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Title: In situ carbonate leaching and recovery of uranium from ore deposits

Abstract

Uranium is leached from redox roll ore deposits by selective in-situ leaching with a solution of pH 7.4 to 9 (preferably 7.5 to 8.5) containing from about 0.5 to 5g/l of NH/sub 4/HCO/sub 3/ and from about 0.1 to 3g/l of peroxide (preferably aqueous H/sub 2/O/sub 2/), and sufficient NH/sub 3/ to maintain the desired pH. The leach solution is then withdrawn from the ore deposit and contacted with a strong base anion exchange material to strip the uranium from the leach solution. The uranium is eluted from the anion exchange material by an aqueous eluant, and the uranium is recovered from the eluate by first acidifying it and then treating it with ammonia to produce a precipitate of relatively pure ammonium diuranate. The content of the three components in the stripped leach solution is adjusted, and then the leach solution is recirculated through the ore deposit. After the uranium ore is removed to the extent economically practicable, the leach solution is replaced with an aqueous reducing solution which when passed into the ore deposit precipitates and renders insoluble any uranium and elements such as vanadium, molybdenum, and selenium. This process produces above ground a very low volume of impuritiesmore » and waste solutions requiring disposal and does not cause material contamination of the underground deposit or any aquifer associated with the deposit.« less

Inventors:
; ;
Publication Date:
OSTI Identifier:
5692541
Patent Number(s):
US 4155982
Application Number:
TRN: 80-000548
Assignee:
Wyoming Mineral Corp.
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 9 Oct 1974
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; URANIUM ORES; SOLUTION MINING; AMMONIA; AMMONIUM COMPOUNDS; AMMONIUM URANATES; CARBONATES; ION EXCHANGE; LEACHING; PEROXIDES; ACTINIDE COMPOUNDS; CARBON COMPOUNDS; DISSOLUTION; HYDRIDES; HYDROGEN COMPOUNDS; MINING; NITROGEN COMPOUNDS; NITROGEN HYDRIDES; ORES; OXYGEN COMPOUNDS; SEPARATION PROCESSES; URANATES; URANIUM COMPOUNDS; 050400* - Nuclear Fuels- Feed Processing

Citation Formats

Hunkin, G G, Fife, T P, and Stano, J R. In situ carbonate leaching and recovery of uranium from ore deposits. United States: N. p., 1979. Web.
Hunkin, G G, Fife, T P, & Stano, J R. In situ carbonate leaching and recovery of uranium from ore deposits. United States.
Hunkin, G G, Fife, T P, and Stano, J R. Tue . "In situ carbonate leaching and recovery of uranium from ore deposits". United States.
@article{osti_5692541,
title = {In situ carbonate leaching and recovery of uranium from ore deposits},
author = {Hunkin, G G and Fife, T P and Stano, J R},
abstractNote = {Uranium is leached from redox roll ore deposits by selective in-situ leaching with a solution of pH 7.4 to 9 (preferably 7.5 to 8.5) containing from about 0.5 to 5g/l of NH/sub 4/HCO/sub 3/ and from about 0.1 to 3g/l of peroxide (preferably aqueous H/sub 2/O/sub 2/), and sufficient NH/sub 3/ to maintain the desired pH. The leach solution is then withdrawn from the ore deposit and contacted with a strong base anion exchange material to strip the uranium from the leach solution. The uranium is eluted from the anion exchange material by an aqueous eluant, and the uranium is recovered from the eluate by first acidifying it and then treating it with ammonia to produce a precipitate of relatively pure ammonium diuranate. The content of the three components in the stripped leach solution is adjusted, and then the leach solution is recirculated through the ore deposit. After the uranium ore is removed to the extent economically practicable, the leach solution is replaced with an aqueous reducing solution which when passed into the ore deposit precipitates and renders insoluble any uranium and elements such as vanadium, molybdenum, and selenium. This process produces above ground a very low volume of impurities and waste solutions requiring disposal and does not cause material contamination of the underground deposit or any aquifer associated with the deposit.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1979},
month = {5}
}