Progress of steam coal clean and efficient jigging technology in China

Abstract

Under the conditions of a two stage fixed-sieve jig rejecting refuse simultaneously in the steam coal separation process, the variation in low quality coal feeding (raw coal ash fluctuating range from 30% to 55%) leads to considerable fluctuations of washing clean coal (-1.8kg/L) ash, which affects jigging separation performance seriously. To solve this problem, the correlation between Automatic Tracking Ash Closed-loop Control and the five control factors (jig, air, water, feeding and discharge) is analyzed in this paper, and then the viewpoint that jigging separation performance depends on stratification performance and automatic tracking secondary optimal cut point is proposed. In order to put this new technology into practice, on-line identification technology is applied to measure the ash distribution of washing clean coal. According to it, an appropriate control method is selected and the cleaned coal ash index interval is amended for systematic adjustment. In this way, the contradiction among the washing clean coal ash variation, efficiency and quality of cleaned coal products is harmonized and clean, efficient steam coal jigging is performed.