Effects of SiO<sub>2</sub> on the preparation and metallurgical properties of acid oxidized pellets

Jian-guang Lu; Chen-chen Lan; Qing Lyu; Shu-hui Zhang; Jian-ning Sun

doi:10.1007/s12613-020-2236-4

Volume 28 Issue 4

Apr. 2021

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2021 > 28(4): 629-636

Jian-guang Lu, Chen-chen Lan, Qing Lyu, Shu-hui Zhang, and Jian-ning Sun, Effects of SiO₂ on the preparation and metallurgical properties of acid oxidized pellets, Int. J. Miner. Metall. Mater., 28(2021), No. 4, pp. 629-636. https://doi.org/10.1007/s12613-020-2236-4

Cite this article as:

Jian-guang Lu, Chen-chen Lan, Qing Lyu, Shu-hui Zhang, and Jian-ning Sun, Effects of SiO2 on the preparation and metallurgical properties of acid oxidized pellets, Int. J. Miner. Metall. Mater., 28(2021), No. 4, pp. 629-636. https://doi.org/10.1007/s12613-020-2236-4

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Research Article

Effects of SiO₂ on the preparation and metallurgical properties of acid oxidized pellets

+ Author Affiliations

Corresponding author:
Qing Lyu E-mail: lq@ncst.edu.cn
Received: 23 October 2020; Revised: 8 December 2020; Accepted: 12 December 2020; Available online: 12 December 2020

Abstract

Abstract

The effects of SiO₂ content on the preparation process and metallurgical properties of acid oxidized pellets, including compressive strength, reduction, and softening–melting behaviors, were systematically investigated. Mineralogical structures, elemental distribution, and pore size distribution were varied to analyze the mechanism of the effects. The results show that with an increase in SiO₂ content from 3.51wt% to 7.18wt%, compressive strength decreases from 3150 N/pellet to 2100 N/pellet and reducibility decreases from 76.5% to 71.4%. The microstructure showed that pellets with high SiO₂ content contained more magnetite in the mineralogical structures. Additionally, some liquid phases appeared, which hindered the continuous crystallization of hematite. Also, the softening–melting properties of the pellets clearly deteriorated as the SiO₂ content increased. With increasing SiO₂ content, the temperature range of the softening–melting zone decreased, and the maximum differential pressure and the comprehensive permeability index increased significantly. When acid oxidized pellets are used as the raw materials for blast furnace smelting, it should be combined with high basicity sinters to improve the softening–melting behaviors of the comprehensive charge.
- acid oxidized pellets;
- SiO₂ content;
- metallurgical property;
- mineralogical structure

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