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| Number | Title | Issue Date |
| 7014832 | Simultaneous recovery of potassium chloride and KCL enriched edible salt The present invention relates to recovery of industrial grade potassium chloride and low sodium edible salt from bittern as part of an integrated process. The process comprises, mixing low sulphate concentrated feed bittern (a by-product of salt industry) of density... | 03/21/2006 |
| 6776972 | Recovery of common salt and marine chemicals from brine A new process for recovery of common salt, potassium chloride, concentrated magnesium chloride with enriched bromide, and high purity magnesia from brine in an integrated manner, said process comprises preparation of calcium chloride by reaction of hydrochloric acid... | 08/17/2004 |
| 6622523 | Method of converting halogenated compounds to glass The present invention provides a two stage process of thermal separation of CFCs and HCFCs followed by vitrification of the waste into a commercially viable glass. In the first stage, the hydrogenated compounds are reacted at elevated temperature with wat... | 09/23/2003 |
| 6482371 | Process for separation of heavy metals and halogen from waste material or residue A process for the separation of heavy metal and halogen from unwanted waste material or residue. Halogen is selectively extracted or washed out from the waste material. Metal is selectively extracted or washed out from the essentially halogen free waste m... | 11/19/2002 |
| 6476287 | Sulfite treatment of spent industrial wastes A method of treating metal-contaminated spent foundry sand, or other industrial waste, by combining the sand with a sulfite to produce insoluble metal sulfur oxide complexes that do not leach from the sand. The treated waste may also be processed to reduc... | 11/05/2002 |
| 6319482 | Treatment of fly ASH/APC residues including lead salt recovery The present invention relates to a process for treating fly ash/APC residues chlorides, sulphates, earth alkali metals selected from the group consisting of calcium, potassium, and sodium, and heavy metals selected from the group consisting of lead, which... | 11/20/2001 |
| 5881359 | Metal and fluorine values recovery from fluoride salt matrices The process for converting feed materials of high mineral content containing primary metal values and fluorine values to the primary metal or useful compounds thereof and to fluorine values or useful compounds thereof, wherein the feed materials constitut... | 03/09/1999 |
| 5851500 | Removal of uranium contamination from magnesium fluoride slag Magnesium fluoride slag contaminated with metallic uranium or uranium compounds is treated by digestion with potassium hydroxide to soluble potassium fluoride and insoluble magnesium hydroxide. The solid and liquid phases are then separated and the solids... | 12/22/1998 |
| 5516496 | Metal and fluorine values recovery from fluoride salt matrices The process for converting feed materials of high mineral content and substantial radioactivity levels to concentrated radionuclide products of high radioactivity levels and to other products of discard or very low radioactivity levels, wherein the feed m... | 05/14/1996 |
| 5409680 | Purification of aqueous alkali metal chlorate solutions A process for removing alkaline earth metal impurities (e.g. calcium and magnesium ions) from an aqueous alkali metal chlorate solution which includes adding sufficient alkali metal carbonate or hydroxide or both to the impure solution to raise the pH to ... | 04/25/1995 |
| 5324501 | Method for the preparation of low-chloride plaster products from calcium-containing residues of flue-gas purification plants Disclosed herein is a method for producing plasters that contain chloride contents of less than 0.5% by weight from calcium-containing impure products or residues having a high chloride content (e.g., about 10% or higher based on the total product or resi... | 06/28/1994 |
| 5312604 | Work-up of waste materials from barium or strontium sulfide leaching A process for working-up waste materials from barium sulfide or strontium sulfide leaching in which the amount of waste material to be disposed of is substantially decreased.... | 05/17/1994 |
| 5246687 | Solid-state preparation of high purity barium sulfate A novel, solid-state, low-temperature preparation of barium sulfate provides a higher purity material than that obtained by the conventional method of precipitation. The reaction involves heating a barium oxysalt in the presence of at least one sulfur-con... | 09/21/1993 |
| 5120514 | Process for production of magnesium chloride Process for production of magnesium chloride with sufficient purity for the production of magnesium metal, by leaching a magnesium containing raw material in hydrochloric acid. It is essential to keep the ratio between acid soluble iron and nickel greater... | 06/09/1992 |
| 5110474 | Method for liquid chromatographic extraction of strontium from acid solutions A method and apparatus for extracting strontium and technetium values from biological, industrial and environmental sample solutions using a chromatographic column is described. An extractant medium for the column is prepared by generating a solution of a... | 05/05/1992 |
| 5089094 | Process for the electrolytic production of magnesium In a process for the electrolytic production of magnesium by the molten salt electrolysis of magnesium chloride using a molten salt cell bath comprised mainly of one or more salts selected from alkali metal chlorides and alkaline earth metal chlorides, th... | 02/18/1992 |
| 5066474 | Method for sulfur dioxide production from calcium sulfate by entrained high-temperature slagging reduction A method for production of sulfur dioxide from calcium sulfate by high temperature thermal reduction. Calcium sulfate, preferably in the form of calcined phosphogypsum, is desulfurized using a fossil fuel as a heat source, the combustion products resultin... | 11/19/1991 |
| 5055281 | Process for the preparation of calcium fluosilicate as a raw material for obtaining calcium fluoride and pure fluosilicic acid Process for the production of anhydrous calcium fluosilicate from anhydrous calcium chloride and impure fluosilicic acid solution, a by-product of the acid treatment of phosphorus ores containing fluorine, characterized in that a calcium fluosilicate dihy... | 10/08/1991 |
| 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 |
| 4946658 | Addition of pyritic materials to feed mix for desulfurization of phosphogypsum A pelletized mixture of gypsum, carbonaceous material and pyrite is charged to a travelling grate where the charge is heated under suitable conditions to produce a solid sintered material which has a broad spectrum of applications due to its chemical and ... | 08/07/1990 |
| 4874599 | Magnesium fluoride recovery method A method of obtaining magnesium fluoride substantially free from radioactive uranium from a slag containing the same and having a radioactivity level of at least about 7000 pCi/gm. The slag is ground to a particle size of about 200 microns or less. The gr... | 10/17/1989 |
| 4838941 | Magnesium cement A reaction product of at least one of magnesium carbonate and magnesium silicate, with a metal chloride at a temperature exceeding 300° C. Such a product, when mixed with water, sets to be an immensely strong magnesium cement. It may have aggregates of v... | 06/13/1989 |
| 4734272 | Phospho-gypsum recovery process This disclosure involves a process for treating wet phospho-gypsum, a by-product from wet phosphoric acid manufacture, to remove fluorine values so as to make the sulfur values in the phospho-gypsum usable in making sulfuric acid in a contact sulfuric aci... | 03/29/1988 |
| 4698219 | Treatment of waste from iron ore reduction Spent flux containing calcium oxide and calcium sulfide, recovered from the reduction of iron ore, is carbonated, as an aqueous slurry, in two stages, with the first stage being operated at a pH to prevent reaction of calcium sulfide, and the second stage... | 10/06/1987 |
| 4608238 | Process for treating phospho-gypsum waste product from wet-acid process of making phosphoric acid This disclosure concerns an improved phospho-gypsum recovery process in which phospho-gypsum waste product and coke are first heated to remove moisture, some SO2 and other vaporous matter, then heated to a higher temperature in a reducing atmos... | 08/26/1986 |
| 4584118 | Metal trithiocarbonates as depressants Metal trithiocarbonates such as Na2 CS3 are useful depressant for such sulfided minerals as copper and iron sulfides in molybdenum recovery.... | 04/22/1986 |
| 4564507 | Reductive decontamination of magnesium fluoride A method is described for decontaminating magnesium fluoride resulting from the reduction of uranium fluoride to the metal by reaction with magnesium. This decontamination employs reactions with magnesium and carbon to remove radioactive components from t... | 01/14/1986 |
| 4563339 | Process for the preparation of magnesium chloride for use as an electrolyte in electrolytic production of magnesium metal In electrolytic production of magnesium metal the concentration of magnesium chloride in the bath is required to be replenished periodically or continuously. This magnesium chloride should be anhydrous and of certain specifications. This invention provide... | 01/07/1986 |
| 4560812 | Recovery of glycerine from saline waters Glycerine is recovered from an aqueous waste stream containing but minor amounts of glycerine by the requested steps of; (1) evaporating, (2) contacting with pentanol, (3) separating precipitated salt, (4) flashing to remove pentanol, and (5) vacuum disti... | 12/24/1985 |
| 4526761 | Apparatus for chlorination of molten magnesium chloride salts An apparatus for chlorination of molten magnesium chloride salts, comprising a shell lined with a refractory material and having the interior thereof formed by walls, a bottom and a cover. The lower portion of the shell walls is provided with chlorine inl... | 07/02/1985 |
| 4504092 | Treatment of carnallitic ores In a treatment of carnallitic ores by treatment with a decomposition-brine containing amounts of MgCl2, KCl and NaCl suitable for precipitating artificial sylvinite in a solution of MgCl2 saturated in KCl and NaCl, the improvement of... | 03/12/1985 |
| 4503018 | Desulfurization of phosphogypsum Phosphogypsum is mixed with fine coal, balled, and charged to a travelling grate where the charge is heated under reducing conditions to evolve sulfur and/or sulfur dioxide for conversion into sulfuric acid.... | 03/05/1985 |
| 4483827 | Hydrometallurgical process for the recovery of valuable metals from sulfidic, silicate-containing raw materials The invention relates to a process for the recovery of valuable metals from sulfidic, silicate-containing raw materials by slurrying the raw material in water, by subjecting the slurry to a selective leach under atmospheric conditions and in an acidic mil... | 11/20/1984 |
| 4462976 | Method for the treatment of chloride-containing waste waters Treatment of waste water containing chlorides comprising treatment with Ca (OH)2 or CaCO3 to convert the chlorides to CaCl2, adding sulfuric acid to said water in a reaction vessel to produce hydrochloric acid and gypsum, ... | 07/31/1984 |
| 4415543 | Process for treating phospho-gypsum waste product from wet-acid process of making phosphoric acid This disclosure concerns a process for treating phospho-gypsum waste product from the wet process method of making phosphoric acid including the steps of water washing the phospho-gypsum to remove all but an acceptable level of fluorine before the phospho... | 11/15/1983 |
| 4379718 | Process for separating solid particulates from a melt A process for treating a metal recovery byproduct which contains solid ash constituents entrained in a melt comprising a major amount of a molten salt and a minor amount of molten metal in which the melt is filtered through a high-temperature filter appar... | 04/12/1983 |
| 4341752 | Method for purification and concentration of MgCl2 -brines Method for producing purified and concentrated MgCl2 -brine by evaporation and crystallization from brines containing MgCl2, KCl, NaCl and MgSO4 involving recirculation of carnallite and part of the final product brine. Th... | 07/27/1982 |
| 4312842 | Process of manufacture of phosphoric acid with recovery of co-products An improved process for the wet-acid process for manufacture of phosphoric acid with recovery of valuable co-products is provided. Phosphate rock is digested in a sulfuric acid/phosphoric acid mixture. Phosphoric acid is filtered from the digested rock, t... | 01/26/1982 |
| 4248839 | Chlorination of impure magnesium chloride melt Magnesium oxide is chlorinated in molten impure magnesium chlorine with chlorine gas by adding ferrous chloride to magnesium chloride brine, drying the brine, adding a mixture of calcined petroleum coke and charcoal to the dried brine, melting the product... | 02/03/1981 |
| 4224291 | Method of dehydrating carnallite A method of dehydrating carnallite, residing in that preliminarily enriched carnallite with 39-41 wt. % water is heated up to 205°-230° C. by fuel combustion products having a temperature of 500°-600° C., and a partially dehydrated carnallite with 3-8... | 09/23/1980 |
