Aluminothermic Synthesis of Corundum from Natural Topaz

Structure and properties of alumina bubble obtained by electrodispersion of AD0E grade electrical aluminum waste in distilled water

“…The most common methods of obtaining α-Al 2 O 3 (corundum) powder are methods in which aluminum hydroxide (hydrargillite) or aluminum oxyhydroxide (boehmite) is sintered in air at temperatures above 1200 °C and calcination of aluminum hydroxide at 500-1500 °C in an atmosphere of hydrogen halide in the presence of seed crystals. The disadvantages of these methods are high energy consumption, the size of the obtained corundum crystals cannot be regulated, as well as environmental problems [5][6][7][8].…”