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4169054 |
Process for concentrating and purifying aqueous sulphuric acid solutions
Concentrated sulphuric acid aqueous solutions, stably clear through the time, are obtained starting from diluted sulphuric acid aqueous solutions containing Mg and possibly other impurities such as...
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4100264 |
Process for the preparation of calcium carbonate for use in fluorescent lamp phosphors
A method of producing finely-divided phosphor grade calcium carbonate having a calcite crystalline structure and a very low sodium content. The calcium carbonate is produced from calcium chloride...
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4050905 |
Growth of doped crystals
Large, doped crystal ingots are grown in a Stockbarger furnace from a melt of an alkali metal or alkaline earth metal salt using very slow oscillation (1 - 2 cycles per minute) of the ingot through...
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4044105 |
Process for preparation of calcium hydrogen phosphate anhydride
An aqueous slurry of CaHPO 4 .2H 2 O in a 5-20 Wt% concentration is prepared by the use of the phosphate dihydrate obtained by reaction of NaNH 4 HPO 4 .4H 2 O with CaCl 2 in water. After...
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4008309 |
Process for crystallizing calcium nitrate
Large-sized calcium nitrate tetrahydrate particles are obtained by dissolving phosphate rock in concentrated nitric acid, cooling the resulting solution, intentionally terminating the...
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4001127 |
Process of preparing single crystals of strontium barium niobate
In a process of preparing single crystals of strontium barium niobate of the type wherein melt of a mixture of strontium oxide, barium oxide and niobium pentoxide is prepared and a single crystal...
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3989472 |
Method for producing high bulk density magnesium chloride
An anti-foaming agent is added to magnesium chloride containing brine prior to spray drying to produce a spray dried product comprising discrete particles of relatively high bulk density.
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3981818 |
Crystalline materials
A composition of matter transparent to infrared rays and shock resistant which is a directionally grown, polycrystalline solidified melt of a eutectic composition comprising at least two components...
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3975283 |
High bulk density magnesium chloride and method for making same
A gelling agent is added to a brine containing magnesium chloride to convert the brine into a gel which is spray dried to produce dried magnesium chloride comprising substantially solid discrete...
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3974039 |
Addition of finely divided BaSO.sub.4 particles to sea water for removal of scale components
A process of reclaiming drinking and industrial water from sea water, accing to which the sea water to be processed is subjected to a pretreatment, comprising filtering, acidifying and degassing...
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3947553 |
Process for preparing pure barium nitrate crystals
A malleable or press-forgeable ingot of barium fluoride, for use as an optical body, may be grown from an ultra-pure precipitate of barium fluoride which contains less than 10 parts per million...
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3927180 |
Method of converting brushite to monetite crystals with controlled variation in crystal habit
Control of pH and temperature allows conversion of brushite to monetite of specific crystal habit: e.g., rectangular (needle) having a basal plane acute angle of approximately 90°; thin...
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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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3899304 |
Process of growing crystals
A process of growing ionic crystals which comprises providing a support of a molten material, floating a melt of an ionic material (ionic melt) on the molten support material, the molten support...
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3883313 |
MODIFIED CZOCHRALSKI-GROWN MAGNESIUM ALUMINATE SPINEL AND METHOD OF MAKING SAME
A modified, Czochralski-grown, single-crystalline spinel has a nominal composition (MgO)(Al 2 O 3 ) x , where x can be between 1 and 2.3. The spinel has an (OH) ion content in its lattice that is...
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3878295 |
Method of producing high density calcium chloride 1/3 hydrate
Method to produce a high density calcium chloride particulate. Calcium chloride hydrate is precipitated from a saturated solution maintained at about 185°C. to about 230°C. The precipitate is...
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3853488 |
PROCESSING OF CALCIUM CARBONATES
A method of treating a wet processed natural calcium carbonate to produce a bulk-handlable material in which the wet processed natural calcium carbonate is partially dewatered to obtain a...
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3852044 |
RECOVERY OF SUBSTANTIALLY POTASSIUM-FREE HYDRATED MAGNESIUM CHLORIDE FROM CONTAMINATED AQUEOUS SOLUTIONS
Aqueous solutions containing magnesium chloride as the major dissolved salt but contaminated with sulfate, potassium and sodium to the extent that magnesium chloride produced by evaporating the...
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3847597 |
PROCESS FOR THE COMBINED ELIMINATION AND/OR RECONDITIONING OF CARBURIZING SALT WASTES
A process for the elimination and/or reconditioning of carburizing salt wastes resulting from the hardening of various steel products, including, nitrite- and nitrate-containing wastes, sometimes...
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3778234 |
PROCESS FOR GROWING CRYSTALS USING AN OZONE ENRICHED HYDROGEN-OXYGEN FLAME
A flame fusion process for the formation of high melting refractory oxide single crystals using a hydrogen-oxygen flame substantially enriched in ozone. The enrichment of the flame with ozone...
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3723337 |
HYDROTHERMAL PROCESS FOR GROWING CRYSTALS HAVING THE STRUCTURE OF BERYL IN HIGHLY ACID CHLORIDE MEDIUM
A hydrothermal process for growing relatively large macro-crystals having the structure of beryl. Growth takes place on seed crystals from an aqueous medium which has a chloride ion concentration...
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3723596 |
HYDROMAGNESITE HAVING A MODIFIED MORPHOLOGY AND METHOD FOR THE PREPARATION THEREOF
Light hydromagnesite in spherical aggregates of small crystals having a pore volume superior to 4,000 mm. 3 /g. is provided by precipitating hydromagnesite from an aqueous solution containing a...
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3715191 |
APPARATUS FOR MAKING WET PROCESS PHOSPHORIC ACID
An apparatus and method for improving the filterability of wet process phosphoric acid reaction slurry. The slurry is divided into a least two segments, one of which contains only calcium sulfate...
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3714329 |
PROCESS FOR PREPARING STRONTIUM CARBONATE
Strontium carbonate is prepared having a desired crystal size by continuously and simultaneously adding an aqueous solution of strontium sulfide and sodium carbonate to a reaction mass containing...
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3663180 |
METHOD OF PRODUCING CALCIUM CARBONATE SINGLE CRYSTALS
A method of producing calcite single crystals by floating-zone melting of a polycrystalline rod of calcium carbonate and an eutectic mixture, for example, of calcium carbonate and lithium carbonate...
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3658473 |
METHOD FOR THE MANUFACTURE OF MAGNESIUM HYDROXIDE
Magnesium salt-containing solution, calcium hydroxide, and 4 to 20 gms. calculated in the form of MgO of magnesium hydroxide seed, per liter of said magnesium salt-containing solution, are...
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3658586 |
EPITAXIAL SILICON ON HYDROGEN MAGNESIUM ALUMINATE SPINEL SINGLE CRYSTALS
An improvement in the manufacture of integrated electronic circuits of the type including an insulating substrate and components occupying isolated portions of an epitaxial layer of a semiconductor...
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3642455 |
PROCESS FOR RECOVERING LOW-SULFATE BISCHOFITE
Aqueous brines containing both magnesium chloride and magnesium sulfate are treated to recover a low-sulfate bischofite (MgCl 2 . 6H 2 O). The brines are subjected to evaporation, as required,...
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3642454 |
PRODUCTION OF POTASSIUM CHLORIDE FROM CARNALLITIC SALTS
Potassium chloride is produced from carnallitic salts consisting essentially of carnallite KCl . MgCl 2 . 6H 2 O) and halite (NaCl). The salt is contacted with an aqueous medium to dissolve...
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3642456 |
PROCESS FOR PURIFYING GYPSUM USING FLUOSILICIC ACID
In abstract, this invention is directed to a process for purifying crude gypsum, comprising dissolving the gypsum in a hot aqueous fluosilicic acid solution, separating the resulting gypsum...
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3640865 |
NEW FERROELECTRIC MATERIALS AND PROCESS OF PREPARATION
New transparent ferroelectric compositions have been prepared having a tetragonal tungsten-bronze-type crystallographic structure and having the formula x(ANbO 3 ) . (1-x) MNb 2 O 6 where A is...
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3634029 |
PRODUCTION OF FEED GRADE DICALCIUM PHOSPHATE FROM MIXTURES OF PHOSPHORIC AND NITRIC ACIDS
Feed grade dicalcium phosphate is produced from mixtures of phosphoric and nitric acids wherein the H 3 PO 4 /HNO 3 molar proportion ranges from 0.5 to 9.0, the phosphate being precipitated by...
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3634033 |
METHOD FOR THE PRODUCTION OF SINGLE CRYSTALS
An improved arc-fusion method for the production of high-quality single crystals at comparatively low cost. An arc is established in a first refractory sinterable powder pack to form a first...
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3630691 |
METHOD OF GROWING MAGNESIUM OXIDE WHISKERS
A method of growing magnesium oxide whiskers by a vapor-liquid-solid mechsm comprising sintering fine-grained polycrystalline magnesium oxide having a selected impurity element therein and then...
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3619131 |
METHOD OF PRODUCING STOICHIOMETRIC MG-AL SPINEL CRYSTALS FOR INTEGRATED CIRCUITS
A method of producing Mg-Al spinel crystals of a stoichiometric composition free from precipitation and tension. The invention is characterized in that the carrier crystal is an alumina-rich spinel...
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3615259 |
SOLAR POND SYSTEM FOR THE PRODUCTION OF CONCENTRATED BRINES UTILIZING PLURAL SERIAL SOLAR SUBZONES
A solar evaporation zone receives a brine of a given concentration with respect to a particular soluble salt and produces effluent brine of a higher concentration with respect to that salt. A...
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3615260 |
LEACHING BERYLLIUM
A method of leaching beryllium from beryllium ore and separating the beryllium from contaminates in the leach liquor, the leaching method comprising exposing beryllium ore to a concentrated caustic...
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3539291 |
PREPARATION OF STARTING MATERIALS FOR PHOSPHATE PHOSPHORS
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3518049 |
CRYSTAL GROWTH IN AQUEOUS SOLUTION UTILIZING COMPLEXING AGENTS
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3505012 |
PROCESS FOR MAKING BRUSHITE FORM OF CALCIUM HYDROGEN PHOSPHATE
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3499725 |
METHOD OF PROCESSING KAINITE ORES THROUGH INTERMEDIATE FORMATION OF LANGBEINITE
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3498758 |
METHOD OF RECOVERING STRONTIUM CHLORIDE
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3497329 |
PRODUCTION OF PHOSPHORIC ACID
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3495953 |
METHOD OF SEPARATING STRONTIUM CHLORIDE FROM MIXED SOLUTIONS USING ETHANOL
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3468801 |
SYNTHESIS OF GARNET AT HIGH PRESSURES
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3466144 |
TREATMENT OF NICKELIFEROUS OXIDIC MATERIALS FOR THE RECOVERY OF NICKEL VALUES
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3443890 |
PROCESS FOR THE PRODUCTION OF CALCIUM CARBONATE
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3420625 |
RECRYSTALLIZATION OF ANHYDROUS CALCIUM ACID PHOSPHATE FROM THE DIHYDRATE FORM
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3414389 |
Removal of calcium sulfate solids from sulfuric acid slurries
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3409412 |
Process for producing butterfly twin barium titanate single crystals and barium titanate mixture used therein
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