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4246249 |
Silicon purification process
A method for purifying silicon comprises the steps of providing a body of molten silicon-rich material and extracting heat therefrom to provide a solid phase containing silicon in crystal form and...
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4224035 |
Method of separating salts from solution
Disclosed is an improved method of separating a first salt and a second salt from an aqueous solution containing both salts and salt impurities, where the solubility of the first salt increases...
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4224037 |
Method for operating multiple effect evaporators
Disclosed is an improved method of recovering a salt having a solubility which increases with increasing temperatures from a multiple salt aqueous solution also containing a salt having a...
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4224036 |
Method of concentrating salt solutions
Disclosed is an improved method of concentrating an aqueous solution containing a first salt and a second salt, the solubility of the first salt increasing more greatly with increasing temperatures...
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4195067 |
Process for the production of refined metallurgical silicon
Silicon platelets essentially free of iron are precipitated from a solution of metallurgical grade silicon in molten aluminum and are melted in contact with silica slag to produce a refined...
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4171205 |
Process for obtaining an aluminum sulfate hydrate from an impure sulfuric acid solution of aluminum sulfate
Process for recovering aluminum in the form of a specific acid sulfate from an initial solution containing aluminum in the form of dissolved aluminum sulfate hydrate in which the specific acid...
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4120911 |
Method for concentrating a slurry containing a solid particulate component
An improved method for the concentration of a slurry containing a solid particulate component is described. In the method, the slurry is contacted with a rotatable filtration assembly and some...
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4094731 |
Method of purifying silicon
A process for producing crystalline silicon having an iron concentration less than about one-twentieth of the iron concentration of the mother liquor. Iron contaminated silicon is introduced into a...
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4091084 |
Purification of HgI.sub.2 for nuclear detector fabrication
A process for purification of mercuric iodide (HgI 2 ) to be used as a source material for the growth of detector quality crystals. The high purity HgI 2 raw material is produced by a combination...
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4042674 |
Process for treating the mother liquor by cooling in the production of anhydrous sodium dithionite
In the production of anhydrous sodium dithionite by reacting sodium formate, an alkaline sodium compound and sulfurous acid anhydride in hydrous methanol, a process for treating the mother liquor,...
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3996031 |
Fractionation of multicomponent dimethylnaphthelenes feeds by selective crystallization
A process and system for separating a preferentially crystallizable component A from a feed, wherein a series of zones are used between which mother liquor can flow without passage of crystallized...
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3986923 |
Removal of dissolved salts from sulphide liquors
Sodium chloride is removed from Kraft mill smelts by fractionating the smelt to separate sodium carbonate and sodium sulphate in solid form from sodium sulphide and sodium chloride which usually is...
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3977835 |
Cooling process for selective salt crystallization
Salable salt values in a complex brine are recovered by cooling to crystallize mirabilite, then using solar evaporations to recover readily processable groupings of sodium salts and potassium salts.
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3972711 |
Cuprous chloride recovery process
A process is disclosed for separating cuprous chloride from a solution comprising cuprous chloride and at least one metal chloride compatible with the solubility of cuprous chloride, the process...
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3967930 |
Separation of complex potassium salts from brine evaporites
Evaporite minerals comprising mixtures of relatively coarse salts are treated in a manner such that certain of said salts are converted by recrystallization to very finely divided form and then...
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3966445 |
Freeze refining method
An improved freeze refining method including the steps of collecting a heterogeneons material in crystalline form from a heated melt containing pure and impure materials and removing the collected...
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3965247 |
Recovery of sodium nitrite from by-product process liquors containing sodium chloride
According to the present invention, sodium nitrite is recovered from an aqueous solution containing dissolved sodium nitrite and sodium chloride by a process which comprises subjecting said...
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3963795 |
Separation of isomers by selective melting in an immiscible liquid
A process is disclosed for separating the isomers of xylene from a mixture of C 8 aromatic isomers by the steps of: 1. cooling the C 8 aromatic isomers to a temperature of about -65°C to...
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3963424 |
Cooling aqueous alkali metal hydroxide liquors by vacuum evaporation with subsequent solids precipitate removal
A method and apparatus for cooling aqueous alkali metal hydroxide liquors such as, for example, caustic soda liquors, involving the vacuum cooling of a body of such liquor in an evaporating chamber...
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3933573 |
Aluminum nitride single crystal growth from a molten mixture with calcium nitride
A method for growing single crystals which utilizes calcium nitride as a solvent system in the molten solution growth of bulk aluminum nitride crystals.
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3925027 |
Process for producing salt having a reduced calcium sulfate content
A process for preparing from brine (an aqueous solution of salt) containing appreciable quantities of dissolved calcium sulfate either (1) high purity salt (sodium chloride) having the usual cubic...
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3902859 |
Method for separating ammonium sulfate from an aqueous solution of ammonium bisulfate and ammonium sulfate
A method is disclosed for separating ammonium sulfate from an aqueous solution of ammonium bisulfate and ammonium sulfate, and, in particular, where the aqueous solution additionally contains...
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3892539 |
Process for production of crystals in fluidized bed crystallizers
A fluidized bed crystallizer has a relatively long tapered crystallizer column beneath a generally cylindrical column, with product withdrawal at a point below the top of the fluidized bed and...
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3890097 |
Method of purifying wet process phosphoric acid
The present invention relates to a method of purifying wet process phosphoric acid wherein the phosphoric acid solution is diluted with sulfuric acid, the diluted acid solution is cooled to a...
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3876386 |
Method of producing vanadium sludge
The present invention relates to methods of producing vanadium sludge in the production of alumina contemplating processing of alunites and bauxites into such final products as alumina and...
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3747907 |
NIGHT STREAM COOLING SYSTEM AND METHOD
A cooling water storage system includes two water storage ponds, one pond being located at a higher elevation than the other. The water temperature in the lower pond is reduced by flowing the water...
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3653847 |
INHIBITION OF SODIUM BICARBONATE CRYSTALLIZATION DURING CRYSTALLIZATION OF OTHER MATERIALS USING POLYPHOSPHATES
A process of separating a material consisting of at least one salt selected from the group consisting of sodium tetraborate and sodium sulfate from aqueous solutions containing the same and sodium...
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3586090 |
METHOD FOR EVAPORATING BRINE
A method is provided for evaporating brines, such as sea water, in a system in which the brine is transferred to successive evaporating zones wherein blocking of the transfer lines is avoided....
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3531944 |
CRYSTALLISATION PROCESS
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3515521 |
APPARATUS FOR THE SEPARATION OF SALTS FROM SOLUTIONS
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3505218 |
MULTIPHASE NON-METALLIC COMPOSITIONS OF MATTER
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3498758 |
METHOD OF RECOVERING STRONTIUM CHLORIDE
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3498914 |
MULTIPHASE COMPOSITIONS OF MATTER
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3461679 |
SEPARATING LIQUEFIABLE MATERIALS FORMING SOLID SOLUTIONS
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3449087 |
PURIFICATION BY SELECTIVE CRYSTALLIZATION AND REMELT
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3442622 |
REFINING OF SILICON
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3429668 |
SEPARATING ALKALI METAL HALATES FROM HALIDES BY ADDITION OF AMMONIA
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3428437 |
ZONE REFINING
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3424549 |
MULTISTAGE SEPARATION OF COMPONENTS OF A SOLUTION
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3423187 |
PROCESS FOR REMOVING ALKALI METAL SULFATES FROM ALKALI METAL HYDROXIDE SOLUTIONS
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3384459 |
Separation of sodium chloride from potassium by selective crystallization
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3365278 |
Recovery of potassium chloride from sodium chloride solution
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3362457 |
Apparatus and method for concentrating solutions
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3337305 |
Purifying caustic aluminate solutions with ammonia
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3336115 |
Separately crystallizing boric acid and alkali sulfate from aqueous solution by evaporation at different temperatures
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3216481 |
Recovery of phthalic and maleic acid from solutions
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3190732 |
Zone refining methods and apparatus
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3189419 |
Zone-melting crystallization technique
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3117859 |
Zone refining process
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3093649 |
Fractional crystallization process
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