MgO、F、碱金属对球团矿相组织的影响

doi:10.13228/j.boyuan.issn0449-749x.20210592

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Abstract Baiyun Obo ore pellets have abnormal reduction expansion due to the presence of more alkali metals and fluorine. The addition of MgO can effectively inhibit its reduction expansion and MgO is bound to affect the mineral phase composition of pellets. At present, more attention is paid no the influence of a single factor in magnesium oxide, fluorine and alkali metals on the phase of pellets, but the cooperated influence of the three factors on the phase of pellets is still lack of in-depth study. The effects of (K₂O+Na₂O), CaF₂ and MgO on the mineral phase composition of the hematite pellets were studied by orthogonal test, and their distribution in the hematite pellets was studied by mineral phase microscope, SEM-EDS, XRD and FactSage software. The results show that MgO has a significant effect on iron-containing minerals and pores of pellets, but has little effect on slag phase. The addition of magnesium oxide reduces the initial decomposition temperature of Fe₂O₃, and promotes the decomposition of hematite into magnetite. During the roasting process, Mg²⁺ diffuses into the magnetite lattice to form magnesium-containing magnetite and stabilizes the structure of magnetite, so that most of the magnesium oxide enters the iron phase of the pellets. With the increase of MgO, the content of magnesium-containing magnetite increases rapidly, which leads to the increase of magnetite content in the pellets and improves the stability of the pellets. The formed magnetite is mostly located at the edge of original hematite matrix and is connected with the hematite. When the content of MgO increased from 1% to 5%, the magnetite content increased by 6.6%, the hematite content decreased by 15.4%, and the proportion of pores increased by 9.5%. The addition of (K₂O+Na₂O) all entered into the slag phase, which had a great influence on the slag phase of pellets. When the addition content of (K₂O+Na₂O) exceeded 0.2%, the dissolution amount of Fe₂O₃ in the slag increased rapidly, which made the amount of liquid phase in the pellet increased. In the subsequent cooling process, the solidification of liquid phase led to the volume shrinkage of pellet, resulting in a decrease in the porosity of pellet. When the content of (K₂O+Na₂O) increased from 0.1% to 0.4%, the content of slag phase increased by 2.6% and the porosity decreased by 5.9%. The slag phase was mostly distributed among iron oxides without fixed shape. All of CaF₂ entered into the slag phase and had little effect on the mineral phase of pellets.

Key words： pellet mineral phase MgO fluorine alkali metals

Received: 24 September 2021

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	WANG Yong-bin
	PENG Jun
	LUO Guo-ping
	ZHANG Fang
	AN Sheng-li

Cite this article:

WANG Yong-bin,PENG Jun,LUO Guo-ping等. Effect of MgO, fluorine and alkali metals on mineral phase of pellets[J]. Iron and Steel, 2022, 57(4): 34-42.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210592 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I4/34

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