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| Number | Title | Issue Date |
| 7410631 | Metal phosphate sols, metal nanoparticles, metal-chalcogenide nanoparticles, and nanocomposites made therefrom Disclosed are metal phosphate sols made by mixing at least one metal oxide, at least one phosphate precursor, at least one organosilane, and a liquid. Also disclosed are nanocomposites containing the metal phosphate sols and at least one of metal nanoparticle and me... | 08/12/2008 |
| 7294319 | Method for precipitating iron from a zinc sulphate solution as hematite This invention relates to a method for the removal of iron as hematite from a zinc sulphate solution in atmospheric conditions during the electrolytic preparation of zinc. According to the method, the pH of the iron-containing solution is adjusted to a value of at l... | 11/13/2007 |
| 6998056 | Process and device for aerating a liquid with gas Apparatus and process for aerating a liquid with gas, the apparatus comprising a pressure vessel including a lower section containing the liquid and an upper section containing a volume of the gas. A pressure connection in the upper section of the pressure vessel ad... | 02/14/2006 |
| 6838004 | Nanopore reactive adsorbents for the high-efficiency removal of waste species A nanoporous reactive adsorbent incorporates a relatively small number of relatively larger reactant, e.g., metal, enzyme, etc., particles (10) forming a discontinuous or continuous phase interspersed among and surrounded by a continuous phase of smaller adso... | 01/04/2005 |
| 6710091 | Nanoparticulate, redispersible zinc oxide gels A method for the preparation of nano size zinc oxide particles having an average primary particle diameter of less than or equal to 15 nm, which are redispersible in organic solvents and/or water, by basic hydrolysis of at least one zinc compound in alcohol or an al... | 03/23/2004 |
| 6645458 | Method for making an aqueous sodium chloride solution Process for the manufacture of an aqueous sodium chloride solution, according to which a solid material comprising sodium chloride and heavy metals is dispersed in water, the aqueous medium thus obtained is alkalinized so as to precipitate the heavy metal... | 11/11/2003 |
| 6395242 | Production of zinc oxide from complex sulfide concentrates using chloride processing The present invention relates to an apparatus and a process for producing zinc oxide from a zinc-bearing material. The process according to the present invention comprises the steps of leaching the complex sulfide material with hydrochloric acid and oxyge... | 05/28/2002 |
| 6342189 | Method for total precipitation of valuable metals from an acid leaching solution A method for the total precipitation of valuable metals, such as copper, nickel, zinc, cobalt, etc., from a leaching solution that has been acidified with sulphuric acid and that is substantially free from impurities, by neutralizing the solution with lim... | 01/29/2002 |
| 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 |
| 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 |
| 5980856 | Synthetic chalcoalumite-type compounds and processes for producing the same This invention relates to synthetic chalcoalumite-type compounds represented by formula (1) below: M2+a-x/2 Lix1+ Al43+ (OH)b (An-)c.mH.sub.2 O ... | 11/09/1999 |
| 5908608 | Synthesis of metal chalcogenide quantum An aqueous system for the production of metal chalcogenide nanocrystalline salts such as zinc selenide, from a hydrolyzable chalcogen carbonyl compound, such as selenourea, by simple hydrolysis thereof under alkaline conditions in the presence of water so... | 06/01/1999 |
| 5672280 | Multiple stage precipitation of heavy metals from acidic aqueous solution For the removal of heavy metal contaminants from industrial waste water, a method is proposed for preparing a dense precipitate having superior handling and disposal properties. The method comprises incremental adjustment of the pH to maintain a low satur... | 09/30/1997 |
| 5364603 | Mercury-free dissolution of aluminum-clad fuel in nitric acid A mercury-free dissolution process for aluminum involves placing the aluminum in a dissolver vessel in contact with nitric acid-fluoboric acid mixture at an elevated temperature. By maintaining a continuous flow of the acid mixture through the dissolver v... | 11/15/1994 |
| 5308501 | Treatment system for alkaline or acidic solution containing heavy metals There is disclosed a method of treating a solution, e.g., an alkaline or acidic solution, containing heavy metals ions therein. With respect to alkaline solutions, the method includes providing a body of the solution; contacting the body with a material s... | 05/03/1994 |
| 5246684 | Method of extracting zinc from brines The present invention provides an improved method of extracting zinc from geothermal brines and synthetic brines which can be performed in a continuous, in-line process and which provides for the advantageous recycling of NH3 in the process.... | 09/21/1993 |
| 5244491 | Method of extracting zinc lead and silver from brines The present invention provides a novel method of extracting zinc from geothermal brines and synthetic brines which can be performed in a continuous, in-line process.... | 09/14/1993 |
| 5162107 | Method of reprocessing zinc- and lead-containing residues from metallurgical plants by means of a circulating fluidized bed system A zinc- and lead-containing residue from a metallurgical plant is reprocessed by a thermal treatment in a circulating fluidized bed system. A major part of the heat demand is satisfied by a combustion of solid carbonaceous material in the fluidized bed re... | 11/10/1992 |
| 5143711 | Process for manufacturing a precursor powder for use in making a varistor and a powder manufactured in this process A method for manufacturing a precursor powder for use in making a varistor is disclosed. This precursor powder is produced by preparing a homogeneous aqueous dispersion of metal oxides and/or metal hydroxides and heating the dispersion in a closed pressur... | 09/01/1992 |
| 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 |
| 5112583 | Process for recovering chromic anhydride from exhausted aqueous chromium plating bath solutions with exploitation of the recovered chromium The chromic anhydride contained in soluble form (chromic acid) in exhausted, polluted chromium plating baths is recovered by alkalizing the exhausted chromium plating liquid to a pH comprised between 3 and 7 at a temperature of 70° C. with a commercial s... | 05/12/1992 |
| 5071722 | Process for preparing cadmium hydroxide, and alkaline secondary battery and method for charging the same The present invention provides a process for easily preparing γ-Cd(OH)2. The present invention facilitates improvement in the charge/discharge performance and energy density of an alkaline secondary battery having a cadmium electrode including... | 12/10/1991 |
| 5041398 | Method for treating incinerator ash A process for treatment of incinerator ash typically including heavy metals and both water soluble and insoluble fractions. The insoluble fraction is first removed from the fly ash. The soluble fraction is treated to precipitate heavy metal compounds. Pre... | 08/20/1991 |
| 5039452 | Metal oxide varistors, precursor powder compositions and methods for preparing same This invention provides a process for making metal oxide varistor precursor powder comprising (a) dissolving soluble precursors of the additive metal oxides, e.g. bismuth nitrate as precursor for bismuth oxide, in an aqueous solution, (b) forming a suspen... | 08/13/1991 |
| 4986977 | Recovery of useful products from by-products of phosphate conversion coating process The process is described for treating the sludge formed in a phosphate conversion bath, and in particular, in zinc phosphate conversion baths to convert the sludge into useful chemical materials thereby eliminating the need for disposal to landfill. The p... | 01/22/1991 |
| 4956157 | Process for separating salts in seawater A process for obtaining available elements from seawater is described, which process includes two separation steps. The first separation step involved adjusting the pH of seawater to a low pH by adding a strong acid having sulphate ion, adding a strongly ... | 09/11/1990 |
| 4894185 | Coprecipitation method for the manufacture of zinc oxide based doped powders A method for manufacturing a zinc oxide based powder by coprecipitation with one or more additions is disclosed. The method comprises: a step for the preparation of one or more solutions by dissolving defined quantities of salts of elements that go into the co... | 01/16/1990 |
| 4655829 | Metal recovery process Metal values are separated from arsenic sulfide ores in a hydrometallurgical oxidation process using a balanced reactant slurry. The molar concentration of As and Sb in the reactant slurry is controlled with respect to the molar concentration of Cu, Pb, a... | 04/07/1987 |
| 4613361 | High-temperature pretreatment by means of an alkaline aqueous solution of ores having an argillaceous gangue containing at least one usable element A process for pretreatment at high temperature by means of an aqueous pretreatment solution, of crushed ores containing at least one usable metal element, whose gangue contains argillaceous compounds which, in the attack operation for making use of the or... | 09/23/1986 |
| 4606765 | Process for treating zinc-laden dust issuing from electric steel plant furnaces In a hydrometallurgical process of treating zinc-laden dust issuing from electric steel plant furnaces the zinc-laden dust is subjected to a basic leaching or lixiviation in two steps. The dust is subjected to a first leaching of the zinc oxide with a rel... | 08/19/1986 |
| 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 |
| 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 |
| 4338200 | Process for the removal of heavy metals from aqueous liquids The invention relates to a process for the removal of heavy metal ions, particularly chromium, lead and/or zinc ions, from aqueous liquids by precipitation wherein the aqueous liquid containing the heavy metal ions and an aqueous liquid containing a base ... | 07/06/1982 |
| 4282190 | Process for the manufacture of iron and aluminum-free zinc chloride solutions A process for the removal of iron and aluminum values from acidic solutions thereof with zinc chloride wherein the solution is subjected to pressure hydrolysis to precipitate the iron and aluminum as the hydroxides or oxide hydrates, and then the precipit... | 08/04/1981 |
| 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 |
| 4222769 | Process of regenerating and recovering lead sulphate-containing wastes A process of regenerating and recovering lead from lead sulphate-containing wastes which comprises (i) contacting the lead battery scrap with an aqueous solution of ammonium carbonate to form lead carbonate and ammonium sulphate, (ii) subjecting the solid phas... | 09/16/1980 |
| 4193769 | ZnO dispersions by decomposition of ZnCO3 This invention relates to stable, fluid zinc-containing dispersions and the preparations thereof by the high temperature decomposition of ZnCO3 to ZnO in a dispersant-containing fluid.... | 03/18/1980 |
| 4176160 | Process for purifying a zinc sulfate solution Process for purifying an iron containing zinc sulfate solution which comprises precipitating iron from said solution as a slurry in at least one of the following forms at a pH which is maintained lower than 4: basic sulfate, jarosite or goethite; filterin... | 11/27/1979 |
| 4124462 | Recovering zinc from a material containing zinc and iron Zinc is recovered from a material containing zinc and iron. The material is leached with sulphuric acid to produce a final pH of 3-5.5. Zinc powder is added to the leaching solution to precipitate polluting metals. Zinc is now extracted with a solution of... | 11/07/1978 |
| 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 |
