Overall treatment method of steel works sintering dust

A technology for comprehensive treatment and sintering of ash, applied in fertilizer mixtures, iron oxide/iron hydroxide, applications, etc., can solve the problems of increased operating energy consumption of dust removal devices, difficulty in blast furnace ignition, hidden dangers of blast furnace equipment safety accidents, etc. The effect of equipment investment and raw material consumption, optimization of recycling routes, and minimization of recycling costs

Active Publication Date: 2010-06-09
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Overall treatment method of steel works sintering dust
  • Overall treatment method of steel works sintering dust
  • Overall treatment method of steel works sintering dust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take the sintering head electrostatic precipitator 2 # ~4 # Electric field dust removal mixed ash 200Kg, its chemical composition analysis is shown in Table 2:

[0032] Table 2 Example 1 in 2 # ~4 # Chemical composition of electric field dust removal mixed ash

[0033]

[0034] Add 2000L of industrial water at a solid-to-liquid ratio of 1:10, add 1.0kg of industrial sulfuric acid and 0.5kg of sodium dodecylbenzenesulfonate as a dispersant, and stir for a certain period of time to obtain a sintered ash suspension. The obtained suspension slurry is combined with magnetic separation (weak magnetic strength 800T, strong magnetic strength 1600T) through "weak magnetic → strong magnetic" to obtain iron concentrate and primary tailing slurry. Coke powder and secondary tailings are obtained from the primary tailings through "flotation charcoal separation", and the iron concentrate and coke powder are reused as sintering ingredients. After the secondary tailings are cent...

Embodiment 2

[0042] take 2 # ~4 # The electric field sintering head ESP mixed ash is 400Kg, and its chemical composition analysis is shown in Table 5.

[0043] Table 5 Example 2 in 2 # ~4 # Chemical Composition of ESP Mixed Ash in Electric Field Sintering Machine Head

[0044]

[0045] Add 4000L of industrial water at a solid / liquid ratio of 1:10, add 5.0kg of industrial sulfuric acid and 0.80kg of dodecyltrimethylammonium bromide (chloride) as a dispersant, and stir for a certain period of time to obtain a sintered ash suspension , the resulting suspension slurry is subjected to "weak magnetic → strong magnetic" combined magnetic separation (weak magnetic strength 800T, strong magnetic strength 1600T) to obtain iron concentrate and primary tailings, and the primary tailings are subjected to "flotation carbon separation" to obtain coke powder and The secondary tailings, iron ore concentrate and coke powder are reused in the sintering batching process. After the secondary tailings s...

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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 resources such 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...

Claims

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Application Information

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IPC IPC(8): C05D1/00C05D1/02C01G21/06C01G21/16C05G1/00C01G49/02C01F11/18C01F5/24C22B13/00C22B15/00
CPCY02P10/20
Inventor 刘宪杨运泉
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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