Oxidation behavior of FeV_(2)O_(4)and FeCr_(2)O_(4)particles in the air:Nonisothermal kinetic and reaction mechanism  

作　　者：Junyi Xiang Xi Lu Luwei Bai Hongru Rao Sheng Liu Qingyun Huang Shengqin Zhang Guishang Pei Xuewei Lü 

机构地区：[1]School of Metallurgy and Materials Engineering,Chongqing University of Science and Technology,Chongqing 401331,China [2]Department of Materials Science and Engineering,Seoul National University,Seoul 08826,Rep.of Korea [3]College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2024年第8期1839-1848,共10页矿物冶金与材料学报（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(No.52004044);the Natural Science Foundation of Chongqing,China(Nos.cstb2022nscqmsx0801 and cstc2021jcyj-msxmx0882);the Foundation of Chongqing University of Science and Technology(No.ckrc2022030);the Graduate Research Innovation Project of Chongqing University of Science and Technology(No.YKJCX2220216);the National Undergraduate Training Program for Innovation and Entrepreneurship(No.202311551007).

摘　　要：High-temperature oxidation behavior of ferrovanadium(FeV_(2)O_(4))and ferrochrome(FeCr_(2)O_(4))spinels is crucial for the application of spinel as an energy material,as well as for the clean usage of high-chromium vanadium slag.Herein,the nonisothermal oxidation behavior of FeV_(2)O_(4)and FeCr_(2)O_(4)prepared by high-temperature solid-state reaction was examined by thermogravimetry and X-ray diffraction(XRD)at heating rates of 5,10,and 15 K/min.The apparent activation energy was determined by the Kissinger-Akahira-Sunose(KAS)method,whereas the mechanism function was elucidated by the Malek method.Moreover,in-situ XRD was conducted to deduce the phase transformation of the oxidation mechanism for FeV_(2)O_(4)and FeCr_(2)O_(4).The results reveal a gradual increase in the overall apparent activation energies for FeV_(2)O_(4)and FeCr_(2)O_(4)during oxidation.Four stages of the oxidation process are observed based on the oxidation conversion rate of each compound.The oxidation mechanisms of FeV_(2)O_(4)and FeCr_(2)O_(4)are complex and have distinct mechanisms.In particular,the chemical reaction controls the entire oxidation process for FeV_(2)O_(4),whereas that for FeCr_(2)O_(4)transitions from a three-dimensional diffusion model to a chemical reaction model.According to the in-situ XRD results,numerous intermediate products are observed during the oxidation process of both compounds,eventually resulting in the final products FeVO_(4)and V2O_(5)for FeV_(2)O_(4)and Fe_(2)O_(3)and Cr_(2)O_(3)for FeCr_(2)O_(4),respectively.

关 键 词：FeV_(2)O_(4) FeCr_(2)O_(4) oxidation nonisothermal kinetics mechanism 

分 类 号：TQ138.11[化学工程—无机化工] TQ136.11[理学—物理化学] O643.1[理学—化学]