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Iron ore powder pretreatment process

An iron ore powder and pretreatment technology, applied in the field of iron and steel metallurgy, can solve the problems of unstable continuous production, high failure rate of fluidized bed process, frequent failure of preheating system, etc. Applicable range of particle size and large processing capacity

Active Publication Date: 2019-12-20
内蒙古赛思普科技有限公司
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  • Application Information

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Problems solved by technology

[0003] The traditional HIsmelt smelting reduction preheating pre-reduction process uses a fluidized bed as the pretreatment process for iron ore powder. The high failure rate of the fluidized bed process makes the whole process unable to be stable and continuous.
There are problems such as cohesion and loss of iron-containing raw materials, frequent failures of the preheating system, resulting in low equipment operation rate. In view of the technical problems of iron ore powder preheating and pre-reduction during the operation of HIsmelt, the invention provides an iron ore powder pretreatment The process improves the stability of the process, which can effectively reduce the occurrence of ring formation in the rotary kiln, and the materials can be fully reduced in the tunnel kiln

Method used

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  • Iron ore powder pretreatment process

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Effect test

Embodiment 1

[0025] A kind of iron ore powder pretreatment process, concrete process step is:

[0026] (1) Iron ore powder is crushed and sieved into powder less than 6mm, and flux quicklime powder is broken and sieved into powder less than 3mm. The chemical composition of iron ore powder and quicklime powder is as shown in Table 1 and Table 2:

[0027] The main chemical composition (%) of table 1 iron ore fines

[0028] Element TF SiO 2

Al 2 o 3

P S water +6.3mm index 62.5 4.3 2.0 0.08 0.03 5 ≤12.0

[0029] The main chemical composition (%) of quicklime powder of table 2

[0030] raw material CaO MgO SiO 2

P S quicklime powder ≥85 ≤5 ≤3.5 ≤0.05 ≤0.15

[0031] (2) Then the iron ore powder and the flux are mixed according to the ratio of 8:1, and then enter the mixer for premixing and strong mixing.

[0032] (3) After the mixture is uniform, the mixture enters the ball mill for ball milling and secondary ...

Embodiment 2

[0042] A kind of iron ore powder pretreatment process, concrete process step is:

[0043] (1) Iron ore powder is crushed and sieved into powders less than 6mm, and flux quicklime powder is broken and sieved into powders less than 3mm. The chemical composition of iron ore powder and quicklime powder is as shown in Table 3 and Table 2:

[0044] The main chemical composition (%) of table 3 iron ore fines

[0045] Element TF SiO 2

Al 2 o 3

P S FeO CaO index 62.39 3.86 2.24 0.08 0.01 0.38 0.08 MgO K 2 o

TiO 2

ZnO mn V Cl 0.11 0.02 0.07 ＜0.01 0.07 ＜0.01 0.01

[0046] (2) Then the iron ore powder and flux are mixed according to the ratio of 6:1, and then enter the mixer for premixing and strong mixing.

[0047] (3) After the mixture is uniform, the mixture enters the ball mill for ball milling and secondary mixing, so that the mixture is further ground and mixed evenly. The main purpose is to mix ev...

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Abstract

An iron ore powder pretreatment process comprises the following steps of premixing iron ore powder and flux; feeding the mixtures uniformly mixed into a ball mill for ball milling and secondary mixing, and feeding the treated mixtures into a chute at the tail of a rotary kiln through a locking feeding valve, so that the mixtures enter the rotary kiln, and pass through a drying belt and a preheating belt; feeding hot ores heated to 400 DEG C-800 DEG C to a tunnel kiln from the head of the rotary kiln, and adding coal powder to the tunnel kiln for prereduction; lifting the prereduced materials,and then discharging the materials. According to the process, the preheating and prereduction of iron-containing raw materials are achieved through the rotary kiln and the tunnel kiln, so that the iron-containing raw materials reach a certain reduction degree; and no reduction reaction occurs if the coal powder is not added to or CO and other reducing gases are not introduced into the rotary kiln,and the ringing phenomenon in the rotary kiln can be reduced effectively.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to an iron ore powder pretreatment process, in particular to an iron ore powder temperature raising pre-reduction pretreatment process system. Background technique [0002] The smelting reduction method refers to any method that does not use the blast furnace method to produce molten iron, uses non-coking coal as the main energy source, uses raw materials such as lump ore, pellet ore or directly uses iron ore powder, and uses carbon to reduce iron oxides in a high-temperature molten state A method of smelting metal iron. Its development purpose is to partially replace the traditional blast furnace ironmaking method. [0003] The traditional HIsmelt smelting reduction preheating pre-reduction process uses a fluidized bed as the iron ore powder pretreatment process. The high failure rate of the fluidized bed process makes the whole process unable to be stable and continuous. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/00
CPCC21B13/0006C21B13/008C21B13/0086Y02P10/20
Inventor 卜二军张志祥徐涛张勇周海川刘志国
Owner 内蒙古赛思普科技有限公司