Direct lead smelting method for processing zinc smelting slag by matching

Abstract

The invention discloses a direct lead smelting method for processing zinc smelting slag by matching. The method comprises the following steps of: drying zinc smelting slag at the first stage; batching the zinc smelting slag together with raw materials and solvents containing lead to obtain a lead-containing furnace charge with stable components; drying at the second stage and then ball milling; uniformly mixing the furnace charge with reducing agent coke and smelting return dust respectively according to preset measurements, and continuously adding the obtained mixed powder from an oxygen nozzle so as to ensure that the mixed powder enters a lead smelting furnace together with pure oxygen to carry out flash smelting and respectively obtain crude lead and secondary zinc oxide; sending slaginto a fuming furnace for blowing or water quenching; and sending gas fume containing sulphur into a sulfuric acid system. The lead smelting method has short technological process and strong raw material adaptability and can smelt low-grade furnace charges containing more than 25 percent of Pb, and meanwhile, a large amount of the zinc smelting slag can be processed by matching. The lead smeltingmethod can produce all crude lead in a metallurgical furnace, and the content of lead in the slag can be controlled to be below 3.5 percent without adopting a blast furnace or other devices to carry out high lead slag reduction. The lead smelting method belongs to true lead smelting or one-step lead smelting.

Description

technical field [0001] The invention relates to a method for directly smelting lead and simultaneously processing zinc smelting slag. Background technique [0002] Lead smelting At present, most of the world's mineral crude lead is produced by the traditional sintering-blast furnace reduction smelting process. This process has been used for a long time and has been continuously improved and improved. It has the characteristics of maturity and reliability, complete process, and good technical and economic indicators. However, the sintering process needs to deal with a large amount of returned powder, which will lengthen the process and cause dust to escape; sintering flue gas SO 2 The concentration is low, so it is difficult to adopt the two-turn and two-suction acid production process; the heat generated by the oxidation of sulfide in the sintering process is difficult to effectively use; the blast furnace smelting needs to add expensive metallurgical coke, the energy consum...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of the traditional lead smelting method, and to overcome the defects of the zinc smelting slag processing process alone, so that the zinc smelting slag can be processed in combination with the direct smelting of lead, the present invention provides a method for coordinating the zinc smelting slag. direct lead smelting method

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