Abstract
Results are given for studying combined leaching of bauxite, bauxite cake, and sintering section electrostatic precipitator dust. Experiments are performed within the following limiting conditions: temperature 220–260°C, leaching time 30–90 min, return solution concentration 315–280 g/dm3 Na2Oc. It is proven that alumina extraction into solution with combined leaching of bauxite, cake, and electrostatic precipitator dust is higher than with standard bauxite leaching by the Bayer process. A favorable effect is achieved due to forming alumino-ferruginous hydrogarnets during leaching. An increase in leaching temperature makes it possible to improve alumina leaching under stable uniform conditions.
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