Screw conveyor battery recycling and bucket elevator recycling plant applications present unique engineering challenges: materials range from fine lead paste (bulk density 2.5-3.5 t/m³) to coarse plastic fragments (bulk density 0.4-0.6 t/m³), sulfuric acid contamination attacks conventional materials within months, lead oxide dust requires sealed construction preventing atmospheric release, and elevation changes of 5-15 meters are common in multi-level processing