Processes for producing a precipitated calcium carbonate aragonìtico finely and roughly moìdo and a product of aragonita, and product of aragonita

摘要

Process for producing a precipitated calcium carbonate aragonu00ectico finely and roughly mou00ecdo and a product of aragonita, and product of aragonita ".Precipitated calcium carbonate aragonu00edtico, finely granular, is produced on a commercial scale by seeding with a precipitated calcium carbonate aragonu00edtico roughly granulated.The material of the seeding roughly granules is produced by interrupting if, after the production of 0.1 to 0.6 g / 1 / min of calcium carbonate.The supply of carbon dioxide into the lime mud alive at the beginning of the reaction, to allow subsequ00b3ente nucleation of crystals and, subsequently,Continue the supply of carbon dioxide in the rates of reaction of 0,1 g / 1 min to 0.6 g / 1 min.This material for seeding roughly granules has a surface area of Blaine can be smaller than 30.000 cm ^ 2 ^ / g, the solids are 35 to 70 percent by weight aragonita, and is added in subsequ00b3entes batching as a mud to about 1 percent by weight.Based on the total weight of the mud of the material to be sown.For the batching sown, carbonation is carried out in the rates of reaction of up to 1.8 g / 1 min on a commercial scale, resulting in the product aragonitu00edco finely granulated.This product with its end does not need to ground, is solid in which the percentage by weight of aragonita is greater than 90, has an average particle size between 0.3 to about 0.5 microns.A particle size distribution in which about 60 to 70 per cent by weight have the equivalent spherical diameter smaller than 0.5 micro.And a surface area of Blaine, who can be more than 35000 cm ^ 2 ^ / g.