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A method for recovering iron from 3-4 electric field dedusting ash of sintering head

A four-electric-field, iron-recycling technology, applied in chemical instruments and methods, wet separation, solid separation, etc., can solve problems such as insignificant and non-effective effects, achieve considerable economic benefits, simple technological process, and is suitable for promotion and popularization Effect

Active Publication Date: 2020-02-21
苏州固利环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this patent is that it is only suitable for processing machine head ash with high iron content, and the effect is not obvious when the iron content is low, and this patent is not specifically aimed at the method of recovering iron

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1, a method for reclaiming iron from sintering head three or four electric field dust removal, comprising the following steps:

[0021] 1) Slurry mixing: add dust from the three or four electric fields of the machine head into the mixing tank, add water at the same time, control the total liquid-solid ratio at 1.3, control the stirring speed at 120 rpm, and at the same time pass compressed air and Steam to obtain a uniformly dispersed slurry; specific liquid-solid ratio, specific rotational speed, and compressed air to make the slurry more uniform;

[0022] 2) Weak magnetic separation: the slurry is transported to the magnetic separator through the pipeline, and the magnetic field strength is controlled at 1500 Oersted ~, and the iron grade is 52.83% crude iron concentrate and tailings of weak magnetic separation; the slurry can be separated by weak magnetic separation Part of the iron in the iron is selected in advance to reduce the amount of subsequent proc...

Embodiment 2

[0024] Embodiment 2, a method for reclaiming iron from sintering head three or four electric field dust removal, comprising the following steps:

[0025] 1) Slurry mixing: Add dust from the three or four electric fields of the machine head into the mixing tank, add water at the same time, control the total liquid-solid ratio at 2.2, control the stirring speed at 240 rpm, and at the same time, pass compressed air and Steam to obtain a uniformly dispersed slurry; specific liquid-solid ratio, specific rotational speed, and compressed air to make the slurry more uniform;

[0026] 2) Weak magnetic separation: the slurry is transported to the magnetic separator through the pipeline, and the magnetic field strength is controlled at 2000 Oersted, and the iron grade is 56.69% crude iron concentrate and weak magnetic separation tailings; Part of the iron is selected in advance to reduce the amount of subsequent processing;

[0027] 3) Centrifugal separation: Send the weak magnetic sepa...

Embodiment 3

[0028] Embodiment 3, a method for recovering iron from sintering head three or four electric field dedusting, comprising the following steps:

[0029] 1) Slurry mixing: Add dust from the three or four electric fields of the machine head into the mixing tank, add water at the same time, control the total liquid-solid ratio at 1.8, control the stirring speed at 180 rpm, and at the same time pass compressed air and Steam to obtain a uniformly dispersed slurry; specific liquid-solid ratio, specific rotational speed, and compressed air to make the slurry more uniform;

[0030] 2) Weak magnetic separation: the slurry is transported to the magnetic separator through the pipeline, and the magnetic field strength is controlled at 1800 Oersted, and the iron grade is 54.76% crude iron concentrate and tailings of weak magnetic separation; Part of the iron is selected in advance to reduce the amount of subsequent processing;

[0031] 3) Centrifugal separation: send the weak magnetic separ...

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PUM

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Abstract

The invention discloses a method for recovering iron from fly ash in third and fourth electric fields of a sintering machine head. The method includes the following steps that (1) slurry mixing is carried out, wherein the fly ash in the third and fourth electric fields of the sintering machine head is added into a stirring groove, water is added, then stirring is carried out, meanwhile, compressedair and steam are led into the bottom of the stirring groove, and the aims are that fly ash sediment is prevented and the solubility of solvend in the fly ash is improved; (2) low intensity magneticseparation is carried out, wherein slurry is conveyed to a magnetic separator through a pipe, and crude iron ore concentrate and low intensity magnetic separation tailings are obtained; and (3) centrifugal separation is carried out, wherein the low intensity magnetic separation tailings are fed into a gravity centrifugal separator, iron ore concentrate and tailings are obtained, the iron ore concentrate and the crude iron ore concentrate are subject to dehydration through a plate-and-frame filter press, and an obtained filter cake can be directly returned to be subject to a sintering process.The method is simple in process procedure, high in applicability and low in machining cost, the iron ore concentrate with the iron grade higher than 50% can be obtained, and the content of lead in theiron ore concentrate is smaller than 1%.

Description

technical field [0001] The invention belongs to the technical field of metallurgical slag recovery and utilization in iron and steel enterprises, and more specifically relates to a method for recovering iron from 3-4 electric field dedusting ash of sintering heads. Background technique [0002] In the sintering process of iron and steel enterprises, the flue gas from the draft sintering large flue needs to pass through the electrostatic precipitator before entering the desulfurization process. The dust from the three or four electric fields has low iron content, high potassium and lead content, and extremely fine particle size, -200 mesh particles. Extremely accounted for more than 80%. If these three or four electric field dusts continue to return to the sintering process, it will cause production problems such as sintering machine paste and poor operation of the electric dust removal at the machine head. If they accumulate, they contain a large amount of soluble halides, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03B7/00
CPCB03B7/00
Inventor 蒋朋钢于恒
Owner 苏州固利环保科技有限公司
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