Method of producing an adsorbent from bloating minerals and...

Details Method of producing an adsorbent from bloating minerals and... Method of producing an adsorbent from bloating minerals and...

B - Operations, Transporting

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252/18

B01J 20/12 (2006.01) A01K 1/015 (2006.01) B01J 6/00 (2006.01) B01J 20/30 (2006.01)

Patent

CA 1312063

Abstract The invention relates to a method of producing an adsorbent where an expanded granular bloating mineral and calcium sulfate hemi- hydrate are mixed to form a granulated material where the calcium sulfate hemihydrate is converted in toto into calcium sulfate dihydrate by the addition of a surplus of water, and where the free water is removed by drying. It is desirable that the pro- portion of bloating mineral be reduced, that the adsorption ef- fect be substantially retained and the hardness of the adsorbent be increased without any additives. This is accomplished by mix- ing calcium sulfate hemihydrate and bloating mineral in such proportion that a weight ratio of calcium sulfate : bloating minerals > 5 : 1 and up to 10 : 1 exists in the adsorbent, in that mixing is effected by calcium sulfate hemihydrate and the bloating mineral being poured together into a tank and mixed there together by a stirring tool to form a granulated mixture, in that the granulated mixture after the addition of the water and before drying is allowed a retention time of at least 4 minutes, and in that the dry calcium sulfate dihydrate is con- verted by calcining at 120 - 150°C in such a proportion into calcium sulfate hemihydrate that the adsorbent has a total water content of 1 % by weight to 16 % by weight. The adsorbent pro- duced in this manner comprises, on the one hand, open-pore smaller particles which consist only of calcium sulfate and, on the other hand, open-pore larger particles where a bloating min- eral core is coated with calcium sulfate.

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