Harmless dressing and smelting method for recycling lead, zinc, carbon, iron and tailings from water quenching slag

Abstract

The invention belongs to the technical field of fire metallurgy and mineral processing, and discloses a harmless dressing and smelting method for recycling lead, zinc, carbon, iron and tailings from water quenching slag. The harmless dressing and smelting method is characterized in that a metallurgy process of high-temperature reducing (volatilizing) roasting and a mineral processing process of flotation and magnetic separation are adopted, and a rotary kiln is applied to perform the metallurgy process of high-temperature reducing (volatilizing) roasting to recycle components lead and zinc from the water quenching slag of a blast furnace; the kiln slag of the rotary kiln is grinded to certain thickness, and coke and iron minerals in the slag can be recycled through the mineral processing process of flotation and magnetic separation; and tailings with valuable constituents recycled mainly contain nonmetal minerals such as silicate, and can be used as ingredients for cement production for being sold, so that harmless treatment on the tailings is realized. While lead and zinc are volatilized and recycled, characteristics of slag are changed, so that beneficial conditions are providedfor subsequently recycling carbon and iron from kiln slag, and therefore, comprehensive recycling is realized; and the floated and recycled carbon can be taken as a reducing agent for being reused forreducing roasting of the water quenching slag of the blast furnace, so that production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of pyrometallurgy and mineral processing, and in particular relates to a harmless separation and smelting method for recovering lead, zinc, carbon, iron and tailing slag from water-quenched slag. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: [0003] Lead smelting in my country is generally dominated by pyrotechnics, which usually adopts the production process of sintering and roasting-blast furnace smelting, which accounts for about 85% of the lead production. The process is to sinter the lead-containing ore or lead concentrate Roasting to obtain lead agglomerates, and then sent to the blast furnace for reduction smelting to obtain crude lead. In the above-mentioned lead smelting process, approximately 0.9-1.0 tons of blast furnace water-quenched slag will be produced for every ton of crude lead produced. The slag contains zinc and other v...

AI Technical Summary

Problems solved by technology

[0006] (1) The purpose of comprehensive recovery of valuable metals in water-quenched slag cannot be achieved

In the prior art, regardless of the application of fire treatment, wet treatment, or material recovery to recover or dispose of water-quenched slag, it is impossible to comprehensively recover the valuable metal elements in water-quenched slag. For example, fire method only It can recover volatile metals such as lead and zinc in the slag; wet treatment can recover most of the metals in the slag, but the element iron in the slag is generally treated as a harmful metal element in the process of leachate treatment; material treatment only It simply disposes of the water-quenched slag, and does not recycle any metal elements in the slag

[0007] (2) Unable to change the slag properties

[0008] (3) High recycling cost

[0011] Signific...

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