Utilization of oil shale combustion wastes for PCC production: Quantifying the kinetics of Ca(OH)2 and CaSO4·2H2O dissolution in aqueous systems

Autor:	Olga Velts-Jänes, Juha Kallas, Mai Uibu, Priit Kallaste, Kadriann Tamm, Rein Kuusik
Rok vydání:	2015
Předmět:	Aqueous solution Chemistry General Chemical Engineering Kinetics Energy Engineering and Power Technology engineering.material Combustion Portlandite Fuel Technology Chemical engineering Leaching (chemistry) engineering Dissolution Oil shale Lime
Zdroj:	Fuel Processing Technology. 140:156-164
ISSN:	0378-3820
DOI:	10.1016/j.fuproc.2015.09.010
Popis:	The ash produced during oil shale combustion is classified as waste, however, one could also view it as a low-cost source of lime for the abatement of SO 2 and CO 2 emissions as well as for the commercial production of precipitated calcium carbonate (PCC)-type filler material. This study focuses on the dissolution mechanisms of the main water-soluble calcium species in oil shale ash–water systems. Reaction models that describe the dissolution of Ca(OH) 2 and CaSO 4 ·2H 2 O in water were developed and the kinetic parameters of the proposed system composed of differential equations were estimated by optimizing the model reproduction of experimental data. The dissolution kinetics of Ca(OH) 2 and CaSO 4 ·2H 2 O were also simulated using the Aspen Plus process modeling platform.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::122a1a110a5680f0951cb80bec50d3af https://doi.org/10.1016/j.fuproc.2015.09.010 Zobrazit plný text záznamu Full Text from ScienceDirect