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中南大学学报(英文版)

Journal of Central South University

Vol. 17    No. 4    August 2010

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Influence of flux additives on iron ore oxidized pellets
FAN Xiao-hui(范晓慧), GAN Min(甘敏), JIANG Tao(姜涛), YUAN Li-shun(袁礼顺), CHEN Xu-ling(陈许玲)

School of Resources Processing and Bioengineering, Central South University, Changsha 410083, China

Abstract:Six additives, i.e., limestone, lime, magnesite, magnesia, dolomite and light-burned-dolomite, were added for investigating their influences on the pellet quality. For green balls, adding lime and light-burned-dolomite makes the wet drop strength decrease firstly, and then increase with further increase of additive dosage. Ca(OH)2 affects the bentonite properties at the beginning, but the binding property of Ca(OH)2 will be main when the dosage is higher. The other four additives decrease the drop strength for their disadvantageous physical properties. For preheated pellets, no mater what kind of additive is added, the compressive strength will be decreased because of unmineralized additives. For roasted pellets, calcium additives can form binding phase of calcium-ferrite, and suitable liquid phase will improve recrystallization of hematite, but excessive liquid will destroy the structure of pellets, so the compressive strength of pellet increases firstly and then drops. When adding magnesium additives, the strength will be decreased because of the oxidation of magnetite retarded by MgO.

 

Key words: iron ore; additives; oxidized pellets; compressive strength

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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