Overall treatment method of steel works sintering dust

Abstract

The invention relates to an overall treatment method of steel works sintering dust, which is characterized by comprising the following steps: carrying out stage treatment on electrically precipitated dust in a sintering head, conveying the electrically precipitated dust produced in a primary electric field directly to a sintering field (a stock yard or a material distribution room) for material application in case of sintering; mixing the electrically precipitated dust produced in a subsequent electric field and then carrying out stirring pulping, gradient magnetic separation, carbon selection by flotation and solid-liquid separation; when the solid-liquid separation is finished, using the obtained potassium solution for producing potassic fertilizer and extracting lead product from the obtained tailing slurry.The method of the invention has the advantages that different process routes are adopted to effectively recover and comprehensively utilize contained multiple valuable resourcessuch as ferrum, carbon, potassium, lead and the like according to different contents of alkali metal such as potassium and sodium and heavy metal compounds such as lead, zinc and copper in different electric field precipitated dust in a sintering head electric precipitator.

Description

field of invention [0001] The invention relates to a method for comprehensive utilization of ash resources of electric dust collectors for sintering head flue gas in iron and steel plants, and belongs to the solid waste treatment technology of iron and steel metallurgical enterprises. Background technique [0002] Iron ore sintering is an important link in steel production. Sinter ash is the abbreviation and common name of sintering head flue gas electrostatic precipitator ash. It is the dust collected by the sintering head flue gas electrostatic precipitator during the iron ore sintering process. Its output accounts for about 1% to 2% of the sintered ore output, and the annual sintered ash produced in China is as high as 10 million tons. [0003] The sintering head electrostatic precipitator usually consists of 3 to 5 electric fields. When the dust in the flue gas passes through the electrostatic precipitator, it is not only affected by the force of the electric field but...

AI Technical Summary

Problems solved by technology

A high content of alkali metal element compounds will increase the resistance of sintered dust particles with a submicron particle size structure, which will lead to a decrease in the collection and dust removal efficiency of the sintering head electrostatic precipitator and a deterioration of the operational stability of the dust removal device, which eventually manifests as sintering The concentration of smoke and dust emitted by the electrostatic precipitator at the machine head exceeds the standard and the operating energy consumption of the dust removal device increases

[0008] (2) The sintered ash is directly added to the iron ore as the blast furnace charge, and the heavy metal elements such as lead, zinc, and copper contained in it will enter the ironmaking blast furnace with the iron ore and be enriched in the furnace cycle, seriously affecting the normal production of the blast furnace : Nodules in the blast furnace, resulting in shutdown of the blast furnace for overhaul and equipment safety hazards; reducing the strength of the blast furnace charge, resulting in fluctuations in the blast furnace condition and unstable production; blocking the blast furnace gas dust removal system pipeline, affecting the flexibility of the gas shut-off valve Sexuality, causing difficulty in blast furnace ignition

[0009] Therefore, the method of directly recycling sintered ash cannot completely solve the problem of efficient recycling of sintered ash

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