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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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

Method used

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

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Example Embodiment

[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 -200 mesh 85%, mixed with sodium sulfate and sodium borate according to the mass percentage of 10% and 2% respectively, and pelletized with bituminous coal as reducing agent. Roast at 1000℃ for 60min, crush the cooled reduced pellets, put them in a ball mill and grind them to -200 mesh at a concentration of 50%, and the pulp is magnetically separated at a magnetic field strength of 0.1T. Mine TFe grade 93.3%, Al 2 O 3 Content is 0.78%, SiO 2 The content is 0.23%, and the recovery rate of iron is 93.6%.

Example Embodiment

[0011] Example 2: TFe content 47.69%, Al 2 O 3 Content 8.96%, SiO 2 Iron ore with a content of 4.30% is crushed and ground to -200 mesh, accounting for 80%, and sodium sulfate and sodium borate are respectively mixed with sodium sulfate and sodium borate according to the mass percentage of 15% and 2.5%. The pellets were roasted at a temperature of 1050 °C for 45 minutes, and the cooled reduced pellets were broken and placed in a ball mill to grind to -200 mesh at a concentration of 50%, and the slurry was magnetically separated at a magnetic field strength of 0.1T. Obtained iron grade 90.78%, Al 2 O 3 Content 0.98%, SiO 2 Metal iron powder with a content of 0.45%, the recovery rate of iron is 93.85%.

Example Embodiment

[0012] Example 3: TFe content 47.69%, Al 2 O 3 Content 8.96%, SiO 2 Iron ore with a content of 4.30% is crushed and ground to -200 mesh, accounting for 75%, and sodium sulfate and sodium borate are respectively mixed with sodium sulfate and sodium borate according to the mass percentage of 20% and 2.5%. The pellets were roasted at a temperature of 1050°C for 60min, and the cooled reduced pellets were broken and placed in a ball mill to grind to -200 mesh at a concentration of 60%. Obtained iron grade 92.27%, Al 2 O 3 Content 0.76%, SiO 2 Metal iron powder with a content of 0.32%, the recovery rate of iron is 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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