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A kind of high-magnesium composite sinter and its production method

A production method and technology for sintering ore, applied in the field of iron smelting, can solve the problems of unreasonable mineral formation, high solid fuel consumption, insufficient resource utilization rate, etc., and achieve improved desulfurization and desulfurization effect, excellent comprehensive metallurgical performance, and reduced crushing processing. cost effect

Active Publication Date: 2019-11-29
胡明意
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is that the existing high-magnesium sinter production has insufficient resource utilization, unreasonable mineral formation, low output, poor strength, high return rate, and high solid fuel consumption.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1: Production of high-magnesium composite sinter

[0047] (1) Mix material A evenly, add water to moisten it, and form material A after intensive granulation; the particle size composition of the material A is as follows: 0-3mm particle size content is 15%, 3-5mm particle size content is 45% , the content of 5 ~ 10mm particle size is 30%, and the content of particle size above 10mm is 10%;

[0048] (2) First mix material B evenly, and then evenly arrange it on the sintering machine trolley, and then evenly arrange material A on material B, so that the material layer thickness of material B is 200mm, and the material layer thickness of material A is 900mm mm; Immediately ignite and draw air on the surface of material A, the sintering reaction starts, the ignition temperature is 1000-1050 ° C, the negative pressure of the draft is 13-17KPa; the negative pressure of ignition is 55% of the negative pressure of the draft, and the ignition time is 48 seconds. Afte...

Embodiment 2

[0053] Embodiment 2: Production of high-magnesium composite sinter

[0054] (1) Mix material A evenly, add water to moisten it, and form material A after intensified granulation; the particle size composition of the material A is as follows: 0-3mm particle size content is 10%, 3-5mm particle size content is 48% , the content of 5 ~ 10mm particle size is 32%, and the content of particle size above 10mm is 10%;

[0055] (2) Firstly lay the lump ore in material B evenly on the sintering machine trolley, then mix other materials in material B evenly, the resulting mixture is evenly laid on the lump ore, and then material A is evenly placed on material B First, make the material layer thickness of material B be 260 mm, and the material layer thickness of material A be 980 mm; then ignite and ventilate on the material surface of material A, and the sintering reaction starts. ~19KPa; the ignition negative pressure is 50% of the suction negative pressure, the ignition time is 46 seco...

Embodiment 3

[0059] Embodiment 3: Production of high-magnesium composite sinter

[0060] (1) Mix material A evenly, add water to moisten it, and form material A after intensified granulation; the particle size composition of the material A is as follows: 0-3mm particle size content is 8%, 3-5mm particle size content is 50% , the content of 5 ~ 10mm particle size is 32%, and the content of particle size above 10mm is 10%;

[0061] (2) First mix material B evenly, and then evenly arrange it on the sintering machine trolley, and then evenly arrange material A on material B, so that the material layer thickness of material B is 150mm, and the material layer thickness of material A is 800mm mm; Immediately ignite and draw air on the surface of material A, the sintering reaction starts, the ignition temperature is 1050-1100 ° C, the negative pressure of the draft is 12-16KPa; the negative pressure of ignition is 65% of the negative pressure of the draft, and the ignition time is 46 seconds. Aft...

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Abstract

The invention relates to high-magnesium composite sinter and a production method thereof. A high-magnesium fluxing agent and other raw materials are prepared, optimized and then sintered in a sinter bed, so that the problems that in terms of existing high-magnesium sinter production, resource utilization and mineral generation are unreasonable, the yield is low, the strength is low, the return mine rate is high, and the solid fuel consumption is high are solved. The high-magnesium composite sinter is formed by crushing and mixing sinter of upper and lower layer structures. With composite calcium ferrite as the main binder phase, the upper layer of sinter is formed by sintering a material A, wherein MgO accounts for not greater than 1.8%, and Al2O3 accounts for not greater than 2.0%; and the lower layer of sinter is formed by sintering a material B, and the content of MgO of the lower layer of sinter is greater than that of the MgO of the upper layer of sinter. The material A comprises72-90% of iron-containing mineral powder raw materials, 7-20% of a low-magnesium fluxing agent and 3-8% of a solid fuel; and the material B comprises 0-90% of sinter, 0-70% of sintering return mine and 10-100% of a high-magnesium fluxing agent. The high-magnesium composite sinter is good in comprehensive metallurgical performance, the blast furnace burden structure can be optimized easily, and theslag mobility and desulfuration and dealkalization effects can be improved.

Description

technical field [0001] The invention relates to the technical field of iron smelting, in particular to a high-magnesium composite sintered ore and a production method thereof. Background technique [0002] With the rapid development of my country's iron and steel industry, high-alkalinity sinter combined with acidic charge is currently recognized as an ideal form of blast furnace ironmaking charge structure. It can make full use of the advantages of high-alkaline sinter's excellent metallurgical properties and give full play to the high-grade and low-slag content of acidic charge Characteristics, blast furnace smelting can obtain good economic and technical indicators. [0003] The production of medium-acid pellets for iron raw materials in my country's iron-making blast furnaces lags behind the production of high-basic sinters. Blast furnace ironmaking in many iron and steel complexes has the disadvantages of large amount of high-basic sinter and insufficient supply of acid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/16C22B1/24
CPCC22B1/16C22B1/2406
Inventor 胡明意胡文方
Owner 胡明意
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