A method for collecting zinc powder in metallurgical ash

Abstract

The invention provides a method for collecting zinc powder in metallurgical ash, comprising steps: S1. Open the nitrogen tank to blow nitrogen from the bottom of the fluidized fluidized furnace, and then add metallurgical ash to the preheated fluidized fluidized furnace, so that the zinc oxide in the metallurgical ash is oxidized and reduced Reaction to obtain zinc vapor; S2. The obtained zinc vapor enters the condenser through the cyclone separator, and condenses to obtain zinc powder and condensed waste gas; S3. The condensed zinc powder enters the powder collector, and the condensed waste gas is accelerated through the exhaust fan. It enters from the bottom of the boiling furnace through the air duct and is recycled. The entire collection system adopts a circulating zinc powder collection system. The gas volatiles enter the two-stage series condenser through the cyclone separator to condense. The condensed waste gas is drawn out by the exhaust fan and enters the boiling furnace for recycling. When a certain pressure value is reached, the condensed waste gas is discharged into the waste gas. The collection tank can not only save costs, but also reduce the pollution of the exhaust gas to the atmospheric environment.

Description

technical field [0001] The invention relates to the technical field of metallurgical solid waste recycling, in particular to a method for collecting zinc powder in metallurgical ash. Background technique [0002] In the blast furnace ironmaking process, impurities contained in iron ore, such as lead and zinc, are reduced, and steam is formed at high temperature, and together with the fine dust of ore, coke, flux, etc., is taken out of the furnace with the blast furnace gas, and the kot The dry fine-grained dust obtained by the external dust collector is metallurgical ash, which is mainly composed of iron, carbon and oxides of Si, Al, Ca, Mg, and contains low boiling point Pb, Zn oxides with alkali metal oxides. In recent years, my country's iron and steel production has been huge. Every ton of steel produced will produce about 10-15kg of metallurgical ash. According to the composition of blast furnace raw materials, the content of zinc in metallurgical ash is 0.5-10%. If co...

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Problems solved by technology

In recent years, my country's iron and steel output is huge. Every ton of steel produced will produce about 10-15kg of metallurgical ash. According to the different components of blast furnace raw materials, the content of zinc in metallurgical ash is 0.5-10%. If comprehensive recycling is not implemented , not only causing environmental pollution, but also a waste of resources

[0003] At present, the method of recovering metal zinc in metallurgical ash is mainly collected by pyro-enrichment or wet leaching. Zinc is reduced to zinc vapor and volatilized, and after secondary oxidation in the flue, it is enriched in the form of zinc oxide in the collector. The zinc recovery rate of pyroprocessing metallurgical ash is as high as 85%, but the equipment investment is large and the energy consumption is high. ;Wet leaching is to use the characteristics of zinc oxide to be soluble in acid and alkali, and use acid and alkali solution as the leaching solution to recover zinc oxide from dust. Serious, so the treatment of zinc-containing dust is mainly based on pyroenrichment

[0004] However, since zinc vapor is easily oxidized in the process of volatilization and condensation, most of the zinc collected by pyro-enrichment exists in the form of zinc oxide. It is difficult to directly condense and collect zinc powder, and there are few related methods.

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