Method for extracting aluminium and iron from high-iron bauxite trihydrate
A technology of high-speed iron sanshui and bauxite, which is applied in the field of extracting aluminum and iron, can solve the problems of not using bauxite process method, etc., and achieve the effect of simplifying the process
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[0014] Embodiment of the present invention: the high-iron bauxite bauxite from the mine is sent to the raw material workshop of the alumina factory, and after the raw material is ground to 20 mesh, it is sent to the flat-bottomed mechanical stirring tank for normal pressure stripping, and the stripping condition is Caustic Na 2 o K 140g / l, temperature 103℃, dissolution time 18min, Al 2 o 3 Dissolution rate reaches 59%. The dissolution slurry is classified into coarse and fine red mud, and the coarse red mud is separated and washed by a filter. After filtration, the moisture content of the filter cake is ≤25%; the fine red mud is separated and washed by a settling tank, and the liquid-solid ratio L / S of the bottom flow of the settling tank is 3.0 ~4.0, the settling tank is reverse washed 5~6 times, the liquid-solid ratio L / S of the bottom flow of the washing tank is 2.5~3.0, and then filter with a filter press, and the moisture content of the filter cake after pressing is ≤3...
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