Process for the production of highly permeable calcined diatomites with low cristobalite content and resultant calcined diatomaceous filtration agents
OwnerPascal Dufourinventor
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Abstract
A process for the production of calcined diatomaceous filtration agents having a cristobalite content lower than 1% and a 50-.mu.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.degree. and 850.degree. C. for a period of time between several tens of milliseconds and several seconds, and calcined diatomaceous filtration agents having a permeability between 0.06 and 0.4 darcy and a cristobalite content lower than 1%.
Claims10
A process for the production of calcined diatomaceous filtration agents having a cristobalite content lower than 1% and a 50-.mu.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.degree. and 850.degree. C. for a period of time between several tens of milliseconds and several seconds.
A calcined diatomaceous filtration agent having a permeability between 0.06 and 0.4 darcy and a cristobalite content lower than 1%.
Dependencies are inferred from the claim text.