Characterisation of dense gypsum slude from waste acid

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dc.contributor.authorHalim, CEen_AU
dc.contributor.authorBickert, Gen_AU
dc.contributor.authorAmal, Ren_AU
dc.date.accessioned2024-05-07T01:21:13Zen_AU
dc.date.available2024-05-07T01:21:13Zen_AU
dc.date.issued2001-09-23en_AU
dc.date.statistics2002-09en_AU
dc.descriptionCD-Rom held by ANSTO Library at 660.20994/15en_AU
dc.description.abstractThe treatment of acid waste liquors is often carried out in a conventional neutralisation circuit using lime as reagent. The High Density Sludge (HDS) process improves this technology by recycling conditioned thickener underflow to modify the precipitate particle formation, leading to an increase in the density of the settled solids. The treatment of sulphuric acid was examined using conventional lime treatment and the HDS process, in both batch and continuous mode. The HDS process produced sludge of significantly higher density than the conventional process. Particle size analysis of the solids indicated some variation between conventional and HDS solids. Particle chord length distribution and SEM examination indicated no change in particle shape. Both precipitates exhibited a flat leaf type shape. There was little difference between the conventional and HDS solids from XRD analysis, which indicated a gypsum (CaSO4.2H2O) crystal form. The results suggest that for gypsum, the HDS process alters the particle structure by removing free water molecules, giving a more compact sludge of higher density. This seems to be partially achieved by shearing of the gypsum particles in the conditioning tank, causing compaction of the gypsum sludge. © The Authors.en_AU
dc.identifier.booktitle6th World Congress of Chemical Engineering, Melbourne 2001: proceedingsen_AU
dc.identifier.citationHalim, C. E., Bickert, G., & Amal, R. (2001). Characterisation of dense gypsum slude from waste acid. Paper presented to the The 6th World Congress of Chemical Engineering, September 23–27, 2001, Melbourne, Australia. In 6th World Congress of Chemical Engineering, Melbourne 2001: proceedings.en_AU
dc.identifier.conferenceenddate2001-09-28en_AU
dc.identifier.conferencename6th World Congress of Chemical Engineeringen_AU
dc.identifier.conferenceplaceMelboure, Australiaen_AU
dc.identifier.conferencestartdate2001-09-23en_AU
dc.identifier.otherPaper 1041en_AU
dc.identifier.placeofpublicationMelbourne, Victoriaen_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15583en_AU
dc.language.isoenen_AU
dc.publisherInstitution of Chemical Engineers in Australiaen_AU
dc.subjectGypsumen_AU
dc.subjectSludgesen_AU
dc.subjectWastesen_AU
dc.subjectReagentsen_AU
dc.subjectRecyclingen_AU
dc.subjectAcid sulfatesen_AU
dc.subjectParticlesen_AU
dc.subjectSeparation processesen_AU
dc.titleCharacterisation of dense gypsum slude from waste aciden_AU
dc.typeConference Paperen_AU
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