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Magnetic Properties of Low-Ca Fly Ash: A Rapid Tool for Fe-Assessment and a Survey for Potentially Hazardous Elements

Published online by Cambridge University Press:  15 February 2011

M.J. Dekkers  and
H.S. Pietersen
M.J. Dekkers
Affiliation:
Paleomagnetic Laboratory ‘Fort Hoofddijk’, Institute for Earth Sciences, University of Utrecht, Budapestlaan 17, 3584 CD Utrecht, The Netherlands
H.S. Pietersen
Affiliation:
Delft Technical University, Faculty of Civil Engineering, Department of Mechanics and Constructions, Section Materials Science, Stevinweg 1, P.O. Box 5048, 2628 CN Delft, The Netherlands
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Abstract

Between 20 and 50 per cent of the total iron in low-Ca fly ashes resides in low-substitution magnetite spinel with Curie temperatures in between 565 and 590°C. A TEM study reveals that the spinel consists of aggregates of closely spaced spherules of 10 – 30 nm in diameter, which is in complete agreement with rock magnetic determinations. The low-field magnetic susceptibility correlates extremely well with total iron and fairly well with specific heavy metals. Measurement of the magnetic susceptibility may serve as a rapid tool for the evaluation of the speciation of these heavy metals in fly ash.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 245: Symposium K – Advanced Cementitious Systems: Mechanisms and Properties , 1991 , 37
Copyright
Copyright © Materials Research Society 1992

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References

REFERENCES

1. O'Reilly, W., Rock and Mineral Magnetism (Blackie Publishers, 220 pp, 1984).10.1007/978-1-4684-8468-7CrossRefGoogle Scholar
2. Hulett, L.D., Weinberger, A.J., Northcutt, K.J. and Ferguson, M., Science 210. 1356–1358 (1980).10.1126/science.210.4476.1356CrossRefGoogle Scholar
3. Lauf, R.D., Harris, L.A. and Rawlston, S.S., Environ. Sci. Technol. 16 218–220 (1982).10.1021/es00098a009Google Scholar
4. Farrell, C.W., Hover, K.C. and Plumley, P.W., Cem. Concr. Res. 21, 498–495 (1991).10.1016/0008-8846(91)90098-3Google Scholar
5. Thompson, R. and Oldfield, F., Environmental Magnetism (Allen and Unwin, 227pp. (1986).10.1007/978-94-011-8036-8Google Scholar
6. Day, R., Fuller, M. and Schmidt, V.A., Phys. Earth Planet. Inter. 13. 260–267 (1977).10.1016/0031-9201(77)90108-XGoogle Scholar
7. Pietersen, H.S., Fraay, A.L.A. and Bijen, J.M., MRS Sym. Proc. Vol178 139–157 (1990).10.1557/PROC-178-139Google Scholar
8. Pietersen, H.S., Pers, N.M. van der, Keijser, Th.H. de and Bijen, J.M., in preparation, (1992).Google Scholar
9. Mullender, T.A.T., Velzen, A.J. van and Dekkers, M.J., Geophys. J. Int., submitted (1992).Google Scholar
10. Theis, T.L. and Wirth, J.L., Environ. Sci. Technol. 12, 1096–1100 (1977).10.1021/es60135a006CrossRefGoogle Scholar
11. Hulett, L.D., Weinberger, A.J., Ferguson, N.M., Northcutt, K.J. and Lyon, W.S., EA 1822, Final Report Research Project 1061, 1981.Google Scholar
12. Schwertmann, U., in Iron in Soils and Clay Minerals edited by Stucki, J.W., Goodman, B.A. and Schwertmann, U., NATO ASI Series C Vol 217 (Reidel Publishing Company, Dordrecht/Boston/Lancaster/Tokyo, 1988) p.203–250.10.1007/978-94-009-4007-9_9Google Scholar
13. Heider, F. and Dunlop, D.J., Phys. Earth Planet. Inter. 46, 24–45 (1987).10.1016/0031-9201(87)90169-5CrossRefGoogle Scholar
14. Smit, J. and Wijn, H.P.J., Ferrites (Philips' Technical Library, 369 pp., 1959).Google Scholar
15. Bozorth, R.M., Ferromagnetism (van Nostrand Company, Inc, 968 pp., 1951).Google Scholar
16. Berkowitz, N., An Introduction to Coal Technology (Academic Press, New York, San Francisco, London, 345 pp., 1979).Google Scholar
17. Garrels, R.M. and Christ, C.L., Solutions. Minerals and Equilibria (Harper and Row, 1965).Google Scholar
18. Collinson, D.W., Methods in Rock Magnetism and Palaeomagnetism (Chapman and Hall, London New York, 503 pp, 1983).10.1007/978-94-015-3979-1Google Scholar
19. Hansen, L.D. and Fisher, G.L., Environ. Sci. Technol. 14, 1111–1117 (1980).10.1021/es60169a015Google Scholar