So 2 internally-heated screw dryers were added before the disk dryers for predrying pyrite concentrate and appropriate improvements of disk dryers were conducted for less failure and easer maintenance.
为此,在盘式干燥机前增加2台内加热双螺旋干燥机进行预干燥,并对盘式干燥机进行相应的改造,以减少故障、便于维修。