Solubility of zinc silicate and zinc ferrite in aqueous solution to high temperatures

Donald A. Palmer; Lawrence M. Anovitz

doi:10.1007/s10953-009-9418-z

Solubility of zinc silicate and zinc ferrite in aqueous solution to high temperatures

Donald A. Palmer, Lawrence M. Anovitz

Geochemistry & Interfacial Science

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

10 Scopus citations

Abstract

Crystalline zinc silicate, Zn₂SiO₄, and zinc ferrite, ZnFe₂O₄, were prepared and characterized. The solubilities of these phases were measured using flow-through apparatus from 50 to 350∈°C in 100∈°C intervals over a wide range of pH. Both solid phases dissolve incongruently, presumably to form ZnO(s) and Fe ₂O₃(s) (or the corresponding hydroxide phases at low temperature), respectively. The respective concentrations of zinc(II) and iron(III) matched those of ZnO(cr) and Fe₂O₃(s) (≥ 150 °C) reported in the literature, whereas the corresponding Si(IV) and Zn(II) concentrations were at least an order of magnitude below the solubility limits for their pure oxide phases. Therefore, the solubility constants for zinc silicate and ferrite were determined with respect to the known solubility constants for ZnO(cr) and Fe₂O₃(s) (≥ 150 °C), respectively, and the corresponding concentrations of Si(IV) and Zn(II) measured in this study. The results of independent experiments, as well as those reported in the literature provide insights into the mechanism(s) of formation of zinc silicate and ferrite in the primary circuits of nuclear reactors.

Original language	English
Pages (from-to)	869-892
Number of pages	24
Journal	Journal of Solution Chemistry
Volume	38
Issue number	7
DOIs	https://doi.org/10.1007/s10953-009-9418-z
State	Published - Jul 2009

Funding

Acknowledgements Financial support for this work was provided by EPRI, Palo Alto, California, USA under the supervision of Dr. B. Cheng. Special thanks are due to Ms. T.J. Keever and Ms. L.L. Wilson (Chemical Sciences Division of ORNL) who carried out the AA, GFAA and ICPMS analyses.

Funders	Funder number
Electric Power Research Institute

Keywords

Aqueous solution
BWR
Hematite
High temperature
Incongruent dissolution
Meissner model
PWR
Solubility
Zinc ferrite
Zinc oxide
Zinc silicate

Access to Document

10.1007/s10953-009-9418-z

Cite this

@article{7199db25f888414a9d6e18c1b24fce99,

title = "Solubility of zinc silicate and zinc ferrite in aqueous solution to high temperatures",

abstract = "Crystalline zinc silicate, Zn2SiO4, and zinc ferrite, ZnFe2O4, were prepared and characterized. The solubilities of these phases were measured using flow-through apparatus from 50 to 350∈°C in 100∈°C intervals over a wide range of pH. Both solid phases dissolve incongruently, presumably to form ZnO(s) and Fe 2O3(s) (or the corresponding hydroxide phases at low temperature), respectively. The respective concentrations of zinc(II) and iron(III) matched those of ZnO(cr) and Fe2O3(s) (≥ 150 °C) reported in the literature, whereas the corresponding Si(IV) and Zn(II) concentrations were at least an order of magnitude below the solubility limits for their pure oxide phases. Therefore, the solubility constants for zinc silicate and ferrite were determined with respect to the known solubility constants for ZnO(cr) and Fe2O3(s) (≥ 150 °C), respectively, and the corresponding concentrations of Si(IV) and Zn(II) measured in this study. The results of independent experiments, as well as those reported in the literature provide insights into the mechanism(s) of formation of zinc silicate and ferrite in the primary circuits of nuclear reactors.",

keywords = "Aqueous solution, BWR, Hematite, High temperature, Incongruent dissolution, Meissner model, PWR, Solubility, Zinc ferrite, Zinc oxide, Zinc silicate",

author = "Palmer, {Donald A.} and Anovitz, {Lawrence M.}",

year = "2009",

month = jul,

doi = "10.1007/s10953-009-9418-z",

language = "English",

volume = "38",

pages = "869--892",

journal = "Journal of Solution Chemistry",

issn = "0095-9782",

publisher = "Springer",

number = "7",

}

TY - JOUR

T1 - Solubility of zinc silicate and zinc ferrite in aqueous solution to high temperatures

AU - Palmer, Donald A.

AU - Anovitz, Lawrence M.

PY - 2009/7

Y1 - 2009/7

N2 - Crystalline zinc silicate, Zn2SiO4, and zinc ferrite, ZnFe2O4, were prepared and characterized. The solubilities of these phases were measured using flow-through apparatus from 50 to 350∈°C in 100∈°C intervals over a wide range of pH. Both solid phases dissolve incongruently, presumably to form ZnO(s) and Fe 2O3(s) (or the corresponding hydroxide phases at low temperature), respectively. The respective concentrations of zinc(II) and iron(III) matched those of ZnO(cr) and Fe2O3(s) (≥ 150 °C) reported in the literature, whereas the corresponding Si(IV) and Zn(II) concentrations were at least an order of magnitude below the solubility limits for their pure oxide phases. Therefore, the solubility constants for zinc silicate and ferrite were determined with respect to the known solubility constants for ZnO(cr) and Fe2O3(s) (≥ 150 °C), respectively, and the corresponding concentrations of Si(IV) and Zn(II) measured in this study. The results of independent experiments, as well as those reported in the literature provide insights into the mechanism(s) of formation of zinc silicate and ferrite in the primary circuits of nuclear reactors.

AB - Crystalline zinc silicate, Zn2SiO4, and zinc ferrite, ZnFe2O4, were prepared and characterized. The solubilities of these phases were measured using flow-through apparatus from 50 to 350∈°C in 100∈°C intervals over a wide range of pH. Both solid phases dissolve incongruently, presumably to form ZnO(s) and Fe 2O3(s) (or the corresponding hydroxide phases at low temperature), respectively. The respective concentrations of zinc(II) and iron(III) matched those of ZnO(cr) and Fe2O3(s) (≥ 150 °C) reported in the literature, whereas the corresponding Si(IV) and Zn(II) concentrations were at least an order of magnitude below the solubility limits for their pure oxide phases. Therefore, the solubility constants for zinc silicate and ferrite were determined with respect to the known solubility constants for ZnO(cr) and Fe2O3(s) (≥ 150 °C), respectively, and the corresponding concentrations of Si(IV) and Zn(II) measured in this study. The results of independent experiments, as well as those reported in the literature provide insights into the mechanism(s) of formation of zinc silicate and ferrite in the primary circuits of nuclear reactors.

KW - Aqueous solution

KW - BWR

KW - Hematite

KW - High temperature

KW - Incongruent dissolution

KW - Meissner model

KW - PWR

KW - Solubility

KW - Zinc ferrite

KW - Zinc oxide

KW - Zinc silicate

UR - http://www.scopus.com/inward/record.url?scp=67349218407&partnerID=8YFLogxK

U2 - 10.1007/s10953-009-9418-z

DO - 10.1007/s10953-009-9418-z

M3 - Article

AN - SCOPUS:67349218407

SN - 0095-9782

VL - 38

SP - 869

EP - 892

JO - Journal of Solution Chemistry

JF - Journal of Solution Chemistry

IS - 7

ER -

Solubility of zinc silicate and zinc ferrite in aqueous solution to high temperatures

Abstract

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Cite this