The use of residues in the clay-based ceramic composition for the production of
ceramics has been widely studied, since a significant improvement in the chemical and
physical properties of the final materials has been observed. The aim of this work is to
evaluate the influence of the incorporation of 5 and 10 wt. % of blast furnace sludge
into the clay slag, both from the state of Pará. The raw material and the waste were
initially benefited in order to reduce the particle size and subsequently passed through a
sieve with a mesh opening equal to #325. After this step, the residue and the raw
material were submitted to FRX, EDS, XRD, TG / DTG, particle size distribution, MO,
SEM and determination of plasticity and liquidity limits. Test specimens were prepared
by uniaxial pressing of 20 Mpa for burning in a muffle-type laboratory oven at
temperatures of 750, 850 and 950oC. MEA, PA, AA, RLQ and three-point flexural
strength were evaluated. The microstructure of the burnt ceramics was evaluated by
OM, MEV and XRD. The results showed that the blast furnace slurry consists
predominantly of iron compounds, which contributes to the reddish placement in the
sintered part. The residue presents a granulometry favorable to the addition in clayey
mass, not altering the technological properties. Thus, it was concluded that the
composition with addition of 5% of blast furnace sludge was the one that presented
favorable results and required by standards for the manufacture of tiles.
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