Abstract: The raw material was sodium silicate prepared by using coal gangue， and the white carbon black with high specific surface area was prepared by carbonation process.The effect of carbonation process conditions on the BET specific surface area and DBP absorption value of white carbon black were investigated.The conclusions showed that，the conditions of carbonation process were：the density of sodium silicate solution was 1.074 5 g/mL，CO2 flow rate was 80 mL/min，reaction temperature was 80 ℃，and drying at ambient pressure after ethanol soaking for 10 h.The specific surface area of 279.74 m2/g，DBP absorp- tion of 2.93 mL/g，and well dispersive of white carbon black particles were successfully prepared under these conditions.

Key words: sodium silicate, carbonation, white carbon black, specific surface area