Method for preparing superfine nano-silicon by taking silicon-containing biomass as raw material as well as prepared superfine nano-silicon and application thereof

Method for preparing superfine nano-silicon by taking silicon-containing biomass as raw material as well as prepared superfine nano-silicon and application thereof

  • CN 104,671,247 A
  • Filed: 02/11/2015
  • Published: 06/03/2015
  • Est. Priority Date: 02/11/2015
  • Status: Active Application
First Claim
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1. be the method that superfine nano silicon prepared by raw material with silicon containing biomass, it is characterized in that comprising the steps:

  • 1) silicon containing biomass Acid treatment is removed inorganic ion impurity, repeatedly dry after cleaning;

    2) by

         1) in acid boil after silicon containing biomass obtain white SiO 2 powder after 400-1000 DEG C of heat treated 1-12h in atmosphere;

    3) be 1;

    (0.5-5 by silicon-dioxide, magnesium powder, fused salt according to mol ratio);

    the amount ball milling of (3-30) mixes, then mixture is put into tube furnace and be heated to 600-900 DEG C of insulation 1-12h with the heat-up rate of 1-30 DEG C/min, cool to the furnace after room temperature until product and take out;

    4) by

         3) middle products therefrom pickling, after repeatedly cleaning suction filtration, drying obtains ultra-fine nano silicon particles.

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