Paper Information

Title: 

FEASIBILITY STUDY ON LEACHING OF FIFTH ANOMALY OF SAGHAND AREA URANIUM AND RARE EARTH BEARING MINERALS, YAZD, IRAN

Type: PAPER
Author(s): VAKILI ABOUZAR,SAM A.,AKBARI MORTEZA
 
 
 
Name of Seminar: PROCEEDING OF IRANIAN MINING ENGINEERING CONFERENCE
Type of Seminar:  CONFERENCE
Sponsor:  IRANIAN SOCIETY OF MINING ENGINEERING
Date:  2005Volume 1
 
 
Abstract: 

Leaching is one of the common processes for the treatment of uranium and rare earth minerals. Considering mineralogy of the ore, leaching process consists of three methods, including: agitated atmospheric leaching (with both acid and carbonate as solvent), pressure leaching and roasting-digesting.
The ore under study was obtained from the fifth anomaly of saghand area located close to yazd city. The ore is constituted of different kinds of refractory minerals. Some of these minerals are as follow: Ilmenite, Rutile, Zircon, Sphene, Davidite, Bastnaesite and Monazite. Because of these refractory minerals in the ore, uranium and rare earth minerals dissolve with difficulty. In the present work, the ore was subjected to direct agitation atmospheric leaching (with acid and carbonate) and pressure leaching. For atmospheric leaching, experiments were done with digital agitator and water bath. While in pressure method, an autoclave was used for experiments. Highest recovery for uranium, as the most important element, in atmospheric method was 20%. Where, Cerium, Yttrium, Lanthanium recovery was 2.97%, 0.8% and 6.55%. These results were obtained under the conditions as follow: acid consumption was 500 kg/ton, oxidant concentration of 20 kg/ton, in the liquid to solid ratio of 2:1, time and temperature were 62 hour at 80°C. Almost complete and selective recovery of uranium was achieved in pressure leaching. While, the leaching extent of Yttrium, Cerium and Lanthanium were 36.51%, 6.2% and 0%. These results were achieved with the following conditions: concentration of solvent (which was carbonated) was 100 gram per liter of NaHCO3 and 50 gram per liter of Na2CO3, liquid to solid ratio was 6:1, the leaching experiment were done under 69 bar of pressure, time and temperature were one hour and 240°C, respectively.

 
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