NDLI: Immobilisation of Contaminated DEHPA Waste in Portland Cement

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Blagojevic, Ned Vance, Lou Aldridge, Laurie Syed, A. Malik
Copyright Year	2003
Abstract	The immobilisation of organic liquids in cement products can often be difficult when attempts are made to achieve high waste loading. In this work, diethylhexyl phosphoric acid (DEHPA) contaminated with minor amounts of U (1400 ppm), Th (100 ppm) and rare earth elements (17,900 ppm) arising from solvent extraction technology for rare earth extraction from monazite shows promise of immobilisation in ordinary Portland cement (OPC). Waste loadings of up to 50% (v/v) have been achieved at the laboratory scale. The product was allowed to set overnight and had reasonable resistance to leaching after exposure to deionised water (DIW) at 25°C. Centimetre-sized samples released <0.1% of the rare earth and U inventories after exposure to 100 ml of DIW for 7 days. Releases of Ca, Al and Si were comparable with those from DEHPA free OPC. Samples were examined by SEM to determine elemental distribution and assess the porosity. Compressive strengths and detailed leaching behaviour of sample bodies over the temperature range between 25 °C and 50 °C will be presented. Preliminary attempts with geopolymeric materials were less successful than those using cement. The relative merits of immobilisation in cement compared with other possible means of dealing with the contaminated DEHPA are discussed.
Sponsorship	Nuclear Engineering Division and Environmental Engineering Division
Starting Page	1827
Ending Page	1829
Page Count	3
File Format	PDF
ISBN	0791837327
DOI	10.1115/ICEM2003-4771
e-ISBN	0791837319
Volume Number	9th ASME International Conference on Radioactive Waste Management and Environmental Remediation: Volumes 1, 2, and 3
Conference Proceedings	ASME 2003 9th International Conference on Radioactive Waste Management and Environmental Remediation
Language	English
Publisher Date	2003-09-21
Publisher Place	Oxford, England
Access Restriction	Subscribed
Subject Keyword	Water Cements (adhesives) Temperature Porosity
Content Type	Text
Resource Type	Article

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