A kind of method using the safe and efficient production sandy alumina of aluminium ash

A kind of method using the safe and efficient production sandy alumina of aluminium ash

  • CN 106,830,030 B
  • Filed: 02/22/2017
  • Issued: 06/08/2018
  • Est. Priority Date: 02/22/2017
  • Status: Active Grant
First Claim
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1. A kind of 1. method using the safe and efficient production sandy alumina of aluminium ash, which is characterized in that include the following steps:

  • 1) activated aluminum dissolves out:

    Aluminium ash is added in into sodium aluminate solution, the addition of the aluminium ash is less than 40g/L every time, and aluminium ash is totalAddition is less than 500g/L, the aluminium ash and reaction temperature of the sodium aluminate solution is 25 DEG C -100 DEG C, the reaction time is10min-15h;

    Separation of solid and liquid obtains one section of dissolution fluid and aluminium lime-ash after the aluminium ash is reacted with the sodium aluminate solution;

    2) raw slurry is prepared:

    Alkali is added in into the aluminium lime-ash and obtains raw slurry with additive, the additive cures the aluminiumFluorine, chlorine element in lime-ash;

    The additive is one or more during calcium containing compound, bauxite and kind point scab;

    It is describedThe addition that calcium containing compound is measured with calcium oxide is less than the 5% of the aluminium lime-ash additive amount, the calcium containing compound is lime,It is one or more in lime stone, calcium aluminate or calcium-silicon slag;

    The bauxite and/or the described kind point of addition to scab are describedThe 10%-200% of the aluminium ash quantity of slag;

    3) clinkersintering:

    The raw slurry is sintered to obtain clinker;

    4) Clinker digestion:

    The clinker is added in into adjustment liquid dissolution and obtains two sections of dissolution slurries;

    5) sandy alumina is made:

    One section of dissolution fluid, two sections of dissolutions slurries are entered into Bayer Process digestion slurries togetherDilution system, and with Bayer process system production sandy alumina.

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