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Method and system for improving air permeability of iron ore sintering mixture

A technology for sintering mixtures and iron ore, which is applied in the field of iron ore sintering, can solve the problems of poor air permeability of the material layer, low sintering speed, and poor physical and chemical properties, so as to improve air permeability, porosity, and effect of thickness

Active Publication Date: 2017-09-15
MCC CAPITAL ENGINEERING & RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the sintered material layer reaches a certain thickness, the gas permeability of the material layer will deteriorate, the sintering speed will decrease, and the physical and chemical properties will deteriorate due to over-melting of the sintered ore in the lower layer.

Method used

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  • Method and system for improving air permeability of iron ore sintering mixture
  • Method and system for improving air permeability of iron ore sintering mixture
  • Method and system for improving air permeability of iron ore sintering mixture

Examples

Experimental program
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Embodiment 1

[0037] The embodiment provides a system (such as figure 1 shown).

[0038] The system includes a batching unit 1, a mixing unit 2, a granulation unit 3, a briquetting unit 4 and a sintering unit 5; wherein, the inlet of the mixing unit 2 is connected to the outlet of the batching unit 1, and the outlet of the mixing unit 2 is respectively connected to the granulation unit The inlet of 3 is connected with the inlet of briquetting unit 4; the outlet of granulation unit 3 and the outlet of briquetting unit 4 are respectively connected with the inlet of sintering unit 5;

[0039] A distributing device is provided at the exit of the mixing unit 2 which communicates with the granulating unit 3 and the briquetting unit 4 respectively; the distributing device can be a three-way distributor, a material distribution box or a plow unloader.

[0040] The batching unit 1 is equipped with a belt scale or a screw scale for weighing iron ore sintering raw materials;

[0041] The mixing unit...

Embodiment 2

[0046] The embodiment provides a system (such as figure 2 shown), the system is further improved on the basis of the system provided in Example 1.

[0047] On the basis of the system provided in Embodiment 1, the system may also include a water injection unit 10, the water injection unit 10 is respectively connected to the inlet of the mixing unit 2 and the inlet of the granulation unit 3;

[0048] The system can also include an auxiliary agent adding unit 11; the outlet of the auxiliary agent adding unit 11 is connected with the inlet of the briquetting unit 4;

[0049] The system can also include a steam injection unit 9, the outlet of the steam injection unit 9 is connected to the granulation unit 3 and the sintering unit 5 respectively;

[0050]The sintering unit 5 may include a buffer bin, an ignition device 8, an air injection device 6, a gas injection device 7, and a distribution device; wherein, the outlet of the steam injection unit 9 is connected to the inlet of th...

Embodiment 3

[0052] This embodiment provides a method for improving the air permeability of the iron ore sinter mixture (flow process is as follows image 3 shown), the method adopts the system provided in embodiment 2, and mainly includes the following steps:

[0053] Use batching unit 1 to weigh and prepare iron ore sintering raw materials, which include iron ore powder, flux, fuel and cold return ore; then transported to mixing unit 2 by belt conveyor for mixing. Water injection unit 10 adds water to the material;

[0054] After mixing, 50wt% of the material is separated into the briquetting unit 4 by the material distributing device and pressed into agglomerates with a diameter of 8 cm; the rest of the material enters the granulation unit 3 for granulation. add water to the material;

[0055] The briquetted material and the granulated material are transported together to the sintering unit 5 for sintering to obtain the finished product. During sintering, the sintering negative pressu...

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Abstract

The invention discloses a method and a system for improving the air permeability of an iron ore sintering mixture. The method comprises the following steps: preparing iron ore sintering raw materials, mixing the iron ore sintering raw materials, separating 10 to 50 weight percent of a material from the mixture for briquetting, and granulating other materials; and sintering the briquetted material and the granulated materials. The system comprises a burdening unit, a mixing unit, a granulation unit, a briquetting unit and a sintering unit, wherein an inlet of the mixing unit is connected with an outlet of the burdening unit; an outlet of the mixing unit is connected with an inlet of the granulation unit and an inlet of the briquetting unit; an outlet of the granulation unit and an outlet of the briquetting unit are respectively connected with an inlet of the sintering unit. According to the technical scheme provided by the invention, the average particle size of the sintering mixture can be effectively increased, and the air permeability index of the mixture is increased; and therefore, a sintering material layer can be heightened to 800 to 1,000 mm, and the production efficiency of sintering is effectively improved.

Description

technical field [0001] The invention relates to a method and system for improving the air permeability of iron ore sintering mixture, belonging to the technical field of iron ore sintering. Background technique [0002] Thick layer low temperature sintering technology is an advanced sintering technology that has been widely used in recent years. Based on the theory of calcium ferrite consolidation and the automatic heat storage effect of the sintering process, thick material layer sintering can reduce solid fuel consumption, reduce carbon oxide emissions, reduce the thickness of the combustion zone, reduce the ferrous content of sintered ore, and promote the formation of calcium ferrite. generation, improving the mineral structure of sinter, increasing the strength of sinter, increasing the yield of sinter and so on. However, when the sintered material layer reaches a certain thickness, the air permeability of the material layer will deteriorate, the sintering speed will de...

Claims

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Application Information

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IPC IPC(8): C22B1/16C22B1/24
CPCC22B1/16C22B1/2406
Inventor 范振宇李学俭高景栋王介超陈慧艳胡林孙娜李文琦黄强
Owner MCC CAPITAL ENGINEERING & RESEARCH
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