Sintering Characteristics of Iron Ore Blends Containing High Proportions of Goethitic Ores
- PDF / 8,666,633 Bytes
- 10 Pages / 593.972 x 792 pts Page_size
- 40 Downloads / 285 Views
https://doi.org/10.1007/s11837-020-04477-x 2020 The Minerals, Metals & Materials Society
SINTERING OF OXIDES AND CONCENTRATES
Sintering Characteristics of Iron Ore Blends Containing High Proportions of Goethitic Ores LIMING LU
1,2
and JAMES MANUEL1
1.—CSIRO Mineral Resources, 2.—e-mail: [email protected]
P.O.
Box
883,
Kenmore,
QLD
4069,
Australia.
Two ore blends containing substantial channel iron deposit (CID) and Marra Mamba (MM) ores were assessed. The blends granulated well with addition of hydrated lime, which was found to improve the morphology and strength, and consequently the bed permeability of the resultant green granules. Compared with Blend 2 (a simulated industry blend), Blend 1, containing more MM and less CID ores was slightly less permeable but required similar moisture to achieve its optimum permeability. Both blends showed similar sintering characteristics as evidenced by sintering productivity and sinter quality, suggesting that Blend 1 was comparable to Blend 2. This was further supported by observations of sinter macro- and microstructure. Addition of hydrated lime improves the bed permeability and the formation and fluidity of sinter melt, consequently leading to improved sinter yield and strength along with sintering productivity. To achieve sinter return balance, the sinter return ratio had to decrease as the coke addition increased.
INTRODUCTION The counter-current principle on which the blast furnace operates makes it impossible to use iron ore fines directly as blast furnace feed. Sintering is the most widely used agglomeration process for iron ore fines for blast furnace use. In modern blast furnaces, particularly those operating in East Asia, iron ore sinter constitutes more than 60% of blast furnace burdens.1,2 Good sinter quality and high sintering productivity are thus required to sustain the extreme operating conditions and productivity of modern blast furnaces. While sinter quality is influenced by many factors, the mineralogy and physical structure of sinter undoubtedly play an important role. As the sinter mineralogy and physical structure are formed upon solidification of the primary melt generated in the sintering process, the formation and properties of the primary sinter melt, which at fixed sintering conditions depend mainly on the characteristics of iron ore fines in the blend, are particularly important in determining sinter quality.1,3
(Received August 13, 2020; accepted October 27, 2020)
The reserves of high-grade low-phosphorus Brockman hematitic ores in the Pilbara region of Western Australia are depleting. To make up for these high-grade hematitic ores and to meet the increasing demands first from Japan, then Korea, and recently China, iron ore producers started to market CID (channel iron deposit) pisolitic, such as Yandi fines, and Marra Mamba ore types (hematitegoethite), such as West Angelas and MAC fines.4 As a result, the loss on ignition (LOI) of iron ore sinter feed being mined is increasing and the lump to fine ratio is decreasing. Compare
Data Loading...
