A PROCESS FOR THE PREPARATION OF ULTRA FINE ACTIVATED CALCIUM CARBONATE FROM INDUSTRIAL WASTE OF PHOSPHORIC ACID PLANT

摘要

The present invention provides a process for the preparation of ultra fine activated calcium carbonate from an industrial waste of phosphoric acid plant The present 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.