Patent ID: 9061920
Filing Date: 2015-06-23
Classification: C01F,C01P,C09C,C09K,D21H,Y10T

Abstract:
1. A hydromagnesite suspension obtained by the process comprising the steps of: a) providing at least one magnesium oxide source, wherein the magnesium oxide source is a calcined, calcium magnesium carbonate; b) providing gaseous CO c) slaking the magnesium oxide source of step a) in an aqueous environment to obtain a slaked product comprising magnesium hydroxide, calcium hydroxide and magnesium oxide; d) contacting the slaked product with the gaseous CO e) treating the product comprising precipitated nesquehonite and precipitated calcium carbonate to heat-ageing to form a suspension comprising an admixture of hydromagnesite and precipitated calcium carbonate, wherein the suspension so obtained has (i) 30 to 60 wt. % of hydromagnesite based on the total weight of the solid contents of the suspension, (ii) 40 to 70 wt. % of precipitated calcium carbonate based on the total weight of the solids content of the suspension, (iii) hydromagnesite and precipitated calcium carbonate particles having an average particle size d