Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of 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: 2021-04-13
内蒙古赛思普科技有限公司
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of iron ore powder pretreatment process

Examples

Experimental program
Comparison scheme
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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A pretreatment process for iron ore powder, comprising the following steps: premix the iron ore powder and flux; after the mixture is evenly mixed, the mixture enters a ball mill for ball milling and secondary mixing, and the processed mixture passes through the air lock feeding valve Feed into the chute at the end of the rotary kiln, enter the rotary kiln, pass through the drying belt and preheating belt in the kiln; the hot ore preheated to 400-800 ℃ enters the tunnel kiln from the kiln head of the rotary kiln, and mixes coal powder in the tunnel kiln Pre-reduction is carried out, and the pre-reduced materials are lifted by the bucket elevator and then unloaded. This method adopts rotary kiln and tunnel kiln to realize the preheating and pre-reduction of iron-containing raw materials, so that the iron-containing raw materials can reach a certain degree of reduction. There will be no reduction reaction without adding coal powder or reducing gas such as CO into the rotary kiln. It can effectively reduce the occurrence of ring formation in the rotary kiln.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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