Abstract: Molybdenite (MoS.sub.2) is recovered from copper sulfide flotation concentrates by froth flotation utilizing steam-air injection into the concentrate flotation pulp at a temperature of about 70.degree. to 100.degree. C. in the presence of activated carbon and soluble sulfide reagents.

Abstract: A multi-step process for recovering metal values from lead smelter matte. The matte is mixed with sulfuric acid and manganese oxide and leaching is effected at atmospheric pressure to form an aqueous solution including dissolved metal sulfates and a residue containing sulfur and lead sulfate. The sulfur is removable by conventional means and the lead sulfate may be returned to the smelter. The pH of the aqueous sulfate solution is adjusted to 3.5 to 4.5 to precipitate ferric iron and arsenic and pH is readjusted to about 3.0 to redissolve coprecipitated copper. After separation from the precipitate, the aqueous solution is mixed with a sulfiding agent, such as sodium sulfide at a pH of not more than 3 to selectively precipitate copper sulfide. After separating the copper sulfide, the aqueous solution is mixed with further sulfiding agent at a pH of 3 to 4.5 to form a cobalt-nickel sulfide precipitate in which the weight ratio of copper-nickel to sulfur is 1.8.

Abstract: A system for detecting carbon monoxide, even in the presence of methane, using a catalytic sensor material having a perovskite crystal structure and a compositionA.sub.1-n B.sub.n CO.sub.3-mwhere A is a rare earth metal; B is an alkaline metal; C is a metal from the group consisting of cobalt, vanadium and maganese; O is oxygen; n is less than 0.1; and m is not greater than 0.5, which material is substantially free of oxides of A, B and C. The method of making the crystalline material involves firing appropriate amounts of mixed salts of A, B and C until substantially converted to the perovskite structure, and then leaching with a caustic to remove the undesired oxides.

Abstract: A dilution stable water based magnetic fluid is provided by dispersing magnetic particles in water with the aid of a C.sub.10 -C.sub.15 aliphatic monocarboxylic acid. The magnetic particles are preferably particles of magnetite, prepared by precipitation of dissolved iron chloride salts from aqueous solution by the use of ammonium hydroxide. The preferred acids used in preparing the dispersions are dodecanoic (C.sub.12) and tridecanoic (C.sub.13).

Abstract: Gold is desorbed from activated carbon by contacting, at a temperature of about 70.degree. to 160.degree. C., with a solution comprising about 20 to 30 percent by volume of a water soluble alcohol and about 80 to 70 percent by volume of an aqueous solution of a strong base.

Abstract: Nickel, cobalt and manganese are selectively recovered from Atlantic deep sea nodules by means of a preliminary treatment with acetic acid, followed by leaching with sulfurous acid.

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: Cations, such as copper, are recovered from very dilute aqueous solutions by means of a bubble fractionation process comprising countercurrent contacting of the feed solution with a stream of gas bubbles and a surfactant in an elongated vertical column.

Abstract: Sylvinite ores are treated for removal of insoluble slimes by a froth flotation technique which includes flocculating the slimes with nonionic or polyacrylamide flocculants and thereafter utilizing a nonionic or an anionic flotation collector including a mixture of fuel oil or a fatty acid and a defoamer of the glycol ester or polyglycol ester type. The flocculated slimes may also be floated with a fatty acid collector alone at low pH conditions.

Abstract: There is disclosed a process for scavenging iron from tailings produced by the flotation beneficiation of iron ore. This process includes the step of scavenging the flotation tailings using wet high-intensity magnetic separation (WHIMS). There is also disclosed a process for increasing the recovery of iron ore in a flotation beneficiation process. This iron ore recovery process includes the steps of feeding the magnetic concentrate produced by the scavenging process to a flotation system and then carrying out an additional flotation step.

Abstract: There is disclosed a process for producing a metastable precursor powder having about 20 to 60 percent of the silicon thereof in the nitride form. This process includes a controlled nitriding step using silicon, alumina, and either aluminum or aluminum nitride as starting materials. There is also disclosed a process for producing sialon from this precursor powder. This process includes the steps of doping the precursor powder, cold pressing or slip casting the doped powder, and then carrying out a controlled sintering step under a nitrogen atmosphere.

Abstract: A method for determining the working level exposure to airborne radioactive material by measuring the beta count per unit time. The gas radon-222 gives off three short lived daughter products commonly designated as RaA, RaB and RaC. Air, within the environment whose level is to be measured, is pumped through an opened face filter and screen assembly forming part of a detector holder mount. Radioactive particulate matter, consisting of radon-222 daughter products is collected on the filter. Thereafter, beta particles generated by the radioactive decay of the daughter products impinge upon a Geiger-Mueller tube which detects the beta particle activity per unit time. A pulse integrating system counts the detected beta particles. Based on prior experimentally calibrated results, the total count of beta particles is converted to a working level exposure.

Abstract: A catalyst for synthesis of methanol is prepared from an alloy of copper with a metal from the rare earth or actinide series or group IVB of the periodic table. The alloy is reacted with a gas having sufficient oxidizing power to oxidize the rare earth, actinide or group IVB metal.

Abstract: Asbestos fibers are removed from water by filtration through a bed of magnesium oxide.

Abstract: A method for recovering lead from lead chloride through aqueous electrolysis wherein the lead chloride is directly reduced to metallic lead on the cathode. The electrolyte may comprise liquor from the leaching of galena concentrates, which liquor includes ferrous chloride that is subsequently converted to ferric chloride during electrolysis and recycled for additional leaching.

Abstract: A resin for sorption of tungsten is prepared by copolymerization of 8-hydroxyquinoline, a polyamine, resorcinol and formaldehyde. The resin finds particular utility for recovery of tungsten from alkaline brines.

Abstract: A magnetic alloy composition, which comprises: an alloy of the formula:34 to 37 wt.% RE 55.6 to 63.9 wt.% Co 2 to 7 wt.% Cu .05 to .40 wt.% Mgwherein RE is mischmetal or a rare earth metal excluding samarium.

Abstract: Individual components of mixtures of plastic materials are separated by flotation employing sodium silicate as a wetting agent and fatty amines as promoters.

Abstract: Nickel-copper alloy is plated on a metal substrate by electrodeposition of the alloy from an acetate electrolyte solution.

Abstract: Tungsten is extracted from hot springs tungsten ores by means of a process comprising (1) calcining the ore, (2) quenching the calcined ore in aqueous alkaline solution and (3) treating the resulting slurry at elevated temperature and pressure to extract the tungsten values from the ore.