Method for recovering silicon powder from monocrystalline and polycrystalline silicon cutting wastes by utilizing potential adjustment centrifugal process

Method for recovering silicon powder from monocrystalline and polycrystalline silicon cutting wastes by utilizing potential adjustment centrifugal process

  • CN 102,659,112 A
  • Filed: 05/23/2012
  • Published: 09/12/2012
  • Est. Priority Date: 05/23/2012
  • Status: Active Application
First Claim
Patent Images

1. the method for silica flour in electric potential regulating reclaiming by centrifuge monocrystalline and the polysilicon cutting waste material, its characteristicBe that it may further comprise the steps:

  • The pre-treatment of cutting waste materialIn silicon single crystal and polysilicon cutting waste material, add entry, and add small amount of acid, stir after 3~

    4 hours, filter the mixed powder of oven dry and grinding dispersed silicon and silit;

    (2) surface potential of regulation and control mixed powderThe mixed powder of silicon and silit is added entry according to certain liquid-solid ratio 3~

    10;

    1, and adding acid or alkali, to regulate the pH value be 6~

    9, stirs;

    (3) centrifugal separation processesBehind the centrifugal several times of mixing liquid, obtain stratified sample up and down and the settling of upper strata Si-rich phase suspension and lower floor richness silit is taken out respectively;

    (4) surface potential of adjustment Si-rich phase is with quick recovery silica flourThe upper strata suspension-s that obtains after centrifugal is Si-rich phase, adds rare acid for adjusting pH value to 1~

    3, and the silicon particle aggregation becomes larger particles and sedimentation rapidly, obtains silica flour behind the filtering drying.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×