Method of producing an adsorbent from bloating minerals and calcium sulfate hemihydrate

Abstract From the Canadian patent

The invention relates to a method of producing an adsorbent where an expanded granular bloating mineral and calcium sulfate hemihydrate 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 proportion 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 mixing calcium sulfate hemihydrate and bloating mineral in such proportion that a weight ratio of calcium sulfate : bloating …