Carbon Dioxide → Magnesium bicarbonate

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Reaction Steps

A mixture of magnesium oxide and calcium oxide, prepared from calcination of dolomite at 900° C. for 2 hours, is hydrated for 5 hours at 50° C. The weight ratio of water to magnesium/calcium oxide is 5:1. Then water is added into the mixture to prepare slurry at a weight ratio of water to magnesium/calcium oxide of 190:1. After that, carbon dioxide (75 vt %) is introduced into the slurry to react for 2 hours at 25° C. Subsequently, a pure aqueous solution of magnesium bicarbonate and calcium bicarbonate (MgO+CaO (90 wt % MgO): 5.1 g/L, Fe: 1.1 ppm, Al: 0.7 ppm) is obtained after clarification and filtration.

Provenance & Evidence