Acidic medium was effective for decreasing the high amount of sulfur ratio of Can lignite. The most effective medium was H2O2 + HCl solution. With this treatment sulfur ratio was removed by the order of 36%, and HF was also effective for decreasing sulfur from 3.8 to 2.83% of giving 26% yield. These treatments were also effective for decreasing mineral parts of Can lignite. The highest ash reduction was accomplished with H2O2 + HF solution which was given approximately 48% demineralization yield. HF could react almost with every minerals especially siliceous ones in the mineral matter.
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