Tatabanyai Szenbanyak

Akademia Gorniczo-hutnicza Im. Stanislawa Staszica

Jerzy Grzymek

Bronislaw Werynski

Laszlo Kapolyi

Geza Szentgyorgyi

Gyorgy Vamos

Anna Derdacka

Stanislaw Bethke

Zofia Konik

Anna D Grzymek

A low grade aluminum and silicon containing starting material is intimately mixed with limestone and the resultant mixture is fluidized. The fluidized mixture is preheated to a temperature of 700.degree. to 900.degree. C., then held at sintering temperature for 5 to 10 minutes. Aluminum may be recovered by extraction of the sintered powder so produced.

Process for producing high-purity alumina and hydraulic cement

A method for obtaining aluminum oxide where the smelted metallurgical slag is subjected to a slow cooling and then self-decomposition by simultaneous action of ultrasound or vibration of high frequency, carried out, which accelerates the formation, in a glassy (vitrous) phase, of a polymorphous, crystalline, high-temperature modification of calcium aluminate, 12 CaO.multidot.7Al.sub.2 O.sub.3, which can be easily lixiviated with aqueous solutions of soda. From lye liquors after extraction, the aluminum oxide is then recovered and the residue, after lixiviation, is burnt to standard portland clinker keeping possibly the lowest proportion of the quantity of clinker produced in relation to the quantity of obtained aluminum oxide.

Method for obtaining aluminum oxide

Growing community of inventors

Warsaw, Poland

Jerzy Grzymek