Abstract

A novel slurry recirculating reactor was designed to selectively leach caustic-calcined magnesia into soluble magnesium bicarbonate with CO 2 as the leaching reagent. Compared with the reactor without slurry recirculating, the leaching rate of magnesia could be enhanced by 80%–90% in this reactor. Parameters including mass concentration of the magnesia slurry, flowrate of slurry recirculating, injection rate of CO 2 and temperature were studied with respect to their effects on the leaching kinetics. A fast leaching of caustic-calcined magnesia could be achieved with a high CO 2-consuming efficiency of 65–70% in this reactor.

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