Claims
- 1. A process for purifying silica sand, consisting:
- a) abrasive-attritioning a sand particle mixture by subjecting the sand particles to centrifugal rotation under dry conditions, while simultaneously agitating the particles with translative eccentric, downstream, and upstream movements, wherein the surface impurities are removed from the sand particles, and
- b) eliminating the impurities from the sand particle mixture.
- 2. A process for purifying silica sand, as in claim 1, wherein the abrasive-attritioning step is carried out in the presence of 0% to about 10% humidity.
Parent Case Info
This application is a continuation-in-part of Ser. No. 07/706,220, filed May 28, now abandoned.
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3297402 |
Chubb |
Jan 1967 |
|
4401638 |
Caballero et al. |
Aug 1983 |
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4405588 |
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6573726 |
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Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
706220 |
May 1991 |
|