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| Number | Title | Issue Date |
| 7862786 | Selective precipitation of metal sulfides A method for recovering zinc ions by selective zinc sulfide precipitation from an aqueous solution comprising zinc ions and metal ions of a metal that precipitates as a metal sulfide at a pH lower than a pH at which zinc ions precipitate as a zinc sulfide. ... | 01/04/2011 |
| 7198661 | Gas purification medium for removing sulfides from gaseous streams A gas purification medium for removing sulfides from a gaseous stream which includes tailings containing mixed metal oxides produced from a high pressure hydrometallurgical leaching process of a sulfidic ore for the recovery of at least one of nickel, cobalt, copper... | 04/03/2007 |
| 7118719 | Method for the hydrolytic precipitation of iron The invention relates to a method for the hydrolytic precipitation of iron as jarosite from a sulphate-containing solution in connection with zinc recovery from zinc calcine. The recovey contains neutral leach, ferrite leach, zinc electrolysis and iron precipitation... | 10/10/2006 |
| 7077963 | Processes for water treatment The invention provides compositions comprising bauxite refinery residues that have been reacted with sufficient calcium and magnesium ions that they have a reaction pH of less than 10.5, and one or more water treating additives. The invention also provides processes... | 07/18/2006 |
| 6846346 | Sulfatization process for metal extraction from sulfide ores The invention provides a hydrometallurgical process for treating metal-containing sulfide ores and concentrates, comprising reacting said metal-containing sulfide with concentrated sulfuric acid at a temperature of between about 300° C. and 400° C. in the presence... | 01/25/2005 |
| 6835228 | Process of recovering valuable metals from waste secondary batteries A process of recovering metals from waste lithium ion/Ni—H/Ni—Cd batteries, wherein the waste batteries are calcined and sieved to generate an ash containing metals and metal oxides. The process includes subjecting the ash to a first dissolution etching treatmen... | 12/28/2004 |
| 6203769 | Process for the treatment of fluoboric electrolyte The invention relates to a method for the treatment of fluoboric electrolyte resulting from the processes of electro-extraction of metals such as copper and lead comprising a leaching stage with fluoboric acid, in order to recycle said fluoboric acid to b... | 03/20/2001 |
| 5711922 | Preferential hydrometallurgical conversion of zinc sulfide to sulfate from zinc sulfide containing ores and concentrates A hydrometallurgical process for converting zinc sulfide in an ore containing zinc sulfide, said zinc sulfide being chemically converted at elevated temperatures to ZnSO4.xH.sub.2 O which crystallizes substantially in the monohydrate formas ZnS... | 01/27/1998 |
| 5650057 | Chloride assisted hydrometallurgical extraction of metal A process for the extraction of a metal from an ore or concentrate comprises subjecting the ore or concentrate to pressure oxidation in the presence of oxygen and an acidic solution containing halogen ions and a source of bisulphate or sulphate ions, such... | 07/22/1997 |
| 5484579 | Hydrometallurical recovery of copper and zinc from complex sulfide ores A continuous hydrometallurgical process for conversion of ore derived copper and zinc sulfides into recoverable water soluble sulfates is provided. The process comprises: i) contacting the ore derived copper and zinc sulfides with sulfuric acid and with n... | 01/16/1996 |
| 5433855 | Process for extracting metal values from aqueous solution A process for extracting metal values especially zinc values from aqueous solutions of metal salts which comprises contacting the aqueous solution with an organic phase comprising a compound of the formula: ##STR1## wherein each of R1, R | 07/18/1995 |
| 5393431 | Process for extracting metals A process for extracting metal values especially zinc values from aqueous solutions of metal salts which comprises contacting the aqueous solution with an organic phase comprising a compound of the formula: ##STR1## wherein each of R1, R | 02/28/1995 |
| 5348713 | Recovery of metal values from zinc plant residues A process is disclosed for recovering zinc, lead, copper and precious metals from zinc plant residue, said process comprising leaching the residue with return zinc spent electrolyte, neutralizing residual acid and reducing ferric iron in the solution by a... | 09/20/1994 |
| 5332560 | Process for the removal of zinc and nickel from copper ammine sulfate solutions A method for the recovery of copper from copper-containing materials, for example, scrap, ores or dust. An aqueous cupric tetrammine sulfate lixiviant is contacted with the copper-containing material to produce a leachate containing cuprous, nickel, and z... | 07/26/1994 |
| 5316751 | Methods for mine tailing clean-up using recovery technologies A method for site remediation for mitigating contamination from metals or metal compounds, particularly resulting from the situation of mine tailing waste on or near water sources, including the reprocessing and redeposit of separated sands and slimes in-... | 05/31/1994 |
| 5286465 | Hydrometallurgical process for recovering iron sulfate and zinc sulfate from baghouse dust A process for recovering zinc/rich and iron-rich fractions from the baghouse dust that is generated in various metallurgical operations, especially in steel-making and other iron-making plants, comprises the steps of leaching the dust by hot concentrated ... | 02/15/1994 |
| 5200042 | Process to recover pure copper during purification of zinc sulfate solution A process for recovery of copper from a copper residue obtained during purification of a zinc sulfate solution comprises leaching the copper residue in a concentrated sulfuric acid solution in the presence of an oxidant at a temperature of between 60° an... | 04/06/1993 |
| 5178771 | Method for measuring impurity concentration and removing impurities from electrolytic solution for electrowinning of zinc Concentrations of cobalt and copper of electrolysis solution for electrowinning of zinc can be measured any time during electrowinning operation by continuously sampling the solution, diluting it, adding coloring reagent to the flow of the solution and sp... | 01/12/1993 |
| 5135652 | Method for the solvent extraction of zinc Zinc is selectively extracted from zinc sulfate solutions that may also contain sulfuric acid and amounts of other metals with an organic extractant mixture containing both organic substituted phosphoric acid and organic substituted thiophosphinic acid. T... | 08/04/1992 |
| 5128047 | Sequential separation of metals by controlled pH precipitation A process for separately removing zinc and iron from acidic wastewater. The process involves adding alkali metal hydroxide to the acidic wastewater (below about pH 4) to achieve a first pH of about 4.8 to at most about 5.4 and precipitate an iron hydroxid... | 07/07/1992 |
| 5082638 | Process of recovering non-ferrous metal values, especially nickel, cobalt, copper and zinc, by using melt and melt coating sulphation, from raw materials containing said metals The invention relates to a process for recovering non-ferrous metal values such as nickel, cobalt, copper, zinc, manganese and magnesium from material containing said metals, by converting the non-ferrous metal values into sulphates by using melt and melt... | 01/21/1992 |
| 5017346 | Process for treating zinc oxide bearing materials A process of refining zinc oxide from roasted zinc sulphide bearing concentrates comprises leaching the concentrate in an aqueous sulphur dioxide solution under controlled conditions providing selective separation of zinc from other elements contained in ... | 05/21/1991 |
| 4715939 | Method for removal of monovalent ions from ZnSO4 electrolyte by electrodialysis Monovalent ions, especially chloride and fluoride, but also thallium, sodium and potassium are efficiently removed from ZnSO4 electrolyte by electrodialysis. Monovalent anions are removed using alternating monovalent anion permselective membran... | 12/29/1987 |
| 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 |
| 4637832 | Process for purifying solutions of zinc sulphate A process for purifying aqueous solutions of zinc sulphate removed from leaching processes and containing metals such as Cu, Cd, Ti, Ni, Co, Ge, As, Sb which consists in cementing said metals with zinc dust and with a couple of activators chosen between C... | 01/20/1987 |
| 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 |
| 4594102 | Recovery of cobalt and nickel from sulphidic material A process for recovering cobalt and nickel values from cobalt and nickel containing sulphidic material also containing iron includes roasting the sulphidic material to produce a calcine containing water soluble cobalt and nickel sulphate, and leaching the... | 06/10/1986 |
| 4579726 | Process and apparatus for the removal of mercury from sulfur dioxide-bearing hot and moist gases Mercury is removed from sulfuric acid-bearing hot and moist smelting-plant or roasting-plant gases by cooling and scrubbing the hot gases by means of a concentrated sulfuric acid mist in order to sulfatize the mercury and to separate it from the gases. Th... | 04/01/1986 |
| 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 |
| 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 |
| 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 |
| 4441993 | Flotation process A process for recovering metallic values by putting the values into solution and separating undesired mineral matter from the solution using countercurrent flotation is provided. The process involves leaching metallic values from host rock, conditioning t... | 04/10/1984 |
| 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 |
| 4401531 | Process for the production of electrolytic zinc or high purity zinc salts from secondary zinc raw-materials The present invention relates to a process for the production of either electrolytic zinc or high purity zinc salts from secondary zinc raw materials which comprises: leaching said raw material in a slightly acid aqueous solution at controlled pH, separat... | 08/30/1983 |
| 4383979 | Process for the recovery of zinc, copper and cadmium in the leaching of zinc calcine Zinc, copper and cadmium are recovered from their ferrites by subjecting the ferrites to a sulfuric acid bearing solution in the presence of potassium, sodium or ammonium ions under atmospheric conditions at 80°-105° C. to precipitate the iron present i... | 05/17/1983 |
| 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 |
| 4305914 | Process for precipitating iron as jarosite with a low non-ferrous metal content A process for precipitating iron as a jarosite from a sulphate solution containing ferric iron, free acid and valuable non-ferrous metals, characterized by cooling the solution; partially neutralizing the free acidity, and then clarifying the solution; he... | 12/15/1981 |
| 4256485 | Enzyme oxidation of sulfides in minerals A process for treating sulfide ores to reduce the sulfur content or recover the metal content therefrom comprises the use of enzymatic action to solubilize the sulfur and metal content. A nutrient, such as a saccharide, is used along with yeast spores which ... | 03/17/1981 |
| 4192852 | Process for precipitating iron as jarosite with a low non-ferrous metal content A process for precipitating iron as a jarosite from a sulphate solution containing ferric iron, free acid and valuable non-ferrous metals, characterized by cooling the solution; partially neutralizing the free acidity, and then clarifying the solution; he... | 03/11/1980 |
