Heap Leaching Studies on Uranium Ore. Phase V: Experimental Studies.
Merritt-RC; Peterson-H; Wentz-CN; Harris-M
NTIS: PB 293-578 :221 pages
Experimental studies were conducted on a low-grade ore procured from Wyoming. The ore was characterized as primarily sandstone with a trace of clay mineralization and had a u3o8 content of 0.029 pct. The studies showed that acid leaching by agitation and by 2-in column percolation gave 97 and 99 pct u3o8 extraction and that the ore was less responsive to carbonate leaching than to acid leaching. Tests using a sodium carbonate lixiviant gave 69 and 82 pct u3o8 extraction for the agitation and percolation studies. Tests using an ammonium carbonate lixiviant gave 39 and 83 pct u3o8 extraction for the agitation and percolation studies. Subsequent pilot plant studies consisted of nine percolation leach tests conducted in 2-ft- diam columns, and one small-scale heap leach. These studies showed that the percolation tests using an acid lixiviant resulted in greater than 96 pct u3o8 extraction, whereas the percolation tests using carbonate lixiviants resulted in 87 pct u3o8 extraction. The pilot plant studies using acid solution showed that the rate of u3o8 extraction was directly proportional to the flow rate.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB 293-578
Colorado School of Mines Research I