High-phosphorus iron ore resource is considered a refractory iron ore because of its high-phosphorus content and complex ore phase structure. Therefore, the development of innovative technology to realize the efficient utilization of high-phosphorus iron ore resources is of theoretical and practical significance. Thus, a method for phosphorus removal by gasification in the hydrogen-rich sintering process was pro-posed. In this study, the reduction mechanism of phosphorus in hydrogen-rich sintering, as well as the reduction kinetics of apatite based on the non-isothermal kinetic method, was investigated. Results showed that, by increasing the reduction time from 20 to 60 min, the dephosphoriza-tion rate increased from 10.93％ to 29.51％. With apatite reduction, the metal iron accumulates, and part of the reduced phosphorus gas is ab-sorbed by the metal iron to form stable iron–phosphorus compounds, resulting in a significant reduction of the dephosphorization rate. Apatite reduction is mainly concentrated in the sintering and burning zones, and the reduced phosphorus gas moves downward along with flue gas un-der suction pressure and is condensed and adsorbed partly by the sintering bed when passing through the drying zone and over the wet zone. As a result, the dephosphorization rate is considerably reduced. Based on the Ozawa formula of the iso-conversion rate, the activation energy of apatite reduction is 80.42 kJ/mol. The mechanism function of apatite reduction is determined by a differential method (i.e., the Freeman–Car-roll method) and an integral method (i.e., the Coats–Redfern method). The differential form of the equation is f(α) = 2(1 ? α)1/2, and the integ-ral form of the equation is G(α) = 1 ? (1 ? α)1/2.

Yanbiao Chen;Wenguo Liu;Haibin Zuo

State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China

矿物冶金与材料学报

[1]Yanbiao Chen;Wenguo Liu;Haibin Zuo-.Phosphorus reduction behavior of high-phosphate iron ore during hydrogen-rich sintering)[J].矿物冶金与材料学报,2022(10):1862-1872

dephosphoriza,dephosphorization

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