Abstract: The settling of finely-divided solids that are in suspension in an aqueous medium due to the presence of a colloidal argillaceous mineral is enhanced by adding to the suspension a small but effective amount of at least one chelating agent. Effective chelating agents include malic acid, tartaric acid, nitrilotriacetic acid, and N,N,N.sup.1,N.sup.1 -ethylenediaminetetraacetic acid. This invention is especially useful for treating aqueous suspensions of ultrafine clay and other materials resulting from the hydraulic concentration of an ore material, such as phosphate slimes.

Abstract: A modified clay paper coating composition comprising a montmorillonite clay having at least partially hydrolyzed aluminum chloride bonded thereto is made by treating montmorillonite clay with a non-aqueous solution of anhydrous aluminum chloride following by hydrolyzing with hot water. A paper substrate coated with this composition exhibits improved image light fastness when employed in a pressure-sensitive duplication system.

Abstract: Novel 6-amino-9-(substituted benzyl)purines are prepared by allowing an appropriate substituted benzyl halide, e.g., a substituted benzyl chloride, to react with adenine under the appropriate conditions. Oxidation of the resulting purine derivatives yields the corresponding N.sup.1 -oxides. These compounds, i.e., both the purine derivatives and the N.sup.1 -oxides thereof, have anti-coccidial activity and are useful for controlling cecal and/or intestinal coccidiosis when administered in minor quantities to animals, in particular to poultry, usually in admixture with animal sustenance.

Abstract: A sand core and mold composition for use in casting metals comprising foundry sand, clay, water and from about 0.0025% to about 1% by weight of a water-soluble graft copolymer of acrylic acid and a minor amount of a water-soluble polyhydroxy polymeric compound, including water-soluble salts thereof.