Development Document for Effluent Limitations Guidelines
The general method in use is (1) coarse crushing in jaw or gyratory crushers, sometimes in two stages, to 3.8 to 5.1 cm (1-1/2 to 2 in); (2) drying to 1 percent or less moisture in rotary or vertical inclined-plane driers; (3) secondary crushing in short head cone crushers, gyratories, or hammer mills; (4) screening, usually in flat shaking or ...