Abstract: Beneficiation of metallic oxide ores by froth flotation process using polyhydroxy fatty acids collector-frothers in the presence of silica, silicates, and the like gangue minerals to obtain pure concentrates of desired metal values; comprises, adding to a water suspension of finely divided ore material of polyhydroxy fatty acids to collect the metal value, leaving unaffected gangue minerals.

Abstract: Spray drying coffee extract by uniformly fluctuating the extract and concomitant inert gas flow through the drying tower spray nozzle produces a unique agglemorate-type product. A two-fluid ventur-type flowrator is employed to assist regulation of extract flow rate cycles between set maximum and minimum values. Smaller, quickly drying droplets, atomized at high flow rates of extract are caused to impact with the larger, slower drying drop (minimum extract flow rate) by the reported expansion and collapse of the spray pattern and the augmentation of turbulence by the cyclic inert gas flow rate.

Abstract: An air separating system, including: at least three impurity adsorbers connected with each other by a number of on-off and follower valves and located in air supply conduits leading from an air cooling tower for water-cooling the feed air to reversing heat exchangers of the system; an expansion turbine for producing chill necessary for the system; turbine output gas conduits for feeding part of output gas of the expansion turbine to one of the impurity adsorbers through the heat exchangers; regenerating gas conduits for feeding to another adsorber the outflow of the turbine output gas from the first adsorber after heating; and a cooling water circuit for circulating cooling water between a water cooling tower for cooling the cooling water against waste nitrogen gas to be discharged from the system through the heat exchangers and the air cooling tower; the feed air from the air cooling tower being supplied to the heat exchangers in operation through at least one of the impurity adsorbers, while discharging par

Abstract: A scheelite concentrate is recovered from a scheelite ore containing silicate minerals and other calcareous minerals by froth flotation which process comprises grinding the ore sufficiently fine to liberate the scheelite grains, pulping the gound ore with water to form a slurry containing between about 20% and about 40% solids by weight, sequentially conditioning the slurry with at least one alkali metal carbonate in small but effective amounts to provide an alkaline pH adjustment and a source of carbonate ions, with small but effective amount of alkali metal silicates to depress siliceous and calcareous gangue minerals other than scheelite and with a fatty acid collector in small but effective amounts to coat the scheelite grains, the conditioning with the fatty acid collector being conducted with sufficient agitation to disintegrate floccules of scheelite, silicate mineral and other calcareous mineral grains and to preferentially reflocculate the scheelite grains for a period of time sufficient to produce u

Abstract: A reverse flotation process for removing alkaline earth metal carbonate impurities particularly dolomite and calcite as the cell overflow from a flotation feed reagentized with water, a carbonate collector, a phosphate depressant and a pH regulator to about 20-30% solids and a pH of about 5.5-6.0. The phosphate concentrate is collected as the cell underflow.The carbonate collectors comprise stable salts of sulfonated linear fatty acids having a straight carbon chain of about eight to twenty-two carbon atoms and a direct sulfur to carbon bond. The sodium salt of sulfonated oleic acid is the preferred carbonate collector. Phosphate depressants include sodium tripolyphosphate.The flotation feed particle size is preferably such that 90% by weight of the particles pass through a 42 Mesh (Tyler) screen. The effectiveness of the separation improves as the particle size of the flotation feed is decreased.

Abstract: A method and a system for disposing of the pyrolysis gas generated in a pyrolyzing system to refine the same are presented in which an absorbing agent for eliminating harmful gas is introduced into a thermal reactor in such an amount that a large percent of such agent is unreacted but it is efficiently recovered together with char from the pyrolysis gas and also these recovered materials are utilized to remove oil and tar from water used in cleaning the pyrolysis gas, the recovered solid particles of the char and unreacted absorbing agent and the oil and tar separated from the cleaning water being recirculated in the pyrolyzing system.

Abstract: In a preferred form a restaurant meat broiling range hood is integrated with a fiber bed-type mist eliminating apparatus. Assistance is provided in the preferred form by a pump to draw the gas stream through this apparatus. Electrical and plumbing control systems are shown provided as substantially pre-assembled units for ease of field installation. A unique cleaning system is provided, which is simple to conduct.

Abstract: Low molecular weight compolymers and terpolymers of the general structure: ##STR1## wherein R.sub.1 is hydrogen or a methyl radical, R.sub.2 is hydrogen or COOM and M is a hydrogen, alkali metal cation or ammonium ion, exhibit excellent depressive action in the flotation of non-sulfide mineral ores thereby resulting in improved selectivity and recovery. The low molecular weight copolymers and terpolymers, perform depressing action without resulting in any associated flocculation in the flotation system. These copolymers and terpolymers can be combined with other known depressing agents in nonsulfide ore flotation processes such as starch, dextrin, water soluble gum and the like, to obtain equivalent or improved selectivity and recovery than would be obtained using these depressants alone.

Abstract: A method and apparatus of preventing generation of smoke from a coke oven including a plurality of juxtaposed and alternately disposed combustion chambers and carbonization chambers so that the carbonization chambers are heated by heat generated in adjacent combustion chambers and exhaust gas is exhausted from the combustion chambers through a common smoke duct and a chimney, the exhaust gas is passed through a common exhaust gas duct including a dust collector for a predetermined interval after loading raw material coal into the carbonization chambers. At the end of this interval, the exhaust gas is again passed through the common smoke duct.

Abstract: A portable, dry-placer mining apparatus is provided with a vacuum chamber which defines a contained region of lower-than-atmospheric pressure which establishes the mode or means for drawing material into the chamber. The material is then ejected therefrom at a rate determined by the differential pressures established internal and external to the vacuum chamber. To prevent material impaction from interferring with the vacuum controlled output flow of material, any tendency of the material toward impaction is disrupted by an air stream flowing therethrough in response to the lowered pressure within the vacuum chamber. The material is output to a vacuum controlled separator device which is vibrated to separate denser from less-dense materials. A vacuum responsive frequency control is incorporated in the vacuum responsive vibratory drive of the separator device. The entire device is easily manually transportable and may be fitted to a conventional backpack frame.

Abstract: An arrangement for feeding glowing coke has a cooling shaft into which coke and cooling gas are received, a coke transporting container arranged on the shaft and having a closable bottom opening, and a closing device arranged in the cooling shaft below the coke transporting container and including a housing sealed from atmosphere, and a closing plate which is raisable and lowerable and also displaceable in substantially horizontal direction in the housing.

Abstract: A process for the froth flotation of calcium phosphate-containing minerals is provided which comprises carrying out the flotation in the presence of an amphoteric flotation agent having the general formula: ##STR1## wherein: R is a hydrocarbon group having from about seven to about twenty-four carbon atoms;A is an oxyalkylene group having from two to about four carbon atoms;R.sub.1 is selected from the group consisting of hydrogen and hydrocarbon groups having from one to about four carbon atoms;Y.sup.- is selected from the group consisting of COO.sup.- and SO.sub.3.sup.- ;n is a number from 0 to 1;p is a number from 0 to 5;q is a number from 1 to 2;and salts thereof.

Abstract: An improved spray dryer is disclosed for drying heat sensitive food products under sanitary conditions with a maximum product recovery for a minimal dryer size. The dryer has an air flow system for moving air through a drying chamber at generally atmospheric pressure with a controlled laminar air flow. The product being dried is sprayed into the drying chamber by an air distributor plate with a relatively rapid air flow through and immediately surrounding the product spray and with a surrounding air flow of lower velocity. The dried droplets or powder are removed by a powder collector including a drag system.

Abstract: The instant invention is directed to a method of inhibiting and dispersing deposit formation on metal surfaces of an evaporator used for the processing of black liquor which comprises the step of treating black liquor, at any point prior to completion of said processing, with a deposit inhibiting concentration of low molecular weight cationic polymer selected from the group consisting of poly(diallyldimethylammonium chloride), polymethacrylamidopropyltrimethylammonium chloride, poly-2-methacryloxyethyltrimethylammonium methosulfate, and poly-2-methacryloxyethyltrimethylammonium chloride.

Abstract: A fumes control system duct-and-car arrangement for a duct including a wall portion closed by a flexible web, and a support structure in the duct under the web to prevent collapse of the web into the duct under evacuation includes a car disposed for movement along the duct to raise the web and couple the interior of the car to the interior of the duct. The car is provided with a door which can be opened to gain access to the interior of the car. The support structure for the web provides an access way so that maintenance and inspection personnel can move from the interior of the car into the interior of the duct. Various types of apparatus for moving the car along the duct include a motor mounted on the car and a wheel supporting the car from the duct and driven by the motor. Another motive mechanism provides a motor mounted beyond one of the limits of travel of the car along the duct, and a flexible cable, chain or the like, pulled by actuation of the motor to move the car along the duct.

Abstract: A vapor fraction containing hydrogen and at least one hydrocarbon selected from the group consisting of C.sub.1 to C.sub.4 hydrocarbons is separated from a hydrogen-rich refinery off-gas feed to give a liquid product fraction. The refinery off-gas is fed to and compressed in a compressor/expander having compressor means and expander means mounted and driven on a common shaft, and then cooled and partially condensed to form a two-phase fluid in a heat exchanger followed by separation of the vapor and liquid product phases of the fluid in a separator or a separator/fractionation column stabilizer unit. The separated vapor phase is transmitted to the compressor/expander unit wherein the vapor is depressurized and partially condensed, thereby driving the compressor.

Abstract: A desalinization process is disclosed employing freezing and pressure steps. In the process, salt water is frozen to provide - liquid free ice. The ice is then crushed and subjected to a compression force and external heat for a period sufficient to liquify at least 30 percent of the crushed ice. The remaining ice is recovered and melted to yeild purifed water.

Abstract: A process for the separation of one or more kinds of solute in a cryohydrate characterized in that a cryohydrate obtained by freezing a solution together with a high tensile member is passed through pressure-application zones whose inner sectional area is reduced toward the direction in which the high tensile member is pulled to thereby separate fractions having high solute contents from fractions having low solute contents, and apparatus therefor.

Abstract: In the obtaining of oxygen from air by low-temperature rectification in a double rectification column by compressing the air to be fractionated into higher and lower pressure partial streams; cooling said partial streams in indirect heat exchange with a nitrogen-enriched gaseous stream from the rectification column; and introducing the partial stream of the air to be fractionated which has been compressed to the higher pressure into the lower part of the high pressure column,the improvement of passing at least a part of the partial stream of the air to be fractionated which has been compressed to the lower pressure to a supplemental fractionating column operating at between the pressure ambient in the high-pressure column and the pressure ambient in the low-pressure column, withdrawing from said supplemental column a nitrogen-enriched liquid, passing the latter as reflux to the low-pressure column, engine expanding the remaining portion of the partial stream compressed to the lower pressure and/or a gaseous s

Abstract: A method of operating a conveying and storage system associated with a coal pre-heating installation, supplying pre-heated coal to a coking oven battery, the system including a series of conveyors (16, 17, 19, 20) for carrying coal from the pre-heating installation (10, 11) into a plurality of storage hoppers (21) and metering bins (22), a plurality of interconnecting pipes (29, 30, 31, 46, 47) ensuring maintained flow of gases through the system, there being an inert gas generator (26) for introducing inert gas into the series of conveyors, the method including the step of discharging a mixture of inert and combustible gases from the system into a gas collecting main (24) of the coking oven battery (23) to which pre-heated coal is supplied from the metering bins (22).