关键词: 物料形式, 鲕状赤铁矿, 深度还原效果, 金属铁颗粒

Abstract: In order to investigate the influence of material status on deep reduction effect，influence of two material status as briquetting and loose ore on oolitic hematite ore deep reduction effect was investigated using oolitic hematite ore from Guandian，Hubei Province as raw material.The results showed that iron metallization ratio and magnetic separation index of briquetting were better than loose ore′s；with increase of reduction temperature，prolong of reduction time and the decrease of raw ore granularity，reduction products iron metallization ratio and magnetic separation index of different material status both increase.Briquetting was superior to the loose ore on reduction index，metal particle size and particle shape due to its better heat conduction and micro-gap structure.Scanning Electron Microscope(SEM) analysis on reduced products reflected that metal particle sizes of briquetting were obviously larger than loose ore′s.Meanwhile，the roasting destruction of oolite was more heavily as the ore to be briquetted，means that briquetting was more benefit to the reduction of iron mineral.Briquetting could provide relatively faster heat conduction and higher concentration of reduction atomosphere which abounded in the interface of iron oxide，and then accelerated the process of the metallization reaction.Test results could provide references for the selection of feeding form and the optimization of reduction conditions in further application.

Key words: Material status, Oolitic hematite, Deep reduction index, Metal iron particle