The disposal of radioactive ferric floc

N. C. Collier; N. B. Milestone; J. Hill; I. H. Godfrey

doi:10.1016/j.wasman.2006.01.031

The disposal of radioactive ferric floc

N. C. Collier, N. B. Milestone, J. Hill, I. H. Godfrey

Mechanical and Aerospace Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

An iron hydroxide floc is used as treatment for adsorbing low amounts of actinides during nuclear fuel re-processing. This waste is cemented only after pre-treatment with Ca(OH)2. Characterisation of all simulant material has been undertaken using XRD, TGA and SEM/EDS. The floc is a moderately alkaline colloidal slurry containing approximately 15 wt% solids, with the main particulate being an amorphous hydrated iron oxide. The main phase formed during pre-treatment appears to be an X-ray amorphous hydrated calcium-ferrate phase. Embedded within this are small amounts of crystalline Ca(OH)2, calcite, Fe6(OH)12(CO3), Ca6Fe2(SO4)3(OH) 12 · 26H2O and Ca3B2O6, and can form depending on concentrations of Ca(OH)2 and time. Apart from Ca(OH)2 and calcite, none of the crystalline phases detected during pre-treatment are detected when the floc is encapsulated in an OPC/PFA composite cement hydrated for 90 days. The main crystalline phase detected in the hardened wasteform is a solid solution hydrogarnet, Ca3AlFe(SiO4)(OH)8, known as C3(A,F)SH4 in cement chemistry nomenclature. © 2006 Elsevier Ltd. All rights reserved.

Original language	English
Pages (from-to)	769-775
Number of pages	6
Journal	Waste Management
Volume	26
Issue number	7
DOIs	https://doi.org/10.1016/j.wasman.2006.01.031
Publication status	Published - 2006

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title = "The disposal of radioactive ferric floc",

abstract = "An iron hydroxide floc is used as treatment for adsorbing low amounts of actinides during nuclear fuel re-processing. This waste is cemented only after pre-treatment with Ca(OH)2. Characterisation of all simulant material has been undertaken using XRD, TGA and SEM/EDS. The floc is a moderately alkaline colloidal slurry containing approximately 15 wt% solids, with the main particulate being an amorphous hydrated iron oxide. The main phase formed during pre-treatment appears to be an X-ray amorphous hydrated calcium-ferrate phase. Embedded within this are small amounts of crystalline Ca(OH)2, calcite, Fe6(OH)12(CO3), Ca6Fe2(SO4)3(OH) 12 · 26H2O and Ca3B2O6, and can form depending on concentrations of Ca(OH)2 and time. Apart from Ca(OH)2 and calcite, none of the crystalline phases detected during pre-treatment are detected when the floc is encapsulated in an OPC/PFA composite cement hydrated for 90 days. The main crystalline phase detected in the hardened wasteform is a solid solution hydrogarnet, Ca3AlFe(SiO4)(OH)8, known as C3(A,F)SH4 in cement chemistry nomenclature. {\textcopyright} 2006 Elsevier Ltd. All rights reserved.",

author = "Collier, {N. C.} and Milestone, {N. B.} and J. Hill and Godfrey, {I. H.}",

year = "2006",

doi = "10.1016/j.wasman.2006.01.031",

language = "English",

volume = "26",

pages = "769--775",

journal = "Waste Management",

publisher = "Elsevier BV",

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TY - JOUR

T1 - The disposal of radioactive ferric floc

AU - Collier, N. C.

AU - Milestone, N. B.

AU - Hill, J.

AU - Godfrey, I. H.

PY - 2006

Y1 - 2006

N2 - An iron hydroxide floc is used as treatment for adsorbing low amounts of actinides during nuclear fuel re-processing. This waste is cemented only after pre-treatment with Ca(OH)2. Characterisation of all simulant material has been undertaken using XRD, TGA and SEM/EDS. The floc is a moderately alkaline colloidal slurry containing approximately 15 wt% solids, with the main particulate being an amorphous hydrated iron oxide. The main phase formed during pre-treatment appears to be an X-ray amorphous hydrated calcium-ferrate phase. Embedded within this are small amounts of crystalline Ca(OH)2, calcite, Fe6(OH)12(CO3), Ca6Fe2(SO4)3(OH) 12 · 26H2O and Ca3B2O6, and can form depending on concentrations of Ca(OH)2 and time. Apart from Ca(OH)2 and calcite, none of the crystalline phases detected during pre-treatment are detected when the floc is encapsulated in an OPC/PFA composite cement hydrated for 90 days. The main crystalline phase detected in the hardened wasteform is a solid solution hydrogarnet, Ca3AlFe(SiO4)(OH)8, known as C3(A,F)SH4 in cement chemistry nomenclature. © 2006 Elsevier Ltd. All rights reserved.

AB - An iron hydroxide floc is used as treatment for adsorbing low amounts of actinides during nuclear fuel re-processing. This waste is cemented only after pre-treatment with Ca(OH)2. Characterisation of all simulant material has been undertaken using XRD, TGA and SEM/EDS. The floc is a moderately alkaline colloidal slurry containing approximately 15 wt% solids, with the main particulate being an amorphous hydrated iron oxide. The main phase formed during pre-treatment appears to be an X-ray amorphous hydrated calcium-ferrate phase. Embedded within this are small amounts of crystalline Ca(OH)2, calcite, Fe6(OH)12(CO3), Ca6Fe2(SO4)3(OH) 12 · 26H2O and Ca3B2O6, and can form depending on concentrations of Ca(OH)2 and time. Apart from Ca(OH)2 and calcite, none of the crystalline phases detected during pre-treatment are detected when the floc is encapsulated in an OPC/PFA composite cement hydrated for 90 days. The main crystalline phase detected in the hardened wasteform is a solid solution hydrogarnet, Ca3AlFe(SiO4)(OH)8, known as C3(A,F)SH4 in cement chemistry nomenclature. © 2006 Elsevier Ltd. All rights reserved.

U2 - 10.1016/j.wasman.2006.01.031

DO - 10.1016/j.wasman.2006.01.031

M3 - Article

VL - 26

SP - 769

EP - 775

JO - Waste Management

JF - Waste Management

IS - 7

ER -

The disposal of radioactive ferric floc

Abstract

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