Abstract: An iron ore is finely ground and slurried prior to being subjected to treatment with a selective flocculant for iron values. Subsequent to treatment, the iron values are allowed to settle into the underflow concentrate and be recovered. The selective flocculant employed is a hydroxymethylated polyacrylamide having a high molecular weight and a degree of hydroxymethylation in excess of about 50%.

Abstract: Selective flocculation of iron ores is accomplished through the employment of partially carboxylated polyacrylamides as the selective flocculant. The partially carboxylated polyacrylamides employed in the selective flocculation contain from about 20-65% carboxyl groups and are of a molecular weight in excess of one million. The selective flocculation process performs a separation of iron ores predominantly containing semitaconite, oxidized taconite and hematitic-goethitic jaspers from their associated siliceous gangue.

Abstract: An applicator for pulverizable substances. The applicator comprises, in co-operation, a resilient container for the pulverizable substance, a permeable membrane through which said substance passes and means for maintaining and releasing said substance.

Abstract: Reaction of a beta-aminopropionamide with an acrylic acid or its derivative provides an N-substituted acrylamide monomer having cationic substituents attached thereto. The instant reaction occurs under mild processing conditions at a temperature between about 160.degree. C. and 230.degree. C.

Abstract: Cellulosic paper sheets interleaved with sheets of a thermoplastic material having a glass transition point below about 100.degree. C. and a melting point of about 125.degree. C. or more provide a cushion for use in laminating operations. The thermoplastic sheets employed in the cushion have an individual thickness ranging from about 2 to 20 mils and a combined thickness of at least 5 mils. Such a cushion provides a long-term, reuseable cushion for laminating operations.

Abstract: Preparation of crystalline water-insoluble ammonium polyphosphate through processing a melt of urea and phosphoric acid or alternatively processing solid urea phosphate. Contact between the exiting product and recycled gaseous by-products ensures proper pH.

Abstract: Phosphate slimes are effectively settled by the sequential addition of effective amounts of a low molecular weight acrylamide: acrylic acid copolymer of high anionicity and a high molecular weight acrylamide: acrylic acid copolymer of low anionicity.

Abstract: Poly(beta-alanine) acts as an effective flocculant in water treatment, especially those waters containing colloidal suspensions. In solution, these polymers exhibit a degree of metastability of significance in the flocculation of effluent substrates.

Abstract: Reduced coagulum is obtained when water-soluble monomers are polymerized in the dispersed phase of a water-in-oil emulsion and added salt is present in the aqueous monomer phase.

Abstract: Improved beneficiation of non-sulfide iron free ores by froth flotation results when the collector employed is a mixture of a naturally derived fatty acid and a partial ester of a polycarboxylic acid having at least one free carboxylic acid group.

Abstract: Mineral and coal concentrates are effectively dewatered by a process wherein there is employed a dewatering aid comprising of an N-substituted sulfosuccinamate. The process provides for mixing the dewatering aid to an aqueous slurry of the concentrate and thereafter subjecting the treated slurry to filtration.

Abstract: Water-soluble cross-linked polysulfonium derivatives of poly(thiodiethanol) ethers are provided by reacting the ethers with difunctional sulfide-reactive alkylating agents.

Abstract: A cationic copolymer is prepared by first dissolving the total quantity of a suitable nonionic monomer in water. To this solution there is added up to about 95 mole percent of the total quantity of a suitable cationic monomer of greater reactivity than the nonionic monomer. The solution is then emulsified in a sufficient quantity of a hydrocarbon oil so as to provide a water-in-oil emulsion, with the water phase dispersed. Polymerization is then initiated with incremental additions of the withheld cationic monomer continuing throughout the copolymerization reaction. The resulting cationic copolymer exhibits a uniform distribution of cationic moieties along the polymer chain length which, in turn, has been shown to be a surprisingly more effective cationic copolymer when employed as a dewatering aid.

Abstract: Water-soluble cross-linked cationic polysulfonium derivatives of poly(thiodiethanol)ethers are useful flocculants for suspended solids in aqueous medium.

Abstract: Treatment of a slurry of a mineral concentrate with a flocculant followed by a combination of an anionic surfactant and a water-insoluble organic liquid provides reduced moisture content upon dewatering the thus-treated slurry.