RE: shale mica vanadium extraction2 Dec 2018 13:23
2/3
A 'PAL process requires large capital investment, which limits its industrial applications. Therefore, the sulfuric acid baking– leaching (SABL) process was proposed to extract vanadium from shale,14 which has advantages of high extraction efficiency, short processing times and no fluoride addition.’
A ‘The shale used here was obtained from Teng-da Mining’ ‘China. The chemical composition of the shale as determined’ ‘from the x-ray diffraction’ ‘were quartz, muscovite, pyrite, and calcite. The chemical phases of the vanadium in the shale were analyzed’ ‘The results showed that 88.11%, 10.03% and 1.86% of the total vanadium existed in silicate minerals, organic matter, and free oxide, respectively.’
This shows that the vast majority of the Vanadium in the mica in the sample used in the article was successfully extracted. Aura have said about 40% of the Haggan samples investigated were mica minerals (https://www.vanadisbm.com/project) and that the mica is where the vanadium is contained.
A ‘Anhydrite peaks were observed in Fig. 2a after baking with a sulfuric acid dosage of 15 wt.% while the calcite peaks completely disappeared, indicating that calcite can be easily converted into anhydrite in the presence of a small amount of sulfuric acid. In this case, only 13.6% vanadium leaching efficiency was obtained as the sulfuric acid reacted primarily with calcite in the shale and very little vanadium occurred in calcite phase’
RNS ‘ Evaluation of beneficiation by flotation of mica minerals and rejection of calcite at ALS Laboratories, Burnie Tasmania. This work demonstrated best preliminary results of 83% of vanadium could be recovered to 64% of total mass, resulting in a beneficiation factor of 1.3 times (sample: DDH022). Additionally, rejection of 80% of calcite was achieved in this preliminary work (sample: DDH022). This calcite rejection will reduce acid consumption and operating costs.’
AIMO ATB