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Metal reduction method

A metal and reducing agent technology, which is applied in the field of metal extraction, can solve the problems of slow reduction reaction speed, small gaps, and carbon dioxide cannot be discharged smoothly, and achieve the effects of accelerating reduction, eliminating heat transfer barriers, and saving time

Inactive Publication Date: 2010-08-04
QIANQIU ENERGY SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this process, it is generally believed that the smaller the particle size of the coal, the better, preferably less than 1mm, so that the coal can fully contact with the iron ore and the iron can be fully reduced. , due to the small particle size, the voids in the molding material are small, so that the carbon dioxide generated in the reduction reaction cannot be discharged smoothly, resulting in a slow down of the reduction reaction

Method used

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  • Metal reduction method
  • Metal reduction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Materials used:

[0031] Iron ore: iron content: 54.85%;

[0032] Reductant: processed anthracite particles with a particle size of 1mm to 2mm, that is, the particle size of anthracite can be any value in the range of 1mm to 2mm, such as 1mm, 1.5mm, 1.6mm, 1.7mm, 2mm, etc.;

[0033] Additive: calcium carbonate.

[0034] 1) Mix the processed iron ore with a particle size of 0.178 mm, anthracite particles with a particle size of 1 mm to 2 mm, and calcium carbonate with an average particle size of 0.074 mm, and then use a pelletizer to form pellets after fully stirring; The weight ratio of ore to coal particles and calcium carbonate is 4:2:1.

[0035] 2) Laying the pellets on a trolley, sending them into a rotary kiln (direct reduction furnace), heating to 1000°C, and keeping for 50 minutes to obtain reduced materials containing elemental iron;

[0036] 3) Send the reduced material into an electric arc furnace (melting furnace) for heating to obtain liquid iron and molt...

Embodiment 2

[0039] Materials used:

[0040] Iron ore: iron content: 57.22%;

[0041] Reductant: treated coke particles with a particle size of 2.2mm to 3mm, that is, the particle size of coke particles can be any value in the range of 2.2mm to 3mm, such as 2.2mm, 2.3mm, 2.4mm, 2.8mm, 3mm, etc.;

[0042] Additives: calcium carbonate, calcium oxide.

[0043] 1) Mix the treated iron ore with an average particle size of 0.178mm, coke particles with a particle size of 2.2mm to 3mm, calcium oxide with an average particle size of 0.074mm, and calcium carbonate with an average particle size of 0.074mm, and fully stir Then use a pelletizer to make pellets; wherein, the weight ratio of iron ore to coke particles and additives (calcium carbonate and calcium oxide) is 5:2:2.

[0044] 2) Lay the pellets on the fuming trolley, send them into the tunnel kiln (direct reduction furnace), heat to 1300°C, and keep for 20 minutes to obtain the reduced material containing elemental iron;

[0045] 3) The re...

Embodiment 3

[0048] Materials used:

[0049] Iron ore: Iron content: 54.89%;

[0050] Reductant: processed coal particles with a particle size of 2.5mm to 3mm, that is, the particle size of coal particles can be any value in the range of 2.5mm to 3mm, such as 2.5mm, 2.6mm, 2.7mm, 2.9mm, 3mm, etc.;

[0051] Additives: sodium carbonate, quartz powder.

[0052]1) Mix the processed iron ore with an average particle size of 0.178mm, coal particles with an average particle size of 2.5mm to 3mm, sodium carbonate with an average particle size of 0.078mm, and quartz powder with an average particle size of 0.078mm. After stirring, use a pelletizer to form pellets; wherein, the weight ratio of iron ore to coal particles and additives (sodium carbonate and quartz powder) is 10:4:1.

[0053] 2) Laying the pellets on a trolley, sending them into a tunnel kiln (direct reduction furnace), heating to 1200°C, and keeping for 40 minutes to obtain a reduced material containing elemental iron;

[0054] 3) T...

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Abstract

The invention discloses a metal reduction method, comprising the following steps: manufacturing a mixed material containing metal to a group or a block; and then heating to a predetermined temperature to carry out reduction reaction. The mixed material containing metal comprises a mineral containing metal and a reducing agent; and the particle diameter of the reducing agent is above 1mm. The metal reduction method has the advantages of fast reaction speed, low reaction temperature and low energy consumption.

Description

technical field [0001] The invention relates to the technical field of metal extraction, in particular to a metal reduction method. Background technique [0002] Metal is an important material in modern industrial production. Most metals are extracted from metal-bearing minerals through certain processes and equipment. In today's metal smelting process, it is more common to use a reducing agent to reduce metal-containing minerals by heating to a certain temperature and after a certain reduction time to obtain metals. For example, in the ironmaking process, the common direct reduction method is to mix iron-containing ore with coal as a reducing agent, heat it to a certain temperature, and the iron will be reduced without melting. In this process, it is generally believed that the smaller the particle size of the coal, the better, preferably less than 1mm, so that the coal can be fully contacted with the iron ore, and the iron can be fully reduced. , due to the small partic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B5/02
Inventor 李柏荣
Owner QIANQIU ENERGY SHANGHAI
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