Abstract: The present invention is related to a process for increasing copper or metal recovery in flotation processes, specially of minerals that are dissolved during the grinding stage, by the use of any sulfidizing agent or ionizing sulfide such as, but not limited to, sodium hydrogen sulfide, sodium sulfide, potassium hydrogen sulfide, potassium sulfide, ammonium hydrogen sulfide or ammonium sulfide, hydrogen sulfide (H2S), polysulfides of potassium, calcium, magnesium or ammonium to precipitate during the grinding stage or immediately after the grinding stage, metals that have been dissolved prior or during the milling or grinding stage prior to normal flotation.

Abstract: The present invention relates to a nozzle for thinning of phosphine (chemical formula PH3), which is consisting in a tube-like air-inducing, a ring-like mounted split (ring split) and/or in at least one lateral mounted little tube as PH3-inducing (inducer), whereby the thickness of the split opening and/or of the opening of the little tube is maximum 1/25 of the diameter of the tube like air-inducing (inducer) and/or of the distance between the surface of an air guiding element and the inner side of the tube-like air-inducing (inducer) in the area of the PH3-entrance.

Abstract: A procedure to control pests in fruits without damaging the quality of the fruit by exposing the fruit to a high phosphine concentration at low temperature during an extended period of time.

Abstract: The present invention relates to a nozzle for thinning of phosphine (chemical formula PH3), which is consisting in a tube-like air-inducing, a ring-like mounted split (ring split) and/or in at least one lateral mounted little tube as PH3-inducing (inducer), whereby the thickness of the split opening and/or of the opening of the little tube is maximum {fraction (1/25)} of the diameter of the tube like air-inducing (inducer) and/or of the distance between the surface of an air guiding element and the inner side of the tube-like air-inducing (inducer) in the area of the PH3-entrance.

Abstract: A process and apparatus is disclosed for generating a mixture of phosphine and diluent gas(es). A hydrolysable metal phosphide, preferably magnesium phosphide, is released directly into liquid water under an atmosphere of gas inert to phosphine and in a free-flowing particulate form, composed of loose metal phosphide particles. The generated mixture of phosphine and inert carrier gas, e.g. CO2, is used as such or is diluted into a gas mixing chamber with air to a concentration below the ignitability limit before being used in fumigation. Using argon as a carrier gas the phosphine mixture is suitable for semiconductor doping.

Abstract: A process and apparatus is disclosed for generating a mixture of phosphine and diluent gas(es). A hydrolyzable metal phosphide, preferably magnesium phosphide, is released directly into liquid water under an atmosphere of gas inert to phosphine and in a free-flowing particulate form, composed of loose metal phosphide particles. The generated mixture of phosphine and inert carrier gas, e.g. CO.sub.2, is used as such or is diluted into a gas mixing chamber with air to a concentration below the ignitability limit before being used in fumigation. Using argon as a carrier gas the phosphine mixture is suitable for semiconductor doping.

Abstract: A metal phosphide composition is disclosed for generating a mixture of phosphine and diluent gas(es), presented ready for use in a hydrolysis process or apparatus in the form of a free-flowing particulate metal phosphide material composed of loose particles of said metal phosphide essentially free of metal phosphide dust, essentially free of hydrolysis retarding agents and essentially free of hydrophobic substances in the form of coatings or hydrophobizing additives. In use the hydrolyzable metal phosphide, preferably magnesium phosphide, is released directly into liquid water under an atmosphere of gas inert to phosphine. The generated mixture of phosphine and inert carrier gas, e.g. CO.sub.2, can be used as such or is diluted into a gas mixing chamber with air to a concentration below the ignitability limit before being used in fumigation.

Abstract: An apparatus and process feed at a controlled rate a free-flowing particulate material entrained in a carrier gas. The apparatus includes a gastight closed supply vessel for holding a supply of the particulate material and a riser tube inside the supply vessel, the bottom end of which is open near the bottom of the supply vessel and faces a venturi nozzle connected or adapted to be connected to a propellant gas supply. A bend at the top end of the riser tube leads by way of a duct outside the supply vessel. The riser tube includes an upwardly directed aperture at the beginning of the bend inside the supply vessel in axial alignment with the riser tube.

Abstract: The invention is directed to a process of preparing the phosphide of aluminum or magnesium comprising reacting the finely divided metal or an alloy of the two metals with yellow phosphorus at a temperature between 300.degree. and 600.degree. C. in an inert gas atmosphere and in the presence of a catalytically effective amount of the element chlorine, bromine, or iodine or a compound of such element with phosphorus, sulfur, hydrogen, ammonium, zinc, or the metal being reacted, both the yellow phosphorus in liquid form and the finely divided metal being fed into the reaction vessel slowly.

Abstract: The phosphide of aluminum or magnesium is prepared by a process comprising reacting the finely divided metal or an alloy of both metals with yellow phosphorus at a temperature between 300.degree. and 600.degree. C. in an inert gas atmosphere and in the presence of a catalyst which is chlorine, bromine or iodine or a compound of such element with phosphorus, sulfur, hydrogen, ammonium, zinc or of the metal which is being reacted.