QUEBEC – Canada Carbon successfully upgraded graphite from its Miller property to 99.9978% purity using a rapid thermal upgrading process. The Vancouver-based company is the 100% owner of the property 80 km west of Montreal.
A sample of the Miller vein graphite was subjected to a two stage caustic roast/acid leaching process, by SGS Canada and was then submitted to Evans Analytical Group, of Liverpool, NY, for full chemical analysis. The sample was analyzed both as received, and also subsequent to rapid high temperature heat treatment in an inert atmosphere, to provide comparison of the total contaminants before and after heat treatment. Total measured elemental impurities before heat treatment were greater than 246 ppm by weight. Total measured impurities after heat treatment were less than 23 ppm. Thus, more than 90% of the contaminants were removed from this graphite by rapid thermal upgrading.
Canada Carbon noted that industry standard assay methods used by graphite exploration companies are unable to determine graphite purity beyond 99.9%. The techniques used here make possible a much more precise measurement of overall purity.
The Miller mine is a past graphite producer, worked in the mid-1800s. The mineralization consists of two massive veins (70 to 90% visual graphite) varying in thickness from 4 to 15 cm in a graphitic marble unit.
Further details are available at CanadaCarbon.com.