IN257716: A process for the preparation of ultra fine activated calcium carbonate from industrial waste of phosphoric acid plant
Abstract
The invention provides a process for the preparation of ultra fine activated Calcium Carbonate from an industrial waste of Posphoric acid plant The invention involves the treatment of crude and grey Calcium Carbonate with dil. HCL followed by neutralization with NaOH and subsequently re precipitated with Calcium Carbonate solution in the presence of chelating agent and dispersant. It provides a simple and precise method to utilise an industrial waste to synthesise a value-added material; ultra-fine glossy precipitated Calcium Carbonate having whiteness more than that of Boric acid which is usually used as a standard for comparison of reflectance.
Filing Date:
30-03-2006
Issue Date:
29-10-2013
Applicant:
CSIR - Institute of Minerals and Materials Technology (CSIR-IMMT), Bhubaneswar
Patent No:
IN257716
Application No:
0910DEL2006
Inventor(s):
Rangadhar Nayak, Surendranath Das
IPC Classification:
C01F11/18
Country:
India
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