DEVELOPING A TECHNOLOGY TO PREPARE SECONDARY LEAD RAW MATERIAL FOR ELECTROSMELTING

摘要

Today, prior to being smelted, fine-grained secondary lead raw material is sintered in sintering units with air being drawn upwards. The fuel is the organic part of battery scrap - 2.5 mm in size [1]. This technology is characterized by a number of problems: discharges - to the atmosphere - of toxic compounds of lead and organic substances which form after pyrolysis of the battery plastic which remains in the raw material following separation; the impossibility of using fine purification for the gases because the dust-collection system clogs up by mixtures of dust and readily combustible resinous organic matter; the comparatively low strength of the sintered product, leading high dust entrainment when a charge is sintered, transported, and smelted. There is practical interest in preparing lead raw material, in particular, the oxide-sulfate part of the battery scrap for smelting by pelletization, which avoids the limitations of the current technology [2]. Tests were conducted on a pilot unit in the VNIIT svetmet experimental lead plant (see Figure).