Solvay Minerals, Inc.

Robert N Skogley

Vladimir M Zolotoochin

Kevin L Green

David R Delling

Francis M Coustry

A process for recovering alkali values from trona ore by partially dissolving trona in a first dissolving solution to form a first feed liquor and undissolved trona. The first feed liquor is cooled and sodium carbonate decahydrate is precipitated. The sodium carbonate decahydrate is recovered from the resultant first mother liquor that is returned as the first dissolving solution. The undissolved trona is further dissolved in a second dissolving solution to form a second feed liquor. The second feed liquor is preferably carbonated to convert sodium carbonate into sodium bicarbonate, and cooled to precipitate sodium bicarbonate. The sodium bicarbonate is recovered from the resultant second mother liquor that is returned as the second dissolving solution.

Method for recovery of alkali values from trona using two-stage leaching

A method for treating mine water from an underground trona ore mine comprising pumping the mine water from the mine, introducing caustic soda into the mine water, maintaining the pH of the treated mine water to between about 11.5 and about 14, separating the treated mine water and introducing the treated mine water into an alkali production process.

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Green River, WY, United States of America

Robert N Skogley