Obtaining zeolites from slags and ashes from a waste combustion plant in an autoclave process

Abstract

Abstract. Waste combustion is associated with the generation of postprocessing solid products -waste such as slag and ash. One of the promising technologies in waste management and processing is the synthesis of zeolites and other materials exhibiting sorption properties. The aim of this study was to characterise and assess the physicochemical properties of the waste and the products synthesised from it. This paper presents the possibility of synthesis zeolites from the slag and ash from two waste combustion plants. The investigated waste is classified as hazardous waste and denoted by the EWC code 190111*. The paper presents the results of physicochemical studies of these materials. As a result of synthesis in an autoclave at 140°C with the use of 2 M NaOH, and other compounds, such zeolite forms as chabazite and sodalite were obtained. Textural studies and ion-exchange capacity investigations carried out allowed characterisation of the sorption properties of the materials. It was found that the materials obtained are characterised by the BET specific surface areas of 25.45 m 2 /g and 16.79 m 2 /g.

Effect of Zeolite on the Compaction Properties and California Bearing Ratio (CBR) of Cemented Sand

“…Yukselen-Aksoy [11] found that zeolites are mechanically stable and are appropriate for use in landfill liner and embankment materials. Grela et al [12] showed that zeolite can also be received from waste materials such as fly ashes. The use of zeolite can reduce the unavoidable environmental issues associated with the production of cement such as CO 2 release and consumption of energy.…”