Method for preparing aluminum oxide from low aluminum-silicon ratio aluminum-containing mineral

Method for preparing aluminum oxide from low aluminum-silicon ratio aluminum-containing mineral

  • CN 101,100,304 A
  • Filed: 04/10/2007
  • Published: 01/09/2008
  • Est. Priority Date: 04/10/2007
  • Status: Active Application
First Claim
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1. , a kind of aluminum-containing mineral by low alumina silica ratio prepares method of alumina, it is characterized in that may further comprise the steps:

  • (1) fine grinding will be hanged down the alumina silica ratio aluminum-containing mineral and will be milled down to below the 10 μ

    m;

    (2) magnetic separation is carried out iron removal by magnetic separation with the levigated mineral;

    (3) acid treatment will be lower than aluminum-containing mineral and 90~

    98% strong sulfuric acid responses below 0.5% through iron level behind the iron removal by magnetic separation, the Tai-Ace S 150 that the stripping reaction generates;

    (4) filtering separation, filtrate are alum liquor, and filter residue is SiO 2, obtain Al at 100~

    120 ℃

    of evaporated filtrates 2(SO 4) 318H 2O;

    (5) thermal dehydration decomposes, with Al 2(SO 4) 318H 2O is heated to 400~

    500 ℃

    of dehydrations, obtains anhydrous slufuric acid aluminium, and anhydrous slufuric acid aluminium is heated to 800 ℃

    , divides to solve γ

    -Al 2O 3And SO 3Gas;

    (6) reclaim SO 3Flue gas is used sulfuric acid absorption SO 3Flue gas is made the vitriol oil, returns the acid treatment operation and recycles.

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