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| Number | Title | Issue Date |
| 6753197 | Opto-electronic device integration A method of creating a hybridized chip using a top active optical device combined with an electronic chip having electronic chip contacts, when at least some of the active device contacts are not aligned with at least some of the electronic chip contacts, each of th... | 06/22/2004 |
| 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 melting point of sulfur but below its boiling point, preferably not... | 02/24/2004 |
| 6476287 | Sulfite treatment of spent industrial wastes A method of treating metal-contaminated spent foundry sand, or other industrial waste, by combining the sand with a sulfite to produce insoluble metal sulfur oxide complexes that do not leach from the sand. The treated waste may also be processed to reduc... | 11/05/2002 |
| 6475462 | Process and apparatus for treating particulate matter The present invention provides a process for treating a particulate material, in which particles of the material to be treated interact with non-static particles of a second material, the process comprising the steps of: (i) providing a processing chamber... | 11/05/2002 |
| 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 heating cycle performed under non-oxidizing conditions ab... | 12/19/2000 |
| 6143259 | Treatment of pyrite and arsenophrite containing material with ferric ions and sulfur dioxide/oxygen mixture to improve extraction of valuable metals therefrom A method of treating a mined material which includes a sulphide mineral and iron or a concentrate of the mined material to improve the recovery of a valuable metal from the sulphide mineral is disclosed. The method comprises: (i) oxidising the sulphide mi... | 11/07/2000 |
| 5453253 | Method of reprocessing jarosite-containing residues For reprocessing of jarosite-containing residues to provide usable products, the jarosite-containing residues and concentrates which contain zinc sulfide are stirred in dilute sulfuric acid, which contains 40 to 100 g/l free sulfuric acid, in an autoclave... | 09/26/1995 |
| 5234669 | Recovery of non-ferrous metals from smelter flue dusts and sludges Methods are disclosed for treating smelter flue dust and other smelter by-products so as to recover non-ferrous metals therefrom and convert arsenic and sulfur in the flue dust into non-leachable compounds. The methods allow the flue dust and other smelte... | 08/10/1993 |
| 4889694 | Recovery of zinc values from zinc and iron-bearing sulfide materials Iron-containing zinc sulfide concentrate is processed to recover zinc values therefrom. The concentrate is roasted to convert zinc sulfide and iron sulfide to their oxides while adequate sulfide-sulfur is retained to maintain the iron values in the ferrou... | 12/26/1989 |
| 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 silver values. The process includes leaching zinc-containing ... | 05/23/1989 |
| 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 availability to the sulphide retention requirements in the calcin... | 12/06/1988 |
| 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 eliminate in a controlled manner sulfur-sulfur-sulfide in the ore ... | 10/18/1988 |
| 4681746 | Method of regulating the amount of reducing agent added during catalytic reduction of NOx contained in flue gases A method of regulating the amount of reducing agent added, especially NH3 in the case of the catalytic reduction of NOx of flue gases which originate from a combustion installation which is fired with fossil fuels. The adjustment val... | 07/21/1987 |
| 4497778 | Microbial leaching of sulphide-containing ores A process of extracting metals from a material containing at least 10% by weight of pyrite and selected from the group consisting of ores containing sulphide, concentrates of such ores and mixtures of such ores and/or concentrates by microbial leaching wh... | 02/05/1985 |
| 4376647 | Process for treating sulfide-bearing ores A process for removing sulfur from sulfide-bearing ores by reacting water vapor with the sulfide-bearing ore forming hydrogen sulfide while simultaneously regenerating water vapor by reacting the hydrogen sulfide with lime. Advantageously, the process occ... | 03/15/1983 |
| 4226617 | Method for treating a mineral sulfide This invention relates to method and apparatus for treating a sulfur containing material having at least one principal sulfide either in the form of a sulfide or in a form that is transformable into a sulfide and at least one auxiliary sulfide more volati... | 10/07/1980 |
| 4192851 | Leaching of metal sulphides The process of the invention is for the separate recovery of elemental sulfur and residual sulfides and metal salt solution from reaction slurries obtained from leaching of metal sulfides in ores and concentrates. The process comprises directing flow of a... | 03/11/1980 |
