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| Number | Title | Issue Date |
| 7332000 | Method of producing gel negative electrode for alkaline battery and apparatus for producing the same In order to provide a method of producing a gel negative electrode for an alkaline battery for preparing a gel negative electrode in which a zinc powder, a gelling agent and an electrolyte are disposed uniformly, by means of an agitator comprising a cylindrical agit... | 02/19/2008 |
| 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 |
| 5770170 | Recovery of zinc from sulphidic concentrates There is provided a novel class of additives, specifically coals, which are useful in zinc extraction processes involving one or more pressure leach stages carried out at temperatures above the melting point of sulphur. Such processes may include those in... | 06/23/1998 |
| 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 |
| 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 |
| 4610721 | Two-stage leaching process for steel plant dusts A process is provided for selectively recovering zinc from steel plant dust containing substantial amounts of iron. The process comprises atmospherically leaching the steel plant dust in a first stage wherein an amount of steel plant dust is mixed with an... | 09/09/1986 |
| 4545963 | Process for separately recovering zinc and lead values from zinc and lead containing sulphidic ore A process for separately recovering zinc and lead values from zinc and lead containing sulphidic ore which also contains iron comprises subjecting ground ore to a first flotation step to float an initial lead concentrate containing zinc and produce zinc a... | 10/08/1985 |
| 4510028 | Process for recovering zinc from zinc ferrite material A process for recovering zinc from material containing zinc ferrite includes leaching the ferrite containing material together with zinc sulphide containing material in a leach step, with the relative amounts of ferrite material and zinc sulphide material... | 04/09/1985 |
| 4505744 | Recovery of zinc from zinc containing sulphidic material A process for recovering zinc from zinc-containing sulphidic material which also contains iron and lead includes leaching the material under oxidizing conditions at a temperature in the range of from about 130° to about 155° C. in aqueous sulphuric acid... | 03/19/1985 |
| 4477323 | Method for recovering zinc from a sulfidic zinc source A method for processing a sulfidic zinc source to recover metallic zinc wherein the source is leached with an electrolysis cell acid, the leaching product is separated into a liquor and a primary leaching residue, followed by drying and smelting of the dr... | 10/16/1984 |
| 4443253 | Recovery of zinc from zinc containing sulphidic materials A process for recovering zinc from zinc-containing sulphidic material also containing iron and from zinc oxide containing material. Zinc-containing sulphidic material is leached under oxidizing conditions at a temperature in the range of from about 130° ... | 04/17/1984 |
| 4440569 | Recovery of zinc from zinc-containing sulphidic material A process for recovering zinc from zinc containing sulphidic material which also contains iron together with lead and/or silver includes leaching the material under oxidizing conditions at a temperature in the range of from about 130° to about 170° C. i... | 04/03/1984 |
| 4330379 | Leaching of zinc containing sulphide minerals A process for treating zinc sulphide materials wherein the sub-divided material is firstly leached, under pressure 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... | 05/18/1982 |
| 4279867 | Process for the recovery of copper and zinc values from sulphidic ore A process for the recovery of copper and zinc values from copper and zinc containing sulphidic ore includes subjecting ground ore to a flotation operation. An initial copper concentrate is floated in a first flotation step, and the initial copper concentr... | 07/21/1981 |
| 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 |
| 4171250 | Method for zinc ore extraction A method and apparatus for extraction of zinc ore is disclosed. The zinc ore is mixed with a dilute acid, typically sulfuric acid, in a leaching process and is thereafter filtered through an appropriate number of stages. The filtration removes some of the... | 10/16/1979 |
| 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 |
| 4067789 | Process for manganese removal from zinc metal bearing solutions A process for the preferential removal of soluble manganous ions from a metal bearing solution, particularly a zinc sulfate solution to be subjected to electrolysis for the recovery of zinc, comprising treating said solution with an oxidant capable of oxi... | 01/10/1978 |
| 4004991 | Two-stage pressure leaching process for zinc and iron bearing mineral sulphides Direct pressure leaching of zinc and iron containing mineral sulphides in dilute H2 SO4 is carried out in a two-stage countercurrent process in which finely divided sulphides are leached in a first leaching stage with solution from t... | 01/25/1977 |
