Systems of Producing Calcium and Magnesium Carbonate from the Ca/Mg Containing Solution Leached by a CO2-based Hydrometallurgical Process

A system for producing calcium and magnesium carbonate, wherein the calcium and magnesium carbonate are produced from a Ca/Mg containing solution leached by a CO2-based hydrometallurgical process, and the system comprises the following:

• a precipitation reactor, wherein the Ca/Mg containing solution is continuously added and fully mixed with an alkaline reagent at a specific volume ratio into the precipitation reactor to form a fully reacted slurry, and the precipitation reactor further comprises a CO2 bubbling module, wherein CO2 is captured and recirculated from a calcination;
• a solid-liquid separation unit, wherein the fully reacted slurry is separated by a solid-liquid separation unit to produce calcium and magnesium carbonate products along with recycled water, wherein the recycled water is circulated back for a preparation of the Ca/Mg containing solution for a next cycle.
• a thermal decomposition unit, wherein the calcium and magnesium carbonate products are calcined by the thermal decomposition unit to produce an alkaline reagent, wherein the alkaline reagent is recycled back into the precipitation reactor.