A technology has been developed for obtaining macrocrystalline tricalcium hydroaluminate (hydrogarnet), which is used in the production of alumina as a filtering addition at the stage of separation of red muds from aluminate solution. The technology allows hydrogarnet crystals of 8 to 12 micrometers in size to be obtained.

  Produced according to the proposed technology, hydrogarnet greatly improves the filtering process at the stage of red mud separation: the filtering cycle duration increases (nearly twice), and the filtrate quality is perfected, in particular, the content of calcium and iron ions in the filtrate decreases.

    ADVANTAGES

    The technology can be easily adapted to available equipment of alumina plants and requires no considerable investments.
      The technology has been introduced at the Ural Aluminum Plant (Kamensk-Uralsky, Russia).