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| Number | Title | Issue Date |
| 7329396 | Process for the recovery of value metals from material containing base metal oxides A process for leaching a value metal from oxidic materials, such as a lateritic nickel ore, comprising the step of leaching the ore with a lixiviant comprising a cationic salt (e.g., magnesium chloride) and hydrochloric acid is disclosed. An oxidant or additional me... | 02/12/2008 |
| 7037482 | Solvent extraction of a halide from a aqueous sulphate solution A method of extracting a halide and sulphate from an aqueous sulphate solution, such as a zinc sulphate solution, comprises subjecting the solution to solvent extraction to extract halide and sulphate from the solution and controlling the amount of sulphate extracte... | 05/02/2006 |
| 6921474 | Chloride melt process for the separation and recovery of zinc Process for the production of ZnCl2 from a Zn bearing primary and/or secondary material comprising the steps of reacting the Zn bearing material with a chlorinating agent such as Cl2 to convert metals into chlorides and vaporising the volatile ... | 07/26/2005 |
| 6863873 | Process to produce simonkolleite, zinc oxide and zinc hydroxide A hydrometallurgical process utilizing an atmospheric calcium chloride leach to selectively recover from various metal feed stocks (consisting of elemental metals, metal oxides, metal ferrite, metal hydroxide, metal carbonates, metal sulfate/sulfur compounds, and th... | 03/08/2005 |
| 6524546 | Process for making calcium chlorides A new process for producing calcium chloride and other metal halides from the carbonates, bicarbonates, oxides of these metals. The process utilizes the discovery that hydrogen halides, when used in a true or conventional fluidizing medium in shallow beds... | 02/25/2003 |
| 6447740 | Mercury removal from flue gas The invention is directed to a process for oxidizing gaseous pollutants in a flue gas stream composed of flue gases, water vapour and one or more gaseous pollutants selected from the group consisting of SO2, NO, NO2, H2 S,... | 09/10/2002 |
| 6117408 | Method of producing zinc bromide A method for producing zinc bromide from zinc hydroxide contaminated with iron and manganese compounds. The method comprises the step of mixing zinc hydroxide feedstock containing metal impurities with a hydrobromic acid comprising elemental bromine in th... | 09/12/2000 |
| 6036929 | Process for the recovery of zinc from aqueous process streams The invention provides a process for the removal and recovery of zinc from an aqueous process stream. In particular, the process of the invention is useful in the removal and recovery of zinc compounds such as zinc chloride from an aqueous effluent stream... | 03/14/2000 |
| 5619937 | Sorbent melts for capture of metals from combustion gases A cloud or dispersion of a particulate flux is formed in a combustion zone for the purpose of capturing metallic vapor from the combustion gas by formation of a eutectic of the metal and the flux, as a melt on at least the surfaces of the dispersed flux p... | 04/15/1997 |
| 5226545 | Extraction of mercury and mercury compounds from contaminated material and solutions Mercury and mercury-containing compounds can be removed from soil, sand, and similar materials by a remediation method in which the contaminated material is treated with an aqueous composition comprising an oxidant, such as iodine, and a complexing or sol... | 07/13/1993 |
| 5208004 | Method for the recovery of zinc oxide A method for the recovery of zinc oxide from industrial waste materials of various components, including zinc, lead, iron and cadmium, comprising the steps of treating the waste material with an ammonium chloride solution maintained at an elevated tempera... | 05/04/1993 |
| 5074910 | Process for recovering precious metals from sulfide ores The present invention is a process to recover precious metals from sulfide ores. It involves chlorinating a mixture of an ore concentrate and salt to form a liquid melt. The salt preferably contains potassium chloride. This chlorination is carried out at ... | 12/24/1991 |
| 5013358 | Method for the recovery of mercury from mercury-containing material Insoluble mercury salts and any mercury in mercury-containing material are converted into a soluble form by controlled chlorination. The soluble forms of mercury in the chlorination solution are reduced with iron, preferably iron powder, to elemental merc... | 05/07/1991 |
| 4671945 | Method for separation and leaching of the valuable metals in sulphide materials This is a method for the complete leaching of the valuable metals in a metal sulphide material which contains copper, zinc, lead, silver and iron by the use of a solution which essentially contains cupric chloride/sulphates. After the valuable metals have... | 06/09/1987 |
| 4662938 | Recovery of silver and gold This invention provides processes for selectively recovering silver and gold values from feed materials containing both precious metals, and comprises leaching the feed material with a hot ferric chloride-acid brine leach solution for a time sufficient to... | 05/05/1987 |
| 4634507 | Process for the production of lead from sulphide ores The process for production of lead from lead sulphide ores involves leaching the ores with a ferric chloride solution, at a temperature from about 70° C. to 105° C., at a pH of from about 4.0 to 0.5, recovering the lead by cementation with metallic zinc... | 01/06/1987 |
| 4620492 | Process for purifying flue gas A process for the purification of flue gas generated during the combustion of waste materials has a first embodiment wherein soluble heavy metals are precipitated and recovered in a compact form and wherein the soluble heavy metal-free extraction residue ... | 11/04/1986 |
| 4610722 | Process for metal recovery from steel plant dust A process is provided for hydrometallurgical processing of steel plant dusts containing cadmium, lead, zinc, and iron values, along with impurities such as chloride and fluoride salts of sodium, potassium, magnesium, etc. The first step in the process inv... | 09/09/1986 |
| 4591489 | Process for the treatment of hydrochloric acid pickles containing iron and zinc A process for the treatment of a spent hydrochloric acid solution containing dissolved iron, zinc, and minor amounts of heavy metals to remove such dissolved metals from the solution, which process comprises contacting said solution with metallic iron in ... | 05/27/1986 |
| 4568525 | Method for the selective dissolution of lead from mixed minerals containing zinc The invention is concerned with a method for the selective dissolution of lead in relation to zinc that is present as a sulphurized compound. The method comprises treating said compound to lixiviation with a solution containing ferrous chloride, while bubbling... | 02/04/1986 |
| 4457812 | Critical solvent separations in inorganic systems A process for separating inorganic substances involving their abstraction from a mixture with near-supercritical inorganic fluids. One or more inorganic substances are abstracted and then separatively recovered by retrograde condensations. The process par... | 07/03/1984 |
| 4412936 | Pigment for color-changing heat indicator A pigment for a color-changing heat indicator comprising a product obtained by interaction of an aqueous solution containing ions of copper and mercury with an aqueous solution of a nitrogen-containing organic compound: an amide of carbonic acid, an amide... | 11/01/1983 |
| 4355009 | Separative treatment of zinc-bearing flue dust A hydrometallurgical process is provided for separative treatment of zinc-bearing metallurgical flue dust containing significant amounts of lead, chlorine, and iron. The process is especially suited for extraction of zinc sulfate from blast furnace white ... | 10/19/1982 |
| 4230487 | Method of selectively bringing into solution the non-ferrous metals contained in sulphurized ores and concentrates The invention provides a method for selectively solubilizing the non-ferrous metals contained in sulphurized ores and concentrates, with regard to the iron and sulphur therein, by subjecting the ore or concentrate to lixiviation with an aqueous solution o... | 10/28/1980 |
| 4124459 | Process for removing mercury from brine sludges The mercury content of electrolysis cell brine sludge is reduced by sequentially: (1) acidifying the sludge to a pH below 2.5 and (2) leaching the sludge with aqueous hypochlorite solvent. The mercury content removed from the sludge may optionally be isol... | 11/07/1978 |
| 4011146 | Process for separation and recovery of metal values from sulfide ore concentrates An improvement in conventional processes for recovering metal values from sulfide ores containing lead, zinc and silver sulfides in which process the metal sulfides are converted to chlorides by chlorination followed by solubilization of the chlorides wit... | 03/08/1977 |
| 4005174 | Process for the elimination of chloride from zinc sulphate solutions A process for removing chlorine from a solution of zinc sulfate, in which the pH of the solution is reduced to below 2.6 with sulfuric acid. Cupric ions are established in the solution in an amount such that after removal of the chlorine by precipitation ... | 01/25/1977 |
| 3981967 | Process for the recovery of bound mercury from mercury-containing catalysts An improved process for the recovery of mercury from exhausted mercury-containing catalyst by heating the inactive catalyst at 270°-600°C. while passing a carrier gas therethrough, which comprises pretreating the exhausted catalyst with chlorine.... | 09/21/1976 |
