| 摘要 |
Sand containing impurities that weaken its suitability as a proppant in well boreholes can be refined by the process of (1) drying the sand to remove moisture, (2) grinding the sand in a jet mill to create particle-on-particle contact of the sand and impurity grains, and (3) removing pulverized impurities from the sand by blowing the sand with air or by processing the sand in a mineral separator. The sand can then be used in a borehole as a proppant and in fracking. The sand can be screened at any point in the process to separate the sand particles by grain size. The refined sand can be coated with a resin after the removal of pulverized impurities. |
