Process for obtaining precipitated calcium carbonate

Process for obtaining precipitated calcium carbonate

  • CN 105,473,505 A
  • Filed: 08/08/2014
  • Published: 04/06/2016
  • Est. Priority Date: 08/20/2013
  • Status: Active Application
First Claim
Patent Images

1. , for the preparation of a method for PCC product, comprise the following steps:

  • A () is by with every mole of Ca (OH) 2count 0.005 mole to 0.030 mole in Sr (OH) 2ca (OH) is made under the existence of the Sr of form 2suspensoid carbonating prepares the aqueous suspension of precipitated chalk crystal seed, B () makes the described precipitated chalk crystal seed of preparation in step (a) dewater and disperse to obtain d 50be less than or equal to 0.1 μ

    m to 0.3 μ

    m and BET specific surface area is 10m 2/ g to 30m 2the aqueous suspension of the precipitated chalk crystal seed of/g, and C () by making Ca (OH) under the existence by the middle described precipitated chalk crystal seed obtained of the step (b) of dry weight basis 0.5% to 5% 2slurry carbonating forms the aqueous suspension of PCC product, The d of wherein said precipitated chalk crystal seed 50be less than the d of described PCC product 50and the aragonite polymorph content of described precipitated chalk crystal seed is more than or equal to the aragonite polymorph content of the described PCC product obtained in step (c), the feature of described method is that the described dehydration of step (b) is undertaken by using tube press.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×