ZHANG Fang
,
AN Sheng-li
,
LUO Guo-ping
,
WANG Yi-ci
钢铁研究学报(英文版)
Abstract： Baivumebo iron ore is special magnetite containing fluorine, kalium and sodium elements, and the main raw material for ironmaking of Baotou Iron and Steel (Group) Co. The effects of basicity and ratio of Al2O3 to SiO2 (A/S) on the formation of silico-ferrite of calcium and aluminium (SFCA) in Baivumebo low silica sinters were studied by means of mini-sintering, XPF-500 optical mineralogical microscope and CSS-88000 electronic universal testing machine. The results show that it is beneficial to the formation of complex calcium ferrite to enhance the basicity of Baivumebo low silica sinters. The acicular SFCA-I was increased with the enhancing basicity and reached the peak at basicity 28, then the columnar or platy SFCA formed and the bonding strength decreased. Alumina is beneficial to the formation of acicular complex calcium ferrite in Baivumebo low silica sinters. But the residual unfused Al2O3 reagent came into being when A/S was 035, while complex calcium ferrite still remained to be acicular. There is a common rule about mineralogy components affected by basicity and ratio of A/S, that is, SFCA is increasing accompanied with hematite and porosity reduced, but the content of glass phase is stable.
关键词:
Key words: Baivumebo iron concentrates
,
Baivumebo low silica sinter
,
SFCA
,
basicity
,
alumina-silica ratio
WANG Yi-ci
,
ZHANG Jian-liang
,
ZHANG Fang
,
LUO Guo-ping
钢铁研究学报(英文版)
Influence of sintering temperature, basicity and MgO content on the formation characteristics of calcium ferrite in low silicon sinter of Baotou Iron and Steel Company was studied by means of mini-sintering test and mineralographic microscope analysis. In addition, the suitable sintering parameters such as temperature and basicity were explored. The results found that optimum temperature for the formation of calcium ferrite is 1280 ℃, the basicity of 25-28 is helpful to the development of acicular or columnar calcium ferrite, and MgO content in the low silicon sintering raw materials should be lower than 28% because MgO can intensively inhibit the formation of calcium ferrite. And calcium ferrite in the sinter belongs to calcium ferrite with low calcium, which is different from that in ordinary sinter at home and abroad. So, it provided theoretical basis for promoting formation of calcium ferrite in low silicon sinter and improving properties of sinter.
关键词:
low silicon sinter
,
formation characteristics
,
calcium ferrite
,
sintering temperature
,
basicity
