Showing papers by "Kaiser Aluminum published in 1968"

Load supporting plank system

Abstract: THIS INVENTION RELATES TO AN IMPROVED LOAD SUPPORTING PLANK SYSTEM COMPRISED OF A SERIES OF REMOVABLY INTERLOCKED PLANKS WHEREIN THE JOINTS FORMED BY THE VARIOUS MARGINAL EDGES OF THE INTERLOCKED PLANKS ARE PROVIDED WITH UNIQUE LOCKING AND SEALING MEANS TO PREVENT THE PENETRATION OF WATER AND THE LIKE THROUGH THE SAID JOINTS AND FACILITATE THE INSTALLATION OF THE SYSTEM.

Waste combustion afterburner

Abstract: AN AFTERBURNER FOR OXIDIZING GASEOUS WASTES COMPRISES AN ELONGATED, FRUSTOCONICAL REFRACTORY CHAMBER OF INCREASING INTERNAL CROSS-SECTIONAL AREA FROM ENTRANCE TO EXIT. NEAR THE ENTRANCE END, HEAT IS INTRODUCED INTO THE CHEMBER TO RAISE THE TEMPERATURE OF THE GASEOUS WASTE PRODUCTS TO THE POINT WHERE THEY WILL SPONTANEOUSLY OXIDIZE WHEN MIXED WITH FLUENT OXIDIZER. THE FLUENT OXIDIZER (E.G., AIR) IS INTRODUCED IN SPACED SEQUENTIAL FASHION ALONG THE LENGTH OF THE CHAMBER.

Method of producing alkalized alumina and products produced thereby

Abstract: AN IMPROVED ALKALIZED ALUMINA CAPABLE OF ABSORBING SO2 IS PREPARED FROM SELECTIVELY CALCINED ALUMINA WHICH IS CAPABLE OF AT LEAST PARTIAL REHYDRATION, BY CONTACTING THE ALUMINA WITH AN MHCO3 COMPOUND, WHEREIN M IS SELECTED FROM ALKALI METALS AND NH4 RADICAL TO FORM AT LEAST ABOUT 30% BY WEIGHT ALKALIZED ALUMINA HAVING THE EMPIRICAL FORMULA OF MA1(OH)2CO3.

Alumina feed control

Abstract: A method of controlling the feeding of alumina to a reduction cell for the production of aluminum. The method comprises obtaining several measurements of the voltage across the cell and current to the cell and deriving from the measurements an average resistance level for the cell which will be referred to as a base level. A smoothed resistance is derived from several sequential measurements of the voltage and current. When the smoothed resistance exceeds the base resistance level by more than an assigned limit, a controlled amount of alumina is added to the cell.

Production of potassium chloride from carnallitic salts

Abstract: Potassium chloride is produced from carnallitic salts consisting essentially of carnallite KCl.MgCl2.6H2O) and halite (NaCl). The salt is contacted with an aqueous medium to dissolve selectively the magnesium chloride, leaving a solid phase of KCl-NaCl mixture. This mixture is admixed with an amount of aqueous medium at least sufficient to dissolve substantially all of the NaCl and then the admixture is subjected to evaporation. The KCl will crystallize from the system and the crystals are washed to recover fertilizer grade KCl of at least 95 percent purity.

Apparatus for lubricating a molten metal mold

Abstract: Improved lubrication of an open-ended mold assembly for casting of molten metal into a solidified metal body. The mold assembly includes a mold surface and has a capillary gap in communication therewith. Lubricant is admitted in controlled amounts to the capillary gap to at least one predetermined location thereof in order to effect improved lubrication about the mold surface during casting of molten metal.

Stable liquid polyisocyanate compositions

Abstract: LIQUID AROMATIC POLYISOCYANATES ARE STABILIZED AGAINST CRYSTALLIZATION AND SEDIMENT FORMATION AT TEMPERATURES BELOW THEIR SOLIDIFICATION POINT BY THE ADDITION OF A STABILIZING AMOUNT OF AN ORGANO-SILICONE.

System and apparatus for quick quenching continuously heated strip

Abstract: System and apparatus for quick quenching a continuously moving solution heat treated aluminum or aluminum alloy strip and the like in a substantially instantaneous fashion promptly after the strip exits from a solution heat treatment furnace, wherein a relatively thin curtain of liquid coolant of substantially uniform cross-sectional thickness from one curtain edge to the other is applied to at least one side of and in a straight line across and transverse of the strip and wherein an improved arrangement is employed for enclosing the strip in a heated gaseous envelope substantially immediately after it exits from the furnace to preclude contact of the strip with the atmosphere prior to quenching and to prevent back splash of the coolant from the line of coolant application and a deleterious premature quenching of the strip and wherein the application of the coolant is fully coordinated with enclosing the strip in the heated gaseous envelope.

Method of making a foamed alumina shape or catalyst support

Abstract: A hydrated alumina which has been calcined to reduce its loss on ignition to below 12 percent and which is capable of at least partial rehydration is mixed with water and a blowing agent to form a slurry. The slurry is heated to below 100* C. to activate the blowing agent causing bubbles to form in the slurry. The slurry is then poured into a mold and heated to cause the alumina to rehydrate stabilizing the foamed body which is then activated at 350*-700* C.

The precipitation kinetics of copper in silicon near room temperature

Abstract: Electrical conductivity measurements were employed to investigate the kinetics of copper precipitation out of supersaturated silicon between 30°C and 70°C. The kinetics were observed to follow a (time) n rate equation where n=0·687 ± 0·043. An activation energy of 1·10 ± 0·05 ev was found for the process. The results are discussed with reference to current theories of precipitation at dislocations. It was concluded that the reaction is not diffusion controlled, and a transient rate limitation theory was employed to describe the results qualitatively.

Decolorization of aromatic isocyanates

Abstract: DISCLOSED AROMATIC POLYISOCYANATES CONTAINING METHYLENEDIPHENYL DIISOCYANATES ARE DECOLORIZED BY THE ADDITION OF DIPHENYL-DECYL PHOSPHITE THE DECOLORATION IS EFFECTED BY REACTING OR CHEMICALLY BONDING THE HYDROLYZABLE CHLORIDE ATTACHED TO THE METHYLENE BRIDGE OF THE DIISOCYANATE

Process for producing carbamates

Abstract: Carbamates are produced by reacting alkyl amines with phosgene, directly admixing the resultant reaction mixture containing Nalkyl-carbamoyl chloride and alkyl isocyanate with an active hydrogen containing compound selected from the group consisting of aliphatic alcohols and thioalcohols, phenols and thiophenols, alicyclic alcohols and thioalcohols. The produced carbamate is recovered from this mixture in high-yield and purity.