Carbon Dioxide → Magnesium bicarbonate

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Reaction Steps

Sodium hydroxide (30%) is added into a magnesium nitrate solution (5.0 mol/L, MgO content: 200 g/L) at a molar ratio of sodium to magnesium of 2. Controlling the reaction for 25 minutes at 20° C., a magnesium hydroxide slurry can be obtained. After filtration, a filter cake of magnesium hydroxide is obtained. Then water is added into the filter cake to prepare slurry at a weight ratio of water to magnesium oxide of 30:1. After that, carbon dioxide (90 vt %) is introduced into the slurry to carry out carbonation at 25° C. Subsequently, a magnesium bicarbonate solution (MgO: 30 g/L, Fe: 0.3 ppm, Al: 0.4 ppm) is obtained after clarification and filtration.

Provenance & Evidence