Abstract: An inlet line deflector and equalizer means for a cyclone for washing crushed and sized coal with water wherein low density (1.6 or less) washed coal particles escape through the outlet pipe above the bottom collector through the box of the cyclone while higher density (1.7 or higher) siliceous impurities drain out of the cyclone bottom. The higher density impure fractions may be recycled in another cyclone to further fractionate into purified coal and refuse. Pure coal particles flow out through the outlet pipe above the box and impure particles containing shale, rock, clay, etc. drain at the bottom. Laminar flow is uniquely created by (1) providing high solids of about 18% to 50%, (2) at high velocity of about 18 to 28 feet per second within the cyclone and (3) by placement of an inlet line deflector in a predetermined critical dimension in the intake pipe.

Abstract: A method for magnetically beneficiating an ore by removing therefrom undesired metallic minerals of inherently low magnetic attractability. An aqueous dispersed slurry of the ore is formed, and the slurry is mixed with a system of transiently suspended ferrimagnetic particles of predominantly colloidal size. The particles are further characterized by an isoelectric point in relation to the mineral sought to be removed, such that the particles spontaneously co-flocculate with the mineral to seed same. The resultant seeded slurry is passed through a porous ferromagnetic matrix in the presence of a magnetic field, which separates the seeded mineral at the matrix, with the purified ore emerging from the matrix being recovered as product. This beneficiated product, i.e. now relatively free of the undesired species, can then (as appropriate) be further processed.

Abstract: The present invention relates to the purification of glass, obtained by froth flotation from shredded municipal trash; more particularly, the present invention relates to a process for removing aluminum oxide, especially corundum, and silicon carbide particles or stones, of a size greater than 60 mesh, as impurities from the glass. The process comprises subjecting the froth-floated glass to magnetic separation, especially high intensity magnetic separation, such as that produced by employing a high intensity induced roll magnetic separator. Since such impurities function unexpectedly as magnetics in relation to glass, the refractory impurities are removed from the glass during such magnetic separation. The resulting purified glass can then be employed as glass cullet for production of finished glass articles.

Abstract: A crushed raw coal washing plant using a plurality of deflector-fitted centrifugal cyclones to produce a washed and dried mixture of clean coarse and fine coal, and fine coal alone, with means to remove refuse and means to recycle clean fine coal slurry by-product into the raw crushed coal inlet. Each centrifugal cyclone of said system is fitted with an inlet line deflector and equalizer means to create laminar flow and gravity separation whereby low density (1.6 or less) washed coal escapes through a first outlet at the top and refuse drains out of a second outlet at the bottom of said cyclone.

Abstract: A method for processing a slurry of coal particles in water by dividing the slurry into a coarse fraction including at least substantially the coarser coal particles and a fine fraction including at least substantially the finer coal particles, reducing the water content of the coarse fraction, and separately stabilizing the fine fraction by addition of coal particles alone or coal particles suspended in water or oil, or by reduction of the water content of the fine fraction.

Abstract: A method of recovering copper from ores containing copper as atacamite/paratacamite by froth flotation is described which comprises utilizing as a promoter collector compounds having the formulaRC(OH).dbd.N--O.sup..crclbar. H.sub.2 N.sup..sym. R.sup.1 R.sup.2whereinR is an aliphatic group containing from about five to ten carbon atoms or an aromatic group containing from six to about ten carbon atoms, andR.sup.1 and R.sup.2 are each independently alkyl groups containing from one to five carbon atoms.The method of the invention is useful in treating copper ores containing very small percentages by weight of copper.

Abstract: Zinc sulfide is concentrated by a froth flotation process using a substituted benzotrifluoride compound as depressant for calcium fluoride. The benzotrifluoride compounds are substituted by hydrophilic groups such as hydroxy, carboxylic acid and amino.

Abstract: A reagent schedule useful for the froth flotation of undeslimed cassiterite ore pulps comprises a metal salt/silicate hydrosol dispersant/depressant and a N-alkyl sulfosuccinamate collector, the sulfosuccinamate preferably being emulsified with a heavy neutral petroleum hydrocarbon oil such as mineral oil. In flotation of cassiterite from an undeslimed ore pulp, the collector is used along with a metal salt/silicate hydrosol dispersant/depressant at a pH in the range of about 4 to 7.

Abstract: A flotation process for concentrating tungsten or tin ores is achieved by grinding the ores with a grinding medium other than steel, first conditioning a deslimed sulfide free pulp with an acid, further treating the pulp with an emulsified collector and recovering the tungsten or tin in the float. The flotation concentrate can be further enriched by leaching with an inorganic acid.

Abstract: Particulate glass values contained in the final inorganic fraction from comminuted municipal wastes and having the particle size below 10 mesh, preferably between about 325 to about 20 mesh, are recovered by froth flotation by activating the glass surface with a bi or trivalent metal ion and using as the beneficiation reagent a water compatible sulfonated hydrocarbon.

Abstract: Sifting equipment for fine-grained bulk material, particularly flour, provided with a transit chamber inserted in the transmission line of the bulk material and containing a sieve, exposed to the action of a blower, is improved by having the transit chamber (9) mounted vertically as regards its lengthwise axis.

Abstract: Magnetic separating apparatus is disclosed which includes means for establishing a magnetic field in a predetermined zone, a separating chamber having an inlet and an outlet for fluid, fluid-permeable and magnetizable material disposed within the separating chamber, ferromagnetic shielding means for magnetically screening a zone remote from the predetermined zone; and means for moving the separating chamber between the predetermined zone and the remote zone. When within one of the remote zones, a separating chamber is screened from the magnetic field applied by the magnet within the predetermined zone, and thus the packing material within the separating chamber may be particularly efficiently regenerated within this zone. This regeneration may e.g. be carried out by passing clean water through the packing material, optionally after having demagnetized the packing material, in order to flush out magnetizable particles from collecting sites within the packing material.

Abstract: Apparatus for utilizing the flotation separation process employs first and second chambers, the first chamber being positioned above the second chamber so that the tailings from the first chamber may be gravity fed into the second chamber. Both chambers include a plurality of spaced, air bubble infusers, each of which are fed by air and water pipes extending across the corresponding chamber. A plug and throat arrangement in a bulkhead between the first and second chambers allows control over the flow of tailings from the first chamber into the second chamber. Each infuser is designed so as to provide an even spread of the air bubbles emitted therefrom.

Abstract: A collector composition for use in concentrating metallic mineral ores by froth flotation which comprises a mixture of a mercaptan and an emulsifying or wetting agent adapted to improve the dispersion of the mercaptan into the pulp, and a froth flotation method for concentrating metallic mineral ores wherein the above collector composition is employed as the collector, are disclosed herein.

Abstract: Beneficiation of coals, metallic, and non-metallic ores by froth flotation process using polyhydroxy alkyl xanthate depressants for pyrite in coals, or in metallic and non-metallic ores to obtain pyrite sulfur free coal, as well as pyrite free metallic or non-metallic minerals by depressing pyrite and marcasite as the waste material of coal or ore, comprises; adding to a water suspension of finely divided coal or ore of a polyhydroxy alkyl xanthate to depress pyrite and certain organic sulfur compounds in the presence of an adequate collector for recovering pyrite sulfur free coal, or pyrite and marcasite free mineral concentrates.

Abstract: A method and apparatus for the wet gravity concentration of particulate ores in which a cascaded series of concentrators may be arranged in a matrix array from a basic triangular unit comprising a first concentrator for dividing a pulp stream into two sub-streams of differing concentration and a pair of subsidiary concentrators for respectively dividing the sub-streams, the subsidiary concentrator dividing the richer sub-stream being arranged to remove at least part of its enriched stratum without intruding substantially into its feed grade stratum while the subsidiary concentrator dividing the poorer sub-stream is arranged to remove at least part of its depleted stratum without intruding substantially into its feed grade stratum. The method and apparatus are described with reference to both tray and cone concentrators.

Abstract: Lanolin is employed as a modifier for froth flotation utilizing conventional collectors such as fatty acids, kerosene, and the like. Lanolin added to the system acts as a depressant which assists in the selectivity of the process for the desired mineral or inhibits the flotation of gangue materials. Scheelite ore flotation is substantially improved using lanolin in addition to a conventional collector such as tall oil.

Abstract: A rotary magnetic separator is disclosed which includes a ferromagnetic rotor provided with a plurality of arcuate separating chambers supported at its periphery. Each separating chamber comprises an inlet for feed suspension in its bottom coupled to a pump by way of a flexible pipe, and an outlet for feed suspension in its top, there being a fluid permeable and magnetizable packing material between the inlet and outlet. Two electromagnet poles are magnetically coupled to the rotor which serves as a further pole. The rotor can be turned by a motor so as to move certain separating chambers into the vicinity of the electromagnet poles. Feed suspension can then be supplied to these separating chambers and magnetizable particles from the feed suspension may become entrained in the packing material. Subsequently the rotor can be turned back to its original position and these separating chambers can be flushed out with clean water.

Abstract: A separating chamber for a magnetic separator is disclosed, which includes a rigid canister having an inlet and an outlet for fluid, and a packing of magnetizable material disposed within the canister so that, in use, fluid supplied to the inlet passes through the magnetizable material towards the outlet. Plates are spaced apart within the packing material and disposed substantially along the general direction of flow of the fluid through the packing material, whereby the plates act to limit permanent deformation of the packing material by magnetic forces acting on said material upon the chamber being moved axially into and out of a zone in which a magnetic field is established.

Abstract: Particulate mixtures of non-magnetic or paramagnetic materials are separated by selectively coating the surfaces of a component or components of the mixture with a magnetic fluid. Thereafter, the particulate mixture is subjected to a magnetic separation yielding a magnetic fluid-coated fraction and a non-magnetic fraction. The process is especially useful in mineral beneficiation wherein a mineral concentrate is recovered from its ore.