Aluminum is recovered from scrap by volatilization of organics from the scrap in a non-oxidizing furnace having multiple hearths, and thereafter separating the aluminum from the ash by mechanical means.

Crystal platelets of basic lead carbonate which are suspended in the mother liquor are classified according to size by means of a wet cyclone classifier. An underflow stream is recovered from the wet cyclone classifier and contains crystal platelets having an average diameter within the range of about 10 to about 20 microns. Platelets having an average diameter in this range are especially preferred since they are pearlescent and have a luster and brilliance which equals or excells that of natur...

Low-grade molybdenite flotation products are leached with water at elevated temperature and pressure in an oxidizing atmosphere to selectively dissolve copper, with some sulfur and iron, from sulfide minerals normally present so as to increase the recovery of molybdenite in marketable concentrates.

Apparatus for treating ore pulp in a treatment cell attendant to recovery of minerals therefrom, the apparatus having a rotatable shaft with an attached impeller and a radially projecting annular disc, the disc including a plurality of projections attached thereto and a cylindrical collar disposed above the disc and joined thereto, thus forming a rotating standpipe so that the path of flow of ore pulp through the eye of the impeller is well defined. A stabilizer ring is joined to the cell adjace...

A light gas, namely hydrogen or helium, of increased purity is obtained from a gaseous mixture consisting predominantly of the light gas by passing the mixture through a rotating gas centrifuge under conditions such that gaseous impurities are condensed and a light gas stream of increased purity is recovered. The process may be applied to a light gas concentrate obtained from a gaseous mixture by separation of the constituents other than the light gas by low-temperature condensation, in which ca...

A personnel locating and recovery system utilizes a radar corner reflector omprising a flexible membrane or diaphragm which is actuable by voice to modulate radar energy reflected toward a searching radar equipped to detect the modulation for recognition and identification purposes. In a preferred embodiment the reflector is foldable to pocket size.

A crude hydrocarbon mixture containing isoprene and isobutene in addition to formaldehyde monomer and polymers, such as is obtained by cracking 4,4-dimethyl-1,3-dioxane, is subjected to distillation in a column which is supplied near its head with liquid water, fouling of the column thereby being reduced and the distillate being obtained in higher purity.

Copper is recovered from copper-containing materials, such as scrap or ores, by leaching with cupric ammonium carbonate solution, followed by addition of elemental sulfur to precipitate copper sulfide and regenerate the cupric ammonium carbonate leach solution.

Low grade, finely disseminated copper oxide ores are beneficiated to enhance the winning of metallic copper therefrom by crushing and sieving the ore to particles of suitable size, preheating the ore particles, reacting a chlorine-donating gas with the ore particles at a controlled elevated temperature to form copper chloride (preferably cuprous chloride) therein and maintain it substantially in molten liquid form, and then reducing the molten liquid form, and then reducing the molten liquid cop...

The specification describes a method of recovering molybdenum from molybdenum containing ore wherein the ore is subjected to the conventional process steps of concentrating, roasting, and ammonia leaching followed by novel procedures to remove the copper from the leach solution without the necessity of adding an agent to precipitate the contaminant copper. The copper contaminate in the leach solution is precipitated out of the solution by (1) partial evaporation of the leach solution followed by...