Abstract: Pesticidal compositions useful in agriculture but subject to rapid degradation on exposure to sunlight are stabilized by including in the formulation an amount of a sulfonated copolymer of catechin and leucocyanidin having a molecular weight in the range of about 3000 to 6000, or of an agronomically acceptable metal or ammonium salt thereof, in an amount sufficient to provide a concentration of about 1/4 lb. to 5 lbs. per acre.

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 a small but effective amount of hydrogen peroxide to the suspension. 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: 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: 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 a small but effective amount of an organic peroxide to the suspension. 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.