ISSN 2594-357X
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Abstract
High temperature characteristics reflecting the performance of iron ores in sintering process play very important role on the sinter strength. Previous researches mainly concerned about the influence of chemical composition on the high temperature characteristics of iron ores, but rare researches covered the influence of gangue existing state on the high-temperature characteristics of iron ores. Experiments were conducted to study the influence of SiO2 and Al2O3 existing states on the assimilation characteristic, fluidity of liquid phase, and bonding strength of sinter body using micro-sintering equipment. The results are as follows: (1) Iron ores with different gangue content had different LATs and IFLs, with the increase of gangue, LAT decreased, IFL increased. (2) Dense gangue could increase the gangue content of local reaction interface and then led to low assimilation temperature. Moreover, compared to the Kaolin-type-SiO2, Quartz-type-SiO2 was more conductive to the assimilation reaction. (3) Low-Al2O3-SFCA with low viscosity could be formed when the gangue existed as Quartz-type-SiO2, but High-Al2O3-SFCA with high viscosity would be formed when the gangue existed as Kaolin-type-SiO2. (4) Existing state of SiO2 and Al2O3 influenced the bonding strength of sinter body further through their influence on assimilation and fluidity of iron ores, low assimilation temperature and high fluidity of liquid phase was conductive to the bonding strength.
High temperature characteristics reflecting the performance of iron ores in sintering process play very important role on the sinter strength. Previous researches mainly concerned about the influence of chemical composition on the high temperature characteristics of iron ores, but rare researches covered the influence of gangue existing state on the high-temperature characteristics of iron ores. Experiments were conducted to study the influence of SiO2 and Al2O3 existing states on the assimilation characteristic, fluidity of liquid phase, and bonding strength of sinter body using micro-sintering equipment. The results are as follows: (1) Iron ores with different gangue content had different LATs and IFLs, with the increase of gangue, LAT decreased, IFL increased. (2) Dense gangue could increase the gangue content of local reaction interface and then led to low assimilation temperature. Moreover, compared to the Kaolin-type-SiO2, Quartz-type-SiO2 was more conductive to the assimilation reaction. (3) Low-Al2O3-SFCA with low viscosity could be formed when the gangue existed as Quartz-type-SiO2, but High-Al2O3-SFCA with high viscosity would be formed when the gangue existed as Kaolin-type-SiO2. (4) Existing state of SiO2 and Al2O3 influenced the bonding strength of sinter body further through their influence on assimilation and fluidity of iron ores, low assimilation temperature and high fluidity of liquid phase was conductive to the bonding strength.
Keywords
Iron ore; Sintering; Gangue existing state; High-temperature characteristics.
Iron ore; Sintering; Gangue existing state; High-temperature characteristics.
How to refer
Zhang, Guo-liang;
Wu, Sheng-li;
Chen, Shao-guo;
Su, Bo;
Hou, Chao-gang;
Que, Zhi-gang.
INFLUENCE OF GANGUE EXISTING STATES ON THE HIGH- TEMPERATURE CHARACTERISTICS OF IRON ORE IN SINTERING PROCESS
,
p. 971-983.
In: 43º Seminário de Redução de Minério de Ferro e Matérias-Primas e o 14º Simpósio Brasileiro de Minério de Ferro,
São Paulo,
2013.
ISSN: 2594-357X
, DOI 10.5151/2594-357X-23962
