An assessment of the production of fine material in iron ore sinter

Abstract

Iron ore sinter is produced from fine grained ore in order to provide a direct charge to the blast furnace. During the sinter production process, fine sinter is produced that is not acceptable as feedstock for the blast furnace. The aim of this study is to compare the composition and phase chemistry of the fine and normal sinter to determine if chemical or operational changes can be made to reduce the amount of fine sinter formed. This will be achieved through the analysis of real industrial sinter samples and sinter test pot samples. It has been concluded that the production of fine sinter is a direct function of the amount of haematite present in the sinter. Suggestions to decrease the amount of fine sinter formed include: uniform heat distribution during ignition, pO₂ alteration by reductant addition, lower ignition temperature, regulating the cooling regime and decreasing the grain size of lime.

Keywords

IRON ORE SINTER SFCA HAEMATITE MAGNETITE

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References

Bennett

and Oliver

: ‘Proposed methods in XRF analysis of ceramics’,Minerals and Applied Materials, 1992, 67–93

Berry

D. A.

and Lindgren

B. W.

: ‘Statistics: theory and methods’, 461-474; 1990, Pacific Grove, CA, Brooks/Cole Publishing Company.

Dawson

P. R.

, Ostwald

and Hayes

K. M.

: BHP Tech. Bull., 1983, 27, 47–51.

Hamilton

J. D. G.

, Hoskins

B. F.

, Mumme

W. G.

, Borbidge

W. E

and Montague

M. A.

: The crystal structure and crystal chemistry of Ca2-3Mgo-8A11.55i1.1020 (SFCA); solid solutions limits and selected phase relationships of SFCA in the Si02—Fe203—Ca0(—A1203) system’, Neues Jahrbuch Miner. Abh, 1989, 161, (1), 1–26.

Inoue

and Ikeda

: Tetsu-to-Hagane, 1982, 68, 2190–2199.

Kleeberg

and Bergmann

: ‘Quantitative röntgenphasenanalyse mit den rietveldprogrammen BGMN und AUTOQUANT in der täglichen laborpraxis’, Ber. DTTG Greifswald, 1998, 6, 237–250.

Mashao

: Personal communication, 2007.

Mumme

W. G.

, Clout

J. M. F.

and Gable

R. W.

: The crystal structure of SFCA-I Ca3.18Fei: 66Al1 34FC2028, a homologue of the aenigmatite structure type, and new structure type, and new crystal structure refinements of (1-CFF, Ca2.99FeLE30FeO15025 and Mg-free SFCA, Ca2.45Fe44A1124F416Si0.6020’, Neues Jahrbuch Miner. Abh, 1998, 173, (1), 93–117.

Mumme

W. G

: The crystal structure of SFCA-11, Cas.1A19-3FeE2Fe 048 a new homologue of the aenigmatic structure-type, and struc-ture refinement of SFCA-type, Ca2A15Fe2020. Implications for the nature of the ‘ternary-phase solid-solution’ previously reported in the CaO—A1203--iron oxide system’, Neues Jahrbuch Miner. Abh, 2003, 178, (3), 307–335.

10.

Patrick

R. C.

and Lovel

R. R.

: Teaching dicalcium silicates from iron ore sinter to remove phosphorus and other contaminants’, ISIJ Int., 2001, 41, (2), 128–135.

11.

Patrick

T. R. C.

and Pownceby

M. I.

: ‘Stability of silico-ferrite of calcium and aluminum (SFCA) in air-solid solution limits between 1240°C and 1390°C and phase relationships within the Fe203—Ca0—A1203-5i02 (FCAS) system’, Metall Mater. Trans. B, 2002, 33B, 79–89.

12.

Pimenta

H. P.

and Seshadri

: ‘Characterisation of structure of iron ore sinter and its behaviour during reduction at low temperatures’, Ironmaking Steelmaking, 2002, 29, (3), 169–174.

13.

Pownceby

M. I.

and Clout

J. M. F.

: ‘Importance of fine ore chemical composition and high temperature phase relations: applications to iron ore sintering and pelletising’, Miner. Process. Extr. Metall, 2003, 112, 44–51.

14.

Scarlett

N. V. Y.

, Madsen

I. C.

, Pownceby

M. I.

and Christensen

A. N.

: ‘In situ X-ray diffraction analysis of iron ore sinter phases’, J. Appl. Crystallogr., 2004, 37, 262–268.

15.

Watson

J. S.

: ‘Fast, simple method of powder pellet preparation for X-Ray fluorescence analysis’, X-Ray Spectrometry, 1996, 25, 173–174.

16.

Woollacott

L. C.

and Eric

R. H.

: ‘Mineral and metal extraction an overview’, 252; 1994, Johannesburg, South African Institute of Mining and Metallurgy.