The coagulation properties of HCCA in the system “aluminate solution - nepheline sludge” were studied, which allowed to improve the processes of thickening and washing of nepheline sludge. Solutions were developed aimed at the improvement of the coarse alumina production technology on the basis of increasing the efficiency of the carboaluminate method for separating Al (III) and Si(IV) hydroxo complexes and using the combined crystal growing modifier CaCO3 – HCCA.
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