Acid leaching of amang for eventual recovery of titanium under diffusion limited system
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Date
2017-06
Authors
Mohamad Amir Syafiq Bin Mansor
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Abstract
Leaching process of ‘Amang’ was carried out by using hydrochloric acid and sulfuric
acid as leaching agent without any presence of catalyst. Leaching were tested at the
worst condition where no agitation included in the whole process and kinetics was
studied under diffusion limited system. Amang was characterized using a few
techniques including PSD, XRF, XRD, LOI and SEM. XRF analysis shows that some
elements presents in amang give a high percentage by weight including TiO2 (34%),
Al2O3 (15%), SiO2 (18%), Fe2O3 (15%) and ZrO2 (8%). From XRD, major peak shown
indicates the existence of major mineral bearing the titanium metal that is rutile and
ilmenite. SEM of polished section proves that titanium bearing mineral was already
liberated from other elements excepts for iron so it can be leached directly. The leaching
was conducted by manipulating different parameters such as acid concentration, solid to
liquid ratio and temperature. The novelty of the experiment is to test one factor at a
time. At room temperature, two parameters were tested by using different concentration
of sulfuric acid and different volume of acid to leach 10g of amang. 4M of acid
concentration give higher weight loss of 1.25% after 4 hours of leaching. Meanwhile,
ratio of 1:7 gives the highest weight loss of 0.56% when leached using 2M of sulfuric
acid for 4 hours. Varying the temperatures, 80 oC of 2M sulfuric acid give highest
weight loss of 3.18% after 4 hours of leaching. Testing the residue of amang after
sample using XRF give the same amount of element in weight percent as raw sample.
XRD analysis of leached residue shows that ilmenite has been leached because only
TiO2 can be detected in two different phases of rutile and brookite.