• US 3,572,500 A
  • Filed: 06/18/1968
  • Issued: 03/30/1971
  • Est. Priority Date: 06/18/1968
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of beneficiating raw diatomaceous earth containing appreciable quantities of clay which comprises:

  • a. wet attritioning the raw diatomaceous earth to reduce the diatomite particle size to from about 5 to about 44 microns;

    b. hydraulically centrifugally classifying the product of step (a) to a +325 mesh fraction and a -325 mesh fraction and discarding the +325 mesh fraction;

    c. mixing the -325 mesh fraction with a clay dispersant to disperse clay particles; and

    d. centrifugally classifying the mixture obtained in step (c) into a +2 and a -2 micron fraction and recovering the +2 micron fraction characterized by a high diatomite content.

View all claims

    Thank you for your feedback