DEVELOPMENT AND INDUSTRIAL APPLICATION OF AN IMPROVED LEAD OXYGEN-ENRICHED FLASH SMELTING PROCESS

摘要

Lead oxygen-enriched flash smelting process (LOFS), an improved direct lead smelting process, has been developed and applied in a 100,000 tons-lead bullion per annum smelter. This study first described the main equipment (LOFS flash smelting furnace) and the technological process, and then discussed the operation in the smelter, together with the actual material flow. During the description of the LOFS furnace, a center-to-periphery charge lance and cooling components were mainly discussed. According to the operation in the smelter, lead-bearing materials containing 20 - 60% Pb could be treated by this technology, and the recovery of Pb, Zn, Cu and S were 99%, 91%, 86% and 98%, respectively. The fume was only 60-100 Kg/t-charge, and the lead content in the final slag was 1.0%. Material flow analysis showed that 89.7% lead bullion was from the flash smelting stage, the average lead content in lead bullion was 98.6% and the direct yield of lead in metal was 93.3%.