Because........... if the impurities are not intercalated in the the graphite particles then one can grind and use flotation to one's heart content until one gets the purity level up to such high levels. That is what happens during micronisation and additional flotation to graphite particles that do not have intercalated impurities.
All well and good for making headlines, but it all comes down to the economies of scale matched to the practical need and compared in return for investment values or in other words...... profit margin. Additionally, what can be done in the lab has to be proven capable when scaled up to commercial levels. That is where the dollar costs start mounting. Until announcements state the bottom line in comparative dollar values then one should be very wary about getting over excited about such announcements. Just another angle to help 'sell the story'.
