Abstract:

The white carbon black was successfully prepared by using sodium silicate derived from oil shale ash via the traditional precipitation by hot-air drying. The effects of synthesis condition on the formation of white carbon black were also investigated. The results showed that the optimal synthesis conditions of white carbon black are as follows: SiO₂ concentration of 8.1%, sulfuric acid concentration of 1.5 mol/L, aging time of 8 h, reaction temperature of 70-80℃, and pH value of 8. The transmission electron microscopy (TEM) images indicated that the white carbon black has an average diameter of about 50 nm. In addition, it was observed that limited amount of particles were agglomerated.

Key words: oil shale ash, white carbon black, hot-air drying