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Method for recycling elementary substance iron from iron-containing dust sludge

A technology for recycling bills and iron dust, which is applied in mechanical material recycling, recycling technology, solid separation, etc., can solve the problems of unrecovered elemental Fe and achieve the effect of green and efficient separation

Inactive Publication Date: 2019-11-26
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the prior art, magnetic separation is used to recover iron from iron-containing dust and sludge, but the resulting product is iron oxide, and there is no relevant technical report on the recovery of elemental Fe.

Method used

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  • Method for recycling elementary substance iron from iron-containing dust sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: The iron-containing dust and sludge in this embodiment is the dust removal coarse ash in front of the blast furnace of a certain iron and steel plant in Yunnan;

[0019] Such as figure 1 As shown, a method for recovering elemental iron from iron-containing dust sludge, the specific steps are as follows:

[0020] (1) Grinding the iron-containing dust sludge to -200 mesh accounts for 90% to obtain iron-containing dust sludge powder, adding water to adjust the slurry to a pulp concentration of 20wt%; the total iron (TFe) content in the iron-containing dust sludge is 56%, The content of elemental Fe is 46%;

[0021] (2) Put the ore slurry in step (1) into the spiral chute for a roughing and a beneficiation to obtain the spiral chute concentrate, the spiral chute middlings and the spiral chute tailings, and the spiral chute middlings and the spiral chute tailings are combined into heavy Tailings selection; the diameter of the spiral chute is Φ600mm, and the p...

Embodiment 2

[0024] Embodiment 2: The iron-containing dust and sludge of this embodiment is the converter coarse ash of a certain iron and steel plant in Yunnan;

[0025] Such as figure 1 As shown, a method for recovering elemental iron from iron-containing dust sludge, the specific steps are as follows:

[0026] (1) Grinding the iron-containing dust sludge to -200 mesh accounts for 85% to obtain iron-containing dust sludge powder, adding water to adjust the slurry to a pulp concentration of 40wt%; the total iron (TFe) content in the iron-containing dust sludge is 33%, The content of elemental Fe is 13%;

[0027] (2) Put the ore slurry in step (1) into the spiral chute for a roughing and a beneficiation to obtain the spiral chute concentrate, the spiral chute middlings and the spiral chute tailings, and the spiral chute middlings and the spiral chute tailings are combined into heavy Tailings selection; the diameter of the spiral chute is Φ1200mm, and the pitch is 340mm;

[0028] (3) Ste...

Embodiment 3

[0030] Embodiment 3: The iron-containing dust and sludge in this embodiment is fine ash from blast furnace dedusting in a certain iron and steel plant in Yunnan;

[0031] Such as figure 1 As shown, a method for recovering elemental iron from iron-containing dust sludge, the specific steps are as follows:

[0032] (1) It has been determined that the converter dedusting fine ash -200 mesh accounts for more than 95%, which can be regarded as iron-containing dust sludge powder. The fine ash is mixed with water to make the slurry concentration 30wt%; the iron-containing dust sludge contains all iron ( TFe) content is 48%, elemental Fe content is 16%;

[0033] (2) Put the ore slurry in step (1) into the spiral chute for a roughing and a beneficiation to obtain the spiral chute concentrate, the spiral chute middlings and the spiral chute tailings, and the spiral chute middlings and the spiral chute tailings are combined into heavy Tailings selection; the diameter of the spiral chut...

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Abstract

The invention relates to a method for recycling elementary substance iron from iron-containing dust sludge, and belongs to the technical field of ore processing. The method comprises the steps that the particle size of the iron-containing dust sludge is measured, if the iron-containing dust sludge with the particle size of -200 mesh accounts for 85% or above in the iron-containing dust sludge, theiron-containing dust sludge is iron-containing dust sludge powder, if the iron-containing dust sludge with the particle size of -200 mesh accounts for 85% or below in the iron-containing dust sludge,the iron-containing dust sludge is ground till the iron-containing dust sludge with the particle size of -200 mesh accounts for 85% or above, the iron-containing dust sludge powder is obtained, and water is added into the iron-containing dust sludge powder to be mixed till the ore pulp concentration is between 20 wt% and 40 wt%; ore pulp is fed into a spiral chute to be subjected to primary roughing and primary selecting, spiral chute concentrate, spiral chute middling and spiral chute tailings are obtained, and the spiral chute middling and the spiral chute tailings are mixed into reselection tailings; and the spiral chute concentrate is fed into a wet weak magnetic separator to be subjected to primary wet weak magnetic roughing, roughed concentrate and roughed tailings are obtained, theroughed concentrate is subjected to primary wet weak magnetic selecting, selected concentrate and selected tailings are obtained, the roughed tailings and the selected tailings are mixed into magnetic separation tailings, and the selected concentrate is iron ore concentrate. The grade of the elementary substance iron in the iron ore concentrate can reach 80%-88%, and the recovery rate of iron islarger than 85%.

Description

technical field [0001] The invention relates to a method for recovering elemental iron from iron-containing dust, belonging to the technical field of mineral processing. Background technique [0002] The production capacity of my country's iron and steel industry is huge, ranking first in the world, and a large amount of iron-containing dust is produced in the process of iron and steel production. The so-called iron-containing dust refers to a large amount of solid waste obtained by iron and steel enterprises after dry dust removal, wet dust removal and wastewater treatment in the process of raw material preparation, sintering, pelletizing, ironmaking, steelmaking and steel rolling. According to statistics, in 2018, my country's crude steel output exceeded 900 million tons, and pig iron output exceeded 770 million tons. Every ton of steel produced produced about 100 kg of iron-containing dust. Based on this, it is estimated that the annual production of iron-containing dust ...

Claims

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Application Information

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IPC IPC(8): B03B9/06B03B1/00
CPCB03B9/06B03B1/00Y02W30/52
Inventor 刘建曾勇董文超文书明
Owner KUNMING UNIV OF SCI & TECH
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