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| Number | Title | Issue Date |
| 7125436 | Method for improving metals recovery using high temperature pressure leaching The present invention is directed to a system for recovering metal values from metal-bearing materials. During a reactive process, a seeding agent is introduced to provide a nucleation site for the crystallization and/or growth of solid species which otherwise tend ... | 10/24/2006 |
| 6319389 | Recovery of copper values from copper ores Copper values are efficiently recovered from a copper ore, including secondary sulfides, by first crushing the ore to a particle size P-80 of about 1 to 2 inches, then grinding the so crushed ore to a particle size P-80 of between Tyler 4 mesh and 20 mesh... | 11/20/2001 |
| 5820653 | Process for making shaped copper articles This invention relates to a process for making a shaped copper article directly from a copper-bearing material, comprising: (A) contacting said copper-bearing material with an effective amount of at least one aqueous leaching solution to dissolve copper i... | 10/13/1998 |
| 5788740 | Method for the hydrometallurgical separation and recovery of biological nutrients, lead, gypsum and cadmium from raw materials Methods and apparatus for the hydrometallurgical separation and recovery of biological nutrients, cadmium, lead, and gypsum from raw materials such as electric arc furnace flue dust. Biological nutrients, including zinc and iron, are selectively separated... | 08/04/1998 |
| 5730776 | Hydrometallurgical process for the extraction of copper from sulphidic concentrates There is provided a novel hydrometallurgical process for the extraction of copper from sulphidic concentrates involving an oxidizing pressure leach using dilute sulphuric acid and a carbonaceous additive. The leaching step is carried out preferably at tem... | 03/24/1998 |
| 5019273 | Method for recovery of heavy metals from highly concentrated wastewater solutions Heavy metals are reclaimed from a concentrated wastewater solution containing heavy metal cations and an acid by adding to the wastewater a bed of scrap aluminum in a total amount between about 160% and about 180% of the stoichiometric requirement for com... | 05/28/1991 |
| 4789446 | Method of processing residues from the hydrometallurgical production of zinc In conjunction with an electrolytic production of zinc, the residues are processed so that the residue is leached with cell acid at a temperature from 50° to 100° C. in such a manner that a concentration of free acid from 10 to 100 g/l is obtained at th... | 12/06/1988 |
| 4610723 | Process for leaching sulphide concentrates of the tetrahedrite type containing high concentrations of arsenic and antimony A process for lixiviation of concentrates of copper sulphides of tetrahedral type containing high concentration of arsenic and antimony to recover copper and noble metals. The concentrates are repulped into an aqueous ferrous sulphate solution with an est... | 09/09/1986 |
| 4497659 | Production of metals with low selenium contents Selenium is precipitated from solutions containing at least one metal selected from the group consisting of nickel, cobalt, copper, iron, zinc, manganese, magnesium, chromium and cadmium by adding chromous sulfate to the solution to precipitate selenium t... | 02/05/1985 |
| 4304599 | Heavy metal removal process A gravity fed water bath process treats waste water from spray rinses containing compounds of copper and like heavy metals. For displacing heavy metals, such as copper, the bath has a substantially pure metal with an electrode potential greater than the h... | 12/08/1981 |
| 4294434 | Heavy metal removal apparatus A gravity fed water bath process treats waste water from spray rinses containing compounds of copper and like heavy metals. For displacing heavy metals, such as copper, the bath has a substantially pure metal with an electrode potential greater than the h... | 10/13/1981 |
| 4274931 | Leaching process for zinc sulphide containing materials A process for treating zinc sulphide materials wherein the sub-divided material is firstly leached, at less than 119° C., with a sulphate leach solution, low in sulphuric acid and having a high iron content together with zinc and impurities in a manner c... | 06/23/1981 |
| 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 electrolyte.... | 12/23/1980 |
| 4225342 | Treatment of zinc plant leach residues for recovery of the contained metal values A process for treating zinc plant leach residues for the recovery of the lead, silver, and tin values contained therein is disclosed. The process includes the treatment of the zinc plant residue with concentrated sulphuric acid followed by water leaching ... | 09/30/1980 |
| 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 the iron, the separated metal sulfate solution being expo... | 08/26/1980 |
| 4168970 | Purification of zinc sulphate solutions A method is provided for purifying zinc sulphate solutions containing copper, cadmium and cobalt impurities, which comprises, in a first stage, treating the impure zinc sulphate solution with zinc dust and an antimony and/or arsenic compound so as to form... | 09/25/1979 |
| 4107265 | Treating residues from the leaching of roasted zinc blende A process for treating a residue from the sulfuric acid leaching of roasted zinc blende, comprising (a) leaching the residue in a single stage with sulfuric acid and a metal sulfide supplied in a quantity sufficient for transforming the iron into divalent... | 08/15/1978 |
| 4093526 | Hydrometallurgical leaching and refining of nickel-copper concentrates, and electrowinning of copper A multi-stage leaching process is provided for leaching and refining nickel-copper-sulfur concentrates, a substantial portion of the total nickel present being in an acid-soluble metallic form. The process employs a first stage atmospheric leach in combin... | 06/06/1978 |
| 3957602 | Recovery of copper from chalcopyrite utilizing copper sulfate leach Copper is recovered from chalcopyrite by means of a pollution-free hydrometallurgical process which entails leaching and converting the chalcopyrite with copper sulfate in order to produce an insoluble copper sulfide, a soluble iron sulfate and sulfuric a... | 05/18/1976 |
| 3933478 | Recovery of zinc and copper from brass scrap Process for receovering copper values (and zinc, if present) from copper bearing materials, optionally in admixture with iron. The feed material is leached with a mixture of nitric and sulphuric acids, after which the dissolved copper is cemented from sol... | 01/20/1976 |
| 3930847 | Recovery of copper by cementation The method of recovering copper by cementation using copper-iron materials as part of the cementation scrap, the copper and iron in said materials being substantially physically inseparable.... | 01/06/1976 |
