Method for separating zinc-containing substance of blast furnace dry method dust separation ash

Abstract

The invention discloses a method for separating zinc contained material from blast furnace gas dry precipitator dust, and the pretreatment for the blast furnace gas dry precipitator dust achieves the purpose of reducing dezincing load at the terminal of the blast furnace gas dry precipitator dust. The key points are that the blast furnace gas dry precipitator dust is absorbed into the main machine of an air classifier through negative pressure with a vacuum degree of 0.4 to 0.6 kgf / cm<2> which is produced by a Roots blower. Self shunt can be realized in a gravity field, most of thick grains deposit on the bottom part of the classifier, the rotating speed of the classified wheel of the classifier main machine can be adjusted within a scope of 2000 rpm to 9000 rpm, the supply air volume is also adjusted, a secondary assorted cut is performed on the fine grained precipitator dust, and a high zinc contained precipitator dust accounting for 10 to 30 percent of the inlet amount can be cut out, and the high zinc contained precipitator dust can be packed by a packaging machine for other treatment after being collected. The invention can be used for recycling low zinc ash of which low zinc ash is no less than 75 percent and the total content of zinc is less than 1 percent, and is applicable to pretreatment for dezincification of the blast furnace gas dry precipitator dust, and zinc accumulation during the reusing process of high zinc contained precipitator dust is reduced.

Description

technical field [0001] The invention relates to a method for treating solid waste resources, which is suitable for separating zinc-containing substances from blast furnace dry dedusting ash produced in the iron and steel metallurgical industry, and solves the problem that the recycling of high zinc-containing dedusting ash affects the smooth operation of the blast furnace. Background technique [0002] The enrichment of zinc in blast furnace production exists in two cycles. The first cycle is a small cycle inside the blast furnace, and the second cycle is sintering—a large cycle between blast furnace production links. The small cycle refers to the complex compound of zinc in the blast furnace raw material being reduced to metal zinc by carbon monoxide in the high temperature area above 1000°C, and then oxidized to zinc oxide when the gas flow rises to a lower temperature area, and a part of it is attached to the falling furnace charge again. Entering the high temperature zon...

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Problems solved by technology

[0005] The present invention overcomes the problems of complex equipment system, difficult operation, and post-processing requirements for products in the wet process, and provides a method for the separation and enrichment of zinc-containing substances with small investment and stable process for dry dust removal of blast furnaces. The blast furnace dry dedusting ash is directly subjected to the separation and enrichment of zinc elements, reducing the terminal dezincification treatment capacity of high zinc ash

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