Dewatering mechanism of gasification fine slag by coupled mechanical force fields and its potential guidance for efficient dewatering process

Abstract Gasification fine slag is one of the industrial wastes of the coal gasification, and the efficient dewatering is indispensable for further dispose. The enhanced dewatering process of gasification fine slag was achieved by innovative coupled mechanical dewatering force fields and dewatering mechanisms were explained in this study. The results showed that the dewatering process under pressure presented a three-stage process, the filtration and compaction stages of the dewatering process were accelerated at higher pressures. Vibration field improved the dewatering process linearly by filling the gaps among particles and accelerating particle compaction. Synergistic action of pressure and vibration frequency on dewatering was confirmed. The dewatering promotion effect of vibration frequency was obvious at high pressure. In dewatering process, the energy consumption of coupled mechanical dewatering is only 37.4% of that of evaporation dewatering, which presents the advantage of coupled mechanical dewatering process in energy consumption. In this paper, 13% moisture reduction of sample within 3 min via coupled mechanical dewatering force fields was studied, which will provide references for deep dewatering process and cleaner production of gasification fine slag in industry.