Recovery of Alumina From Non-Bauxite Aluminum-Bearing Raw Materials

Advances in Raw Material Industries for Sustainable Development Goals

“…Increased worldwide demand for aluminum oxide, currently at more than 160 million tons per year, is expected to lead to a gradual global decline of highgrade bauxite, the ore from which alumina is mainly produced using the Bayer process. Many aluminum-producing countries have thus become increasingly interested in the investigation of producing alumina from non bauxitic sources , Cohen & Mercier, 2016, Protosenya & Trushko, 2007.…”

“…Thermal treatments at a controlled temperature range were generally applied to increase the activity of kaolin before the acidic and alkaline extraction procedure due to the low chemical reactivity of kaolinite (Sizyiakov et al, 2013). The process is generally thought to increase clay reactivity by affecting dehydration transformation of the kaolin to amorphous metakaolinite (Al 2 Si 2 O 7 ), which is known to be more reactive and from which alumina can be easily extracted by acidic or alkaline leaching agents (Cohen & Mercier, 2016, Sizyiakov, 2006.…”