高硅型铁矿对烧结工艺及烧结矿冶金性能的影响

doi:10.13228/j.boyuan.issn0449-749x.20230296

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Abstract At present, the global iron ore price index continues to rise, the issue of low-quality iron ore resources and rising steel production demand that iron and steel companies are currently dealing with had a significant influence to maintain their stable development. The Baoshan sintering base of Baosteel steadily increased the usage of high silicon iron ore powder to achieve the strategy of blast furnace ironmaking resources, extend the procurement channels of ore resources, and strengthen the right to speak of Baowu ore resources procurement. Nevertheless, the effect of increasing the proportion of high-silica iron ore powder on the sintering mechanism and the formation mechanism of compound calcium ferrate (SFCA) is not clear, so based on a high proportion of high-silica iron ore sintering test to research. The effect of high silica-type iron ore on the generation mechanism and solidification mechanism of SFCA as well as the metallurgical performance of sintered ore was researched using the micro sintering experiment, sintering cup test and the Baosteel sintering machine industrial test. The findings demonstrate that when the replacement ratio of high silica-type iron ore powder is raised to 12%, the assimilative temperature and liquid phase fluidity index increase gradually, but the decrease of the crystalline strength is more pronounced and decreases rapidly from 1 080.72 N to 745.79 N, which is primarily related to the formation of the silicate phase. The detrimental impact of silica on the formation of the binder phase was lessened with an increase in reaction time and temperature. The mass percent of ferrous iron increases from 8.7% to 9.1% as the proportion of high silica iron ore powder replacing Tubarang powder rises. This is due to an increase in calcium ferrate, which reduces the production of calcium silicate and iron olivine and improves the fluidity of the liquid phase binder phase. Consideration of the ideal high silica iron ore powder replacement ratio should be less than 12%. The results can provide theoretical guidance and a reference basis for the sintering of high silica iron ore and benefit the economical material strategy.

Key words： sinter high silicon iron ore mineral phase structure metallurgical properties SFCA proportion of ore blending

Received: 31 May 2023

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	WU Ying
	GAO Lihua

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WU Ying,GAO Lihua. Effect of high-silicon iron ore on sintered on ore sintering process and metallurgical properties[J]. Iron and Steel, 2024, 59(2): 25-35.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20230296 OR http://www.chinamet.cn/Jweb_gt/EN/Y2024/V59/I2/25

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