Abstract: A grain cleaning apparatus (10) for removing coarse and fine foreign materials from dirty grain before storage. The grain cleaning apparatus includes counter-rotating screen drums (18,20). Dirty grain is received in a frusto-conically shaped inner drum (18). Coarse foreign materials are prevented from passing through screen (100) of inner drum (18) and rather move to chute (38) where they fall to trough (40) for exiting from apparatus (10). Chute (38) is located between the output end (36) of the inner drum (18) and the output end (48) of the cylindrical outer drum (20). Grain is prevented from passing through screen (115) of outer drum (20). Fine foreign materials do pass therethrough, however, for exiting from apparatus (10). Clean grain drops from the output end (48) of outer drum (20).A motor (22) drives a secondary drive shaft (24). Shaft (24) drives first and second pulley systems (26,28) to rotate inner and outer screen drums (18,20) in opposite directions simultaneously.

Abstract: Chromium values are recovered from pulverized chromite ore by agitating and aerating an aqueous pulp of said pulverized chromite ore containing an amine collector at a pulp acidity less than 2.5; and recovering a chromite containing froth as a concentrate.

Abstract: Froth flotation of phosphate ore in the presence of residual organic polymeric flocculants is improved in recovery when a collector comprising a fatty acid derived from vegetable or mineral oils and a surface active agent is employed.

Abstract: Aromatic polycyclic, hydrocarbon compounds bearing at least one nuclear sulfonic acid or sulfonate moiety are useful as froth promoters to improve the recovery of clean coal in the froth flotation of finely-divided coal. Disulfonated diphenyl ether compounds bearing at least one nuclear alkyl group of from 10 to 22 carbon atoms are particularly efficacious.

Abstract: A reagent and a method for using the reagent for treating a solid material disposed in a liquid medium and having an oxygen-controlled surface condition. The reagent includes a liquid hydrocarbon, a reducing material and an activator material. The liquid hydrocarbon has a specific gravity different from the specific gravity of the liquid medium. The reducing material is present in an amount sufficient to establish a reducing environment around the solid material for breaking the oxygen control on the surface of the solid material. The activator material is present in an amount sufficient to establish an electrostatic charge on the solid material after the oxygen-controlled surface condition has been broken. A more specific feature of the invention is directed to the method of flotation of extremely fine bituminous coal having an oxygen-controlled surface condition. The reagent is useful in froth flotation processes and in bath flotation and separation processes.

Abstract: A sizing screen for particulate material of different sizes has a generally horizontal rotatable circular screen surface having a plurality of elongate radially projecting members, first collection means positioned adjacent the outer periphery of the surface for collecting an oversize fraction of the particulate material, second collection means positioned below the surface for collecting an undersize fraction of the material which passes through the screen. Discharge means comprising a rotatable table partitioned into different parts for carrying the oversize and undersize material is positioned below the first and second collection means. A plough or paddle preferably urges material from the table into outlets. The screen is suitable for handling sticky material such as coal fines and clay.

Abstract: A magnetic particle separating device in which magnetic particles entrained or contained in coolants, lubricants or working fluids are separated and removed by the application of magnetic fields.

Abstract: Condensation products of a fatty acid or fatty acid ester and a hydroxyalkylated polyalkylenepolyamine are useful as conditioners to improve the recovery of clean coal in a froth flotation process. The presence of these condensation products in the flotation medium is particularly effective to enhance the recovery of oxidized bituminous coal.

Abstract: The present invention discloses a novel machine that, by a dry process, will segregate granules of different specific gravities. The machine first segregates the granules as to size, regardless of their specific gravities and regardless of the multiplicity of the sizes (within limits set by the machine). In the next step the machine feeds individual granules side by side ranging progressively from fine to more coarse into a stream of air that ranges in carrying power from low to high in a sequence corresponding to the increasing sizes of the granules that fall through it. The carrying power of the air stream is regulated to convey granules having the same specific gravity to the same container, regardless of the sizes of the granules. Granules of different specific gravities will be deposited in different containers. Thus gold will be segregated from silver, and silver from copper etc. by the present invention.The invention is more fully described in the preceding specification.

Abstract: A portable batch type herb processing machine has a housing sized to fit on a counter top and is easily carried by a single person. Leafy portions of herbal material are separated from stems, seeds and twigs by introducing the herbal material into a selectively expandable stripping chamber where the leafy material is sheared from the stems, seeds and twigs. An upwardly directed air stream carries the light leafy material through a selectively expandable conduit into a collection chamber where the leaf material may be removed for further processing or use. The air stream can then be selectively increased to flush the stems, seeds and twigs through the conduit into the collection chamber for removal therefrom. The expandable stripping chamber and conduit may be selectively detached to provide access to the interior of the machine.

Abstract: Screening apparatus for fractionating material suspensions has a screen gap which is defined by a rotatable member and a stationary member. One of these members is provided with at least one projection which extends into the screen gap to inhibit clogging of the gap with coarse suspension materials. Any coarse suspension materials stuck in the screen gap can be removed from the screen gap by a wiper element extending from the rotatable member and overlapping the screen gap.

Abstract: A process for selectively removing hydrophilic constituents from flowable hydrophobic mixtures and suspensions which comprises forming a tenacious paste by mixing water with finely divided material which is insoluble or substantially insoluble in water and in the organic liquid in the hydrophobic mixture or suspension, which is inert to the organic liquid and the hydrophobic materials in the hydrophobic mixture or suspension and which is capable of selectively adsorbing said hydrophilic constituents. The paste is formed in a mixing-type liquid-liquid contactor so that a layer of the paste forms on and clings to the impellers and other internal surfaces of the contactor.

Abstract: A screening apparatus includes a conveyor (14) pivotally mounted on a wheeled chassis (2) for movement between an extended operational position and a folded transporting position. The conveyor (14) includes an endless belt (16) and a boom frame (20) supporting the belt (16). The boom frame (20) consists of a rear section (24) pivotally mounted on the chassis (2), and a forward section (26) pivotally mounted to the rear section (24). A screen device (54) is pivotally coupled to the conveyor forward section (26), and a hopper (12) is mounted at the rear of the chassis (2).To erect the apparatus, the conveyor section (26) is swung down to straighten the conveyor (14), and hydraulic rams (30) are operated to raise the conveyor (14) sufficiently to move the screen device (54) by means of a hydraulic ram (66).

Abstract: Isostearic acid, a liquid isomer of stearic acid, is used as an agent in a froth flotation process to concentrate the iron oxide in iron ores. By use of this flotation agent, the iron oxide in the ground ore is directly floated away from the remainder of the ore. The process enables a high amount of iron oxide to be concentrated from low grade ores.

Abstract: In a disk screen apparatus of the type having a series of corotating shafts, each of which has a longitudinal series of concentric screen disks which mesh with the screen disks of the adjacent shafts, the screen disks are carried by tubular modules mounted in end-to-end relation on the shafts. Each module comprises a tubular hub having a set of centrally apertured screen disks concentrically mounted in radially extending relation on the hub, which projects through the central apertures of the disks, the disks being attached to the hub in substantially accurately spaced relation to one another axially along the hub. A method is provided for making the modules, and also for making a disk screen apparatus embodying the modules.

Abstract: A pressurized screening device has two pairs of concentric cylindrical screenplates, one pair mounted coaxially above the other in a common housing. Each pair of screenplates has a separate rotary impeller mechanism, the impellers being mirror images of each other. The pair of screenplates share a common central feed chamber, common accepts chamber, and a common drive for the two rotary impellers. Each pair of screenplates is provided with a separate rejects collection chamber, one located at the base of the housing and the other located near the top of the housing. This arrangement permits both high capacity operation as well as efficient removal of heavy and light impurities from a feed stream.

Abstract: A phosphate ore fllotation process subjects a phosphate ore containing silica and silicates to froth flotation in the presence of a collector, said collector being a C.sub.36 high molecular weight dibasic acid comprising two carboxylic functional groups, recovering the phosphate concentrate from the overflow, and removing the separated silica and silicates in the underflow. The dibasic acids should be used in conjunction with fuel oil, not only to reduce the reagent consumption, but also to increase the grade and recovery of phosphate concentrate. The selectivity of some of these collectors is so great than an acceptable phosphate rock concentrate can be obtained from the phosphate ore in a single anionic circuit.

Abstract: In the beneficiation of phosphate ore by the flotation of siliceous material, the utilization of a condensate of N-aminoethylpiperazine with a fatty acid or fatty acid ester improves the separation of phosphate from silica. This improvement is especially great in the presence of a co-collector consisting of a polyethylenepolyamine condensed with a fatty acid.

Abstract: A vibratory apparatus for use in association with a vacuum casting apparatus wherein the box containing the sand and casting upon completion of the vacuum casting is moved on track means to a vibrating station where it is lifted off the track, tilted, and vibrated to discharge the sand and separate the sand from the casting.

Abstract: Low-grade, finely disseminated, ores that are not readily amenable to conventional flotation can be upgraded by a selective flocculation-magnetic separation-flotation process. Non-magnetic particles in such an ore can be selectively flocculated either by iron particles in the ore that contain residual magnetite or by the addition of a finely ground magnetic concentrate to the ore. The selectively flocculated pulp is then passed through a magnetic separator for the rejection of siliceous gangue. Depending on the grade of the magnetic concentrates, either cationic or anionic silica flotation may be applied for further upgrading.