Abstract: An improved method for separating minute, weakly magnetically susceptible particles from an aqueous clay-water slurry containing said particles in minor concentration with substantially non-magnetic minute mineral particles. In accordance with the improvement, the effects of subjecting said particles to separation in a magnetic field, are augmented by subjecting the slurry to a preliminary treatment which mechanically works the dispersed phase of the slurry as to effect release of the contaminant particles. Such working may, for example, be provided by subjecting the slurry, preferably at high solids content, to mechanical shear, to high velocity impact, or to kneading.

Abstract: A method of and apparatus for the flotation of mineral feedstock using the method of froth flotation. The method may be employed with flotation machines having their own air suction, or with flotation machines with subaeration. Pulps pretreated with flotation agents and having a density up to twice the normal density of ore pulps are submitted to a flotation process with a pulsed air flow by means of normal air supply periods alternating with periods wherein the quantity of air ranges from 1-90% of the normal air supply. The apparatus for carrying out said method makes use of known flotation machines with rotor-stator systems, which machines are modified to provide them with an air duct incorporating an air flow regulating member connected to an appropriate control means. With the existing methods of flotation there are obtained about 400 gr/l of solids in the pulp. With the present method with pulsing air supply there can be obtained about 800 gr/l of solids in the pulp.

Abstract: An air classifier comprising a rotatable open-ended drum disposed with its axis horizontal or substantially so, for receiving material to be classified, means for creating a stream of air through the drum, means for introducing material to be classified into the drum at or near the upstream end thereof, means in the drum for conveying materially axially of the drum during rotation thereof, the conveying means being in the form of helical vanes of mutually opposite hand arranged in an upstream part of the drum to convey "heavies" in counter-current to the stream of air through the drum and in a downstream part of the drum being arranged to convey "lights" in the direction of the air stream, the two helical vanes being separated by an annular member which projects radially inwards from the inner periphery of the drum.

Abstract: Certain ether amines and their derivatives are useful to improve the recovery of clean coal in a froth flotation process. The presence of these ether amines and derivatives in the flotation medium is particularly effective to enhance the recovery of oxidized bituminous coal.

Abstract: Electrically-conducting particles may be separated from mixtures thereof containing non-conducting particles by conveying the mixture through a magnetic field oriented angularly with respect to the part of conveyance. The magnetic field induces magnetic poles in the conducting particles, causing them to deflect from the path of movement of the mixture as they attempt to move in the angular orientation of the magnetic field. The non-conducting particles are unaffected, so that a separation may be achieved. The invention is applicable to a wide variety of materials, such as ores or tailings which contain desired electrically-conducting particles, such as, iron oxide, and unwanted gangue constituents.

Abstract: A process for efficiently recycling the water used in the various stages of a process for recovering glass from municipal trash. The invention comprises the separate treatment and recycling of the process water resulting from the first step separation of the incoming trash into a glass and inorganic constituent and an organic constituent for reuse in that step; the separate treatment and recycling of the process water emanating from the second step size classification to either the first or second steps; and, the treatment and recycling of the process water used in the froth flotation separation of the glass from the other inorganic constituents to any of the three steps in the process.

Abstract: In the beneficiation of phosphate ore by the flotation of siliceous material, a collector prepared by condensing a mixture of a fatty acid or ester, and ethanolamine and a hydroxyethylethylenediamine improves the separation of phosphate from silica.

Abstract: A process for the treatment of an aluminum-salt slag produced in the remelting of aluminum by the addition of salt to aluminum scrap wherein the aluminum salt slag is subjected to pressure and impact rolling to a thickness of about 0.2 mm to about 1 mm and the product is milled to an X.sub.80 value of about 130 to 150 microns. The milled product is classified in a plurality of stages to recover therefrom a large-particle fraction consisting at least predominantly of aluminum particles, and a fine-particle fraction. The fine-particle fraction is subjected to flotation in at least one flotation stage to which a base is added in an amount of 0.04 to 0.4 g of the base per ton of the material subjected to flotation to bring the pH to between 10 and 11, whereupon a cation active collector of the formula RO--(CH.sub.2).sub.n --NH--(CH.sub.2).sub.n --NH.sub.2 is added to recover an impurity-containing froth of low chloride level and a concentrate containing most of the chlorides of said slag.

Abstract: Crude potash salt is conditioned for separation into its components by means of an electrostatic field by grinding the salt to disintegration and contacting the ground salt with a conditioning agent, such as salicylic acid, which has been converted to the gaseous state, such that the conditioning agent draws up onto the surfaces of the salt crystals by absorption. The quantity of the conditioning agent employed is adjusted by varying the evaporation temperature and/or by varying the volume of heated air and/or inert gas, serving as a carrier material.

Abstract: A process of dressing mineral ores in order to improve the quality of the float in the flotation of certain minerals, particularly apatite ores. The process involves adding to a mineral ore pulp a gangue depressant material comprising certain guar gum ethers whereby an improved separation of calcite and other gangue minerals from the mineral values, particularly phosphate values, is obtained.

Abstract: Coal recovery processes of the agglomeration type in which solvent extraction with a fluorocarbon solvent is used to recover the agglomeration promoting additive.

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: A sieve chain having upper and lower ends is disposed in a housing and comprises a plurality of sieve sections and hinge means connecting adjacent ones of said sieve sections in series from one of said ends to the other. Each of said sieve sections has an inclination in the general direction from said upper to said lower end. A hinge connects one of said ends of said chain to said housing. An adjusting device is hingedly connected to the other end of said chain. The suspension flows over said sieve chain in the general direction from said upper to said lower end.

Abstract: A froth separation apparatus is provided having a separation container of generally rectangular form having two spaced generally parallel vertical sides, two generally parallel ends and a bottom, an influent feed delivering a suspension of solids in liquid at spaced points along the top of the separation container, a reagent inlet into the influent feed in advance of the separation container, diagonal froth retention screen means extending across the separation container from end to end and from a line intermediate the top and bottom of one side wall to a line adjacent the bottom of the other side wall, froth creating means in the separation container above said screen means, a weir discharge means on the said other side wall at the bottom thereof adjacent the screen means line for removal of froth and outlet means at the bottom of said one side for tailings discharge.

Abstract: Process using collectors for the flotation of minerals which allow the separation or enrichment of certain minerals, even at pH values around 7. These collectors are organic sulphides of the type R--S--R', in which the two groups R and R' are different and at least one of them preferably carries a substituent including oxygen or sulphur. The collectors are desirably used in a proportion of 10-100 ppm in relation to the weight of the mineral subject to flotation.

Abstract: PCT No. PCT/DE78/00010 Sec. 371 Date Apr. 4, 1979 Sec. 102(e) Date Mar. 19, 1979 PCT Filed July 7, 1978 PCT Pub. No. WO79/00085 PCT Pub. Date Feb. 22, 1979A magnetic separator having intersecting conveyor belts, in which the lower belt is used to transport the material to be separated, while the upper belt discharges the separated material, and in which a frame having a closed permanent-magnet system is arranged on each side of the discharge belt, each frame consisting of four directionally magnetized block magnets connected together in pairs by means of soft-iron parts, and of soft-iron intermediate parts connected together by soft-iron pole-pieces forming a working air-gap.

Abstract: A magnetic separator, in particular a drum separator, includes a magnetic system having a plurality of magnets. Each of the magnets produces an open field directed toward a separation zone which, in a drum separator, extends axially of the drum outside of the surface of the drum. The magnets may include conductive coils, preferably superconducting coils, which are traversed in the same direction by current and which include an iron-free core. The average center-to-center spacing of the coils is a maximum of 25 times the spacing between the coils and the separating zone and is preferably in the range of 15:1 to 10:1. The coils are elliptical and have major and minor axes which decrease from the outermost coil winding to the innermost coil winding, with the distances between the windings being greater along the major axes than along the minor axes.This is a continuation of application Ser. No. 843,737, filed Oct. 19, 1977, now abandoned.

Abstract: A two-mass heavy duty vibratory machine has a frame in the form of a box-like cage in which a working member, such as a screen, is received. In one embodiment of the disclosure, the frame is resiliently mounted on a stationary support surface and the working member is resiliently suspended from the frame. In another embodiment of the disclosure, the working member is resiliently mounted on the stationary support surface and the frame is suspended from the working member. In both embodiments, an exciter is mounted on the frame at a location outside the frame and spaced from the working member.

Abstract: A process for the upgrading of aluminum mineral bearing raw materials by using at least three beneficiation treatment stages consisting of dispersion of a pulp of the material in specific pH ranges, screening in specific mesh sizes, and using at least one stage of high intensity magnetic separation.

Abstract: Use of 4,4-dimethyl-1-pentanol as a froth flotation agent for coal recovery processes.