Porous silicon dioxide and preparation method thereof

Porous silicon dioxide and preparation method thereof

  • CN 105,600,794 A
  • Filed: 12/31/2015
  • Published: 05/25/2016
  • Est. Priority Date: 12/31/2015
  • Status: Active Application
First Claim
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1. a preparation method for porous silica, comprises the steps:

  • 1) clear water is cleaned plant organ or algae, removes stone and other impurity;

    Wherein said plant organOr algae dioxide-containing silica exceedes 1% of dry weight, described clear water is the water of electrical conductivity lower than 100usv/cm;

    2) drain and in the ashing furnace of 500 degrees Celsius, pass into oxygen and constantly stir;

    And by the oxygen of selfChange and produce heat, maintain 450-600 degree Celsius and within 1-4 hour, obtain plant ass;

    3) remove metal impurities with watery hydrochloric acid washing plant ass;

    Watery hydrochloric acid concentration is 1-5mol/L, and consumption is8-40L/kg plant ass;

    4) clear water is cleaned the porous silica that can obtain high-specific surface area.

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