Method for removing silica from evaporator concentrate

Details Method for removing silica from evaporator concentrate Method for removing silica from evaporator concentrate

C - Chemistry, Metallurgy

02

F

C02F 1/52 (2006.01) C02F 1/04 (2006.01) C02F 1/60 (2006.01) C10G 31/09 (2006.01) E21B 43/40 (2006.01) C01B 33/12 (2006.01)

Patent

CA 2707011

A method for removing silica from evaporator concentrate to facilitate disposal of the concentrate. An alkaline earth compound is mixed with the concentrate in a crystallizer. Silica in the concentrate reacts with the alkaline earth compound and precipitates from the concentrate as alkaline silicate complexes. The concentrate having the alkaline earth silicate complexes is directed to a separator where the alkaline earth silicate complexes are separated from the concentrate, producing an aqueous solution and slurry. The slurry is directed to a filter where solids are separated from a filtrate. Both the aqueous solution and the filtrate can be disposed of by deep well injection.

La présente invention concerne un procédé destiné à éliminer la silice d'un concentrat d'évaporation afin de faciliter le rejet du concentrat. Un composé alcalino-terreux est mélangé avec le concentrat dans un cristallisoir. La silice dans le concentrat réagit avec le composé alcalino-terreux et précipite à partir du concentrat sous forme de complexes de silicate alcalins. Le concentrat contenant les complexes de silicate alcalino-terreux est dirigé vers un séparateur dans lequel les complexes de silicate alcalino-terreux sont séparés du concentrat, produisant une solution aqueuse et une boue. La boue est dirigée vers un filtre dans lequel les solides sont séparés d'un filtrat. A la fois la solution aqueuse et le filtrat peuvent être rejetés par injection des déchets en profondeur.

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