| 摘要 |
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 Mg2SiO4(s)+4H+=2Mg2++SiO2(aq)+2H2O. At the second step, deposition is carried out at higher pH. The following reactions take place: Mg2++HCO3Çè-=MgCO3(s)+H+ and Mg2++CO3Çè2-=MgCO3(s). The presence of HCO3Çè- 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 |
