METHOD FOR INDUSTRIAL PRODUCTION OF PURE MgCO FROM OLIVINE-CONTAINING ROCK Russian patent published in 2011 - IPC C01F5/24 C22B3/04 B01D53/56 C01B33/187 

FIELD: chemistry.

SUBSTANCE: method for industrial production of pure MgCO₃ involves crushing olivine-containing rock and bringing the crushed rock into contact with water and CO₂. At the first step, which is carried out under pressure, a dissolution reaction takes place according to the equation Mg₂SiO_4(s)+4H⁺=2Mg²⁺+SiO_2(aq)+2H₂O. At the second step, deposition is carried out at higher pH. The following reactions take place: Mg²⁺+HCO₃ ^-=MgCO_3(s)+H⁺ and Mg²⁺+CO₃ ^2-=MgCO_3(s). The presence of HCO₃ ^- and H⁺ ions is mainly a result of reaction of CO₂ and water.

EFFECT: invention enables to produce pure magnesium carbonate from rock while binding free carbon dioxide gas.

19 cl, 4 dwg, 2 tbl, 2 ex