This paper is concerned with a process of production of pure alumina from red mud by using solvent extraction. The mineral acid leaching of the red mud roasted at 900°C with (NH₄)₂CO₃ or (NH₄)₂CO₃ and (NH₄)₂SO₄ gave the high aluminum dissolution and the high selectivity for iron. Separation of aluminum from the leach solution containing aluminum and iron mainly must be achieved before it can be precipitated as aluminum salts.
Various extractants including tri-n-butyl phosphate, high molecular amines and carboxylic acid were used in order to separate aluminum and iron with solvent extraction technique. All of extractants showed the selective extractability of iron. Tri-n-butyl phosphate, tri-n-octyl amine and Amberlite LA-2 can be utilized for chloride leach solutions, while Priment JMT can be used in the case of sulphuric acid leaching. When red mud is leached with fairly dilute mineral acids, Versatic Acid is available to extract iron without adjusting hydrogen ion and anion concetrations in the leach solution.

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In this paper a short survey on the mineral resources, mineral production and mining industry in Turkey, with a particular emphasis on coal, has been given. The survey reveals that Turkey has limited sources of minerals and does not play a significant role in the world mineral industry.

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Recently, the demands for the rare earth are remarkably increasing. Therefore, the concentration of the rare earth minerals comes to be very important. In this paper the concentration processes of monazite and bastnaesite, which are gravity separation, high intensity magnetic separation, high tension separation and flotation process, are described.

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