Magnetic seed magnetization dry-separation process for extracting iron from sintering dust

A magnetic seed and dry separation technology, applied in the fields of magnetic separation, chemical instruments and methods, solid separation, etc., can solve the problems of waste water treatment, water pollution, large water consumption, etc. cost effect

Inactive Publication Date: 2018-11-16
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Dust removal ash is rich in water-soluble sodium salts, potassium salts and heavy metals, so it is not suitable for stockpiling and deep burial. Most iron and steel enterprises make comprehensive use of it by directly returning it to sintering ingredients, but this will affect the quality of steel Subsequent production, energy consumption, and steel quality have a serious impact on the factory
Most of the current treatment methods use water washing, which has the problems of large water consumption and waste water treatment, which is easy to cause water pollution

Method used

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  • Magnetic seed magnetization dry-separation process for extracting iron from sintering dust

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Embodiment 1

[0016] The sintering dust removal ash that this implementation of the present invention adopts comes from Jiuquan Iron and Steel Sintering Plant, and the sintering dust removal ash of iron grade 32% is carried out following treatment:

[0017] A sintering and dedusting ash magnetic seed magnetization dry separation process for iron extraction, specifically comprising the following steps:

[0018] Step A. adopt the spiral dry type magnetic separator of field strength 2000Oe, carry out weak magnetic iron extraction to dedusting ash, weak magnetic separation concentrate grade 56%, concentrate yield 20%, weak magnetic separation tail gray iron grade 26%, tailings The ash yield is 80%.

[0019] Step B. Add 5% fly ash magnetic seeds to the tail ash of weak magnetic separation, the grade is 56%, and the specific magnetic susceptibility coefficient is 90000 (1×10 － 9 m 3 / kg), heated to 70°C and vigorously mixed for magnetization, iron ions form magnetic aggregation with the magnet...

Embodiment 2

[0023] The sintering dust removal ash that this implementation of the present invention adopts comes from Jiuquan Iron and Steel Sintering Plant, and the sintering dust removal ash of iron grade 35% is carried out following treatment:

[0024] A sintering and dedusting ash magnetic seed magnetization dry separation process for iron extraction, specifically comprising the following steps:

[0025] Step A. adopt the spiral dry magnetic separator of field intensity 2000Oe, carry out weak magnetic iron extraction to dedusting ash, weak magnetic separation concentrate grade 57%, concentrate yield 22%, weak magnetic separation tail gray iron grade 28.8%, tailings The ash yield is 78%.

[0026] Step B. Add 10% fly ash magnetic seeds to the tail ash of weak magnetic separation, the grade is 56%, and the specific magnetic susceptibility coefficient is 95000 (1×10 －9 m 3 / kg), heated to 70°C and vigorously mixed for magnetization, iron ions form magnetic aggregation with the magnetic ...

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Abstract

The invention provides a magnetic seed magnetization dry-separation process for extracting iron from sintering dust. The process comprises the following main process steps: carrying out weakly-magnetic iron extraction on sintering dust by using a fully-sealed spiral dry magnetic separator with a field strength of 2000 Oe; adding 5 to 10% of flyash magnetic seeds into weakly-magnetic tail dust, carrying out heating to 70 DEG C, then carrying out hermetic and powerful mixing and magnetization, and allowing iron ions to realize magnetic aggregation with the magnetic seeds as a core; and carryingout separation by using a fully-sealed spiral dry magnetic separator with a field strength of 3000 Oe, and combining a weakly-magnetic concentrate and a concentrate separated through magnetic seed magnetization to form a comprehensive iron ore concentrate with a grade of 55% or more, wherein the magnetic seeds are not recovered and used as a sintering accessory together with the iron ore concentrate, and tail dust obtained after iron extraction is used as a raw material for extraction of useful elements such as K and Pb. The fully-sealed weakly magnetic and magnetic seed magnetization separation process is adopted in the invention for iron extraction, so iron resources in the sintering dust are recovered as much as possible; and the produced iron ore concentrate without alkali metals is used as a sintering accessory, so the problem that cyclic enrichment of alkali metals influences blast furnace production is overcome.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and relates to a processing method for dedusting ash obtained after sintering of iron ore, in particular to a process for iron extraction by magnetic seed magnetization dry separation of sintered dedusting ash. Background technique [0002] Iron ore sintering is an important process for the preparation of furnace materials for steel production. The average composition of C1, K, Na, S, F, Pb and other compounds in the dust collected by the electrostatic precipitator of the sintering head accounts for 48% of the total dust. Among them, the average content of K and Pb (in K 2 O and PbO) reach 6-10% and 4-6% respectively, iron element contains 32-35%, including ferromagnetic Fe 3 o 4 and weakly magnetic Fe 2 o 3 . Dust removal ash is rich in water-soluble sodium salts, potassium salts and heavy metals, so it is not suitable for stockpiling and deep burial. Most iron and steel enterpri...

Claims

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Application Information

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IPC IPC(8): B03C1/01
CPCB03C1/01
Inventor 展仁礼边立国王欣郭忆
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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