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Additive agent for iron-aluminum separation for high-alumina iron ore

An iron ore and additive technology, which is applied in the field of additives for the separation of aluminum and iron from high-aluminum iron ore, can solve the problems of high reduction temperature, undisclosed catalyst, and difficulty in industrialization, and achieve low reduction temperature, low price, and short reduction time short effect

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

AI Technical Summary

Problems solved by technology

There are also people who have carried out internal coal blending reduction research on red mud containing 15.32% aluminum and 38.9% iron grade. The red mud, reduced coal and A-type catalyst are mixed in a ratio of 83.6:13.9:2.5 and pressed into pellets. Sponge iron with an iron grade of 91.79% can be obtained after magnetic separation and cold solidification, but the catalyst is not disclosed, and the reduction temperature is high, so it is difficult to realize industrialization; foreign scholars also put aluminum-containing red mud in blast furnaces or electric furnaces Smelting and direct iron smelting have achieved preliminary results

Method used

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  • Additive agent for iron-aluminum separation for high-alumina iron ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1: 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 70%. The ore and sodium carbonate are mixed and pelletized at a mass ratio of 5:1. Bituminous coal is used as a reducing agent. Roasting for 120 minutes, the reduced product was placed in a ball mill and ground to -200 mesh at a concentration of 50%, accounting for 88%, and the pulp was magnetically separated under a magnetic field strength of 0.1T. 2 o 3 Content 4.37%, SiO 2 The content is 2.42%, and the recovery rate is 90.35%.

Embodiment 2

[0012] 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 70%. The ore and sodium sulfate are mixed and pelletized at a mass ratio of 4:1. Bituminous coal is used as a reducing agent. Roast for 90 minutes, put the reduced pellets in a ball mill after cooling down, and grind them to -200 mesh at a grinding concentration of 50%, accounting for 95%. The pulp is magnetically separated at a magnetic field strength of 0.1T. Al 2 o 3 Content is 1.93%, SiO 2 Content 1.15% recovery rate 75.36%.

Embodiment 3

[0013] 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 70%. According to the mass percentage of 14% and 3%, respectively, it is mixed with sodium carbonate and sodium borate to make pellets, and bituminous coal is used as a reducing agent. At 1020 Roast at a temperature of ℃ for 90 minutes. After the reduced pellets are cooled, place them in a ball mill and grind them to -200 mesh at a grinding concentration of 50%, accounting for 98%. The pulp is magnetically separated at a magnetic field strength of 0.1T to obtain an iron grade of 85.69%. , Al 2 o 3 Content 2.97%, SiO 2 The metal iron powder with a content of 1.96% has an iron recovery rate of 90.34%.

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Abstract

The present invention provides an Al-Fe separation additive of high-alumina iron ore, which consists of Na2SO4, Na2B4O7 and Na2CO3. When in use, the additive is ground with granularity less than 0.074mm and then evenly mixed with alumina iron ore for pelletization; coal is taken as the reducing agent and the dry pellets are reduced and roasted at certain temperature; the reduced pellets are magnetically selected after cooling, breaking and grinding, so as to obtain the metallic Fe power with TFe grade more than 90 percent, the content of Al2O3 about 1 percent and the content of SiO2 less than 1 percent; the recovery of the Fe is more than 90 percent. The additive can destroy the structure of the high-alumina iron ore and create conditions for the Al-Fe separation, which is especially suitable for the Al-Fe separation of the high-alumina iron ore when iron ore and alumina ore are embedded by fine particles or alumina exists in isomorphous form in iron mineral.

Description

technical field [0001] The invention relates to an additive, in particular to an additive for separating aluminum and iron from high aluminum iron ore. Background technique [0002] With the rapid development of my country's economy, the continuous rapid growth of the iron and steel industry has been driven, the demand for iron ore has increased rapidly, and the contradiction between supply and demand of iron ore has become increasingly prominent. The iron ore resources in my country are characterized by more lean ore and less rich ore. 97% of the iron ore iron grade is below 30%. The high-quality and easy-to-select iron ore resources are gradually decreasing. To meet the needs of industrial production. In the environment of increasingly tight iron ore resources, the mining of low-grade and refractory iron ore has been paid more and more attention. Blast furnace smelting requires Al in raw materials 2 o 3 The content generally cannot exceed 3%, because Al 2 o 3 A high c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B1/04B03C1/00
Inventor 姜涛李光辉范晓慧刘牡丹郭宇峰许斌朱忠平杨永斌黄柱成张元波白国华李骞陈许玲陈丽勇孙娜
Owner CENT SOUTH UNIV
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