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Paper Information

Title: 

INVESTIGATION ON THE EFFECTIVE PARAMETERS OF THE DIGESTING PROCESS OF URANIUM MINERALS OF SAGHAND AREA (ANOMALY5)

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

One of the effective processes for the dissolution of the minerals containing uranium especially the resistant minerals is the process of digesting. In this process, the minerals, after being splitted in to certain sizes in resistant dishes (for example those made of cast iron) are mixed with concentrated sulphuric acid (or base) and exposed to high temperature. The act of dissolution takes place exactly after the dilution of the mixture in water, using agitation leaching. (In fact, throughout the digesting process the resistant minerals, which mostly contain phosphate base, are transformed in to sulphate base which help them undergo leaching more comfortably.
In order to study the possibility of using the digesting processes and its usefulness in utilizing uranium and other rare earth elements, samples of Saghand Anomaly No.5 have been analyzed at the laboratory. These samples which contained minerals such as calcite, quartz, actinolite, bastnaesite, ilmenite, rutil, sphen, monazite, albite, chevkenide were first concentrated using the method of per-concentration (electrostatic, magnetic and gravitation) which leads to an increase in the rate of their heavy minerals from 10% to 50%. The purpose was to eliminate calcite and other obtrusive minerals and consequently have a better dissolution and a less consumption of acid. At this stage of dissolution, and by using the produced concentrate in the digesting process, the effect of different parameters such as temperature and time of digesting, concentration of sulphuric acid, the proportion of liquid to solid (L/S) at digesting stages and concentration of nitric acid (oxidant), with the aim of determining their optimum value, were studied which resulted in the following values for the above-mentioned parameters:
 temperature: 200oC, time: 2hr, concentration of sulphuric acid: 10.8M, L/S: 3/1, concentration of nitric acid 5.3M.Under this condition, maximum recovery of uranium was 85%.

 
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