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Method for extracting iron from iron mine tailings through strong magnetic, pre-concentration deep reduction

A technology for iron ore tailings and pre-enrichment, which is applied in chemical instruments and methods, magnetic separation, and improvement of process efficiency, can solve the problems of long process, no iron recovery technology, and many processes, so as to reduce residual iron. The effect of the content of

Active Publication Date: 2013-09-11
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Invention patent "Anshan-style lean magnetite tailings recovery process" (public number CN 101318159A), which involves an Anshan-style lean magnetite tailings recovery process , using a new single magnetic separation process of magnetic-demagnetization-demagnetization-demagnetization five-stage magnetic separation and fine screen self-circulation to recover tailings. This process has many procedures, a long process, and a large investment in equipment. Recovery Technology of Iron from Magnetite-type Fine Hematite Tailings
The patent does not provide the recovery rate of the obtained concentrate product, and does not refer to the recovery technology of iron in the tailings of magnetite quartzite type hematite

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  • Method for extracting iron from iron mine tailings through strong magnetic, pre-concentration deep reduction

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Experimental program
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Effect test

Embodiment 1

[0018] (1) Grinding and strong magnetic separation: The tailings of Anshan Iron and Steel Qidashan with a residual iron content of 14.79% were subjected to wet grinding to obtain a pulp with a mass concentration of 65% and a grinding particle size of Placed under the condition of 803.15 kA / m for strong magnetic separation, the grade of iron in the pre-enriched tailings concentrate after strong magnetic separation is 42.90%, the recovery rate is 84.8%, and the content of residual iron in the secondary tailings is 5.2%.

[0019] (2) Deep reduction ingredients: mix the pre-enriched tailings concentrate obtained in step (1) after strong magnetic separation with a reducing agent and a reducing agent with a particle size of 0-3mm to obtain a deep reducing mixture; the reducing agent The addition amount is 25% of the dry basis mass of the pre-enriched tailings concentrate after strong magnetic separation; the addition amount of the reduction aid is 15% of the dry basis mass of the pr...

Embodiment 2

[0025] (1) Grinding and strong magnetic separation: wet-grind the tailings of Angang Qidashan Iron and Steel Co. Placed under the condition of 835.32kA / m for strong magnetic separation, the grade of iron in the pre-enriched tailings concentrate after strong magnetic separation is 39.97%, the recovery rate is 87.91%, and the content of residual iron in the secondary tailings is 5.35%.

[0026] (2) Deep reduction ingredients: mix the pre-enriched tailings concentrate obtained in step (1) after strong magnetic separation with a reducing agent and a reducing agent with a particle size of 0-3mm to obtain a deep reducing mixture; the reducing agent The addition amount is 17.5% of the dry basis mass of the pre-enriched tailings concentrate after strong magnetic separation; the addition amount of the reducing agent is 21% of the dry basis mass of the pre-enrichment tailings concentrate.

[0027] (3) Reduction: Deep reduction is carried out in an oxidizing atmosphere kiln. Put the dee...

Embodiment 3

[0032] (1) Grinding and strong magnetic separation: The tailings of Anshan Iron and Steel Qidashan with a residual iron content of 14.79% were wet-milled to obtain a pulp with a mass concentration of 65% and a grinding particle size of -0.037mm, accounting for 63.68%. Placed under the condition of 812.10 kA / m for strong magnetic separation, the grade of iron in the pre-enriched tailings concentrate after strong magnetic separation was 37.63%, the recovery rate was 82.93%, and the content of residual iron in the secondary tailings was 3.71%.

[0033] (2) Deep reduction ingredients: mix the pre-enriched tailings concentrate obtained in step (1) after strong magnetic separation with a reducing agent and a reducing agent with a particle size of 0-3mm to obtain a deep reducing mixture; the reducing agent The addition amount is 17.5% of the dry basis mass of pre-enriched tailings concentrate after strong magnetic separation; the addition amount of reducing agent is 6% of the dry bas...

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Abstract

The invention discloses a method for extracting iron from iron mine tailings through strong magnetic separation, pre-concentration deep reduction, belonging to the comprehensive utilization field of tailings. The method comprises the following steps: carrying out wet-process levigation and strong magnetic separation on the iron mine tailings with 10%-25% of residual iron to acquire pre-concentrated iron tailings concentrate with grade of 35%-45% and recovery rate of 80-85%, wherein the content of residual iron in secondary tailings is 3-6%; mixing the pre-concentrated tailings concentrate with a reducing agent and a reducing assistant, so as to carry out deep reduction in a sealed kiln furniture container of an oxidizing atmosphere kiln or a reducing atmosphere kiln, wherein in the oxidizing atmosphere kiln, the reducing temperature is 1150 DEG C to 1350 DEG C, and the reducing time is 0.5 to 10 hours; in the reducing atmosphere kiln, the reducing temperature 1250 DEG C to 1450 DEG C and the reducing time is 0.1 to 1 hour; and carrying out wet-process grinding and magnetic separation on the cooled reduced material to obtain metal iron powder with total iron grade of 90%-95%, and recovery rate of 90%-99%. With the adoption of the method, the content of residual iron in the secondary tailings is greatly reduced while the problem of recycling much residual iron in the iron tailings is solved.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of tailings, in particular to a technology for iron ore tailings strong magnetic pre-enrichment deep reduction and iron extraction. Background technique [0002] In recent years, with the advancement of beneficiation technology and the rapid rise in the price of iron ore concentrates, enterprises have relied on technological progress and increased beneficiation costs to continuously increase the recovery rate, but the discharged tailings still contain 10% to 15% of residual iron . Under the existing beneficiation technology, neither the old tailings that were discharged earlier nor the iron in the new tailings that are currently discharged have no economic value for further separation. For example, the Qidashan Iron Mine in Anshan Iron and Steel Co., Ltd. is a deposit type dominated by fine-grained hematite in the construction of Anshan-style magnetite quartzite, and it is one of the extr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/00B03C1/00B03C1/005
CPCY02P10/20
Inventor 倪文伏程红范敦城李瑾仇夏杰李媛
Owner UNIV OF SCI & TECH BEIJING