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7601314 |
Reductive ammoniacal leaching of nickel and cobalt bearing materials
A process for the recovery of nickel and/or cobalt from an impure nickel, cobalt or mixed nickel/cobalt material including the steps of: a) providing a nickel, cobalt or mixed nickel/cobalt...
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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,...
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7534407 |
Recovery of nickel
A process for recovering nickel from a solid feed material containing nickel in the form of millerite is disclosed. The process includes treating a slurry of the solid feed material and a process...
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7416711 |
Atmospheric pressure leach process for lateritic nickel ore
An atmospheric leach process in the recovery of nickel and cobalt from lateritic ores, said processing including the steps of: a) separating the lateritic ore into a low magnesium containing ore...
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7387767 |
Recovery of nickel, cobalt, iron, silica, zinc and copper from laterite ore by sulfuric acid leaching
A process for recovering nickel and cobalt values from nickel- and cobalt-containing laterite ores as an enriched mixed nickel and cobalt sulphide intermediate and for producing nickel and cobalt...
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6692710 |
Method for obtaining magnesium by leaching a laterite material
The present invention provides methods for the isolation and production of magnesium products from leaching of laterite material with acid. A magnesium compound is formed by downstream treatment of...
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6680035 |
Atmospheric leach process for the recovery of nickel and cobalt from limonite and saprolite ores
A hydrometallurgical process is provided for leaching nickeliferous laterite ores at temperatures below the boiling point of the pulp and at atmospheric pressure. The high iron fraction of the...
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6582494 |
Recovery of nickel and copper from sulphide concentrates by bioleaching
A process for recovering nickel and copper from a concentrate which includes the steps of subjecting the concentrate to a treatment phase to produce a first leach solution which contains...
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6461577 |
Two-stage bioleaching of sulphidic material containing arsenic
A method of leaching sulphidic material that contains metals and arsenic under oxidising conditions and with the aid of microorganisms is characterised by mixing the material with an acid aqueous...
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6383460 |
Process for the recovery of nickel and/or cobalt from a concentrate
A process for the recovery of nickel and/or cobalt values from a concentrate containing nickel or cobalt hydroxide comprises the steps of subjecting the concentrate to a leaching stage with an...
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6379636 |
Method for leaching nickeliferous laterite ores
A process is provided for the leaching of both the “limonite” (Fe approx. ≧25% and Mg approx. ≧6%) and “saprolite” (Fe approx. ≦20% and Mg approx. ≧10%) fractions of typical nickel...
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6379637 |
Direct atmospheric leaching of highly-serpentinized saprolitic nickel laterite ores with sulphuric acid
The present invention provides an atmospheric acid leaching process for leaching nickel and cobalt from highly-serpentinized saprolitic fractions of nickel laterite deposits that are generally too...
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6206951 |
Method for leaching nickel from nickel matte
The invention relates to a method for leaching sulfidic nickel matte and particularly copper rich nickel matte, as well as for leaching said matte together with a metallic copper and/or...
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6039790 |
Method for recovering nickel hydrometallurgically from two different nickel mattes
The invention relates to a method for recovering nickel in one and the same process from two pyrometallurgically produced nickel mattes, one of which contains a remarkable percentage or iron. The...
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5993514 |
Process for upgrading copper sulphide residues containing nickel and iron
There is disclosed a process for separating and recovering nickel and copper values from a nickel-copper matte which may contain iron and arsenic. Finely divided nickel-copper matte undergoes one...
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5628817 |
Method for leaching nickel-copper matte employing substantially neutral leaching solutions
The invention relates to a process for leaching nickel and copper from nickel-copper matte formed in pyrometallurgical nickel production by means of a multi-stage process. It is essential of the...
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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...
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4987113 |
Preparation of coal liquefaction catalyst
When low-quality iron ore is used as a coal liquefaction catalyst, in order to improve its catalytic activity it is subjected to one or a combination of reduction, heat-treatment, or washing with...
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4956157 |
Process for separating salts in seawater
A process for obtaining available elements from seawater is described, which process includes two separation steps. The first separation step involved adjusting the pH of seawater to a low pH by...
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4954322 |
Process for the recovery of metal values contained in a gangue
The invention relates to a process for the recovery of metal values contained in a ferric gangue. The process comprises the following stages: (a) dissolution of the metal values from the ferric...
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4906293 |
Hydrometallurgical process for extracting metals from ocean-mined ferromanganese nodules
An improved hydrometallurgical process for extracting metals from ocean-mined ferromanganese nodules. The process includes the steps of contacting the ferromanganese nodules in an extraction zone...
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4891130 |
Process for removing metals from aluminosilicate materials
Disclosed is a process for removing accumulated metals, particularly vanadium and nickel, from particulate aluminosilicate materials and aluminosilicate materials that are obtained by the process....
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4872909 |
Process for acid leaching of manganese oxide ores aided by hydrogen peroxide
A method of processing manganese ore by adding the ore to an aqueous solution of acid and H 2 O 2 to form a leach pulp. The leach pulp is agitated for a predetermined time period at predetermined...
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4861371 |
Nickel-containing leachate having low aluminum content
A nickel-containing ore is leached with sulfuric acid to dissolve nickel and associated metallic values into the sulfuric acid to form a leachate, the sulfuric acid further containing a source of...
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4655829 |
Metal recovery process
Metal values are separated from arsenic sulfide ores in a hydrometallurgical oxidation process using a balanced reactant slurry. The molar concentration of As and Sb in the reactant slurry is...
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4620964 |
Process for the treatment of complex manganese ores, such as marine nodules
A process for the treatment of a complex manganese ore, wherein it comprises the following stages: (a) crushing the ore, (b) subdividing the crushed ore into a first part and a second part, ...
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4619814 |
Process for the recovery of non-ferrous metals from sulphide ores and concentrates
This invention relates to the development of a viable metallurgical process capable of treating low grade concentrates, bulk concentrates, dirty concentrates, or ore directly for the recovery of...
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4571264 |
Recovery of gold from refractory auriferous iron-containing sulphidic ore
A process for recovering gold from refractory auriferous iron-containing sulphidic ore which comprises feeding ground ore as an aqueous slurry to an acidic pretreatment step. The ground ore in the...
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4562048 |
Process for the treatment of metal-bearing ores
In the hydrometallurgical treatment of metal-bearing ores and particularly the beneficiation of iron-containing titaniferous ores wherein the ore is subjected to leaching with a dilute aqueous acid...
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4557905 |
Leaching and washing a flocculated slurry having a fiber content
Particlized mineral material, such as gold ore, silver ore, or coal, is subjected to a leaching process in a manner to maximize treatment effectiveness even when the particlized mineral material...
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4548794 |
Method of recovering nickel from laterite ores
According to the present invention, processes are provided for recovery of nickel, cobalt and like metal values from laterite ores wherein the ores are separated into high and low magnesium...
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4547348 |
Conditioning of laterite pressure leach liquor
A method is provided for conditioning nickel laterite pregnant leach liquor in preparation for the recovery of nickel therefrom in which pregnant leach liquor is mixed in a reaction vessel under...
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4545816 |
Processes relating to the extraction of metals from laterites and ocean manganese nodules
The selective leaching of metal ions from various iron oxide and manganese oxide containing ores employs intermediary solutions. The leaching processes are based upon a redox acid leach step...
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4541994 |
Method of liberating nickel- and cobalt-enriched fines from laterite
According to the present invention, Ni- and Co-rich, low Mg fines may be advantageously separated from the coarse fractions of lateritic ores by atmospheric or low pressure leaching. In particular,...
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4526615 |
Cellular heap leach process and apparatus
The present invention is directed to heap leach processes for leaching metal values from ore. The heap is constructed with a plurality of cellular heaps formed by loading ore onto an impermeable...
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4472359 |
Method of pressure leaching
A process of leaching ores, ore concentrates, intermediate metallurgical products and the like, which contain acid-soluble constituents, by a treatment in an acid aqueous solution under pressure in...
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4464348 |
Selective extraction of cobalt from ores
Cobalt values are extracted from Co-containing ores or minerals by using an aqueous solution containing a reducing agent (e.g., hydrazine hydrosulfate). The leachant substantially rejects nickel...
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4442072 |
Selective recovery of base metals and precious metals from ores
Metal values are recovered from ore concentrates by forming a sulfide matte, grindng the matte, leaching with sulfuric acid at elevated temperature to selectively extract nickel and iron, and...
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4435369 |
Hydrometallurgical process for extraction of nickel
A hydrometallurgical process for extracting nickel from comminuted nickel-bearing minerals. The process includes the steps of contacting the comminuting nickel-bearing minerals in an extraction...
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4415540 |
Recovery of non-ferrous metals by thermal treatment of solutions containing non-ferrous and iron sulphates
The specification discloses a method for recovering non-ferrous metals such as zinc or copper iron from their concentrates, ores or any other metal containing materials into a solution containing...
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4410498 |
Acid leaching of nickel from serpentinic laterite ores
Sulphuric acid leaching has been used in the treatment of lateritic ores for the recovery of nickel and cobalt therefrom. However, in order to obtain good extraction from these ores, prolonged...
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4405569 |
Hydrometallurgical process for extracting metal values from complex ores containing arsenic and sulfur
This invention relates to environmentally sound hydrometallurgical methods and processes for extraction of cobalt, nickel and silver from complex concentrates. The finely ground minerals are...
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4402735 |
Treating deep sea nodules by segregation roasting
A process for recovering nonferrous nickel, copper and cobalt from deep sea nodules to obtain a concentrate rich in the nonferrous metals, a middlings less concentrated in the nonferrous metals and...
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4382082 |
Recovery of cobalt values by absorption from ammoniacal solution
The recovery of metal values such as cobalt may be improved in a hydrometallurgical recovery of metal values from metal-bearing sources such as ores and the like. The hydrometallurgical recovery...
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4362704 |
Cobalt leaching process
Cobalt is separated from a cobalt arsenic sulfide ore or concentrate by means of leaching at substantially atmospheric pressure with a ferric sulfate-sulfuric acid solution.
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4328192 |
Ammoniacal nickel leach of laterites
In a hydrometallurgical process for the recovery of metal values from a metal bearing source in which a metal bearing source is treated at a temperature in the range of from about 300° to about...
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4320022 |
Dry granular calcined magnetic fraction obtained from chrysotile asbestos tailings
There is disclosed a dry granular calcined magnetic fraction obtained from chrysotile asbestos tailings comprising as its main constituents from 25 to 43% MgO, from 25 to 43% SiO 2 , from 15 to 40%...
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4312841 |
Enhanced hydrometallurgical recovery of cobalt and nickel from laterites
The present process involves an improvement in the hydrometallurgical recovery of metal values from metal bearing sources such as ores and the like. The metal values are obtained by subjecting a...
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4304644 |
Autoclave oxidation leaching of sulfide materials containing copper, nickel and/or cobalt
A process is provided for treating a matte for selective extraction of nonferrous metals using a single stage oxidative pressure leach wherein leaching is carried out in a continuous manner and...
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4301125 |
Extraction of pre-reduced lateritic ores with aqueous sulphuric acid in the presence of peroxidant
In a process according to the present invention pre-reduced lateritic ores containing iron and nickel are leached with an aqueous sulphuric acid leach liquor containing or into which is introduced...
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