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Method for directly producing metallic iron powder with high-alumina iron ore

A technology for iron ore and metallic iron, applied in the field of high-alumina iron ore iron-aluminum separation, can solve the problems of large environmental pollution, long process and high energy consumption, and achieve the effects of less environmental pollution, improved quality and short process flow

Active Publication Date: 2008-10-29
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But as a raw material for ironmaking, the Al of this concentrate 2 o 3 The content still exceeds the standard. Even if it is used as an iron-making raw material, the iron concentrate must be sent to steelmaking after traditional agglomeration and blast furnace smelting. There are problems of long process, high energy consumption and serious environmental pollution.

Method used

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  • Method for directly producing metallic iron powder with high-alumina iron ore

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Experimental program
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Effect test

Embodiment 1

[0010] Example 1: TFe content 57.35%, Al 2 o 3 Content 5.43%, SiO 2 Iron ore with a content of 3.52%, crushed and ground to 85% of -200 mesh, mixed with sodium sulfate and sodium borate in proportions of 10% and 2% by mass to make pellets, using bituminous coal as a reducing agent, dry pellets Roast at 1000°C for 60 minutes, crush the cooled reduced pellets, place them in a ball mill and grind them to -200 mesh with a pulp concentration of 50% to account for 90%, and magnetically separate the pulp at a magnetic field strength of 0.1T. Ore TFe grade 93.3%, Al 2 o 3 content of 0.78%, SiO 2 The content is 0.23%, and the recovery rate of iron is 93.6%.

Embodiment 2

[0011] Example 2: TFe content 47.69%, Al 2 o 3 Content 8.96%, SiO 2 The iron ore with a content of 4.30% is crushed and ground to -200 mesh, accounting for 80%. According to the mass percentage of 15% and 2.5%, sodium sulfate and sodium borate are respectively mixed into pellets, and bituminous coal is used as a reducing agent. The pellets were roasted at 1050°C for 45 minutes, and the cooled reduced pellets were crushed, placed in a ball mill and ground to -200 mesh at a pulp concentration of 50% to account for 95%, and the pulp was magnetically separated under a magnetic field strength of 0.1T. Obtained iron grade 90.78%, Al 2 o 3 Content 0.98%, SiO 2 The metal iron powder with a content of 0.45% has an iron recovery rate of 93.85%.

Embodiment 3

[0012] Example 3: TFe content 47.69%, Al 2 o 3 Content 8.96%, SiO 2 The iron ore with a content of 4.30% is crushed and ground to -200 mesh, accounting for 75%. According to the mass percentage of 20% and 2.5%, sodium sulfate and sodium borate are respectively mixed into pellets, and bituminous coal is used as a reducing agent. The pellets were roasted at 1050°C for 60 minutes, and the cooled reduced pellets were crushed, placed in a ball mill and ground to -200 mesh with a pulp concentration of 60% to account for 90%, and the pulp was magnetically separated under a magnetic field strength of 0.1T. Obtained iron grade 92.27%, Al 2 o 3 Content 0.76%, SiO 2 The metal iron powder with a content of 0.32% has an iron recovery rate of 93.03%.

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Abstract

The invention provides a method for directly preparing a metal iron powder by high alumina ironstone. In the method, ironstones are smashed and ground, then mixed with an additive evenly for balling, coal-based direct reduction is carried out on the dry balling, after being smashed and ground, the reduction product is sorted by adopting low intensity magnetic separation, thus obtaining the metal iron powder in which the general iron level is more than 90%, the iron recovery rate is more than 90%, the content of Al2O3 is about 1.0%, and the content of SiO2 is less than 1%, the iron powder can be taken as the raw material of electric furnace steelmaking. The method of the invention can be applicable to the separation of aluminum and iron of ironstone in which the content of aluminum is higher and separation can be carried out difficultly by a physics method; by adopting the method, the metal iron powder which can satisfy the requirement of electric furnace steelmaking can be prepared directly by high alumina ironstone, the process flow is short, the production cost is low, and the environmental pollution is little, thus having wide application prospect.

Description

technical field [0001] The invention belongs to the field of mineral engineering, and relates to a method for processing iron ore with high aluminum content, in particular to a method for separating iron and aluminum from high-aluminum iron ore, which is closely symbiotic with aluminum-containing minerals and iron-containing minerals, and has a complex embedding relationship. . Background technique [0002] my country's iron ore resources are abundant, but most of them are low-grade ore or polymetallic symbiotic ore, which are generally difficult to sort. There are abundant aluminum-containing iron ores in my country and neighboring Southeast Asian countries. This kind of ore iron ore and aluminum minerals are closely embedded, and the monomer dissociation degree is low, so it is difficult to separate. It is a typical refractory iron ore. stone resources. It is well known that Al in iron ore 2 o 3 If the content is too high, the utilization coefficient of the blast furnac...

Claims

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Application Information

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IPC IPC(8): B22F9/00B22F9/18B22F1/00B22F9/04B03C1/00
Inventor 姜涛李光辉范晓慧刘牡丹张元波朱忠平郭宇峰许斌杨永斌黄柱成白国华李骞陈许玲孙娜陈丽勇
Owner CENT SOUTH UNIV
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