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Green evaluation of microwave-assisted leaching process of high titanium slag on life cycle assessment

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Transactions of Nonferrous Metals Society of China 2010年第S1期20卷 198-204页

作者：陈菓陈晋彭金辉万润东 Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology

A greenness evaluation index and system of microwave-assisted leaching method were *** effects of the life cycle assessment variables,such as the resource consumption,environment impact,cost,time and quality,were investigated,and the concept of green degree was applied in the production of synthetic *** analytic hierarchy process was utilized to assess matrix of greenness *** Gauss-Seidel iterative matrix method was employed to solve the assessment matrix and obtain the weights and membership functions of all evaluation indexes.A fuzzy decision-making method was applied to build the greenness evaluation model,and then the scores of green degree in microwave-assisted leaching process was *** greenness evaluation model was applied to the life cycle assessment of the microwave-assisted leaching *** results show that the microwave-assisted leaching process has advantages over the conventional ones,with respect to energy-consumption,processing time and environmental protection.

关键词： life cycle assessment greenness evaluation microwave-assisted leaching high titanium slag

Microwave absorbing properties of high titanium slag

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Journal of Central South University 2009年第4期16卷 588-593页

作者：张利波陈菓彭金辉陈晋郭胜惠段昕辉 School of Materials and Metallurgical Engineering Kunming University of Science and Technology

Microwave absorbing properties of high titanium slag were investigated by using microwave cavity perturbation technique. high titanium slag containing more than 90% TiO2 was prepared by carbothermal reduction of ilmenite. The temperature rise curve of high titanium slag in microwave heating process was obtained. Crystalline compounds of high titanium slag before and after microwave irradiation were obtained and characterized by X-ray diffractometry （XRD）. Effects of particle size of high titanium slag anal mixtures of high titanium slag with different mass fractions of V2o5 on microwave absorbing properties were investigated systematically. The results show that high titanium slag has good microwave absorption property; untreated high titanium slag mainly consists of crystalline compounds of anatase and iron titanium oxide, while the microwave-irradiation treated one is mainly composed of crystalline compounds of rutile and irgn titanium oxide. Synthetic anatase is transformed completely into rutile at about 1 050 ℃ for 20 min under microwave irradiation. high frequency shift and low amplitude of voltage make high titanium slag an ideal microwave absorbent. 180 μm of particle size and 10% mass fraction of V2O5 are found to be the optimum conditions for microwave absorption.

关键词： high titanium slag microwave absorbing microwave cavity perturbation microwave irradiation

Phase conversion and removal of impurities during oxygen-rich alkali conversion of high titanium slag

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Transactions of Nonferrous Metals Society of China 2022年第5期32卷 1664-1676页

作者： Qin-qin SUI Zhi-he DOU Ting-an ZHANG School of Metallurgy Northeastern UniversityShenyang 110819China Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Ministry of Education Northeastern UniversityShenyang 110819China

In order to achieve high-efficiency alkali conversion and impurity removal of high titanium slag under the condition of low alkali concentration,a new way of oxygen-rich alkali conversion in KOH solution was *** conversion law of element occurrence state and the influence of the conversion conditions on the titanium conversion rate and removal rate of silicon and aluminum were *** results showed that the KOH solution converted the titanium oxide in high titanium slag into whisker-like potassium *** and aluminum elements were dissolved into the *** the following conditions,KOH concentration of 6 mol/L,conversion temperature of 260℃,initial oxygen partial pressure of 2 MPa,liquid−solid ratio of 35 mL/g,conversion time of 4 h,and high titanium slag particle size of 48−74μm,the conversion rate of titanium was 97.0%,and the removal rates of silicon and aluminum were 90.2%and 76.2%,***-rich alkali conversion product was converted to rutile with a TiO_(2) grade of 99.1%by acid hydrolysis conversion.

关键词： high titanium slag alkali conversion conversion rate removal rate

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