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Phosphorus migration mechanism between iron and high phosphorus gangue phase at high temperatures

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The phosphorus migration mechanism during melting separation of non-carbon-reduced high phosphorus iron ore was investigated. Firstly, the equilibrium compositions of hydrogen-reduced high phosphorus iron ore at different temperatures were simulated by the use of equilibrium composition module of HSC Chemistry software. Then, thermodynamic cal-culation was verified by the real heat treatment of simulated hydrogen-reduced high phosphorus iron ore with several pure reagents including self-made pure fluorapatite. The iron particles in the simulated samples gathered and grew up during heat treatment. Meanwhile, the hypoeutectic structure of Fe–P with grid shape of high phosphorus phase and circular shape of low phosphorus phase emerged within those iron particles. With the penetration of phosphorus from the periphery into the iron particles, the grid structure became denser and denser. It proves that the elemental phosphorus can be reduced from the gangue phase by metallic iron without solid carbon at high temperatures.

Melting separationFluorapatiteThermodynamicsPhosphorus migrationHigh phosphorus iron ore

Lei Guo、Jin-tao Gao、Sheng-ping Zhong、Zhan-cheng Guo

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

This study is supported by the China Postdoc-toral Science FoundationOpen Projects of State Key Laboratory of Advanced MetallurgyNational Key Research and Development Plan of China

2017M610768 416170132016YFB0601304

2019

钢铁研究学报(英文版)
钢铁研究总院

钢铁研究学报(英文版)

CSTPCDCSCDSCIEI
影响因子：0.584
ISSN：1006-706X
年,卷(期)：2019.26(2)
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