Engineering & Technologies 4 (2015 8) 419-429 ~ ~ ~ УДК 669.712 Positive Role of Magnetic Separation Within Processing of Sideritized Bauxites of Kazakhstan Viktor М. <...> One option of the bauxite chemical benefi cation is desiliconization by alkaline solution of bauxite subjected to preliminary thermal activation. <...> Experimental data on the leaching of initial and calcined bauxite by recycle solution indicates that the preroasting of high-siderite bauxites enables to use Bayer process with better technological parameters [4]. <...> Roasting improves the condensability of red mud, however, considering that the operation of roasting is associated with large energy costs, alternative technological scheme of low-quality gibbsite bauxites processing from various deposits of Kazakhstan has been proposed and tested in the laboratory and pilot scale. <...> Логинов Национальный минерально-сырьевой университет «Горный» Россия, 199106, Санкт-Петербург, 21-я линия, 2 За последние годы применительно к высококремнистым бокситам выполнено большое количество работ, направленных на изыскание методов обогащения сырья, усовершенствование комбинированного последовательного способа Байер-спекания и разработку нового гидрометаллургического метода их переработки. <...> Dubovikov… Positive Role of Magnetic Separation Within Processing of Sideritized Bauxites. предварительную термическую активацию. <...> Однако, учитывая, что операция обжига связана с большими энергозатратами, была предложена и проверена в лабораторном и опытно-промышленном масштабе альтернативная технологическая схема переработки низкокачественных гиббситовых бокситов различных месторождений Казахстана. <...> Laboratory testing of the bauxite two-stage leaching technology with preliminary magnetic separation Technology includes ore grinding on mother liquor, pulp separation in strong magnetic fi eld and processing of non-magnetic fraction by using sequential Bayer – sintering method. <...> Magnetic fraction processing is recommended to carry out either in a separate branch or by sintering together with red mud. <...> Technology of alumina extraction from non-magnetic fraction corresponds with the existing one at the Pavlodar aluminum plant. <...> There is big amount of iron-containing minerals: hematite and siderite. <...> For modeling plant conditions of bauxite grinding on the mother liquor ones acted as follows. <...> Initially, the dry bauxite was milled to the desired particle size, then it was stirred for 20 min with the mother <...>