Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Improvement of Strength of Preheated Pellet with Small Addition of Sodium Silicate
Koichi MORIOKAJunpei KIGUCHITadashi UEDANobuyuki IWASAKI
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2001 Volume 87 Issue 5 Pages 282-289

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Abstract

In the iron are pelletizing process of grate-kiln system for induration, pellets are indurated at about 1000°C within a traveling grate and then at about 1 200°C within a rotary kiln. It is very important for pelletizing process to increase strength of preheated pellet, which means the pellet crushing strength before a rotary kiln, in order to prevent the collapse of pellets in a rotary kiln. Therefore, to strengthen pellets sufficiently within a traveling grate with shorter time, an application of liquid phase sintering method to palletizing process was studied experimentally with addition of sodium silicate solution. The results are summarized as following:
( 1 ) The strength of preheated pellets was increased by addition of dilute sodium silicate solution with low melting temperature.
( 2 ) The strength of preheated pellets with addition of sodium silicate solution for granulating water, was much more increased than that with addition of solid sodium silicate.
( 3 ) Addition of sodium silicate solution did not influence on reducibility, reduction degradation index and reduction test under load of pellets.

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© The Iron and Steel Institute of Japan
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