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PHOSPHOGYPSE [1 record]

Record 1 2006-08-16

English

Subject field(s)
  • Natural Construction Materials
  • Nuclear Waste Materials
  • Soil Improvement and Fertilizer Management
DEF

A gypsum produced in the manufacture of phosphoric acid and used in cement.

CONT

In the past, the phosphate fertilizer industry was the largest generator of incidental waste in Ontario, producing about 900,000 cu.m. per year of naturally-contaminated phosphogypsum waste. Phosphogypsum results from the chemical treatment of phosphate rock and contains low concentrations of uranium and radium, which render it unsuitable for unrestricted use.

CONT

Large quantities of impure calcium sulphate (phosphogypsum) are produced in the wet process; small amounts of this are used as a soil conditioner in the U.S.A., but the remainder constitutes a major disposal problem.

French

Domaine(s)
  • Matériaux de construction naturels
  • Déchets nucléaires
  • Fumure et amélioration du sol
DEF

Sous-produit de la fabrication de l'acide phosphorique, résultant de l'attaque sulfurique d'un phosphate naturel.

CONT

De vastes quantités de sulfates de calcium impurs (phosphogypse) sont produites par le procédé humide; de petites quantités de ce produit sont directement utilisées comme conditionneur de sol aux États-Unis, mais le reste constitue un important problème d'élimination.

OBS

De structure analogue à celle du gypse naturel, le phosphogypse est valorisé grâce à certains traitements et sert à fabriquer du plâtre, surtout dans les pays n'ayant pas de gypse naturel, comme le Japon.

Spanish

Campo(s) temático(s)
  • Materiales de construcción naturales
  • Desechos nucleares
  • Abono y mejoramiento del suelo
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