Matches 1 - 50 out of 110 1 2 3 >


Match Document Document Title
7871584 Consecutive or simultaneous leaching of nickel and cobalt containing ores  
A process for the recovery of nickel and cobalt from nickel and cobalt containing ores, including the steps of first leaching a laterite ore and/or a partially oxidized sulfide ore with an acid...
7854909 Method and device for treating a fine-particled feedstock especially containing metal  
A process for treating a finely particulate, in particular metal-containing, charge material: The charge material and a treatment gas, in particular a reduction gas, are introduced into a fluidized...
7799296 Method of producing a nickel salt solution  
A method for converting nickel into a nickel salt solution. Nickel is dissolved and reacted in an oxygen-enriched acidic solution to produce a nickel salt solution as illustrated in the following...
7736606 Process for the recovery of value metals from base metal sulfide ores  
A process for leaching a value metal from a base metal sulfide ore, comprising the step of leaching the ore with a lixiviant comprising a chloride, an oxidant and hydrochloric acid is disclosed....
7713500 Leaching process  
A process for the oxidative leaching of sulphide mineral species, the method characterized by the method steps of: leaching a slurry containing the mineral species in one or more reaction vessels;...
7563421 Hydrometallurgical process of nickel oxide ore  
A hydrometallurgical process based on pressure leaching at elevated temperature for recovering nickel from nickel oxide ores, characterized by a simplified and efficient process as a whole,...
7438874 Pressure oxidation leaching in the presence of an acidic solution of halide and sulfate ions from copper and base metal containing ore/concentrate  
A process for the extraction of a base metal such as Ni, Co or Zn, from suiphide ore or concentrate containing copper and the base metal comprises the step of subjecting the ore or concentrate to...
7364717 Process for converting nickel to nickel sulfate  
A preferred embodiment of the present invention provides a process for making nickel sulfate by converting nickel metal into nickel sulfate, which may be converted to nickel hydroxide. Nickel metal...
6267800 Process for producing cobalt metal powder from nickel-cobalt sulphides  
A process for producing cobalt metal powder from nickel-cobalt sulphides wherein said nickel-cobalt sulphides are leached in an ammoniacal ammonium sulphate solution under an elevated pressure of...
6264904 Process for recovery of cobalt by selective precipitation of cobalt-calcium double salt  
There is provided a process for the recovery of cobalt as cobalt (III) hexammine sulphate, comprising adding an effective amount of a calcium sulphate slurry to an ammoniacal ammonium sulphate...
5853692 Process for manufacturing high purity nickel chloride by recycling waste nickel anode  
A process for manufacturing nickel chloride is disclosed which is used as the raw material for manufacturing Zn--Ni coated steel plates, for electroless Ni plating industries, for electronic...
5344479 Upgrading copper sulphide residues containing nickel and arsenic  
A process is disclosed for separating and recovering nickel and copper values from a nickel-copper matte which may contain iron and arsenic. Finely divided nickel-copper matte is leached in aqueous...
5271909 Method of tellurium separation from copper electrorefining slime  
A method of increasing the extraction of tellurium from copper electrorefining slime comprises leaching the slime with dilute sulphuric acid in a reactor under a partial oxygen pressure of up to...
5229088 Process for recovery of nickel and magnesium from a naturally occurring material  
A process is disclosed for recovering nickel and magnesium from natural material by extracting them in the presence of a spent sulfur containing iron based hydroconversion catalyst, under oxidative...
5194240 Manufacture of ferric sulphate  
A process for the manufacture of ferric sulphate from ferrous sulphate in a closed circuit or vessel comprising a liquid phase and a vapor phase, wherein the vapor phase is essentially a closed...
5006320 Microbiological oxidation process for recovering mineral values  
A process for the biological oxidation of sulfide in sulfide-containing ore. Preferably, the ore is then subjected to cyanide leaching. The resulting leach tail solution can be subjected to cyanide...
4919906 Processes and equipment for production of elemental phosphorus and thermal phosphoric acid  
New processes and equipment are disclosed for producing elemental phosphorus and thermal phosphoric acid. Benefits are listed below. 1. Phosphorus-containing solids are recycled to smelting...
4834793 Oxidation process for releasing metal values in which nitric acid is regenerated in situ  
An oxidation process for releasing a metal of interest in an ore is described. The process is especially useful for releasing a metal of interest entrapped in a refractory ore. The process...
4828809 Separation of nickel from copper in autoclave  
Nickel is separated from copper contained in predominantly nickel- and copper-bearing sulphidic matte and alloys by chlorine leaching in an autoclave at over-atmospheric pressure. The leaching is...
4816236 Recovery of vanadium and nickel from petroleum residues  
A process is provided for the recovery of vanadium and nickel values from petroleum residues and, in particular, from Flexicoke. In the process, Flexicoke is blended with an alkali metal source,...
4789529 Recovery of zinc from zinc bearing sulphidic ores and concentrates by controlled oxidation roasting  
A process is described for the controlled oxidation roasting of zinc bearing sulphidic ores and concentrates by adjusting the furnace temperature and residence time together with the oxygen...
4778520 Process for leaching zinc from partially desulfurized zinc concentrates by sulfuric acid  
A process comprises leaching zinc oxide either separately or in conjunction with iron oxides from a partially desulfurized zinc bearing sulfide ore of concentrate. The ore is pretreated to...
4647307 Process for recovering gold and silver from refractory ores  
A process for the hydrometallurgical recovery of precious metal from an ore or concentrate containing at least some arsenopyrite or pyrite. The process comprises forming in a common volume space a...
4608235 Recovery of cobalt  
A process is disclosed for recovering cobalt from an alloy containing other metals as chromium, tungsten, etc. The process involves first adding the alloy to fused sodium hydroxide at a temperature...
4606764 Method of recovering metals from ores using a formate reducing agent  
The invention comprises the treatment of metal oxides and mixed metal oxides and metal sulfides in a vertical tube reactor system having a downcomer section and a riser section in order to oxidize...
4571262 Recovery of platinum group metals from nickel-copper-iron matte  
A process for separately recovering platinum group metal values, nickel values and copper from nickel-copper-iron sulphidic matte containing platinum group metals includes leaching ground matte at...
4435368 Hydrometallurgical process for selective dissolution of mixtures of oxy compounds  
The invention provides a process for the selective dissolution of oxygenated compounds containing at least one non-ferrous metal selected from the group consisting of nickel, zinc, and copper,...
4416693 Recovery of titanium metal values  
Titanium metal values may be recovered from a metal-bearing source containing titanium and iron by subjecting the source to an oxidation treatment and a reductive roast. After having crushed the...
4377410 Chromium recovery from superalloy scrap by selective chlorine leaching  
To recover chromium and other metals from scrap such as superalloy scrap, the scrap is sulfided to provide a molten matte which is cooled and fragmented, the fragments are leached selectively in an...
4376653 Process for the production of nickel, high-purity magnesium oxide and cement  
Sulphuric acid leaching is applied to recover nickel from a nickel-containing oxidic raw material which also contains magnesium and iron. High-purity magnesium oxide and cement are produced at the...
4350668 Recovery of cobalt component from 3-pentenoic ester synthesis  
In a process for producing a 3-pentenoic ester which comprises reacting butadiene, carbon monoxide and an alcohol in the presence of a solvent and a catalyst selected from cobalt carbonyl or cobalt...
4343774 Method for recovering valuable metals from deactivated catalysts  
Cobalt is recovered in substantial amounts from spent catalyst particles comprising cobalt components supported on alumina or other aluminum-containing refractory oxides. The process comprises...
4331635 Recovery of copper and/or nickel and/or zinc  
Copper, nickel and zinc are recovered from sulfide minerals or concentrates thereof by leaching with ammonia at or near atmospheric pressure. A slurry of such minerals or concentrates in an aqueous...
4331469 Process for the recovery of silver values from silver-containing material which also contains iron and arsenic  
A process for the recovery of silver values from silver-containing material which also contains iron and arsenic includes leaching the material under oxidizing conditions at elevated temperature...
4322390 Hydrometallurgical recovery of copper, cobalt nickel with reductive and oxidative leaching  
Desired metal values are recovered from metal-bearing sources by subjecting said metal-bearing sources to a reduction step which is effected in an aqueous solution of an ammoniacal ammonium salt...
4311520 Process for the recovery of nickel, cobalt and manganese from their oxides and silicates  
A process for the recovery of nickel, cobalt or manganese from their oxides or silicates wherein such process, which requires the application of heat, is improved by utilizing microwave energy as...
4307066 Extraction of metals from mixtures of oxides or silicates  
Metals are extracted from mixtures of oxides or silicates by reacting the mixture at elevated temperature with a gaseous chlorinating agent comprising a mixture of water vapor and hydrogen chloride...
4298582 Vanadium recovery from scrap alloys  
Disclosed is a process for recovering chromium, vanadium, molybdenum, and tungsten from secondary resources such as alloy scrap comprising a refractory metal and base metals such as cobalt, nickel,...
4280986 Method for separating metal values from sea nodules  
A process for separating metal values from sea nodules by sulfating the nodule ore under substantially dry conditions, followed by leaching of the sulfated ore; separation of the leaching solution...
4201748 Process for thermal-activation of chalcopyrite-pyrite concentrates  
A process for thermal activation of chalcopyrite-pyrite ore concentrates for activation of iron values in both chalcopyrite and pyrite constituents whereby said iron values can be selectively...
4200455 Hydrometallurgical recovery of metal values  
The present process involves an improvement in the hydrometallurgical recovery of metal values from metal bearing sources such as ores and the like. When subjecting a metal bearing source to a...
4189461 Metal leaching from concentrates using nitrogen dioxide in acids  
Sulfidic minerals containing metal values such as copper, silver, nickel, cobalt, molybdenum, zinc, iron, or mixtures thereof are leached in two stages. In the second stage, preleached minerals are...
4153522 Sulfate precipitation during oxidative ammonium leach of Cu, Ni, Zn sulfide ores  
In the recovery of copper, nickel or zinc from sulfide ores by leaching with ammonium sulfate solution containing free ammonia in the presence of oxygen to form a leach solution containing...
4144310 High slurry density sulfidic mineral leaching using nitrogen dioxide  
An energy efficient process is disclosed for the hydrometallurgical oxidation of sulfidic minerals containing copper, silver, nickel, cobalt, molybdenum, or zinc values. A high density slurry,...
4137291 Extraction of metal values from manganese nodules  
This invention provides a two-stage leaching procedure for manganese nodules for obtaining directly in one leaching stage the metal values other than manganese in one ammoniacal aqueous solution....
4132758 Copper leaching employing nitrogen dioxide as oxidant  
Sulfidic minerals containing metal values such as copper, silver, nickel, cobalt, molybdenum, zinc, iron, or mixtures thereof are oxidized with nitrogen dioxide to enable the metal values to be...
4130626 Flotation separation of iron oxide from undigested matte particles obtained from autoclave leach residues  
Undigested matte particles in autoclave leach residues containing iron oxide are separated from iron oxide by subjecting an aqueous slurry thereof to flotation without the use of a flotation...
4113471 Extraction of non-ferrous metal values from dolomitic oxide ores  
A process for extracting non-ferrous metal values from an oxide ore. The process comprises leaching the ore with a solution containing at least one alkali metal chloride or alkaline earth chloride...
4107262 Cuprion process start-up control  
A process in which copper, nickel, cobalt and molybdenum are recovered by reducing comminuted raw manganese nodules with an aqueous solution containing cuprous ions. An improvement is disclosed in...
4094754 Leaching of Ni-Cu-Fe-S matte  
Nickel is selectively leached efficiently and rapidly from Ni-Cu-Fe-S matte under oxidizing conditions at ordinary pressure by controlling in combination the following variables: (1) the...
Matches 1 - 50 out of 110 1 2 3 >