Method of recovering waste sulfuric acid and waste gas produced in tatanium dioxide production

Method of recovering waste sulfuric acid and waste gas produced in tatanium dioxide production

  • CN 1,262,335 C
  • Filed: 06/07/2004
  • Issued: 07/05/2006
  • Est. Priority Date: 06/07/2004
  • Status: Active Grant
First Claim
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1. , the sulfur waste acid that produces in a kind of production process of titanium pigment, the recovery method of waste gas is characterized in that:

  • comprise the following steps;

    1. the stove waste gas and the sulfur waste acid that produce in the production process of titanium pigment sent into mixing in " titanium dioxide stove tail gas is carried dense dilute sulfuric acid graphite tower ", gas-liquid contact, concentrated, the stepping of going forward side by side is gone into gas-liquid separator, gas-liquid separation;

    2. above-mentioned isolated spent acid liquid is sent into solid-liquid separator, with acid and the divided titanium dioxide that wherein contains from, the acid solution that obtains after the separation enters the steam concentration systems and carries out concentration;

    3. handle in the concentrated acid solution input crystallization kettle that will be after 2. step is handled, form the mixed liquor of inorganic salts crystalline particle and acid, then inorganic salts crystalline particle in the mixed liquor be separated, the acid that further concentrates;

    4. the concentrated acid solution that will obtain after 3. step is handled is sent in the carborundum evaporimeter, and part moisture is removed in evaporation under negative pressure state, makes acid concentration reach 80~

    90%, gets final product.

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