Improvement of Sinter Productivity and Qualities by Placing Low Slag Green Pellet at Lower Layer of Sinter Packed Bed

Masaru MatsuMura, Yasuhide YaMaguchi, Kenichi Higuchi, Taichi MurakaMi, Takayuki Maeda

Research output: Contribution to journalArticlepeer-review

Abstract

In order to blend PF (pellet feed) or concentrates for 20 mass% in sinter mixture and to displace coke fines or anthracite to biomass for 25 mass% in BAR (Bonding Agent Rate), sinter packed bed has been designed in ISIJ Research workshop. Outline of the design is shown as below. As designing, most important factor is permeability, and it has to be maintained even though fine materials as PF or concentrates is highly blended (20 mass%). For high permeability, GP [Green Pellet] granulated from fine materials, is placed in lower layer of raw materials packed bed. In the lower layer, mill scale and biomass char, which has characteristic of different oxidation or combustion temperature and rate compared to coke fine, are placed with coke fines for keeping high temperature (>1200°C), because GP needs longer sintering time due to large diameter. In addition, chemical composition of GP is low bacisity (1.5) and low CaO content for keeping its shape through restricting melt formation at sintering. Restricting melt formation has possibility of improving sinter quality (RI, RDI). In this study, Effect of the packed bed mentioned above on sinter performance and quality has been confirmed by sintering simulator which has performance of continuous charging and igniting with moving pallet car. The main results are shown as below. 1) Sintering speed and product yield are maintained at blending 20 mass% of PF. So, sinter productivity are also maintained. 2) Sinter reducibility (RI) has been improved in addition to maintaining sinter reduction disintegration index (RDI) because of low FeO and low SiO2 content and restricting secondary hematite formation as mineral of sinter. 3) Remaining object is recovering sinter strength (TI) at the condition of low CaO content in sinter.

Original languageEnglish
Pages (from-to)471-482
Number of pages12
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume107
Issue number6
DOIs
Publication statusPublished - Jun 1 2021

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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