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Low-temperature hydrogen reduction magnetizing roasting technology for refractory iron ores

A magnetized roasting and iron ore technology, applied in the fields of metallurgy and mineral processing, can solve the problems of uneven roasting, long roasting time, and high roasting cost, and achieve the solution of non-uniform roasting, improve the capacity of magnetized roasting, and improve the heat transfer efficiency. Effect

Active Publication Date: 2018-12-07
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a low-temperature hydrogen reduction magnetization roasting process for refractory iron ore to s

Method used

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  • Low-temperature hydrogen reduction magnetizing roasting technology for refractory iron ores
  • Low-temperature hydrogen reduction magnetizing roasting technology for refractory iron ores
  • Low-temperature hydrogen reduction magnetizing roasting technology for refractory iron ores

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The raw material refractory iron ore has a TFe content of 36.45%, a FeO content of 6.40%, and iron minerals mainly exist in the form of specularite, hematite, siderite, and limonite, with a particle size of 0-15mm; the reducing agent is Ad 7.56%, Vdaf 48.54%, Fcad 45.28%, St.d 0.39% Mt 10.7, Qnet.var 23060J / g, particle size 5-15mm.

[0057] The following process steps are adopted for processing:

[0058] Step 1. Crushing and classification:

[0059] Crush the iron ore into 0-15mm and then classify it into three grades: 0-1mm, 1-5mm and 5-15mm;

[0060] Step 2, 5-15mm size iron ore magnetization roasting:

[0061] Iron ore with a size of 5-15mm is added from the feed end of the rotary kiln for magnetization roasting. The iron ore with a size of 5-15mm moves to the discharge end with the rotation of the kiln in the rotary kiln. Raise the temperature, and control the temperature of the material at 780°C when entering the front stage of roasting, and the time of magnetiz...

Embodiment 2

[0076] The raw material refractory iron ore has a TFe content of 37.44%, a FeO content of 10.22%, iron minerals mainly exist in the form of rhombohedron and limonite, with a particle size of 0-100mm; reducing agents Ad 7.56%, Vdaf 48.54%, Fcad 45.28% , St.d 0.39% Mt 10.7, Qnet.var 23060J / g, particle size 5-15mm.

[0077] The following process steps are adopted for processing:

[0078] Step 1. Crushing and classification:

[0079] Crush the iron ore into 0-15mm and then classify it into three grades: 0-1mm, 1-5mm and 5-15mm;

[0080] Step 2, 5-15mm size iron ore magnetization roasting:

[0081] Iron ore with a size of 5-15mm is added from the feed end of the rotary kiln for magnetization roasting. The iron ore with a size of 5-15mm moves to the discharge end with the rotation of the kiln in the rotary kiln. Raise the temperature, and control the temperature of the material at 830°C when entering the front stage of roasting, and the time of magnetization roasting is 35 minute...

Embodiment 3

[0096] The raw material refractory iron ore has a TFe content of 36.45%, a FeO content of 6.40%, and iron minerals mainly exist in the form of specularite, hematite, siderite, and limonite, with a particle size of 0-15mm; the reducing agent is Ad 7.56%, Vdaf 48.54%, Fcad 45.28%, St.d 0.39% Mt 10.7, Qnet.var 23060J / g, particle size 5-15mm.

[0097] The following process steps are adopted for processing:

[0098] Step 1. Crushing and classification:

[0099] Crush the iron ore into 0-15mm and then classify it into three grades: 0-1mm, 1-5mm and 5-15mm;

[0100] Step 2, 5-15mm size iron ore magnetization roasting:

[0101] Iron ore with a size of 5-15mm is added from the feed end of the rotary kiln for magnetization roasting. The iron ore with a size of 5-15mm moves to the discharge end with the rotation of the kiln in the rotary kiln. Raise the temperature, and control the temperature of the material at 800°C when entering the front stage of roasting, and the time of magnetiz...

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Abstract

The invention discloses a low-temperature hydrogen reduction magnetizing roasting technology for refractory iron ores and belongs to the technical field of mineral processing and metallurgy. The technology comprises the following steps of smashing and grading, magnetizing roasting of iron ores of 5-15 mm granulometric class, magnetizing roasting of iron ores of 1-5 mm granulometric class, magnetizing roasting of iron ores of 0-1 mm granulometric class, material cooling, material dry separation and material separation. According to the low-temperature hydrogen reduction magnetizing roasting technology for the refractory iron ores, according to the mechanism that iron ores of different granulometric classes are provided with different magnetizing roasting characteristics, the iron ores are classified into three granulometric classes of big, medium and small, and different kiln-entering manners are adopted so that magnetizing roasting can be conducted; and then low-temperature hydrongen reduction rapid magnetizing roasting is achieved through throwing of granulous high volatile pea coal from a kiln head of a rotary kiln; high-quality iron ore concentrate is acquired; magnetizing roasting time of the rotary kiln is effectively shortened; productivity is improved; and energy consumption of the system is lowered by a large margin.

Description

technical field [0001] The invention belongs to the technical field of mineral processing and metallurgy, and relates to a low-temperature hydrogen reduction magnetization roasting process for refractory iron ore. Background technique [0002] At present, from the perspective of the magnetization roasting process, the magnetization roasting of iron powder ore can only be roasted in a rotary kiln or fluidized roasting, and the iron ore is usually roasted in a shaft furnace or crushed and then roasted in a rotary kiln. On the whole, although the test results of fluidized roasting show that the roasting efficiency is high, the large-scale application in the field still needs to be further improved; the key to the shaft furnace roasting lies in the extremely high requirements on the air permeability of the raw materials, and it is difficult for the fine ore to meet the requirements of the shaft furnace. In lump ore, there are often problems of large-grain under-burning and small...

Claims

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Application Information

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IPC IPC(8): C22B1/02
CPCC22B1/02Y02P10/20
Inventor 王明华雷鹏飞张志刚权芳民王永刚杏仲全张红军王建平寇明月靳建毅马胜军邢德君陈平
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD