Aluminum Company of America

Marlyn D Ballain

Roy A Christini

Kenneth A Bowman

Larry K King

Robert L Hargis

Rolf Rolles

Leroy D Hart

Roy E Hardwick

Calcium is produced by a thermal reduction process in a reaction-condensation system having a reaction zone and a condensation zone. According to the process, a reducing agent is contacted or reacted in the reaction zone with at least a partially molten slag to produce calcium vapor. The calcium vapor is transported from the reaction zone to the condensation zone and condensed therein.

Thermal reduction process for production of calcium using aluminum as a

Magnesium is produced by a thermal reduction process in a reaction-condensation system having a reaction zone and a condensation zone. According to this process, a reducing agent containing a mixture of ferrosilicon and at least 25 wt. % aluminum skim is contacted or reacted in the reaction zone with a calcium-silicon-aluminum-magnesium oxide slag to produce magnesium vapor. The magnesium vapor is transported from the reaction zone to the condensation zone and condensed therein.

Thermal reduction process for production of magnesium using aluminum

Magnesium is produced by a thermal reduction process in a reaction-condensation system having a reaction zone and a condensation zone. According to this process, a reducing agent containing ferrosilicon and at least 25 wt. % aluminum is contacted in the reaction zone with a calcium-silicon-aluminum-magnesium oxide slag to produce magnesium vapor. The magnesium vapor is transported from the reaction zone to the condensation zone and condensed therein. The slag is maintained to contain from 1 to 8 wt. % MgO, at least 9 wt. % Al.sub.2 O.sub.3, and have a CaO/SiO.sub.2 weight ratio no less than that provided by the formula 2.1+0.03 (wt. % Al.sub.2 O.sub.3 -9). The slag is also maintained so as to decrepitate upon cooling.

Thermal reduction process for production of magnesium

Hot vapors of aluminum chloride and by-products produced in the chlorination of aluminous material to form aluminum chloride are cooled by contacting the vapors with solid aluminum chloride as the vapors exit from the reactor and before the vapors come in contact with filter materials. This cooling reduces the temperature of the vapors from an initial temperature of about 600.degree.-800.degree. C down to about 300.degree.-350.degree. C thereby preventing or inhibiting attack of the filter materials by the hot vapors.

Cooling aluminum chloride vapors by contact with solid aluminum chloride

A system for rehydration of green ceramic structures, particularly thin-walled extrusions, comprising immersing the structure into a fluid bath maintained at a temperature of 50.degree.-100.degree.C. The green ceramic structure is rehydrated using the moisture in the green ceramic structure. The liquid acts as a support, a temperature control, and a means for preventing moisture escape and premature drying of the ceramic during rehydration.

System for rehydration of curing of shaped activated green ceramic

Catalyst substrates characterized by superior structural properties and a subsequent high degree of catalytic activity are produced by using a blend of colloidal silica and specially activated alumina which blend is subsequently rehydrated and activated under certain specified conditions. In a preferred embodiment the substrate is activated at a temperature of 1200.degree.-1400.degree.C to provide a substrate characterized by the absence of free silica.

Growing community of inventors

Belleville, IL, United States of America

Marlyn D Ballain