Processing of Latvian silicate waste into glass-ceramics by powder technology and sintering

Author： Rozenstrauha I. Wu J. P. Boccaccini A. R.

ISSN： 0017-1050

Source： Glass Technology - European Journal of Glass Science and Technology Part A, Vol.46, Iss.3, 2005-06, pp. : 248-254

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Abstract

The results of an investigation on the production of glass-ceramic materials from various combinations of Latvian inorganic industrial wastes (peat ash and waste glass) and metallurgical iron containing wastes (steel cooling refuse and etching refuse) are reported. The sintering capability of steel cooling refuse in fine powder form, a residue containing high concentration of iron (∼ 90 wt% of iron oxide), was also investigated. The optimisation of the sintering behaviour of mixtures made from the mentioned wastes with clay additions, as well as of the powdered steel cooling refuse, was carried out in the temperature range from 980 to 1300°C. The thermal behaviour, mineralogical and chemical composition, and microstructural characteristics of sintered products were determined. The glass-ceramics obtained have a dense crystalline structure with sintered densities up to 95% of theoretical density. The Vickers' hardness was measured to be 6·1±0·3 GPa for the composition with the highest clay addition (25 wt%), only slightly higher than the hardness of the glass-ceramic with high concentration of steel cooling refuse 5·9±0·4 GPa. The glass-ceramic materials showed relatively high fracture strength values, which were determined using the Brazilian disc test. The values varied between 36 and 55 MPa, depending on composition. The materials produced have potential as building materials for applications such as industrial floors and external wall tiles.