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7595037 |
Method and apparatus for hydration of a particulate or pulverulent material containing CaO, hydrated product, and use of hydrated product
Described is a method as well as an apparatus for hydration of a particulate or pulverulent material containing CaO. The method is peculiar in that water is added in a quantity which will ensure...
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7553465 |
Cerium oxide powder and cerium oxide dispersion
Cerium oxide powder having carbonate groups and made of crystalline primary particles containing cerium oxide and having carbonate groups on the surface and in a region close to the surface, and...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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.
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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 SO 2 and other vaporous matter, then...
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4584118 |
Metal trithiocarbonates as depressants
Metal trithiocarbonates such as Na 2 CS 3 are useful depressant for such sulfided minerals as copper and iron sulfides in molybdenum recovery.
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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...
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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...
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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...
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4504092 |
Treatment of carnallitic ores
In a treatment of carnallitic ores by treatment with a decomposition-brine containing amounts of MgCl 2 , KCl and NaCl suitable for precipitating artificial sylvinite in a solution of MgCl 2 ...
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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...
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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...
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4462976 |
Method for the treatment of chloride-containing waste waters
Treatment of waste water containing chlorides comprising treatment with Ca (OH) 2 or CaCO 3 to convert the chlorides to CaCl 2 , adding sulfuric acid to said water in a reaction vessel to produce...
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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...
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4341752 |
Method for purification and concentration of MgCl.sub.2 -brines
Method for producing purified and concentrated MgCl 2 -brine by evaporation and crystallization from brines containing MgCl 2 , KCl, NaCl and MgSO 4 involving recirculation of carnallite and part...
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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...
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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...
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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...
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4180546 |
Process for removing phosphorus from phosphorus-containing fluorite
A process for removing a phosphorus component from fluorite containing such phosphorus component, which process comprises adding powder of the fluorite to an aqueous acid solution having an acid...
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4171342 |
Recovery of calcium fluoride from phosphate operation waste water
Calcium fluoride is produced from pond waters resulting from phosphoric acid processing by treating the pond waters with calcium carbonate and/or calcium oxide in two stages to precipitate out the...
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4144312 |
Desulfurization of fluorite ores
Fluorite ores and concentrates commonly contain sulphur as an impurity usually as the sulphate. This sulphur can be largely removed by heating the ore or a concentrate under reducing conditions. In...
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4144311 |
Purifying salts containing organic pollutants
A process for purifying organically polluted salts comprising forming a melt of said salts at a temperature of from about 600°to 1000° C., and contacting salt melt with an oxygen-containing gas....
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4076602 |
Method of producing magnesium metal and chlorine from MgCl.sub.2 containing brine
A method of producing magnesium and chlorine including the steps of injecting concentrated magnesium chloride containing brine into a hot gas spray drier wherein most of the water is evaporated to...
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4056599 |
Process for the recovery of magnesium chloride hydrate and potassium chloride from carnallite and bischofite
Carnallite, comprising principally of MgCl 2 . KCl.6H 2 O, with varying amounts of sodium chloride and other impurities, is dissolved in a lower saturated monohydric aliphatic alcohol having from...
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3980536 |
Process for producing magnesium metal from magnesium chloride brines
Magnesium metal is produced by electrolysis of a molten magnesium chloride electrolyte containing fluoride ions, the electrolyte being derived from holding pond brines which are partially...
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3953574 |
Process for purifying molten magnesium chloride
Spray-dried magnesium chloride salt containing minor amounts of impurities in the form of oxygen containing compounds including metal oxides and in particular particulate magnesium oxide, hydroxyl...
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3953573 |
Removal of boron from MgCl.sub.2 brines
Minute amounts of boron present in naturally occurring brines found in oceans, inland seas, salt lakes and the like are removed by treating the brine with a solid, finely divided lignite.
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3939249 |
Purification of talc
An arsenic sulfide mineral impurity, such as gersdoffite, is removed from talc by an oxidative leach treatment at a pH below 2.
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3925028 |
Treatment of seawater brines with an alcohol to recover a fertilizer quality double salt
The present invention relates to a novel method for the recovery of potassium and magnesium salts in the form of insoluble precipitates of potassium sulfate together with magnesium sulfate and or...
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