Recovery of alkali values from trona deposits

Details Recovery of alkali values from trona deposits Recovery of alkali values from trona deposits

1980-12-15

1982-08-17

Purser, Ernest R.

Mining or in situ disintegration of hard material

In situ conversion of solid to fluid

Input and output wells

423206T, E21B 4328

Patent

active

043446507

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with an aqueous mining solvent containing sodium hydroxide, the resulting Na.sub.2 CO.sub.3 -containing solution is withdrawn and carbonated, and sodium sesquicarbonate and/or sodium bicarbonate is crystallized and separated from the solution.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.

REFERENCES:
patent: 3119655 (1964-01-01), Frint et al.
patent: 3184287 (1965-05-01), Gancy
patent: 3498744 (1970-03-01), Frint et al.
patent: 3780160 (1973-12-01), Waggener et al.
patent: 3953073 (1976-04-01), Kube
patent: 4039618 (1977-08-01), Gancy et al.
patent: 4285915 (1981-08-01), Saldick et al.
patent: 4288419 (1981-09-01), Copenhafer et al.

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