Highly crystalline faujasitic zeolites from flyash

Alkaline hydrothermal conversion of fly ash precipitates into zeolites 3: The removal of mercury and lead ions from wastewater

“…[5,8] In this work, the codisposal FA filtrates and fresh FA were converted into zeolite by alkaline hydrothermal treatment with sodium hydroxide (NaOH). [9] The difference in zeolite product obtained from using different FA-derived samples in the synthesis was investigated. The ability of the different zeolites to remove metal ion species from solution, as compared with a commercial synthetic zeolite, was also investigated.…”

Síntese de zeólitas a partir de cinza volante de caldeiras: caracterização física, química e mineralógica

“…Posteriormente, várias patentes e artigos científicos foram produzidos sugerindo diversos métodos de síntese a partir deste material, para obtenção de diversos tipos de zeólitas [18][19][20][21][22][23]. A síntese alcalina a partir de cinza ocorre em três etapas: dissolução, formação de gel e cristalização [5].…”

Multi-Technique Application for Waste Material Detection and Soil Remediation Strategies: The Red Mud Dust and Fly Ash Case Studies

“…This mineral can be synthesized from different source materials and fly ash is one of the most used (Berkgaut & Singer, 1996;Querol et al, 2002;Shih & Chang, 1996;Shigemoto et al, 1993). Numerous methods have been suggested for the zeolite synthesis including hydrothermal reaction (Holler & Wirsching, 1985;Murayama et al, 2002;Querol et al, 1995;1997a;Shih and Chang, 1996;Tanaka et al, 2003), hydrothermal reaction with a fusion pre-treatment (Berkgaut & Singer, 1996;Chang & Shih, 1998;Rayalu et al, 2000;Shigemoto et al, 1993Shigemoto et al, , 1994, molten-salt methods (Park et al, 2000a;2000b), methods employing microwaves (Inada et al, 2005;Katsuki et al, 2001;Querol et al, 1997b;Slangen et al, 1997) and ultrasonic treatments (Belviso et al, 2011;Lie et al 1995;Park et al, 2001;Wang et al, 2008). Distilled water is used in most of the experiments conducted with these different methods, whereas the synthesis of zeolite with seawater is described in very few articles (e.g.…”