Abstract: An in situ process for making improved zeolitic fluid cracking catalysts by spray drying a mixture of (i) hydrous kaolin and/or metakaolin, and (ii) calcined aluminum source, said calcined aluminum source being derived from a pulverized, ultrafine kaolin, calcining the resulting microspheres to convert hydrous kaolin to metakaolin, and reacting microspheres composed of a mixture of metakaolin and calcined aluminum source with an alkaline sodium silicate solution. The weight percent of metakaolin in the calcined microspheres is greater than the calcined aluminum source content.

Abstract: An improved method for improving the brightness of clay of the type that is capable of being bleached by an oxidative reagent, such as Georgia gray kaolin. Such clay, in the form of a dispersed slurry, is treated with a combination of an inorganic condensed phosphate, sodium hypochlorite and ozone, preferably including separate treatment steps of magnetic purification and reductive bleaching. Suitable phosphates include sodium hexametaphosphate, sodium tripolyphosphate and tetrasodium pyrophosphate. The hypochlorite is added shortly before ozonation, and the phosphate is added before, simultaneously with, or after the hypochlorite.

Abstract: A selective flocculation process that uses a mixture of dispersants including soda ash to disperse a slimed ore pulp prior to conditioning with a fatty acid, salt and then a polymeric flocculating agent.

Abstract: Separation of impurities from kaolin clay is accomplished by conditioning a dispersed aqueous pulp of the clay with an anionic flotation collector, followed by centrifugation or the like to cause the impurities to settle from a dispersed pulp of the clay without an intermediate froth flotation step or a flotation waste froth is centrifuged or hydrocloned to recover valuable kaolin contained in the froth.

Abstract: An improved method for improving the brightness of clay of the type that is capable of being bleached by an oxidative reagent such as Georgia gray kaolin. Such clay, in the form of a dispersed slurry, is treated with a combination of sodium silicate, sodium hypochlorite and ozone, most preferably followed by magnetic purification and a reduction bleach. Sodium hypochlorite is added shortly before ozonation.

Abstract: Separation of impurities from kaolin clay is accomplished by conditioning a dispersed aqueous pulp of the clay with an anionic flotation collector, followed by centrifugation or hydrocloning to cause the impurities to settle from a dispersed pulp of the clay without an intermediate froth flotation step or a flotation waste froth is centrifuged or hydrocloned to recover valuable kaolin contained in the froth.