SYNTHESIS AND CHARACTERIZATION OF GREENER CERAMIC MATERIALS WITH LOWER THERMAL CONDUCTIVITY USING OLIVE MILL SOLID BYPRODUCT

Xenofon Spiliotis,Stylianos Lamprakopoulos,Konstantinos Ntampegliotis,George Papapolymerou,Vayos Karayannis

doi:10.21303/2461-4262.2020.001116

Xenofon Spiliotis, Stylianos Lamprakopoulos + Show 3 more

Open Access

https://doi.org/10.21303/2461-4262.2020.001116

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Abstract

In the current research, the valorization of olive mill solid waste as beneficial admixture into clay bodies for developing greener ceramic materials with lower thermal conductivity, thus with increased thermal insulation capacity towards energy savings, is investigated. Various clay/waste mixtures were prepared. The raw material mixtures were characterized and subjected to thermal gravimetric analysis, in order to optimize the mineral composition and maintain calcium and magnesium oxides content to a minimum. Test specimens were formed employing extrusion and then sintering procedure at different peak temperatures. Apparent density, water absorption capability, mechanical strength, porosity and thermal conductivity were determined on sintered specimens and examined in relation to the waste percentage and sintering temperature. The experimental results showed that ceramic production from clay/olive-mill solid waste mixtures is feasible. In fact, the mechanical properties are not significantly impacted with the incorporation of the waste in the ceramic body. However, the thermal conductivity decreases significantly, which can be of particular interest for thermal insulating materials development. Furthermore, the shape of the produced ceramics does not appear to change with the sintering temperature increase.

Highlights

IntroductionInnovative technologies that incorporate different forms of biomass and other alternative solid products (produced from various waste treatments) into red ceramics seem to develop rapidly at a global level
Innovative technologies that incorporate different forms of biomass and other alternative solid products into red ceramics seem to develop rapidly at a global level
Mechanical Strength (Modulus of Rupture – MOR) In Fig. 7, the dependence of mechanical strength calculated in terms of modulus of rupture (MOR) upon three-point bend testing of the specimens on the OSWR percentage in the clay/OSWR mixtures is presented

Summary

Introduction

Innovative technologies that incorporate different forms of biomass and other alternative solid products (produced from various waste treatments) into red ceramics seem to develop rapidly at a global level. The interesting points in these technologies are that they: a) can act as an efficient disposal method; b) exploit the biomass energy content into clay bodies for fuel savings; c) use of materials with organic matter as pore-forming agents [4, 5]. Olive-mill solid waste is the main waste produced during the process of olive-pomace oil production. In Greece, approximately 250,000 tons of (olive stone wooden residue (OSWR) are produced annually [6, 7]. OSWR is mainly used as alternative fuel due to its high calorific value (18,828–20,577 MJ/Kg) [8, 9]

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