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Beneficiation method for extracting iron and carbon from blast furnace bag dust

A technology of bag dust removal and ore dressing method, which is applied in the field of carbon ore dressing and iron extraction from blast furnace bag dust removal ash. It can solve the problems of long process flow, complicated production management, and difficult chemical control, etc., and achieve simple flotation process and enhanced selectivity. , Good sorting effect

Inactive Publication Date: 2016-03-09
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the selection of carbon and iron by flotation process has obtained good separation indicators, it has brought about a series of problems such as difficult chemical control, long process flow, and complicated production management. Therefore, if a new type of high-efficiency is developed The advanced process technology extracts the valuable elements in the bag dust removal and increases its added value, which has important practical significance for clean production, energy saving and emission reduction in the steel industry

Method used

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  • Beneficiation method for extracting iron and carbon from blast furnace bag dust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Raw materials: blast furnace bag dust; sodium hexametaphosphate; water glass

[0025] The total iron grade of the blast furnace bag dust used is 26.54%, SiO 2 is 15.78%, fixed carbon content is 26.77%, SO 3 It is 3.45% and CaO is 6.13%. The iron minerals mainly exist in the form of hematite, magnetite and elemental iron.

[0026] See figure 1 , Put the blast furnace cloth bag dust into the slag screen, and remove the low-grade coarse-grained waste with a yield of 4.15% through the slag screen, and the fine-grained products flow into the pump pool.

[0027] Add a dispersant to the pump pool, the dispersant is a compound of sodium hexametaphosphate and water glass, the compound of sodium hexametaphosphate: water glass is 2.4:1 by weight, and the dosage per ton of dry ore is 260g / t. The ore pulp after dosing is pumped into the spiral chute for sorting.

[0028] The concentrate products sorted by the spiral chute enter the first ring shaker, and after sorting, the iron ...

Embodiment 2

[0031] Raw materials: blast furnace bag dust; sodium hexametaphosphate; water glass

[0032] The total iron grade of the blast furnace bag dust used is 29.18%, SiO 2 is 13.45%, fixed carbon content is 28.45%, SO 3 is 3.71%, CaO is 8.02%, and iron minerals mainly exist in the form of hematite, magnetite and elemental iron.

[0033] See figure 1 , the blast furnace bag dust is removed by the slag screen to remove the low-grade coarse-grained waste with a yield of 5.07%, and the fine-grained products flow into the pump pool;

[0034] Add a dispersant to the pump pool, the dispersant is a compound of sodium hexametaphosphate and water glass, sodium hexametaphosphate: water glass is compounded at a weight ratio of 2.8:1 to form a dispersant, and the amount per ton of dry ore is 230g / t. The ore pulp after dosing is pumped into the spiral chute for sorting;

[0035] Concentrate products sorted by spiral chute enter 1 # The ring shaker can obtain iron ore concentrate products wit...

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Abstract

The invention relates to a beneficiation method for extracting iron and carbon from blast furnace bag dust, and belongs to the technical field of mineral processing. A slag separating screen for the blast furnace bag dust is used for removing a part of low-grade coarse fraction waste materials, and a fine fraction product flows automatically into a pump pool. After a dispersing agent is added into the fine fraction product, the fine fraction product is driven into a spiral chute through a pump for screening. A concentrate product in the spiral chute enters a first annular shaking table, and a qualified iron concentrate product can be obtained after screening of the concentrate product. First tailing on the first annular shaking table flow automatically into a tailing pressure filter directly. A tailing product in the spiral chute enters a linear vibrating screen. An oversize product is the qualified carbon concentrate, and an undersize product enters a second annular shaking table. A concentrate product on the second annular shaking table returns to the first annular shaking table for rescreening. A second tailing product enters the tailing pressure filter. Filter liquor of the pressure filter serves as circulating water for a beneficiation plant. According to the beneficiation method for extracting the iron and the carbon from the blast furnace bag dust, a valuable element containing the blast furnace bag dust is extracted, the additional value of the valuable element is increased, and the beneficiation method has important practical significance for cleaner production, energy conservation and emission reduction in the iron and steel industries.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a beneficiation method for extracting iron and carbon from blast furnace bag dust. Background technique [0002] Blast furnace bag dust is the solid particles discharged from the ironmaking blast furnace during the smelting process. Its main components are carbon, iron, zinc, etc., and it has high utilization value. In recent years, there are three main ways to dispose of blast furnace bag dust: first, as solid waste in iron and steel enterprises, it is often disposed of by stockpiling or discharging, which not only causes a serious waste of resources, but also causes great harm to the environment. Large-scale pollution, large-scale iron and steel enterprises have been basically eliminated; the second is to return directly to sintering for recycling, because the dust particle size of the bag dust collector is relatively fine, and the harmful impurities carr...

Claims

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Application Information

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IPC IPC(8): B03B7/00
CPCB03B7/00
Inventor 高志明张晋霞梁冰邹玄
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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