Bizarre Patents
An electrified table cloth for preventing crawling insects from gaining access to the consumer's food or drink.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 5917116 | Method for the processing of copper minerals A method of processing a copper mineral, the method comprising activating the copper mineral by milling the copper mineral to P80 of between 2 and 20 micron, and subsequently subjecting the activated copper mineral to an oxidative hydrometallurgical treat... | 06/29/1999 |
| 5795465 | Process for recovering copper from copper-containing material The present invention provides a process that employs both non-selective flotation and oxidative leaching of the resulting concentrates to recover an increased amount of copper from porphyry copper ores. The non-selective flotation step uses collectors an... | 08/18/1998 |
| 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 |
| 4786323 | Process for the recovery of noble metals from ore-concentrates A process for the hydrometallurgical recovery of gold and silver by direct oxidizing sulphuric acid-digestion of arsenopyrite-concentrates (FeAsS2) containing carbonaceous materials with a silicate gangue, and/or a silicate and pyrite gangue wh... | 11/22/1988 |
| 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 |
| 4384890 | Cupric chloride leaching of copper sulfides A continuous process for obtaining copper from a copper sulfide by: (a) contacting a first batch of the copper sulfide with a first lixiviant containing cupric chloride, and a minimum amount of ferrous chloride to leach copper; (b) separating the leach liquor ... | 05/24/1983 |
| 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 relatively mild conditions on an aqueous slurry of the matte ... | 12/08/1981 |
| 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 |
| 4249939 | Method of disposing of spent organic complexing solutions containing cuprous halides Copper is removed from spent solutions of complexing agents containing cuprous aluminum tetrahalide, such as CuAlCl4.toluene by (1) contacting said solutions with water so as to form a precipitate of cuprous halide, an aqueous phase and an orga... | 02/10/1981 |
| 4166737 | Method for dissolving the non-ferrous metals contained in oxygenated compounds A method for the dissolution of non-ferrous metals contained in oxygenated compounds in which the oxygenated compounds are subjected to the action of a ferrous chloride solution and a gas containing oxygen is mixed with the solution.... | 09/04/1979 |
| 4149880 | Recovery of copper from arsenic containing metallurgical waste materials Highly toxic metallurgical waste materials from copper smelting and/or refining operations are processed on a cyclic basis for recovering copper values therefrom while protecting the environment from contamination. The waste materials, usually smelter flu... | 04/17/1979 |
| 4149945 | Hydrometallurgical brass dust reclamation A process for winning copper and zinc from brass mill waste products containing oxidic copper and zinc, iron, nickel, or cobalt. The feed material is leached in sulfuric acid, neutralized to a pH between about 2.5 and 3.0, and treated with zinc metal to p... | 04/17/1979 |
| 4107009 | Recovery of copper from ores and concentrates A process for extracting copper from a copper bearing ore or concentrate which comprises immersing the ore or concentrate in an electrolyte, intimately mixing with the slurry so formed finely dispersed air or other oxygen-containing gas and maintaining th... | 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 |
| 4063933 | Process for the treatment of complex lead-zinc concentrates Sulfide concentrates containing metals such as lead, zinc, copper and silver are treated to selectively recover these metals in high yields in a process wherein the concentrate is sequentially leached or extracted with sulfuric acid in the presence of oxy... | 12/20/1977 |
| 4053305 | Recovery of copper and silver from sulfide concentrates Copper and silver are recovered from complex sulfide ores or concentrates containing, in addition, metals such as lead, zinc, arsenic, antimony, and iron by leaching with a combination of ferrous chloride and oxygen.... | 10/11/1977 |
| 4030917 | Hydrometallurgical processing of metal sulfides A low pressure, low temperature, hydrometallurgical process for the recovery of metal values from chalcopyrite and other metals and other metal sulfides. The process provides for all sulfur recovery as sulfuric acid and is nonpolluting, uses no neutralizi... | 06/21/1977 |
| 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 |
