in the residue. Finally, a reaction mechanism for the extraction of titanium from low-grade titanium slag in AlCl 3 -NaCl molten salt has been proposed.
研究领域:
冶金学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
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2022
·
IF 5.532
Yichong Li,Han Zhang,Huizhong Zhao,Jun Yu,Jiuhong Ma,Li Feng,Yanli Liu
Management and utilization of solid waste are necessary for sustainable development in the metallurgical industry. This study focuses on the use of ferrotitanium slag (FTS) as a low-cost source of hibonite in the refractory lining of an aluminum-melting furnace. FTS enhances the resistance of castable samples to cryolite melt penetration but reduces their bulk density and cold mechanical strength . To explain this enhancement mechanism, we present a model in which the Al 2 O 3 and SiO 2 components in the castable samples react with the cryolite melt to form a high-viscosity barrier layer against the molten cryolite. Moreover, the well-developed calcium hexaaluminate crystals in FTS, which show excellent resistance against Na + and F − , prevent the penetration of cryolite melt through the FTS aggregate area, and reduce the penetration speed. By promoting high-efficiency resource utilization, this study contributes to the development of a circular economy in the metallurgical industry.
研究领域:
冶金学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
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2023
·
IF 4.5
Zhao-wang DONG,Xue-yi GUO,Yang XIA,Pei-dong LIU,Jin-xi QIAO,Zhong-chen LI,Han-ning LIU
Silicon in two types of upgraded titania slag (UGS) containing different components was removed using a low-temperature alkali solution and melt leaching. The effects of temperature, time, and NaOH solution concentration on desilication rate were investigated. Desilication in melt can lead to the loss of titanium in upgraded titania slag. After agitating at a speed of 600 r/min and 80 °C for 300 min, the silicon content in domestic slag decreased from 0.96 wt.% to 0.29 wt.%, and the leaching rate was 69.8% after leaching in 4 mol/L sodium hydroxide solution. Under the same conditions, the silicon content in imported slag decreased from 1.11 wt.% to 0.12 wt.%, and the desilication rate was up to 89.2%. The alloy powders obtained from the reduction of upgraded titania slag with magnesium were sintered to produce titanium alloy, and the alloy was characterized. It was determined that the Ti 5 Si 3 phase in the titanium alloy product was successfully eliminated. In addition, the two UGS materials and the chemical principle of desiliconization were analyzed using a thermodynamic software.
研究领域:
材料科学
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冶金工程
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产品关联
DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
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2023
·
IF 3.5
Rui Wang,Xiaofeng Huang,Shichan Deng,Wei Zhao,Hongwei Guo,Bingji Yan,Peng Li
Ferrochromium slag (FCS) and titanium-bearing blast furnace (TBFS) were used as the main raw materials to prepare glass-ceramics by the conventional melting method in this study. The DTA tests and crystallization kinetics analysis were conducted to determine the optimum heat-treatment temperatures. The effects of FCS and TBFS addition on the glass-ceramics crystalline phase, microstructure evolution, and physical properties were investigated systematically. The results show that the dominant crystalline phases are Cr-containing augite and wollastonite in the glass-ceramics prepared from single FCS. With the increasing addition of FCS, though the crystallization ability enhanced continuously, a large amount of Cr-containing spinel precipitated, resulting in serious shrinkage cavities. When the TBFS was introduced into FCS glass-ceramics, the original silicon-oxygen was destroyed and the titanium-oxygen-silicon composite glass network formed. The ability of crystallization is further enhanced and the size of the grain is significantly refined. Simultaneously, the Cr-containing spinel is decreased obviously, which alleviates the shrinkage cavities and improves the mechanical properties of glass-ceramics. The final obtained glass-ceramics exhibits a flexural strength of 86.7 MPa, a Vickers hardness of 741.1 HV, a bulk density of 2.96 g/cm 3 , a water absorption rate of 0.36%, and a Cr ion leaching concentration of 0.66 mg/L. This study clarifies the mechanism of Cr 2 O 3 and TiO 2 in glass ceramics , which has important reference significance for the value-added utilization of FCS and TBFS.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yichong Li,Huizhong Zhao,Han Zhang,Jun Yu,Wei Wang,Jiulin Xu
Ferrotitanium slag (FTS) is the waste product that has gained attention as a potential calcium hexaaluminate (CA 6 ) resource in recent years. In this study, the phase distribution of FTS and CA 6 aggregate was compared, and its effect on the cryolite resistance of castables was further studied. Scanning electron microscopy and least-squares refinement program were used to characterize the phase distribution and crystallographic parameters of ferrotitanium slag. Computational and experimental results demonstrate that ferrotitanium slag contains denser and larger hibonite crystals compared to synthetic calcium hexaaluminate. Ti element exists in the hibonite crystal in the form of coupled substitution or direct substitution of Al 3+ . Performance evaluation in refractory castables also confirms the resulting improvement in corrosion resistance.
研究领域:
材料科学
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冶金工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
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2022
·
IF 6.267
Shushi Zhang,Zhenyang Wang,Peng Hu,Jiating Rao,Jianliang Zhang,Jing Pang
The HIsmelt process is well suited for smelting vanadium-titanium magnetite and has significant potential. In this paper, the vanadium and titanium distribution behavior at 1450 °C in the basicity range of 0.3–1.2 during HIsmelt smelting vanadium titano-magnetite was investigated experimentally for the first time. According to thermodynamic calculations combined with experimental validation, lower C content increases the activity coefficients of vanadium and titanium in the metal. Higher basicity decreases the activity coefficients of TiO 2 and SiO 2 in the slag, improves the distribution ratio of vanadium and titanium. Increasing C content and reducing basicity could increase the content of vanadium in the metal and TiO 2 in the slag, which is favorable to vanadium extraction and titanium recovery. Furthermore, the V and Ti content in the hot metal increased significantly with rising smelting temperature. Higher smelting temperatures promote vanadium distribution into hot metal but not titanium distribution into slag. Finally, The Si and Ti distribution ratios have a positive connection according to the fitted models.
研究领域:
冶金学
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材料科学
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化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）