铁矿石溶解与烧结熔体流动行为机理

doi:10.13228/j.boyuan.issn0449-749x.20220071

Abstract
Figure/Table
References
Related Citation (15)

Download: PDF (5496 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract During iron ore sintering, iron ores dissolve partially into sintering melt, which has a direct effect on the properties of melt, and hence the bonding of sinter. In order to clarify the interaction between iron ore and sintering melt, adhering fines of calcium ferrites existing in forms of Ca_3.6Fe_14.4O_25.2 and CaFe₂O₄ were prepared by calcination of chemical pure reagents. The behaviors of iron ore dissolution and sintering melt flow were studied through laboratory sintering method on the sintering couple composed of seven kinds of nuclei ore and adhering fines of calcium ferrites (w(CaO)=15%). Based on this, chemical compositions of nuclei ore were simulated using chemical pure reagents, and therefore the influence law of SiO₂ contents and Al₂O₃ contents in nuclei ore on horizontal flow area of melt and dissolution index of nuclei ore as well as its mechanism were explored. The results show that when nuclei ore dissolves into CaO-Fe₂O₃ system liquid phase, the interaction region is formed. After the minerals in iron ore, especially quartz, dissolves into the melt, complex CaO-Fe₂O₃ system liquid phase is formed at the area near the melt. At the same time, simple CaO-Fe₂O₃ system liquid phase is transformed into CaO-Fe₂O₃-SiO₂ system liquid phase at the area near nuclei ore. As the main minerals, calcium ferrites and hematite precipitate at the area near the melt, while silicates and hematite precipitate at the area near nuclei ore. With increasing of SiO₂ content in nuclei ore, on the one hand, the amount of SiO₂ dissolved into the melt increases, resulting in raising of dissolution index of nuclei ore. On the other hand, the viscosity of simple CaO-Fe₂O₃ system liquid phase is increased, resulting in reducing of horizontal flow area of melt. With increasing of Al₂O₃ content in nuclei ore, amount of Al₂O₃ dissolved into the melt increases, which decreases horizontal flow area of melt, but increases dissolution index of nuclei ore. Al₂O₃ in nuclei ore has stronger influence than SiO₂ on the behaviors of iron ore dissolution and sintering melt flow.

Key words： iron ore sinter melt dissolution flow

Received: 24 January 2022

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	ZHAI Xiao-bo
	ZHENG Jun
	WANG Gang
	ZOU Zhong-ping
	ZHOU Heng

Cite this article:

ZHAI Xiao-bo,ZHENG Jun,WANG Gang等. Mechanism on behaviors of iron ore dissolution and sintering melt flow[J]. Iron and Steel, 2022, 57(8): 60-68.

URL:

http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20220071 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I8/60

[1] 寇明银,张众,曾旺,等.铁矿粉烧结优化配矿及其模型研究进展[J].钢铁,2022, 57 (2): 1.(KOU Ming-yin, ZHANG Zhong, ZENG Wang, et al. Research progress on optimization technology and its model of ore-blending for sintering process[J]. Iron and Steel, 2022, 57 (2): 1.)
[2] 李彬,张宗旺,吴胜利,等.不同铁矿粉替代澳洲低铝矿粉对烧结黏结相高温行为的影响[J].中国冶金,2021, 31 (12): 8.(LI Bin, ZHANG Zong-wang, WU Sheng-li, et al. Effect of different iron ore replaced Australian low aluminum ore powder on high temperature behavior of sintered binder phase[J]. China Metallurgy, 2021, 31 (12): 8.)
[3] WU S, ZHAI X, SU L, et al. Ore-blending optimization for Canadian iron concentrate during iron ore sintering based on high-temperature characteristics of fines and nuclei[J]. Journal of Iron and Steel Research, International, 2020, 27(7): 755.
[4] ZHAI X, WU S, ZHOU H, et al. Flow and penetration behaviours of liquid phase on iron ore substrate and their effects on bonding strength of sinter[J]. Ironmaking and Steelmaking, 2020, 47(4): 405.
[5] 翟晓波,吴胜利,阙志刚.加拿大铁精粉对烧结体固结强度的影响及其改善方法[J].钢铁,2019, 54 (6): 27.(ZHAI Xiao-bo, WU Sheng-li, QUE Zhi-gang. Effect of Canadian iron concentrate on bonding strength of sinter body and thereof improvement method[J]. Iron and Steel, 2019, 54 (6):27.)
[6] Okazaki J, Higuchi K, Hosotani Y, et al. Influence of iron ore characteristics on penetrating behavior of melt into ore layer[J]. ISIJ International, 2003, 43(9): 1384.
[7] WU S, ZHANG G. Liquid absorbability of iron ores and large limonite particle divided adding technology in the sintering process[J]. Steel Research International, 2015, 86(9): 1014.
[8] WU S, SU B, QI Y, et al. Melt absorbability of iron ore nuclei and its influence on suitable liquid content of sintered body[J]. Metallurgical and Materials Transaction B, 2017, 48B(5): 2469.
[9] ZHU J, WU S, FAN J, et al. Effect of the separation of large limonite ore particles in the granulation process of sinter raw materials[J]. ISIJ International, 2013, 53(9): 1529.
[10] Oyama N, Higuchi T, Machida S, et al. Effect of high-phosphorous iron ore distribution in quasi-particle on melt fluidity and sinter bed permeability during sintering[J]. ISIJ International, 2009, 49(5): 650.
[11] Otomo T, Takasaki Y, Kawaguchi T. Properties of core ore in quasi-particle required for large amounts usage of limonitic ores in iron ore sintering process[J]. ISIJ International, 2005, 45(4): 532.
[12] Wang Z, Pinson D, Chew S, et al. Behavior of New Zealand ironsand during iron ore sintering[J]. Metallurgical and Materials Transaction B, 2016, 47(1): 330.
[13] Ware N, Manuel J. Fundamental nucleus assimilation behaviour of haematite and goethite containing ores in iron ore sintering[J]. Mineral Processing and Extractive Metallurgy, 2016, 125(3): 149.
[14] Nakashima K, Saito N, Shinozaki S, et al. Wetting and penetration behavior of calcium ferrite melts to sintered hematite[J]. ISIJ International, 2004, 44(12): 2052.
[15] Saito N, Hori N, Nakashima K, et al. Viscosity of blast furnace type slags[J]. Metallurgical and Materials Transaction B, 2003, 34(5): 509.
[16] SHEN F, LI G, DING Z, et al. Melting characteristics and wettability of binding phase in sinter[J]. Journal of Iron and Steel Research, International, 2009, 16(3): 1.
[17] 李光森,金明芳,魏国,等.含氟烧结矿粘结相润湿性研究[J].钢铁,2007,42(8): 12.(LI Guang-sen, JIN Ming-fang, WEI Guo, et al. On wettability of binding phase in fluorine-bearing sinter[J]. Iron Steel, 2007, 42(8): 12.)
[18] YU B, LÜ X, XIANG S, et al. Wetting behavior of Al₂O₃ substrate by calcium ferrite series melts[J]. ISIJ International, 2015, 55(3): 483.
[19] YU B, LÜ X, XIANG S, et al. Wetting behavior of calcium ferrite melts on sintered MgO[J]. ISIJ International, 2015, 55(8): 1558.
[20] YANG M, LÜ X, WEI R, et al. Wetting behavior of TiO₂ by calcium ferrite slag at 1 523 K[J]. Metallurgical and Materials Transaction B, 2018, 49(10): 2667.
[21] YANG M, LÜ X, WEI R, et al. Wetting behavior of calcium ferrite slags on cristobalite substrates[J]. Metallurgical and Materials Transaction B, 2018, 49(7): 1331.
[22] LONG H, WU X, CHUN T, et al. Assimilation behavior of calcium ferrite and calcium diferrite with sintered Al₂O₃ and MgO[J]. Metallurgical and Materials Transaction B, 2016, 47(5): 2830.
[23] LIU D, ZHANG J, LIU Z, et al. Effects of liquid infiltration characteristics of iron ores with a high proportion of limonite on sinter strength[J]. Metallurgical Research and Technology, 2016, 113(3): 301.
[24] LIU D, ZHANG J, XUE X, et al. Infiltration behavior of sintering liquid on nuclei ores during low-titanium ore sintering process[J]. International Journal of Minerals, Metallurgy and Materials, 2016, 23(6): 618.
[25] Webster N A S, Pownceby M I, Madsen I C, et al. Silico-ferrite of calcium and aluminum (SFCA) iron ore sinter bonding phases: New insights into their formation during heating and cooling[J]. Metallurgical and Materials Transaction B, 2012, 43(12): 1344.
[26] Machida S, Nushiro K, Ichikawa K, et al. Experimental evaluation of chemical composition and viscosity of melts during iron ore sintering[J]. ISIJ International, 2005, 45(4):513.