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Vanadium recovery from Na_(2)SO_(4)-added V-Ti magnetite concentrate via grate-kiln process

Transactions of Nonferrous Metals Society of China 2022年第6期32卷 2019-2032页

作者： Yi-hui YI Hu SUN Jin-xiang YOU Jin ZHANG Yuan CAI Xin ZHANG Jun LUO Guan-zhou QIU School of Minerals processing and Bioengineering Central South UniversityChangsha 410083China

Pilot experiments on Na;SO;-roasting of V-Ti magnetite(VTM) concentrate pellets were performed to activate vanadium with simulated grate-kiln machines. Combined with thermodynamic calculation, X-ray diffraction(XRD), scanning electron microscopy with energy-dispersive X-ray spectroscopy(SEM-EDS), and inductively coupled plasma-atomic emission spectrometry(ICP-AES) analyses, process parameters of pellet making were optimized, and the enhancement of vanadium oxidation and conversion was realized. The results show that, in balling stage, adding Na;SO;can promote the thermal decrepitation resistance of green pellets;in the drying stage, higher wind temperature can improve the dispersion of sodium salt in pellets;in preheating stage, using O;-rich hot gas can promote more thorough oxidation of vanadium;in roasting stage, the effect of vanadium conversion to sodium vanadate is better when the liquid amount is 15.5%-22.5%. Based on the above measures, the vanadium conversion rate achieved in the roasted pellets is 85.6%, proving the feasibility of vanadium recovery using an existing pellet production line.

关键词： vanadium V-Ti magnetite pellet Na_(2)SO_(4)roasting grate-kiln process thermodynamics

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Control of nitrogen oxides emission by selective non-catalytic reduction in preheating section during iron ore pellets production

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Journal of Iron and Steel Research International 2022年第2期29卷 215-222页

作者： Min Gan Wang Shu Zhi-yun Ji Zhi-an Zhou Xiao-hui Fan Bing Hu Guo-jing Wang Yuan Zhu Ya-fei Sun School of Minerals processing and Bioengineering Central South UniversityChangsha410083HunanChina Zhongye Changtian International Engineering Co. Ltd.Changsha410205HunanChina

Reducing the NO_(x) emission from pelletizing process is of great importance to the green development of iron and steel *** flue gas temperature of preheating(PH)section during grate-kiln iron ore pelletizing process typically ranges within 850–1050℃,which meets the temperature requirements of selective non-catalytic reduction(SNCR)for NO_(x).The in-bed SNCR behavior of NO_(x) in the PH section was investigated,and the influence of relevant parameters was *** show that with the flue gas temperature rising,the denitration rate reached a peak value and then declined,where the appropriate temperature range was 950–1000℃.Increasing the NH_(3)/NO ratio(NSR)contributed to improving the denitration rate,and the appropriate NSR was *** content in the flue gas also showed an important influence on denitration rate,which reached a peak value and then dropped with the oxygen content *** the condition of 18 vol.%oxygen content,the denitration reaction mainly occurred in the form of 4NO+4NH_(3)+O_(2)=4N_(2)+6H_(2)*** restricting the competitive reaction of NH_(3) oxidation,the oxygen content in flue gas of PH section should be kept at an appropriate *** general,the denitration rate reached about 25%in the PH section through spraying ammonia.

关键词： Iron ore pellet grate-kiln process Flue gas Selective non-catalytic reduction denitration Denitration mechanism

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Micro-analysis of high-temperature oxidation-resistance of a new kind of heat-resistant grid plate in grate-kiln

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International Journal of Minerals,Metallurgy and Materials 2009年第6期16卷 632-639页

作者： Jun-you Liu Feng Li Jie Liu Yi Zhang Yu-lei Wang School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Beijing BKDR Metallurgy Engineering ＆ Technology Co. Ltd. Beijing 100083 China

To further improve the oxidation-resistance of materials and reduce the cost of grid plates in grate-kiln, a new kind of heat-resistant grid plate was developed. The microstructure of this grid plate with a life more than 18 months was studied by XRD, SEM and EDS techniques. The results show that high hardness, high intensity and good impact property make the new kind of heat-resistant grid plate and its oxide film have a higher resistance to deformation and abrasion at 900-1000℃ Besides, small grain size is beneficial to form a complete protective oxide film. The oxide film composed of SiO2 layer, Cr2O3 layer and Fe2O3 layer is rather thin and bonds closely with the backing. The forming of the chemical stable nickel-rich layer increases the density of Cr2O3 layer.

关键词： grate-kiln process grid plate heat resistance high-temperature oxidation-resistance oxide film

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