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Titolo:
FLUORIDE SORPTION AND MINERAL STABILITY IN AN ALBERTA SOIL INTERACTING WITH PHOSPHOGYPSUM LEACHATE
Autore:
LUTHER SM; POULSEN L; DUDAS MJ; RUTHERFORD PM;
Indirizzi:
UNIV ALBERTA,DEPT RENEWABLE RESOURCES,EARTH SCI BLDG,RM 4-42 EDMONTONAB T6G 2E3 CANADA UNIV ALBERTA,DEPT RENEWABLE RESOURCES EDMONTON AB T6G 2E3 CANADA
Titolo Testata:
Canadian Journal of Soil Science
fascicolo: 1, volume: 76, anno: 1996,
pagine: 83 - 91
SICI:
0008-4271(1996)76:1<83:FSAMSI>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
DISSOLUTION KINETICS; ALUMINUM FLUORIDE; SOLUBILITY; MONTMORILLONITE; EQUILIBRIA; RETENTION; WATERS; MODEL; ACIDS; PH;
Keywords:
FLUORIDE; PHOSPHOGYPSUM; WASTE MANAGEMENT; LEACHATES; GEOCHEMICAL MODELING; MINERAL STABILITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
52
Recensione:
Indirizzi per estratti:
Citazione:
S.M. Luther et al., "FLUORIDE SORPTION AND MINERAL STABILITY IN AN ALBERTA SOIL INTERACTING WITH PHOSPHOGYPSUM LEACHATE", Canadian Journal of Soil Science, 76(1), 1996, pp. 83-91

Abstract

A by-product of phosphate fertilizer production is phosphogypsum (PG). Relatively high F concentrations occur in the solid phase and in thehighly acidic process water (PW) that initially fills its pores. The present research addresses the fate of F and the effects on mineral stability as phosphogypsum leachate (PGL) interacts with calcareous (Ck)soil and non-calcareous (Bt) soil. In a sequential batch equilibration, soils were exposed to fresh PGL during 30 d-long extractions. Majorions, pH and electrical conductivity (EC) were monitored. At 28 d, F concentration decreased from 31 mg L(-1) in the PGL to 11 mg L(-1) in the Bt-PGL mixture and 22 mg L(-1) in the Ck-PGL mixture. Saturation indices (SIs) for fluorite ranged from 2.1 to -3.6. Extracts were closer to saturation with fluorite than with the other F minerals studied. Using alternative geochemical constants, fluorapatite was predicted tobe stable in Bt-PGL extracts. The day 28 Bt-PGL extract was also nearequilibrium with alunite, basaluminite, jurbanite, gypsum, amorphous silica, and quartz. Of the phyllosilicates in the soil-PGL mixtures atday 28, only kaolinite was predicted to be stable in only the Bt-PGL mixture. The potential for clay mineral instability and accelerated dissolution in F-rich PGL needs to be considered in the design of PG repositories.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/12/20 alle ore 15:40:28