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6696037 |
Method of recovering sulfur from minerals and other sulfur-containing compounds
A sulfurous compound such as a sulfur-rich “float” (concentrate) obtained by flotation of the residue from the leaching of a zinc concentrate is heated at a temperature not lower than the...
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6391270 |
Method for removing manganese from acidic sulfate solutions
A method and apparatus for precipitating manganese from acidic sulfate solutions, and more specifically from zinc leach solutions, without removing zinc. A zinc- and manganese-containing solution...
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6383255 |
Method for recovering the valuable metal content of a sulphuric acid leaching solution
A method for winning the valuable metal content of a leaching solution acidified with sulphuric acid, by solvent extraction and electrowinning and a following final product winning stage, for...
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RE37251 |
Chloride assisted hydrometallurgical extraction of metal
A process for the extraction of a metal from an ore or concentrate comprises subjecting the ore or concentrate to pressure oxidation in the presence of oxygen and an acidic solution containing...
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6162346 |
Process for recovery of zinc from sphalerite containing ores or concentrates
A process for recovery of zinc from sphalerite containing ores or concentrates, whereby, in a first step, these ores or concentrates are submitted to a thermal treatment consisting essentially of a...
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5993635 |
Atmospheric mineral leaching process
A method is provided for processing a sulphide mineral composition which at least partly comprises an iron-containing mineral. The method includes the steps of: (a) milling said composition to a...
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5876588 |
Process for removing and recovering copper, silver and zinc from sulfide ores
Ores containing copper, zinc, silver in the form of sulfides are treated by a solution of sulfurated sulfite ions and ammonium ions in order to remove most of the metals from the sulfide ores. This...
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5711922 |
Preferential hydrometallurgical conversion of zinc sulfide to sulfate from zinc sulfide containing ores and concentrates
A hydrometallurgical process for converting zinc sulfide in an ore containing zinc sulfide, said zinc sulfide being chemically converted at elevated temperatures to ZnSO 4 .xH 2 O which...
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5575907 |
Process for the recovery of raw materials from presorted collected waste, especially scrap electrochemical batteries and accumulators
The invention relates to a process for the recovery of raw materials from presorted collected waste, especially scrap electrochemical batteries and accumulators in which the scrap (10)is first...
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5244491 |
Method of extracting zinc lead and silver from brines
The present invention provides a novel method of extracting zinc from geothermal brines and synthetic brines which can be performed in a continuous, in-line process.
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5188713 |
Process for recovery of metal
A process for recovery of metal from a feedstock comprising copper is provided. The process comprises the steps of: (a) contacting the feedstock with an aqueous mixture comprising ammonium...
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4832925 |
Recovery of zinc from zinc-containing sulphidic material
A process for the recovery of zinc from zinc-containing sulphidic material which also contains iron and from zinc oxide containing material, at least one of the materials containing lead and/or...
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4828661 |
Process for recovery of metals from metal/plastic waste
The invention relates to a process for recovery of metals from metal/plastic waste using used etching and washing solutions from the electronics industry, with the following process steps: (a)...
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4710277 |
Method for manufacturing zinc hydrometallurgically
The present invention relates to a method for manufacturing zinc hydrometallurgically from zinc-containing starting materials. The method comprises one or more leaching stages, one or more solution...
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4698139 |
Hydrometallurgical method for treating valuable metal raw materials containing chlorides and fluorides
The purpose of the method is to remove chlorides and fluorides from a valuable metal raw material by leaching the raw material into sulphuric acid solution and by crystallizing the valuable metal...
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4652352 |
Process and apparatus for recovering metals from dilute solutions
A process and apparatus are provided for recovering metals from dilute solution utilizing ion exchange and, optionally, electrolytic recovery. Ammonium salt regeneration solutions for use in the...
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4557908 |
Process for the treatment of a purge solution particularly intended for a process for the extraction of zinc by electrolysis
The invention relates to the treatment of purge solutions formed in the process of the extraction of zinc by electrolysis. According to the invention, the purge solution, which consists of a part...
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4379037 |
Removal of manganese and chloride ions from aqueous acidic zinc sulphate solutions
A process for removing manganese and chloride ions from an aqueous acidic sulphate solution containing zinc, manganese and chloride ions without removing a substantial amount of zinc ions from the...
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4345980 |
Electrowinning of zinc
In the process for electrowinning of zinc from acid zinc sulfate electrolyte, electrolyte is recirculated to the cells and a portion of the electrolyte is returned to the leaching operation of...
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4317803 |
Recovery of non-ferrous metals by thermal treatments of solutions containing non-ferrous and iron sulphates
The specification discloses a method for recovering non-ferrous metals such as zinc or copper from their concentrates, ores or any other metal containing materials into a solution containing these...
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4290866 |
Removal of manganese ions from zinc and manganese containing solutions
A process for removing manganese ions from aqueous acidic sulphate solutions containing zinc and manganese ions, without removing a substantial amount of zinc ions from solution, includes treating...
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4266972 |
Process for non-ferrous metals production from complex sulphide ores containing copper, lead, zinc, silver and/or gold
Metal sulphide ore is leached by water under a low pressure and oxidizing atmosphere to dissolve zinc and copper, hydrolyze iron to hematite, and leave lead and precious metals as insoluble...
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4263109 |
Precipitation of chloride from zinc sulphate solution
A process is described for the removal of chloride impurity from zinc sulphate solution. The process comprises the steps of forming a slurry of said solution with an inert particulate support...
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4240826 |
Process for the recovery of arsenic as a zinc arsenate and its _utilization in the purification of zinc plant electrolytes
The invention described herein relates to metallurgical processes for the recovery of zinc arsenate from cement copper cake residues, and the use thereof in the purification of impure zinc...
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4219354 |
Hydrometallurgical process for the treatment of oxides and ferrites which contain iron and other metals
A hydrometallurgical process for the treatment of a raw material which contains iron and other metals, with a sulfuric acid solution, in order to dissolve the metals and to precipitate and separate...
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4070260 |
Process of sulfuric acid leaching silicated zinc ores
A process of leaching silicated zinc ores with sulfuric acid in which the ore is reacted at elevated temperature with at least a stoichiometric amount of sulfuric acid, treating products of the...
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4049514 |
Zinc hydrometallurgical process
Hydrometallurgical process for the recovery of copper arsenate from zinc plant cement copper residues and the use thereof in the purification of zinc electrolyte, with the attendant upgrading of...
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4030989 |
Electrowinning process
Metals from sulfate leach solutions derived from sulfide ores are electrowon in a cell divided by a permionic membrane whereby metal pregnant solution is fed to the cathode compartment and sulfuric...
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3979266 |
Process for purifying aqueous solutions, of metal ions precipitating as arsenides, antimonides, tellurides, and selenides
A process for purifying aqueous solutions, of metal ions precipitating as arsenides, antimonides, tellurides, selenides, and tin and mercury alloys, wherein arsenic, antimony, tellurium, selenium,...
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3937658 |
Electrolytic zinc refining process including production of by-products from jarosite residues
The jarosite process of electrolytic refining of zinc is extended and improved by treating the jarosite residues to recover valuable by-products. The wet jarosite residue is acidified with...
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3905882 |
Electrolytic zinc salvaging method
A continuous method for salvaging zinc from scrap wherein: electrowinning cells having a series of anodes and cathodes in electrical parallel and a plurality of leach tanks in which a solution of...
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3787306 |
PROCESS FOR THE CONCURRENT RECOVERY OF ACID AND METAL VALUES FROM SPENT PICKLE ACID CONTAINING THE SAME
A process for the concurrent recovery of acid and metal values from spent pickle acid containing the same which comprises: A. adding a quantity of sulfuric acid to the spent pickle acid other than...
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3656941 |
HYDROMETALLURGICAL TREATMENT OF SILICEOUS ZINC ORES
A process for the recovery of metal values from a siliceous zinc ore whereby the ore is treated with aqueous sulfuric acid in a continuous manner in a first and second stage, in at least two...
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3655538 |
PROCESS FOR ELECTROWINNING ZINC FROM SULFIDE CONCENTRATES
This disclosure is directed to leaching zinc sulfide concentrates to facilitate the production of zinc and sulphur. solution. To provide for increased recovery the copper sulfate leach The zinc...
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3494841 |
PROCESS OF SELECTIVE FLUORINE REMOVAL FROM ZINC CONCENTRATES AND MANGANESE DIOXIDE
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3464814 |
LEACHING ZINC PLANT PURIFICATION RESIDUE
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3143486 |
Recovery of zinc from zinc plant residue
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3095363 |
Calcination of zinc sulfide concentrates
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2996440 |
Method for the production of zinc
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2874041 |
Process of zinc extraction from ores formed by or containing zinc silicate or other soluble silicates, by means of hydrometallurgy
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