Process for recovering iron and carbon elements from blast furnace gas ash

A technology for recovering blast furnace gas ash and iron, applied in recycling technology, improvement of process efficiency, chemical instruments and methods, etc., can solve the problems of high sorting cost and low process index, and achieve high product quality and technical index advantages , The effect of high removal rate

Active Publication Date: 2012-01-18
ANSTEEL GRP MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These three process indicators are not high, and the selection cost is relatively high

Method used

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  • Process for recovering iron and carbon elements from blast furnace gas ash
  • Process for recovering iron and carbon elements from blast furnace gas ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] 1) Flotation of the gas ash with iron content 31.46%, carbon content 37.90%, -0.071mm particle size percentage by weight and 43.6% weight percentage is directly carried out, and the gas ash is adjusted to a weight concentration of 35% by adding water in the first stirring tank The ore slurry is fed into the second stirring tank, and the flotation reagents, 1050 g / t diesel oil and 215 g / t turpentine oil are sequentially added to the second stirring tank.

[0078] 2) The concentrate from rough flotation is fed to fine flotation. The concentrate from fine flotation is the final carbon concentrate with carbon content of 85.26%, and the carbon recovery rate is 81.55%.

[0079] 3) The coarse flotation tailings and the fine flotation tailings are combined into flotation tailings. The flotation tailings with an iron content of 44.27% and a weight concentration of 45% are fed into the coarse flotation spiral flow cell for heavy selection ,

[0080] 4) The concentrate with 59.2% iron c...

Embodiment 2

[0086] 1) Flotation of the gas ash with iron content of 34.61%, carbon content of 36.84%, and -0.071mm content of 40.2% is directly carried out. The gas ash is added to the first agitating tank to prepare a slurry with a weight concentration of 35%. Two agitating tanks, and adding flotation reagents to the second agitating tank, diesel 985g / t, turpentine 205g / t, and then fed to the rough flotation,

[0087] 2) The concentrate from coarse flotation is fed to fine flotation, and the concentrate from fine flotation is the final carbon concentrate with 84.87% carbon content, and the carbon recovery rate is 81.18%.

[0088] 3) The coarse flotation tailings and the fine flotation tailings are combined to form flotation tailings. The flotation tailings with an iron content of 48.19% and a weight concentration of 43% are fed into the roughing spiral flow trough for heavy selection. ,

[0089] 4) The concentrate with 60.32% of the iron content of the roughing spiral chute is fed into the sel...

Embodiment 3

[0095] 1) Flotation of the gas ash with iron content of 38.23%, carbon content of 33.20%, and -0.071mm content of 46.5% is directly carried out. The gas ash is mixed with water in the first agitation tank to form a slurry with a weight concentration of 33% and fed into the Two agitating tanks, and adding flotation reagents, diesel 960g / t, turpentine 190g / t, into the second agitating tank in turn, feed the crude flotation after adding the chemicals,

[0096] 2) The concentrate from rough flotation is fed to fine flotation, and the concentrate from fine flotation is the final carbon concentrate with carbon content of 85.07%, and the carbon recovery rate is 81.74%.

[0097] 3) The coarse flotation tailings and the fine flotation tailings are combined into flotation tailings. The flotation tailings with an iron content of 49.93% and a weight concentration of 42% are fed into the coarse flotation spiral flow cell for heavy selection ,

[0098] 4) The concentrate with 60.6% iron content i...

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Abstract

The invention relates to the technical field of blast furnace ash resource reutilization, in particular to a process for recovering iron and carbon elements from blast furnace gas ash. A flotation method is adopted for recovering carbon, a re-separation and magnetic separation method is adopted for recovering iron, the total separation process is the combined technical process flow of flotation, re-separation and magnetic separation, the gas ash enters the coarse flotation after the slurry preparation and medicine adding, coarse flotation concentrates enter fine flotation, the fine flotation concentrates are final carbon concentrates, coarse flotation tailings and fine flotation tailings enter a re-separation coarse separation spiral chute to separate out re-separation tailings, the coarse spiral concentrates enter a fine separation spiral chute to obtain re-separation concentrates, ores in a fine separation spiral chute carries out self circulation, the tailings in the fine separation spiral chute enter a weak magnetic separation machine for carrying out magnetic separation, the weak magnetic concentrates and the re-separation concentrates are combined into final iron concentrates, and the weak magnetic tailings and the re-separation tailings are combined into final tailings. The process has the beneficial effects that the process is simple, the varieties of reagents are few,the process configuration is reasonable, the purification and impurity removal effects are obvious, the product quality is better, the recovery rate is high, and a new path is provided for the comprehensive utilization of the blast furnace gas ash.

Description

Technical field [0001] The invention relates to the technical field of blast furnace gas ash resource reuse, in particular to a process for recovering iron and carbon elements from blast furnace gas ash. Background technique [0002] Blast furnace gas ash is the smoke and dust discharged together with blast furnace gas in the process of blast furnace ironmaking. The dust collected by the dry dust collector is in the form of gray powder with a higher particle size. The furnace gas mud is coarse, and the iron minerals are mainly FeO. The gas ash is dry and easy to flow, causing serious pollution from stacking and transportation. Blast furnace gas ash is one of the main solid wastes of iron and steel enterprises. In recent years, my country’s steel production has become the world’s first. The total amount of blast furnace gas ash produced by iron-making blast furnaces is quite large. Calculated by 1.7% of iron output, the country’s annual output of gas ash is nearly 2 million to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00B03D1/00B03C1/00C21B3/04
CPCY02P10/20Y02W30/50
Inventor 王陆新周惠文宋均利刘双安
Owner ANSTEEL GRP MINING CO LTD
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