Abstract: A no-discharge concrete reclamation system that eliminates all waste products and associated pollution. In addition to separating and washing sand and aggregate as provided in conventional systems, the invention provides for holding the water-cement slurry in suspension while continuously circulating same with a transfer pump to a point near the batching plant. On demand, slurry for batching from the circulating stream is provided to the mixers. Preferably, clarified wash water is held separately and used to provide mixer wash water, and/or make-up water for the slurry.

Abstract: Articles having a first specific gravity may be separated from articles having a second specific gravity by placing said articles in an environment having a specific gravity between the specific gravities of the articles to be separated and thereafter subjecting the articles to pressure waves preferably of an ultrasonic frequency and having an intensity sufficient to initiate movement of said articles in the environment. The articles with the high specific gravity migrate downwardly while the lower specific gravity articles migrate upwardly to the surface where they may be removed.

Abstract: A method for removing bitumen from mineral particles recovered from bituminous froth recovered as a product of aqueous extraction of tar sands which method comprises scrubbing the minerals with a liquid hydrocarbon solvent containing at least 10 weight percent aromatics and thereafter separating the minerals from the solvent and subsequently drying the minerals.

Abstract: A process for the separation of scheelite from calcite present in an ore or a concentrate formed from an ore, which process includes the steps of decomposing any flotation agent residues contained in the concentrate, and treating the ore or concentrate to condition the particle surfaces with a mono-substituted butane diamine of the formula H.sub.2 N.C.sub.4 H.sub.8.N(H)R, wherein R is a long-chain saturated or partially-unsaturated aliphatic hydrocarbon radical having at least 14 carbon atoms. The treated ore or concentrate is subjected to flotation in an aqueous system, and the scheelite is recovered in the flotation froth.

Abstract: A method for brightening a kaolin clay wherein an aqueous dispersion is initially formed of said clay, which dispersion is blunged and conditioned and the resultant slurry thereupon subjected to a froth flotation treatment to remove titaniferous impurities. The purified product from the froth flotation treatment is thereupon subjected to magnetic separation by passing such product through a slurry-pervious ferromagnetic matrix positioned in a high intensity magnetic field, which results in substantial, additional brightening of the clay.

Abstract: An automatic developability control system is provided in the developer assembly of an electrostatic reproduction apparatus to sample toner particle developability. Upon an indication that replenishment of toner powder is necessitated, the control system is operative to activate a toner powder dispensing apparatus. The developer mixture may be comprised of magnetic toner particles or magnetic carrier particles to which toner powder is adhered. To prevent debris material such as paper scraps, fibers, dust, bits of rubber, etc. from plugging or jamming the toner powder sensing device of the control system, provision is made for separating the developer mixture from debris material prior to the introduction of developer mixture into the control system.

Abstract: Device for the powder reclamation, specifically in electrostatic powder coating systems comprising a dust filter with a partition installed in an enclosure in a fashion such that a suction chamber for the air-powder mixture, which can be connected with the exhaust of the system, is created with a channel which passes the filter and has a constricted cross section while emptying into a funnel-shaped bottom part of the enclosure which may be detachable and can be sealed on the underside via a flange, above which channel there are arranged filter medium layers with upward extending passage openings which connect to an exhaust chamber with an air suction pump, in which chamber a compressed-air nozzle assembly is provided which can be moved across the filter medium layers for their blowout and cleaning.