Process for direct reduction of liquid high-lead skim with reduction furnace

Abstract

The invention discloses a process of directly reducing liquid high lead slag in reducing furnace, secondary lead-containing materials such as the liquid high lead slag, lead concentrate, scrap leads, waste accumulators and the like generated from the oxygen bottom blowing smelting furnace or zinc leaching residues are used as raw materials and are added from the top end of the reducing furnace; coal powder and natural gas used as fuel and oxygen-enriched air used as combustion improver are continuously led in from the top of the reducing furnace to carry out combustion reaction; the temperature in the reducing furnace is kept at 1000-1500 DEG C; the coal powder and natural gas can be simultaneously used as reducing agents and fall into the reaction tank at the bottom of the reducing furnace after being fully mixed with the raw materials; the lead oxides in the raw materials are reduced to crude lead and the addition of the reducing agents is subject to full reduction of the lead oxides in the raw materials. The process of the invention directly reduces the liquid high lead slag, fully utilizes the thermal energy of the high lead slag and further reduces the coke consumption and flue gas volume, thereby dramatically reducing the smoke dust rate and the smelting cost.

Description

technical field [0001] The invention relates to a process method for smelting lead in the nonferrous metal smelting industry. Background technique [0002] At present, the processes adopted in my country's crude lead production mainly include the traditional "sintering-blast furnace reduction" lead smelting process and direct lead smelting methods such as oxygen bottom blowing-blast furnace reduction lead smelting method, QSL method, ISA and Kaldo method. Due to the difficulty in recovering low-concentration sulfur dioxide flue gas produced in the traditional "sintering-blast furnace reduction" lead smelting process, limited by process conditions and equipment, SO 2 Unorganized emissions and lead dust pollution cannot be effectively controlled, and the country has banned the use of this process in 2000. In recent years, with the country's increasingly stringent environmental protection requirements, new lead smelting methods have been gradually popularized and applied in my...

AI Technical Summary

Problems solved by technology

Due to the difficulty in recovering low-concentration sulfur dioxide flue gas produced in the traditional "sintering-blast furnace reduction" lead smelting process, limited by process conditions and equipment, SO 2 Unorganized emissions and lead dust pollution cannot be effectively controlled, and the country has banned the production of this process in 2000

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