| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 423099000 | Group IIB metal (Zn, Cd, or Hg) | 17 |
| 20080241027 | METHOD AND APPARATUS FOR REMOVING MERCURY FROM COMBUSTION EXHAUST GAS - A method for reducing mercury emissions in combustion flue gas is provided. The method includes combusting coal such that a flue gas flow is created. The flue gas flow includes at least mercury and carbon-containing fly ash. The method further includes cooling the flue gas flow within a duct and creating turbulence in the flue gas flow. The mercury is removed from the flue gas flow. | 10-02-2008 |
| 20080241028 | METHODS AND APPARATUS TO FACILITATE REDUCING MERCURY EMISSIONS - A method for reducing an amount of mercury in flue gas is provided. The method includes injecting a quantity of coal having a fineness of less than 70%<200 mesh and greater than or equal to 50%<200 mesh. The quantity of coal is combusted in a quantity of air such that at least carbon-containing fly ash and mercury are formed. Mercury is oxidized using at least the carbon-contain fly ash. | 10-02-2008 |
| 20080241029 | METHODS AND APPARATUS FOR REMOVING MERCURY FROM COMBUSTION FLUE GAS - A method for reducing an amount of mercury in flue gases generated by the combustion of coal is provided. The method includes combusting a quantity of coal and a quantity of air within a primary combustion area such that a fly ash containing carbon and elemental mercury is formed within the flue gases, supplying air to the primary combustion area such that a portion of the air is channeled to an overfire air burnout area downstream from the primary combustion area to facilitate increasing an amount of the carbon content in the fly ash, cooling the flue gases to facilitate oxidizing the elemental mercury using the carbon content in the fly ash, and injecting sorbent into the flue gases to facilitate further reducing the amount of mercury in the flue gases. | 10-02-2008 |
| 423100000 | Ion exchanging or magnetic separating | 1 |
| 20110293493 | METHOD FOR EXTRACTING ZINC FROM AQUEOUS AMMONIACAL SOLUTIONS - A method for extracting zinc from an aqueous ammoniacal zinc solution containing impurities, the method comprising the steps of: (i) contacting the aqueous ammoniacal zinc solution containing impurities with an organic phase comprising an ammonium salt of an organic extractant dissolved in a hydrophobic diluent, allowing transfer of the zinc to the organic phase and transfer of ammonium to the aqueous phase, thereby providing a zinc-enriched, ammonium-depleted organic phase and an ammonium-enriched, zinc-depleted aqueous phase containing impurities; (ii) separating the zinc-enriched, ammonium-depleted organic phase from the ammonium-enriched, zinc-depleted aqueous phase containing impurities; (iii) contacting the zinc-enriched, ammonium-depleted organic phase with an aqueous solution containing positively charged species, allowing transfer of the zinc from the organic phase and transfer of positively charged species from the aqueous phase, thereby providing an aqueous zinc solution and an organic phase containing a zinc-depleted organic extractant; and (iv) recovering the zinc from the aqueous zinc solution. | 12-01-2011 |
| 423101000 | Forming insoluble substance in liquid | 10 |
| 20100034716 | Separation method for zinc sulfide - The separation method for zinc sulfide, in the hydrometallurgical process by a High Pressure Acid Leach for nickel oxide ore comprising leaching and solid/liquid separation step, neutralization step, zinc removal step, and nickel recovery step, which can inhibit clogging of a filter cloth and reduce a frequency of washing operation and replacement operation of a filter cloth by improving filtration performance of zinc sulfide, and inhibit decrease of nickel recovery ratio, in the zinc removal step in which zinc sulfide is formed by adding a sulfurizing agent to the neutralization final liquid containing zinc as well as nickel and cobalt and zinc sulfide is separated to obtain a mother liquid for nickel recovery containing nickel and cobalt. | 02-11-2010 |
| 20120201729 | Method and Device for Separation of Recoverable Material from Products Containing Mercury - Method of separating recoverable material from products containing mercury. The method including crushing products to form crushed material, mixing crushed material with a liquid which has an oxidizing agent which has been chosen from a group which sodium hypochlorite, hydrogen peroxide and chlorates, oxidizing at least a portion of metallic mercury in the products for forming mercury oxide under influence of oxidizing agent. The method further includes separating a sludge, which sludge having formed mercury oxide, from at least a portion of the liquid. | 08-09-2012 |
| 20130064743 | PROCESS FOR PURIFYING ZINC OXIDE - A process for separating zinc from a feedstock containing a mixture of metals and metal compounds. The process includes leaching a zinc-containing feedstock with a concentrated basic solution, optionally diluting the slurry with an amount of water sufficient to reduce the viscosity of the slurry thereby facilitating separation of a pregnant liquor containing dissolved zinc from insoluble materials, separating the insoluble materials from the pregnant liquor, and precipitating zinc oxide from the pregnant liquor by adding an anti-solvent to the pregnant liquor. The described process also provides for recycling of the basic solution and the anti-solvent. | 03-14-2013 |
| 423103000 | Halogenating | 3 |
| 20110268632 | HYDROMETALLURGICAL METHOD FOR THE REUSE OF SECONDARY ZINC OXIDES RICH IN FLUORIDE AND CHLORIDE - The present invention relates to a method for removing halides, in particular chlorides and fluorides, from starting secondary zinc oxides, for example Waelz or Primus oxides, comprising the steps (1) for washing the secondary zinc oxides with sodium carbonate and separating the solid residue from the basic liquid, (2) leaching at least one portion of the solid residue of step 1 by means of H | 11-03-2011 |
| 20120288424 | METHOD FOR THE REMOVAL OF CHLORIDE FROM ZINC SULPHATE SOLUTION - The invention relates to a method for removing chloride from zinc sulphate solution in conjunction with zinc production. According to the method, the chloride is removed from solution by means of monovalent copper, which is produced in a separate copper(I) oxide formation stage, in which the pH is regulated to the region of 4.5-5. | 11-15-2012 |
| 20140205519 | PROCESS FOR RECOVERING ZINC AND/OR ZINC OXIDE II - A process for recovering zinc from a zinc containing material, the process including the steps of: leaching the zinc containing material with an alkaline lixiviant comprising an aqueous mixture of NH | 07-24-2014 |
| 423104000 | Hydroxylating or hydrating | 2 |
| 20140037519 | METHOD FOR PRODUCING OXIDE/HYDROXIDE - Provided is a method for producing an oxide and/or hydroxide wherein the ratio of oxide and hydroxide has been controlled. The method produces an oxide, a hydroxide, or a mixture thereof, and obtains an oxide and/or a hydroxide wherein the ratio of oxide and hydroxide has been controlled by means of changing a specific condition relating to at least one fluid to be processed introduced between processing surfaces ( | 02-06-2014 |
| 20140212348 | HYDROMETALLURGICAL METHOD FOR RECOVERY OF ZINC IN SULPHURIC MEDIUM STARTING FROM SULPHIDIC ZINC CONCENTRATES WITH HIGH IRON CONTENT - This method is based in the recirculation of an iron free solution or a solution with low iron content in such a manner that the final acidity conditions obtained are ideal for iron to efficiently precipitate as jarosite. | 07-31-2014 |
| 423105000 | Carbonating | 2 |
| 20130216456 | SELECTIVE LEACH RECOVERY OF ZINC FROM A COMPOSITE SULPHIDE ORE DEPOSIT, TAILINGS, CRUSHED ORE OR MINE SLUDGE - Zinc and lead are usually concomitantly present in Zn—Pb ores and tailings. A novel non-polluting hydrometallurgical process for selectively leaching and recovering zinc (Zn) from a composite lead (Pb) and zinc sulphide containing mineral, crushed untreated rock or unconsolidated mineral particles, mill tailings and/or agglomerated or unagglomerated sulphidic zinc containing waste material without necessitating smelting and refining operation has been developed. A combination of selected oxidant and alkali metal hydroxide has been found effective. A leachant consisting of e.g. a mixture of sodium hydroxide (NaOH) and sodium hypochlorite (NaOCl) is employed to selectively dissolve zinc sulphide at high pH at standard temperature and pressure (STP). The kinetics of leaching along with the effect of varying concentration (preferably of sodium hydroxide and sodium hypochlorite) were systematically investigated. Feed ore containing diverse set of minerals e.g. sulphides and carbonates can also be conveniently treated to selectively and almost quantitatively recover zinc as high purity zinc carbonate. This technology can be employed either in-situ or ex-situ based on the amenability of a particular type of mineral deposit or feed ore. | 08-22-2013 |
| 20140105797 | Precipitation of Zinc from Solution - A method of precipitating a zinc containing solid from an acidic solution containing dissolved zinc and magnesium comprising contacting the solution with a calcium containing neutralising agent to raise the pH of the solution to 4.5 to 7.5 at a temperature of from 70 to 95° C. to thereby precipitate a solid zinc containing material and gypsum without causing substantial precipitation of magnesium, and separating the zinc containing material from the gypsum. | 04-17-2014 |
| 423109000 | Leaching, washing, or dissolving | 2 |
| 20080241030 | Emission Control System - Methods and apparatus utilizing chlorine dioxide and hydrogen peroxide are useful to reduce emissions of NOx, SOx, and heavy metals, e.g., mercury, emissions from combustion flue gas streams. | 10-02-2008 |
| 20100086455 | METOHD OF PRODUCING OXIDE AND POWER THUS OBTAINED - Method for producing hydrometallurgical zinc oxide powder having characteristics equivalent to that derived from a French process, comprising formation of an aqueous pulp from a starting zinc oxide having particles of nodular structure, wet milling of this aqueous pulp, separation in this milled pulp between a liquid phase and a solid phase containing the zinc oxide, and drying of said solid phase, coupled with a mechanical deagglomeration of the particles during drying, to obtain a dry zinc oxide powder with particles of nodular structure having a particle size distribution where the particles have an average size (d50) between 0.02 and 20 μm. | 04-08-2010 |
| 423110000 | Desulfurizing | 1 |
| 20080233024 | Method of mercury removal in a wet flue gas desulfurization system - Controlling the reductive capacity of an aqueous alkaline slurry ( | 09-25-2008 |
