The thermo-dynamics of reactions between carbonatite and sodium silicate solution at ordinary temperature (25℃) were investigated. The calculated results indicate that at ordinary temperature, the reactions between dolomite, calcite, Ca2+ and Mg2+ in carbonatite and H4SiO4, H3SiO4- and H2SiO42- in sodium silicate solution to form the cementitious products of hydrated calcium silicate or hydrated magnesium silicate all possibly happen; among these reactions, the reactions to form gyrolite (2CaO·3SiO2·2.5H2O) and serpentine (3MgO·2SiO2·2H2O) are the most possible to occur. Further, the dissociation degree of dolomite and calcite and the activity of H3SiO4-, H2SiO42- and H4SiO4 ions are the key factors to inlfuence the reactions.
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