A process for the treatment of effluent streams

Details A process for the treatment of effluent streams A process for the treatment of effluent streams

C - Chemistry, Metallurgy

02

F

C02F 1/52 (2006.01)

Patent

CA 2292582

This invention relates to a process for removing sulphates and calcium from a water stream which comprises the steps of: combining the water stream and an amount of amorphous aluminium trihydroxide (Al(OH3)); allowing the formation of ettringite (3CaO.Al2O3CaSO4.31/32H2O) as a precipitate; and removing the precipitated ettringite from the water stream.

L'invention concerne un procédé d'élimination des sulfates et du calcium d'un effluent. Ce procédé consiste: à ajouter à cet effluent une quantité d'hydroxyde d'aluminium amorphe (Al(OH¿3?)); à permettre la formation d'ettringite (3CaO.Al¿2?O¿3?CaSO¿4?.31/32H¿2?O) sous la forme d'un précipité; et à éliminer l'ettringite ainsi précipitée dudit effluent.

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