Recovery of alkali values from trona deposits
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United States of America Patent
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Aug 17, 1982
Issued Date -
N/A
app pub date -
Dec 15, 1980
filing date -
Jan 21, 1980
priority date (Note) -
Expired
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Abstract
A cyclic method for recovering alkali values from subterranean trona deposits. The ore is contacted via solution mining with an aqueous mining solvent containing sodium hydroxide, the resulting Na.sub.2 CO.sub.3 -containing solution is withdrawn and carbonated, and sodium sesquicarbonate and/or sodium bicarbonate is crystallized and separated from the solution. The crystallized solids are calcined in a direct coal-fired calciner, and the resultant anhydrous soda ash is recrystallized in water to form sodium carbonate monohydrate or anhydrous sodium carbonate, which is recovered as a dense alkali product. Aqueous mining solvent is regenerated by causticization of one or more of the various liquor streams, and the recovery cycle is repeated.
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