MINERAL MATTER REMOVAL FROM ANTHRACITE BY HIGH-TEMPERATURE CHLORINATION

Mineral matter was removed from anthracite by heating in 0.1 MPa Cl-2 at 600-1400 degrees C. The mineral matter undergoes carbothermic reduc tion, followed by chlorination of metals to volatile chlorides. Remova l of mineral matter increases the porosity of the coal and enhances th e accessibility of additional mineral matter to Cl-2. Exposure to Cl-2 results in the fixation of chlorine on the anthracite, thereby affect ing the electrical resistivity of the resulting carbon.