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Titolo:
WEATHERING OF CLAY-MINERALS INDUCED BY FLUORIDE-CONTAINING SOLUTIONS FROM PHOSPHOGYPSUM BY-PRODUCT
Autore:
AROCENA JM; DUDAS MJ; POULSEN L; RUTHERFORD PM;
Indirizzi:
UNIV ALBERTA,DEPT RENEWABLE RESOURCES EDMONTON AB T6G 2E3 CANADA UNIV ALBERTA,DEPT RENEWABLE RESOURCES EDMONTON AB T6G 2E3 CANADA UNIV NO BRITISH COLUMBIA,FAC NAT RESOURCES & ENVIRONM STUDIES PRINCE GEORGE BC V2N 4Z9 CANADA
Titolo Testata:
Canadian Journal of Soil Science
fascicolo: 2, volume: 75, anno: 1995,
pagine: 219 - 226
SICI:
0008-4271(1995)75:2<219:WOCIBF>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
DISSOLUTION; ALUMINUM; KINETICS;
Keywords:
CLAY LINERS; LANDFILLS; DISSOLUTION; WASTE MANAGEMENT; LEACHATES; GEOCHEMICAL REACTIONS; MINERAL STABILITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
29
Recensione:
Indirizzi per estratti:
Citazione:
J.M. Arocena et al., "WEATHERING OF CLAY-MINERALS INDUCED BY FLUORIDE-CONTAINING SOLUTIONS FROM PHOSPHOGYPSUM BY-PRODUCT", Canadian Journal of Soil Science, 75(2), 1995, pp. 219-226

Abstract

The production of phosphate fertilizer from phosphate rock results inthe formation of phosphogypsum (PG) and HF. Soluble F- ends up in process water and in the pore space of the PG by-product. This study determined changes in the amount, properties and mineral composition of soil clay upon reaction with acidic PG solutions. Calcareous and non calcareous soils were reacted with PG leachates (PG-L, 30 mg F- L(-1)) and process water (PG-PW, 6070 mg F- L(-1)) using a sequential batch equilibration method. Phosphogypsum-L did not alter the clay fraction as much as PG-PW, which dissolved as much as two-thirds of the clay fraction. Phosphogypsum-PW reduced surface area of clay fractions from about 500 to 150 m(2) g(-1); Cation exchange capacity CEC was decreased from about 60 to 17 cmol, kg(-1) clay. Reduction in surface area and CECin PG-PW treated soil corresponded to near complete dissolution of smectite and a negative enrichment of mica. Kaolinite in coarse clay of the PG-PW treatment was reduced to 20% of the control and was completely destroyed in fine clay fractions. Amorphous silica was produced from the F--induced dissolution of clay. The results indicate there is likely to be considerable alteration of minerals in subsoils beneath PG waste repositories and of clay liners used at some storage facilities.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/12/20 alle ore 15:52:07