Patent
Carbothermic reduction and prereduced charge for producing aluminum-silicon alloys
TLDR
In this article, a method for the carbothermic reduction of aluminum oxide to form an aluminum alloy including producing silicon carbide by heating a first mix of carbon and silicon oxide in a combustion reactor to an elevated temperature sufficient to produce silicon carbides at an accelerated rate, the heating being provided by an in situ combustion with oxygen gas.Abstract:
Disclosed is a method for the carbothermic reduction of aluminum oxide to form an aluminum alloy including producing silicon carbide by heating a first mix of carbon and silicon oxide in a combustion reactor to an elevated temperature sufficient to produce silicon carbide at an accelerated rate, the heating being provided by an in situ combustion with oxygen gas, and then admixing the silicon carbide with carbon and aluminum oxide to form a second mix and heating the second mix in a second reactor to an elevated metal-forming temperature sufficient to produce aluminum-silicon alloy. The prereduction step includes holding aluminum oxide substantially absent from the combustion reactor. The metal-forming step includes feeding silicon oxide in a preferred ratio with silicon carbide.read more
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Patent
Method and reactor for production of aluminum by carbothermic reduction of alumina
Jan Arthur Aune,Kai Johansen +1 more
TL;DR: In this article, a hollow partition wall is employed to feed carbon material to an underflow of a carbothermic reduction furnace used to make aluminum, and the partition wall divides a low temperature reaction zone (2) where aluminum oxide is reacted with carbon to form aluminum carbide and a high temperature reaction Zone (3) where the aluminum carbides and remaining aluminum oxide are reacted to form aluminium and carbon monoxide.
Patent
Electric furnace with insulated electrodes and process for producing molten metals
TL;DR: In this article, an electric arc furnace (10) having a partially insulated electrode (37) produces molten metal (28) such as foundry iron from an iron source where little or no slag is produced.
Patent
Graphite Electrode for Electrothermic Reduction Furnaces, Electrode Column, and Method of Producing Graphite Electrodes
TL;DR: In this article, a graphite electrode for an electrothermic reduction furnace is formed from anode grade coke and graphitized at a graphitization temperature below 2700° C.
Patent
Process for producing foudry iron
TL;DR: In this paper, a submerged arc furnace produces foundry iron from scrap iron and steel sources where little or no slag is produced, and the amount of the silica source and carbon reducing agent are added in an amount to selectively control the silicon and carbon content of the resulting foundry foundry IR.
Patent
Method using selected carbons to react with Al2O and Al vapors in the carbothermic production of aluminum
TL;DR: In this article, a method for recovering Al from an off-gas (3,4) produced during carbothermic reduction of aluminum utilizing at least one smelter is presented.
References
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Journal ArticleDOI
Reaction of Clay and Carbon to Form and Separate Al2O3 and SiC
TL;DR: In this paper, the authors showed that the solid-solid reaction proceeds through gaseous intermediates of CO and SiO, and that the optimum conditions for ease of separation of Al2O3 and SiC and the high rate of reaction require pelletization of both the clay-carbon mixture and the carbon of reaction.
Patent
Aluminum purification system
TL;DR: In this article, a method for extracting aluminum of substantial purity from furnace products resulting from carbothermic reduction of alumina-bearing ores and contaminated with up to about 30 weight percent of aluminum carbide is disclosed.
Patent
Energy efficient production of aluminum by carbothermic reduction of alumina
TL;DR: In this article, a method for production of aluminum by carbothermic reduction of Al 2 O 3 in a stack-type reactor is described. But the method requires an expenditure of 32.7 megajoules of electrical energy and 3.45 kg C.
Patent
A process for the preparation of silicon or ferrosilicon
TL;DR: In this article, the ratio of the thermal energy supplied to the furnace to the amount of silicon oxide supplied by the furnace is made adjustable in such a manner that a value for the ratio can be set within an interval, which interval in its lower end is limited by the lowest value permitting constant reduction of the silicon monoxide and silicon directly with a certain part of the reducing agent which is supplied at the top of the furnace, and in its upper end is restricted by the highest value permitting the silicon oxide raw material to be converted to silicon carbide.
Patent
Carbothermic reduction process
TL;DR: A carbothermic process for the production of aluminum contaminated with no more than about 10 weight percent of aluminum carbide is described in this paper, which involves charging alumina values and carbon values into a furnace and subjecting only a minor portion of said charge at any given time of an open arc so as to heat the reagents to reaction temperture.