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Volumen II - SAM

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Diametral shrinkage (%)<br />

4. CONCLUSIONS<br />

3,0<br />

2,5<br />

2,0<br />

1,5<br />

1,0<br />

0,5<br />

0,0<br />

-0,5<br />

-1,0<br />

Aclay<br />

Bclay<br />

0 5 10 15 20<br />

EAFD (wt.%)<br />

Figure 4. Diametral shrinkage of the elaborated compositions fired at 850 o C.<br />

In this work, the evaluation of the incorporation of an electric arc furnace dust waste from steel-making plant<br />

into clayey ceramics used for civil construction, led to the following conclusions:<br />

• The electric arc furnace dust is predominantly composed of Fe, Na and Zn compounds that act as a nonplastic<br />

material during the forming stage of the ceramics by reducing the plasticity of the clayey body. In the<br />

case of high plastic clays, such as the Bclay, this may be an advantage by adjusting its workability.<br />

• The waste interferes in the physical and mechanical strength of the fired ceramic as a function its<br />

mineralogical and chemical composition. It was observed that with flux clay, the waste promoted a better<br />

effect on the decrease of the porosity. With respect to the mechanical strength, quartz particles, normally<br />

present in the clays, displays important role.<br />

ACKNOWLEDGEMENTS<br />

Authors want to thank the supports provided by:<br />

-Brazilian Agencies: FAPERJ, proc. n. E-26/103.023/2008, and CNPq, proc. n. 306027/2008-9.<br />

-National Agency of Scientific and Technological Promotion – ANPCyT. PICT Raíces Nº 35672.<br />

(Argentina).<br />

REFERENCES<br />

1. H.T. Makkonen, J. Heino, L. Laitila, A. Hiltunen, E. Pöyliö and J. Häkki, “Optimization of steel plant<br />

recycling in Finland: dust, scales and sludge”, J. Resources, Conservation and Recycling, Vol. 35 (2002),<br />

p. 77-84.<br />

2. B. Das, S. Prakash, P.S.R. Reddy and V.N. Misra, “An overview of utilization of slag and sludge from<br />

steel industries”, Resources, Conservation & Recycling, Vol. 50 (2007), p.40-57.<br />

3. T. Sofilié, A. Rastovcan-Mioe, S. Cerjan-Stefanovic, V. Novosel-Radovic and M. Jenko,<br />

“characterization of steel mill electric-arc furnace dust”, Journal of Hazardous Materials B, Vol. 109<br />

(2004), p. 59-70.<br />

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