PROCESSING METHOD OF BAUXITES ON ALUMINA

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Processing method of bauxites on alumina, including grinding bauxite in circulating solution, leaching, condensing with obtaining aluminate solution and the red slime, washing red sludge, decomposing aluminate solution to form hydro aluminium oxide and mother solution, evaporation of mother solution to obtain return solution, calcination hydro aluminium oxide to obtain alumina, ; after milling bauxite in circulating solution obtained pulp is heated to removing water from circulating solution to produce dry residue, evaporated water is condensed, are connected with dry residue and directed to leaching of, after operation thickening red slime aluminate solution is subjected to operation of desiliconization of with production of a white slime and aluminate solution, which is directed to operation of decomposition, characterized in that red sludge after the thickening and of washing is subjected to stirring with sulfuric acid with creation of suspension and maintenance of ph within 2.5-3.5 at temperature 50-70°C, after which suspension is divided on solid residue and solution diffusion nnym content of rare-earth metals, which is directed to selection of concentrate of rare-earth metal, solid residue is directed for obtaining iron containing product.