Mineral compositions based on mixed solid phases of calcium carbonate and magnesium carbonate and methods for preparing such compositions

摘要

A method for preparing a mineral composition based on a mixed solid phase of calcium carbonate and magnesium carbonate, comprising at least one calcium compound selected from calcium hydroxide, calcium carbonate and mixtures thereof, magnesium oxide, water A preparation of a solid phase suspension containing magnesium oxide, at least one magnesium compound selected from at least partially hydrated dolomite and mixtures thereof, in an aqueous phase, wherein the solid phase The above preparation wherein the weight is between 5% and 15% of the total weight of the suspension; to the suspension heated to a temperature of 55 ° C. to 90 ° C. Carbonation of the solid phase in suspension by injecting a gas containing CO2 at a CO2 flow rate of 5-15 dm3 / min, wherein the pH of the suspension is 9 Involves stabilizing the electrical conductivity decreases and suspensions to full value, including the carbonation is stopped as soon as the stabilization of electrical conductivity is observed, the above method.