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Method of beneficiating and drying trona ore useful for flue gas desulfurization

  • US 9,327,233 B2
  • Filed: 02/11/2011
  • Issued: 05/03/2016
  • Est. Priority Date: 09/14/2010
  • Status: Active Grant
First Claim
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1. A method of producing trona suitable for dry injection pollution control comprisingmechanically mining a trona ore deposit containing at least about 5 wt % insoluble impurities;

  • crushing the mined trona ore to create a mixture of uncalcined trona ore particles comprising trona-rich particles and impurities-rich particles;

    beneficiating the crushed uncalcined trona ore, via a dry separation procedure selected to recover trona-rich particles larger than about ¼

    inch in size, wherein the dry separation procedure is selected from the group consisting of density separation, magnetic separation, electrostatic separation, optical separation, x-ray imaging separation, infrared imaging separation and combinations of these, without prior drying of the unbeneficiated ore and the trona-rich particles larger than about ¼

    inch in size, to obtain a trona-rich, impurities-depleted ore fraction; and

    then drying the trona-rich impurities-depleted ore fraction under non-calcining conditions to yield a dry uncalcined trona ore containing less than about 0.1 wt % free moisture.

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