The technique for reducing sulfate concentration in waste water stream by using regeneration gibbsite

The technique for reducing sulfate concentration in waste water stream by using regeneration gibbsite

  • CN 104,936,907 B
  • Filed: 11/25/2013
  • Issued: 09/04/2018
  • Est. Priority Date: 11/27/2012
  • Status: Active Grant
First Claim
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1. the method for removing sulfate from waste water stream comprising:



  • a)

    Gibbsite and calcium source are mixed with waste water stream so that entringite precipitates and generate effluent, wherein the effluentIn sulfate concentration be considerably smaller than the sulfate concentration in the waste water stream;



    b)

    Gibbsite is set to regenerate by following steps:

    I. acid is mixed with entringite and is settled out gibbsite particle;

    Ii. crystallization processes are imposed by the gibbsite particle to precipitation to make the average particle size of the gibbsite particle of precipitation increaseIt is added to 30-35 μ

    m or higher;

    And(

    c)

    By average particle size be 30-35 μ

    m or higher regeneration gibbsite recycling, and by with the average particle size againRaw gibbsite is mixed with waste water stream,It refers to 50% or more gibbsite that the wherein described regeneration gibbsite, which has 30-35 μ

    m or higher average particle size,Grain is 30-35 μ

    m or bigger.

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