Process for the production of highly permeable calcined diatomites with low cristobalite content and resultant calcined diatomaceous filtration agents

  • US 5,179,062 A
  • Filed: 06/07/1991
  • Issued: 01/12/1993
  • Est. Priority Date: 06/20/1990
  • Status: Expired due to Term
First Claim
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1. A process for the production of calcined diatomaceous filtration agents having a cristobalite content lower than 1% and a 50-μ

  • m screen retention rate lower than 5% by rapid calcination of diatomites, comprising injecting the diatomite into a high-temperature gaseous stream and during its residence in the gaseous stream maintaining the diatomite between about 1250° and

    850°

    C. for a period of time between several tens of milliseconds and several seconds.

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