초록

A process for the preparation of finely divided precipitated calcite in which carbon dioxide is introduced into an aqueous calcium hydroxide slurry containing anionic organopolyphosphonate polyelectrolyte with the carbonation started at a temperature above about 7°and below about 18°C.

대표청구항 ▼

A process for the preparation of finely divided precipitated calcite having an average particle size not greater than about 0.03 micron, which comprises introducing carbon dioxide into an aqueous slurry of calcium hydroxide containing anionic organopolyphosphonate polyelectrolyte present in the amou

A process for the preparation of finely divided precipitated calcite having an average particle size not greater than about 0.03 micron, which comprises introducing carbon dioxide into an aqueous slurry of calcium hydroxide containing anionic organopolyphosphonate polyelectrolyte present in the amount of from about 0.02 to 1.0 weight percent based on the calcium carbonate equivalent of said hydroxide, the concentration of said hydroxide in said slurry being greater than about 5 weight percent, starting said introduction at a temperature above about 7°C. and below about 18°C. and continuing said introduction until calcite precipitation is substantially complete.