南非PMC精粉与两种典型褐铁矿的配矿优化

doi:10.13228/j.boyuan.issn0449-749x.20220757

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Abstract The mass percent of TFe and TiO₂ for PMC concentrate (PMC for short) is relatively high, with a value of 62.5% and 2.6% respectively. Compared to iron ore fines of Carajas (IOC) from Brazil and other imported iron ore concentrates, PMC has an advantage in price and hence a strong liquidity in iron ore market. As a result, it is widely used in iron ore sintering process by many domestic steelworks. The proportion of PMC in iron ore mixtures for sintering in Hansteel is about 4% to 6%. To make full use of PMC in sintering, based on the ore-blending practice in Hansteel, the optimization on binary and ternary systems of PMC and two limonite ores (Yandi fine and FMG blend) was studied thoroughly. Firstly, the physicochemical properties, sintering basic characteristics and mineralogical composition after the test of bonding-phase strength for the aforementioned ores were examined. Considering the sintering basic characteristics of the tested iron ores, taking liquid-phase fluidity and bonding-phase strength as the sintering performance indexes, the ore-blending optimization between PMC and the two limonite ores was carried out. The experimental results show that the high contents of TFe, CaO and MgO and low contents of SiO₂ and Al₂O₃ are the advantages of PMC, while the main problems of PMC for sintering are high contents of TiO₂ and P, high digestion temperature and poor fluidity of liquid phase. Property complementarity in chemical composition, particle sizes and the sintering basic characteristics between PMC and the two limonite ores can be found and applied to ore-blending of the sinter mixtures. Increasing PMC content in the binary ore blending would weaken its liquid-phase fluidity gradually. However, the bonding-phase strength will basically be enhanced firstly and then drop sharply with the increase of PMC content from 0 to 100%. When the mass ratio of PMC to Yandi fine or to FMG blend is 1∶3 or 1∶2, the maximum bonding-phase strength of the mixtures can be obtained, with a value of 1 785 N or 1 605 N separately. The bonding-phase strength of the ternary mixture derived from the optimized binary blending was also high, that is 1 270 N. With the mass ratio of limonite ores to PMC increasing from 2.5∶1 to 4∶1, FMG blend has a stronger influence than Yandi fine on bonding-phase strength, with its value dropped to 740 N, while that is 1 170 N for the Yandi fine. Mineral phase analysis on samples after bonding-phase strength test indicated that: with the liquid-phase fluidity of the mixture falling in the range of 3.0 to 3.5, both the quantity of macro pore and the mean pore diameter in mineral phases can be decreased significantly, and thus the bonding-phase strength of the sample can be improved effectively.

Key words： PMC concentrate liquid-phase fluidity bonding-phase strength ore-matching method mineral phase structure

Received: 06 December 2022

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	HOU Jian
	BAI Chenguang
	HU Meilong
	LIU Xiaoming
	HUANG Xiaobo
	GUO Lanfen

Cite this article:

HOU Jian,BAI Chenguang,HU Meilong等. Optimization on ore-blending of PMC concentrate and two typical limonite ores[J]. Iron and Steel, 2023, 58(6): 45-52.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20220757 OR http://www.chinamet.cn/Jweb_gt/EN/Y2023/V58/I6/45

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