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US 2014/0004347 A1Published application
Precipitated magnesium carbonate
AssigneeOmya International AG
InventorsMichael Pohl, Christian Rainer, Markus Esser
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Abstract
The present invention relates to a process for preparing hydromagnesite in an aqueous environment. The invention further relates to such hydromagnesite having a specific platy-like morphology in combination with a specific average particle size and to their use as minerals, fillers and pigments in the paper, paint, rubber and plastics industries and to the use as flame-retardant.
Claims18
A hydromagnesite composition obtained by the process comprising the steps of:
- a) providing at least one magnesium oxide source;
- b) providing gaseous CO2 and/or carbonate-comprising anions;
- c) slaking of said magnesium oxide source of step a) to convert the magnesium oxide at least partially into magnesium hydroxide;
- d) contacting the obtained magnesium hydroxide of step c) with said gaseous CO2 and/or carbonate-comprising anions of step b) to convert the magnesium hydroxide at least partially into precipitated nesquehonite;
- and
- e) treating the obtained precipitated nesquehonite of step d) in a heat-aging step, wherein the precipitated nesquehonite obtained in step d) is ground prior to the heat-aging step of step e).
3 more elements
Dependencies are inferred from the claim text.