Using marble and granite rejects to enhance the processing of clay products
authors Segadaes, AM; Carvalho, MA; Acchar, W
nationality International
author keywords ceramic tiles; ornamental stones; recycling; phase equilibrium
abstract The heterogeneity of traditional clay-based materials accommodates a variety of waste products compositions with little sacrifice of the final product properties and a much welcome relief on waste disposal concerns. Hence, the incorporation of industrial wastes or sub-products in bricks and tiles is becoming common practice. However, the continued depletion of natural resources throws new light on the potential use of some industrial wastes and natural sub-products as full-fledged alternative ceramic raw materials. This work shows the changes in properties of an industrial red-clay-based mixture, already in use in the production of floor tiles, due to additions of an ornamental stone cutting reject (marble and granite). Samples containing up to 30 wt.% reject were uniaxially pressed and sintered in air in an electric furnace (1100-1150 degrees C, for 2 h). The results obtained (X-ray diffraction and fluorescence, thermal analysis, firing shrinkage, water absorption and mechanical strength), explain the effect that the marble and granite reject additions have on the clay mixture behaviour and show how the properties of the sintered red-clay products can be improved, with the possibility of using lower firing temperatures. (c) 2005 Elsevier B.V. All rights reserved.
issn 0169-1317
year published 2005
volume 30
issue 1
beginning page 42
ending page 52
digital object identifier (doi) 10.1016/j.clay.2005.03.004
web of science category Chemistry, Physical; Materials Science, Multidisciplinary; Mineralogy
subject category Chemistry; Materials Science; Mineralogy
unique article identifier WOS:000231331300005
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journal impact factor 4.605
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