C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
252/15
C01B 33/26 (2006.01)
Patent
CA 1101825
IMPROVEMENTS IN OR RELATING TO ZEOLITES ABSTRACT OF THE DISCLOSURE A process for preparing zeolite A from a mineral of the kandite group which process comprises milling a mineral of the kandite group which has associated therewith substantially no surface iron and not more than 0.5% by weight of interstitial iron for a time and under conditions such that said mineral of the kandite group is rendered sub- stantially free of aggregates and no further significant improvement in the brightness of said mineral of the kandite group can be obtained by milling, calcining the milled mineral of the kandite group at a temperature in the range of from 550°C to 925°C to form a calcined kandite mineral; preparing a mixture of the calcined kandite mineral and an aqueous solution of sodium hydroxide of concentration not less than about 5M, the proportions of calcined kandite mineral and sodium hydroxide being such that the molar ratio Na2O/SiO2 is in the range of from 0.5 to 1.5; heating said aqueous mixture at a temperature in the range of from 60° to 100°C for a time from 2 to 8 hours; and separating crystalline zeolite A from the aqueous mixture.
304110
English Clays Lovering Pochin & Company Limited
Sim & Mcburney
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