Effect of pre-wetting treatment on the granulation behavior of iron ore fines

Author:

Huang, Xiaobo; Lv, Xuewei; Bai, Chenguang; Qiu, Guibao; Lu, Liming

Date of Publication:

2014-12

Publication Type:

Journal Article

Journal Title:

ISIJ International

Volume:

54

Issue:

12

Pages:

2721-2727

Abstract:

Together with the conventional granulation, a proposed pre-wetting granulation for two commercial sinter mixtures consisted of six different iron ores and other auxiliary materials has been investigated under controlled laboratory conditions. A method to describe the size variation of the granules between different granulation trials was proposed and studied in the granulation of this study. It is a method by drawing a cumulative undersized curve (CUS curve) and a differential cumulative undersized curve (Δ‑CUS curve) into one figure. The results indicated that (1) with more water available for granulation, more particles in a sinter raw mixture would behave as the layering fines in granules and the upper size for these layering fines would increase from 1 mm to 4.5 mm in conventional granulation; (2) compared to the results from conventional granulation, the granulation with pre-wetting treatment on iron ore fines resulted in a tighter particle size distribution and a higher permeability before ignition. At similar moisture content, more particles can be shifted into the layering fines in pre-wetting granulation than in conventional granulation; (3) Due to the preferential granule growth and the deformation of the granules, a further increase in pre-wetting degree (PWD) from 65% to 80% had little influence on the optimal permeability before ignition. Furthermore, a sinter mixture with more materials that are high in moisture absorption capacity would lead to higher optimum moisture content in granulation.

Publisher:

Iron and Steel Institute of Japan

Keywords:

pre-wetting granulation; granulation behavior; particle size distribution; permeability

Field Of Research:

Resources Engineering and Extractive Metallurgy not elsewhere classified

DOI:

https://doi.org/10.2355/isijinternational.54.2721

URL:

Link to Publisher's Version

Rights Notice:

© 2014 ISIJ

Identifier:

EP15548

Publication Sub Type:

Journal article - Refereed

Language:

English

Attribution Statement:

Huang, Xiaobo; Lv, Xuewei; Bai, Chenguang; Qiu, Guibao; Lu, Liming. Effect of pre-wetting treatment on the granulation behavior of iron ore fines. ISIJ International. 2014; 54(12):2721-2727. https://doi.org/10.2355/isijinternational.54.2721