Abstract: A process for extracting arsenic from aqueous solutions containing alkali metal carbonate, sulfate and hydroxide or hydrogen carbonate, at least one metal selected from the group consisting of vanadium, uranium and molybdenum in the form of an alkali metal salt, and inorganic and/or organic impurities, comprising the steps of caustifying the solution with lime to convert the alkali metal carbonates into hydroxides to precipitate the insoluble calcium salts formed, concentrating the solution by evaporation of the effluent liquids originating from the caustification step to obtain a precipitate substantially comprising alkali metal sulfate wherein the caustification is performed in two steps, consisting of (a) treating the solutions with an amount of lime approximately equal to but less than the stoichiometric amount necessary to convert the alkali metal carbonates into hydroxides as a first precipitate, and (b) after separating and washing the first precipitate, treating the resulting liquor with at least the

Abstract: Gallium values are extracted and recovered from basic aqueous solutions thereof, notably from sodium aluminate solutions of Bayer process origin, by liquid/liquid extraction thereof with a water immiscible organic phase comprising an organic solvent having dissolved therein an organic-soluble substituted hydroxyquinoline and at least one organic-soluble organosulfate or organosulfonate comprising at least one acid function, either in the free acid or salt form thereof.

Abstract: Process for the recovery of molybdenum from an organic solution, such as a spent catalyst solution obtained from the molybdenum catalyzed epoxidation of an olefinically unsaturated organic compound with an organic hydroperoxide as oxidizing agent and removal from the crude epoxidation mixture of product epoxide and the alcohol corresponding to the hydroperoxide, said process comprising:(a) admixing the organic solution with water in an amount between about 0.5 and 10 percent, based on the weight of the organic solution;(b) heating the resultant admixture to a temperature in the range of between about 150.degree. C. and 250.degree. C. under pressure sufficient to maintain the admixture in the liquid phase and for a time sufficient to precipitate at least a portion of the molybdenum contained in the organic solution as a solid; and (c) separating the precipitated molybdenum containing solid from the organic solution.

Abstract: This invention provides a process for the preparation of ferrimagnetic spinel fibers composed of crystallites corresponding to the formula:M.sub.1 Fe.sub.2 O.sub.4where M is a divalent metal such as manganese, iron, cobalt, nickel, copper, zinc, cadmium, magnesium, barium, strontium, or any combination thereof.

Abstract: A process for preparing manganese sulfate solutions having reduced concentrations of potassium impurity is disclosed wherein a digestion mixture of a reduced manganese ore, a source of water soluble aluminum ions, a source of water soluble ferric ions and an aqueous acid solution is prepared, having a solution pH ranging from about 0.5 to about 3.5. The mixture is then digested at a temperature sufficient to produce a mixed digestion product comprising a liquid phase of a manganese sulfate solution and a solid phase of digested ore residue and a particulate complex salt by-product. The liquid phase of manganese sulfate solution is then recovered from the mixed digestion product. An additional feature of this process involves conducting the digestion of the digestion mixture in the presence of at least one complex salt of the general formula:MFe.sub.n Al.sub.3-n (SO.sub.4).sub.2 (OH).sub.6where M is Na.sup.+, K.sup.+ or NH.sub.4.sup.+ and n is a number ranging from about 1 to about 3.

Abstract: A process for the preparation of manganese sulfate solutions having reduced levels of potassium impurity comprising blending a reduced manganese ore, an added source of water soluble aluminum ions and an aqueous acid solution to form a digestion mixture, digesting said mixture, preferably in the presence of crystals of a complex potassium-aluminum salt to form a mixed reaction product containing a liquid phase of manganese sulfate solution and recovering the liquid phase of manganese sulfate solution from said mixed reaction product.

Abstract: The invention relates to a process for the recovery of valuable metals from sulfidic, silicate-containing raw materials by slurrying the raw material in water, by subjecting the slurry to a selective leach under atmospheric conditions and in an acidic milieu, and by separating the valuable-metal containing solution from the solid leach residue.When the leach is carried out by introducing an oxygen-bearing gas into the slurry which contains finely-divided sulfide and carbon, the acidity of the slurry drops in a controlled manner so that a high efficiency of oxygen, and a high selectivity of the leach as regards valuable metals, are obtained. Owing to the presence of carbon the oxygen is reduced very easily and so oxygen efficiency is high and the rate of dissolving of the valuable metals increases in the slurry mixture.

Abstract: Tungsten and molybdenum are recovered from sulfur bearing material such as sulfide sludges by a pollution free process in which the sulfur bearing material is heated with agitation in an aqueous solution of sodium carbonate to form water soluble molybdenum and tungsten compounds without forming any appreciable amount of water soluble sulfur compounds. The reaction mixture is oxidized to convert partially reduced tungsten values or molybdenum values to sodium tungstate and sodium molybdate respectively. The liquid phase containing tungsten and molybdenum is separated from the solid phase containing free sulfur.

Abstract: Alkali metal beryllium tetrahydride is produced by subjecting a mixture of beryllium and an alkali metal aluminum complex of the formulaMAlR.sub.m H.sub.nwherein M is an alkali metal, R is a hydrocarbyl group, m is an integer from 1 to 4, n is an integer from 0 to 3, the total of m and n being 4, to a pressurized atomsphere of hydrogen and an elevated temperature at which alkali metal beryllium tetrahydride of the formula M.sub.2 BeH.sub.4 is produced.

Abstract: Alkali metal beryllium tetrahydride is produced by subjecting a mixture of beryllium and an alkali metal beryllium complex of the formulaMBeR.sub.m H.sub.nwherein M is an alkali metal, R is a hydrocarbyl group, m is an integer from 1 to 3, n is an integer from 0 to 2, the total of m and n being 3, to a pressurized atmosphere of hydrogen and an elevated temperature at which alkali metal beryllium tetrahydride of the formula M.sub.2 BeH.sub.4 is produced.

Abstract: We have discovered that by pretreating a thioether (R'--S--R) containing organic phase to be used as an extractant in a solvent extraction process for separating platinum group metals from base metals and/or each other in aqueous solution with a mild oxidant, e.g., cupric chloride, in an acidified aqueous phase, the tendency of stable emulsion formation during extraction can be substantially eliminated.

Abstract: During the final stages of Al(OH).sub.3 production, deliquoring the aluminum trihydroxide slurry of excess sodium ions in the form of caustic liquor is conventionally achieved by numerous water washes prior to drying the product. Addition of an effective amount of highly charged, high molecular weight anionic polymer flocculant to the aluminum trihydroxide slurry improves the filtration rate, i.e., increases the amount and rate of removal of caustic liquor from the slurry. Addition of the flocculant reduces the amount of washing necessary to remove sodium ions from the final cake and also provides higher cake solids which results in greater production per unit time and less expenditure of energy in the drying process. Anionic polymers derived from 80 to 100% of an anionic vinyl monomer such as acrylic acid and from 20 to 0% of a nonionic vinyl monomer such as acrylamide having molecular weights between 1.5 to 12.0.times.10.sup.6 are useful in deliquoring aluminum trihydroxide slurries.

Abstract: When subjecting a mixture of beryllium and an alkali metal aluminum complex of the formulaMAlR.sub.m H.sub.nwherein M is an alkali metal, R is a hydrocarbyl group, m is an integer from 1 to 4, n is an integer from 0 to 3, the total of m and n being 4, to a pressurized atmosphere of hydrogen and an elevated temperature, a solid reaction product is produced. This product, composed of M.sub.2 BeH.sub.4 and other solid components, is mixed with an inert liquid diluent having a specific gravity above that of the M.sub.2 BeH.sub.4 but below that of essentially all of the other solid components. A separation is effected in this diluent between the M.sub.2 BeH.sub.4 and essentially all of such other solid components, and the M.sub.2 BeH.sub.4 is recovered.

Abstract: A process is provided for extracting vanadium values from a vanadium-bearing ore in which a carbonaceous material is added to a salt roast mixture containing ore and an alkali metal salt, e.g., NaCl. The mixture is subjected to roast temperatures (e.g., 825.degree. C.) for a period of time sufficient to burn off substantially all of the carbon in the mixture. The carbonaceous material is preferably a vanadium-containing carbon source, e.g., residue from the combustion of heavy petroleum oil.

Abstract: A gel suitable for fiber formation is produced by reacting a Group II water soluble metal oxide with an aluminum chlorohydrate-organic complex to form a complex which is hydrolyzed and dried at elevated temperatures.

Abstract: A leaching process employing acidic chloride solutions, whereby the iron content of aluminous materials such as lower grade iron-containing bauxite ores is reduced, enabling the obtention of valuable products such as metallurgical grade alumina and refractory grade bauxite, previously obtainable only from higher grade low-iron aluminous materials.

Abstract: A process for the recovery of valuable metals from roasted crude-oil sulfur-extraction catalyst waste is disclosed. In this process the value metals can be separated from aluminum in a single stage by treating the waste at elevated temperature and pressure with such an amount of sulfate solution that the waste dissolves and the aluminum simultaneously precipitates as alunite, which is separated from the solution which contains the other value metals. A sulfate solution is preferably added in such an amount that the concentration of sulfuric acid in the solution is 2-30 g/l at the end of the stage.

Abstract: This invention provides an improved process for producing a microcrystalline ferrimagnetic spinel via an amorphous organometallic precursor.The process produces a high purity ferrite powder such as Ni.sub.0.7 Zn.sub.0.3 Fe.sub.2 O.sub.4 which has an average particle size less than about 1000 angstroms.

Abstract: Vanadium values are recovered from sulphur-containing cokes and ashes derived from heavy oils by a novel process comprising heating in the presence of alkali metal carbonate, contacting the resulting solid residue with water to form a leach and recovering the vanadium values dissolved therein. The amount of alkali metal carbonate used is at least sufficient to convert the vanadium values present in the raw material into alkali metal vanadate, but insufficient to react in addition with all of the sulphur values therein. The heating step solubilizes only alkali metal vanadate and thus the leach solution is substantially free of contaminating substances.

Abstract: Ferrite having a uniform degree of oxidation is produced at a higher rate of ferrite forming reaction by pelletizing a mixture of iron oxide and ferromanganese powders and calcining the mixture at a temperature of 900.degree. C. or higher. Zinc oxide, magnesium oxide and/or nickel oxide may be further added to the mixture, as required.