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| Number | Title | Issue Date |
| 7799296 | Method of producing a nickel salt solution A method for converting nickel into a nickel salt solution. Nickel is dissolved and reacted in an oxygen-enriched acidic solution to produce a nickel salt solution as illustrated in the following chemical equation, wherein X is a conjugate base: Ni+H2... | 09/21/2010 |
| 7387770 | Method for ferric sulfate manufacturing A process is provided for the production of liquid ferric sulfate from finely-divided ferric oxide, sulfuric acid and water in a reaction system comprising at least one closed reaction vessel at temperatures ranging from about 120° C. to about 150° C. and pressure... | 06/17/2008 |
| 7364717 | Process for converting nickel to nickel sulfate A preferred embodiment of the present invention provides a process for making nickel sulfate by converting nickel metal into nickel sulfate, which may be converted to nickel hydroxide. Nickel metal is dissolved in sulfuric acid and oxygen containing gas is introduce... | 04/29/2008 |
| 7351391 | System and method for converting the spent remnants of a first pickling acid solution into a usable second pickling acid solution A system and method of economically converting a spent first pickling acid solution that contains hydrochloric acid, water and ferrous chloride into a suitable second pickling solution. Sulfuric acid is added to the first pickling acid solution. This produces a rege... | 04/01/2008 |
| 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 |
| 7097816 | Method of producing ferrous sulfate heptahydrate In a method of producing ferrous sulfate heptahydrate, ferrous sulfate monohydrate is converted in a crystallization reactor in the presence of water into ferrous sulfate heptahydrate as crystallized product, and water is subsequently isolated from the ferrous sulfa... | 08/29/2006 |
| 7067100 | Liquid ferric sulfate manufacturing process A process for the production of liquid ferric sulfate from finely-divided ferric oxide, sulfuric acid and water in a closed reaction vessel at temperatures ranging from about 130.degree. C. to about 150.degree. C. and pressures from about 30 psi to about 70 psi. The... | 06/27/2006 |
| 6852297 | Method of treating residual acid A method of treating residual acid from production of chlorine dioxide is described. The method is characterized in that a compound containing iron is added to the residual acid to react therewith and form a product, which contains iron in trivalent form. As iron co... | 02/08/2005 |
| 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 |
| 6379637 | Direct atmospheric leaching of highly-serpentinized saprolitic nickel laterite ores with sulphuric acid The present invention provides an atmospheric acid leaching process for leaching nickel and cobalt from highly-serpentinized saprolitic fractions of nickel laterite deposits that are generally too low in nickel to support economical extraction of their ni... | 04/30/2002 |
| 6375919 | Method for the manufacture of ferric sulfate solution and a water treatment agent using the same A method for the manufacture of a ferric sulfate solution is provided, characterized in that, iron ore containing 30% by weight or more FeOOH as a trivalent iron (Fe3+) is calcined at 200-600° C., and then dissolved in sulfuric acid. A water t... | 04/23/2002 |
| 6340450 | Method for leaching zinc concentrate in atmospheric conditions The invention relates to a method for leaching zinc concentrate in atmospheric conditions in the presence of trivalent iron. It is essential that the zinc concentrate is fed into conditions where in addition to trivalent iron, there are also jarosite nucl... | 01/22/2002 |
| 6274104 | Non-ferrous metal recovery method utilizing a melt sulphation reaction The invention relates to a method for recovering non-ferrous metals, particularly nickel, cobalt, copper, zinc, manganese and magnesium, from materials containing said metals by converting said non-ferrous metals into sulphates by means of melt and melt c... | 08/14/2001 |
| 6245240 | Treatment of a solution containing iron salts Provided herein is a process for treatment of solutions which contain ferrous, ferric and soluble manganese species which process comprises addition of an oxidizing agent to such a solution to cause formation of manganese dioxide particles and adding mang... | 06/12/2001 |
| 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 |
| 6110433 | Process for the recovery of metals from used nickel/metal/rare earth hydride storage batteries The invention relates to a process for recovering metals from used nickel/hydride storage batteries, in which storage battery scrap has been mechanically comminuted and divided into at least a coarse fraction and a fine fraction capable of being treated s... | 08/29/2000 |
| 6053963 | Method for treating rotary slag The present invention provides a method for treating rotary slag containing iron and sodium compounds. The method involves treating the slag in a sulfuric acid solution to convert the iron and sodium within the slag to iron sulfate and sodium sulfate. The... | 04/25/2000 |
| 6039790 | Method for recovering nickel hydrometallurgically from two different nickel mattes The invention relates to a method for recovering nickel in one and the same process from two pyrometallurgically produced nickel mattes, one of which contains a remarkable percentage or iron. The leaching of iron-bearing nickel matte is carried out in one... | 03/21/2000 |
| 5766566 | Process for preparing ferric sulfate The invention relates to a process of preparing ferric sulfate by forming a slurry which contains ferrous sulfate and sulfuric acid, the slurry containing bivalent iron in both the solution phase and the solid phase, and by oxidizing this slurry to form a... | 06/16/1998 |
| 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 |
| 5599458 | Method to prevent the exhaustion of acid copper plating baths and to recover metallic copper from solutions and sludges containing copper in an ionic form Method to prevent the exhaustion of acid copper plating baths (12) and to treat sewage or sludges (20) containing copper in an ionic form so as to recover metallic copper (39), the method including the addition (11) of a compound which keeps the concentra... | 02/04/1997 |
| 5498398 | Method of treating spent electrolytic solution from electrolytic copper production Disclosed herein is a method for treating a spent copper-refining electrolyte to remove impurities such as copper (Cu), arsenic (As), antimony (Sb), bismuth (Bi), nickel (Ni) and the like by using a hydrogen sulfide gas. The method comprises the steps of:... | 03/12/1996 |
| 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 |
| 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 |
| 5178842 | Method for precipitating and separating metals According to the method of the invention, at least one or several of the metals nickel, cobalt and copper can be selectively precipitated as sulphide by aid of elemental sulphur from aqueous solutions containing other metals such as zinc. The temperature ... | 01/12/1993 |
| 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 |
| 4956154 | Selective removal of chromium, nickel, cobalt, copper and lead cations from aqueous effluent solutions Aqueous effluent solutions containing metal cations may be treated with an extractant comprising an organophosphinic acid, a di-2-ethylhexyl phosphoric acid and/or an aliphatic amine to selectively separate chromium, nickel, cobalt, copper and lead cation... | 09/11/1990 |
| 4954322 | Process for the recovery of metal values contained in a gangue The invention relates to a process for the recovery of metal values contained in a ferric gangue. The process comprises the following stages: (a) dissolution of the metal values from the ferric gangue with sulphuric acid; (b) recovery of the metal value or val... | 09/04/1990 |
| 4943418 | Method of preparing high-purity manganese compounds In a method of preparing high-purity manganese compounds, wherein the method comprises adding a member selected from ferromanganese and metallic manganeses to an aqueous electrolyte-containing solution, dissolving said member while stirring and maintainin... | 07/24/1990 |
| 4891206 | Process for the removal of undesirable metal ions, especially vanadium ions, in the concentration of dilute iron(II) sulfate-containing sulfuric acid solutions A process for the extensive removal of undesirable metal ions, particularly vanadium ions, in the course of the concentration of dilute iron(II) sulfate-containing sulfuric acid solutions. The sulfuric acid solutions are concentrated by the evaporation of... | 01/02/1990 |
| 4872909 | Process for acid leaching of manganese oxide ores aided by hydrogen peroxide A method of processing manganese ore by adding the ore to an aqueous solution of acid and H2 O2 to form a leach pulp. The leach pulp is agitated for a predetermined time period at predetermined temperatures. The leach pulp is then se... | 10/10/1989 |
| 4861371 | Nickel-containing leachate having low aluminum content A nickel-containing ore is leached with sulfuric acid to dissolve nickel and associated metallic values into the sulfuric acid to form a leachate, the sulfuric acid further containing a source of the monovalent cations sodium, potassium or ammonium to sup... | 08/29/1989 |
| 4816236 | Recovery of vanadium and nickel from petroleum residues A process is provided for the recovery of vanadium and nickel values from petroleum residues and, in particular, from Flexicoke. In the process, Flexicoke is blended with an alkali metal source, such as sodium sulfate or sodium carbonate, and then roasted... | 03/28/1989 |
| 4814158 | Process for making liquid ferric sulfate A process for the production of liquid ferric sulfate from finely-divided ferric oxide, sulfuric acid and water in a closed reaction vessel at temperatures ranging from about 130° C. to about 150° C. and pressures from about 30 psi to about 40 psi. The ... | 03/21/1989 |
| 4707349 | Process of preparing a preferred ferric sulfate solution, and product A process is provided for preparing a preferred ferric sulfate solution. The product of the process is particularly suited for use in water treatment and purification. According to the process, iron oxides or iron, are dissolved in sulfuric acid to form f... | 11/17/1987 |
| 4707348 | Method for neutralizing waste sulfuric acid by adding a silicate It has been shown that magnesiumsilicates, particularly Mg-rich olivine, is very advantageous for neutralizing waste sulfuric acid. A silicagel and a Fe/Mg-containing liquid are formed. The experiments show that a distinct separation of the silicagel from... | 11/17/1987 |
| 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 |
| 4657745 | Value recovery from spent alumina-base catalyst A process for the recovery of aluminum and at least one other metal selected from the group consisting of molybdenum, nickel and cobalt from a spent hydrogenation catalyst comprising (1) adding about 1 to 3 parts H2 SO4 to each part ... | 04/14/1987 |
