http://www.gsslweb.org/home/files/101-104amaraweera%20final.pdf

Here is the conclusion:

This study revealed that the impurities in Sri
Lankan vein graphite can be effectively
removed by treating with 5 - 20 vol. % HCl
solutions at 60 - 65 °C depending on initial
purity of different structural varieties. This
method uses mineral acids with low
concentrations at low temperature compared to
the previous methods (Zaghib, 2003; Jeongyun
and Byounggon, 2007). It is well known that
the electrochemical characteristics of anode
material are greatly degraded by the presence of
impurities. Therefore, this modified purification
method can be successfully used to enhance the
Sri Lankan vein graphite making them suitable
for the anode of lithium ion rechargeable
batteries.

We do not even need the acid treatment to get a better purity than they do. We are a lock for the Li ION batteries here and that is what the news release yesterday supported in a big way!