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US Patent 4344650 - Recovery of alkali values from trona deposits
US Patent Issued on August 17, 1982
Estimated Patent Expiration Date:
December 15, 2000Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
Estimated Patent Expiration Date:
December 15, 2000Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.AbstractA 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mining with an aqueous mining solvent containing sodium hydroxide, the resulting Na2 CO3 -containing solution is withdrawn and carbonated, and sodium sesquicarbonate and/or sodium bicarbonate is crystallized and separated from the solution.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. | InventorsAssigneeApplicationNo. 06/216096 filed on 12/15/1980US Classes:299/4, Input and output wells423/206.2Alkali carbonate from tronaField of Search299/4Input and output wellsExaminersPrimary: Purser, Ernest R.Attorney, Agent or FirmUS Patent References3119655, 3184287, 3498744, 3780160, 3953073, Process for the solution mining of subterranean sodium bicarbonate bearing ore bodiesIssued on: 04/27/1976 Inventor: Kube4039618, Treatment of sodium carbonate crystallizer mother liquors Issued on: 08/02/1977 Inventor: Gancy , et al.4285915, Recovery of alkali values from trona ore Issued on: 08/25/1981 Inventor: Saldick , et al.4288419Enhanced recovery of sodium carbonate from NaCl-containing sodium carbonate solutions Issued on: 09/08/1981 Inventor: Copenhafer , et al. International ClassesE21B 43/40 (20060101)E21B 43/00 (20060101) E21B 43/34 (20060101) E21B 43/28 (20060101) C22B 3/14 (20060101) C22B 3/00 (20060101) |
