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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 |
| 6953120 | Method of recovering metal and/or oxide thereof in a slurry and tailings obtained from said method A method of recovering metal and/or oxide thereof from a slurry is described. The method involves magnetically separating at least a portion of any magnetic impurities from the slurry and then leaching or dissolving at least a portion of any remaining magnetic impur... | 10/11/2005 |
| 6206951 | Method for leaching nickel from nickel matte The invention relates to a method for leaching sulfidic nickel matte and particularly copper rich nickel matte, as well as for leaching said matte together with a metallic copper and/or copper-nickel matte. The leach of nickel matte is carried out as pres... | 03/27/2001 |
| 5734020 | Production and use of magnetic porous inorganic materials Magnetic porous inorganic siliceous materials having a particle size of about 1 to about 200 microns useful as solid supports in various chromatography, immunoassays, synthesis and other separation and purification procedures is disclosed.... | 03/31/1998 |
| 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 |
| 5344479 | Upgrading copper sulphide residues containing nickel and arsenic A process is disclosed for separating and recovering nickel and copper values from a nickel-copper matte which may contain iron and arsenic. Finely divided nickel-copper matte is leached in aqueous sulphuric acid solution under oxidizing conditions at atm... | 09/06/1994 |
| 4732827 | Process for producing electrolyte for redox cell A process for producing an anolyte and a catholyte for redox cells which comprises the steps of heating chromium ore together with carbonaceous substances to produce a pre-reduced chromium product produced a part of iron and chromium in chromium ore, diss... | 03/22/1988 |
| 4698139 | Hydrometallurgical method for treating valuable metal raw materials containing chlorides and fluorides The purpose of the method is to remove chlorides and fluorides from a valuable metal raw material by leaching the raw material into sulphuric acid solution and by crystallizing the valuable metal sulphate selectively out of the solution. The valuable meta... | 10/06/1987 |
| 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 |
| 4624703 | Recovery of tungsten, scandium, iron, and manganese values from tungsten bearing material A process is disclosed for recovering tungsten, scandium, iron, and manganese from tungsten bearing material. The process involves digesting the material in sufficient sulfuric acid at a sufficient temperature for a sufficient time in the presence of a re... | 11/25/1986 |
| 4585477 | Method for separating and recovering nickel and copper from complex materials A method of recovering copper and nickel from sulphidic minerals containing copper, nickel and iron comprises the steps of roasting the mineral, preferably to provide magnetite; sulphating, for example with sulphuric acid, sulphur trioxide, metal sulphate... | 04/29/1986 |
| 4567026 | Method for extraction of iron aluminum and titanium from coal ash A method is disclosed for the recovery of iron, aluminum and titanium from coal ash. The method comprises magnetically extracting magnetite from the ash, leaching the ash with a solution of a mineral acid, precipitating and removing titanium and iron hydr... | 01/28/1986 |
| 4541993 | Process for the sulfatization of non-ferrous metal sulfides In the extraction of certain non-ferrous metals from their sulfide ores by a process where these sulfides are converted to water soluble sulfates by roasting, alkali metal carbonate or bicarbonate, especially sodium carbonate, is added to the roaster feed... | 09/17/1985 |
| 4476235 | Green molded product containing asbestos tailings suitable for firing There is disclosed a green moulded product suitable for preparing shaped fired units comprising (a) at least 55% to 99% by weight of non-calcined asbestos tailings, the remainder comprising (b) at least one of (i) a heat decomposable metal salt selected f... | 10/09/1984 |
| 4386057 | Recovery of iron oxide from coal fly ash A high quality iron oxide concentrate, suitable as a feed for blast and electric reduction furnaces is recovered from pulverized coal fly ash. The magnetic portion of the fly ash is separated and treated with a hot strong alkali solution which dissolves m... | 05/31/1983 |
| 4317803 | Recovery of non-ferrous metals by thermal treatments of solutions containing non-ferrous and iron sulphates The specification discloses a method for recovering non-ferrous metals such as zinc or copper from their concentrates, ores or any other metal containing materials into a solution containing these non-ferrous metals as sulphates and a minimal amount of di... | 03/02/1982 |
| 4298580 | Separation of cobalt and manganese from trimellitic acid process residue by precipitating as carbonates, redissolving as halides and removing cobalt by magnetic means Recovery of cobalt and manganese from residue of trimellitic acid manufacture and recovery as 4-carboxy-phthalic anhydride by extracting the residue with an aqueous alkaline solution containing carbonate ions which leaves a precipitate of metal carbonates... | 11/03/1981 |
| 4296080 | Process for the removal of particulates entrained in a fluid using a magnetically stabilized fluidized bed A fluidized bed process is disclosed which comprises subjecting a bed comprised of solid particulate magnetizable, fluidizable material within an external force field wherein at least a portion of the bed containing said solid particulate magnetizable and... | 10/20/1981 |
| 4287167 | Novel harzburgite and preparation thereof There is provided a novel harzburgite of the formula Pyx Ol.sub.(1-x) where x is a decimal number of from 0.001 to 0.4, Py is an abbreviation for pyroxene, and Ol is an abbreviation for olivine having a total iron oxide content of less than 5% ... | 09/01/1981 |
| 4260588 | Production of sulphidic copper concentrates A process for the production of a sulphidic copper concentrate from a complex sulphidic concentrate containing as its main constituents copper, iron and at least one non-ferrous metal selected from the group consisting of zinc, lead, nickel and cobalt, co... | 04/07/1981 |
| 4173520 | Hydrometallurgical method for treating nickel mattes This invention provides a process for treating a nickel matte to recover essentially pure nickel comprising: treating an aqueous mixture of the matte with chlorine to produce a solid residue and an aqueous lixiviating solution having a pH value which is s... | 11/06/1979 |
| 4148632 | Treatment of dissolved basic nickel carbonate to obtain nickel A process for recovering nickel from an impure nickel compound which contains a major proportion of nickel values and a minor proportion of other metal values which are relatively soluble in ammoniacal ammonium sulphate solution, and a minor proportion of... | 04/10/1979 |
| 4100043 | Atmospheric leach ion-exchange process for treating iron-containing nickel-copper matte A method is provided for leaching comminuted nickeliferous sulfide matte containing by weight about 20 to 75% nickel, about 5 to 50% copper, non-stoichiometric sulfur in the range of over 4 to about 24%, over 0.5 to about 20% iron, the sum of the nickel, ... | 07/11/1978 |
| 4083915 | Cobalt stripping process After the non-cobalt values are stripped from the co-loaded organic, the cobalt ions on the organic are reduced to the divalent state. The organic loaded with divalent cobalt ions is easily stripped with a dilute acid to render the organic recyclable. In ... | 04/11/1978 |
| 4067952 | Leaching of copper-nickel concentrates A process for the treatment of nickel-copper concentrates comprises the steps of leaching nickel selectively with a dilute hydrochloric acid solution, separating the leach solution from the residue, roasting the residue at a temperature sufficient to form... | 01/10/1978 |
| 4054638 | Process for treating residues from the electrolytic processing of zinc, by recovery of the metals therein A process for the re-utilization of the sulphate residues from the electrolytic treatment of zinc. The residues are digested hot with concentrated HCl in the presence of CaCl2. PbCl2 crystallizes on cooling. FeCl3 is extracted ... | 10/18/1977 |
| 4042474 | Separating nickel, cobalt and chromium from iron in metallurgical products A finely divided product containing Ni and Fe is dissolved in a sulfate-containing solvent in at least two stages and in the presence of an alkali metal and an oxidant for preciptating the Fe as alkali jarosite while Ni remains in solution which is subjec... | 08/16/1977 |
| 4029733 | Extraction of metals from sea nodules The method comprises the steps of crushing of the ore, neutralization by a mixture of water and sulphuric acid, introduction of a controlled quantity of sulphur dioxide gas at a pH value between 1.5 and 4 for promoting dissolution of nickel, copper and a ... | 06/14/1977 |
| 4016055 | Method of extracting constituent metal values from polymetallic nodules from the sea A method of extracting constituent metal values from sea nodules containing copper, cobalt, iron and nickel is disclosed. The method involves melting the nodules under reducing conditions to obtain a concentrate containing said metals and reacting the met... | 04/05/1977 |
| 4008134 | Extraction and separation of metals from solids using liquid cation exchangers Process for extraction and separation of metals utilizing the advantages of liquid-liquid extraction with cation exchangers without requiring the equivalent addition of alkali. The process is based on a combination of leaching the metal-containing raw mat... | 02/15/1977 |
| 4002717 | Refining of manganese oxide ores This invention provides a method for treating manganese oxide ores in an aqueous medium, with hydrogen halide or sulfuric acid, and a hydrogen sulfide or a metal sulfide, e.g. an ore. A leach liquor containing the desirable metal halides is then separated... | 01/11/1977 |
| 3959097 | Selenium rejection during acid leaching of matte A method is provided for removing trace amounts of selenium from acid leach solutions containing over 2 ppm of total selenium comprising either Se(IV) and/or Se(VI) obtained during the pressure oxidation leaching of metal sulfide concentrate comprising fo... | 05/25/1976 |
| 3933975 | Nickel-cobalt separation A method is provided for separating nickel and cobalt from a cobalt-nickel precipitate, the cobalt being in the cobaltic state. The method comprises dissolving the precipitate in an ammonium sulfate solution containing NH3, acidifying the solut... | 01/20/1976 |
