T/CI 033-2022 Active

Main Technical Content: 3.1 Zinc Smelting Leach Residue During the wet zinc smelting process, zinc roasted ores or zinc oxide ores are subjected to low-temperature and low-acid or high-temperature and high-acid leaching, or direct leaching of zinc sulfide concentrates, or leaching of zinc oxide fumes. This results in a mixture of zinc sulfate solution and insoluble residues. After solid-liquid separation, the solid residues are zinc smelting leach residue. Zinc smelting leach residue includes: - Leach residue from conventional leaching of zinc roasted ores or zinc oxide ores during wet zinc smelting - Ferric ammonium sulfate residue and lead-silver residue from hot acid leaching of zinc roasted ores using the yellow ferric ammonium sulfate method - Magnetite residue and lead-silver residue from hot acid leaching of zinc roasted ores using the needle iron method - Sulfide residue and flotation tailings from oxygen leaching of zinc sulfide concentrates under atmospheric or pressurized conditions - Zinc oxide leach residue from zinc oxide leaching processing 3.2 Recycling The reuse of zinc smelting leach residue as a raw material, or its mixture with other solid waste or concentrates, for extracting valuable elements. Zinc smelting leach residue recycling processes include pyrometallurgical recovery (treating zinc smelting leach residue at high temperatures in metallurgical furnaces to recover valuable elements) and hydrometallurgical recovery (using strong acids, alkalis, or other solvents to leach valuable elements from zinc smelting leach residue and then separating and recovering them). 3.3 Pyrometallurgical Recovery A process that uses metallurgical furnaces to treat zinc smelting leach residue at high temperatures to recover valuable elements. Zinc smelting leach residue pyrometallurgical recovery processes include: - Rotary kiln method for directly processing zinc smelting leach residue - Oxygen-enriched top-blowing furnace meth