Sintering method with part of return mine being sintered without pelletization being pelletized

A sintering method and unmanufactured technology, applied in the field of iron ore powder sintering, can solve the problems of poor granulation effect, granulation damage, unfavorable sintering material layer permeability, etc. The effect of improving the granulation effect

Active Publication Date: 2014-04-30
SHOUGANG CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the amount of returned ore is large, the granulation in the mixer may be damaged, and the small-grained materials cannot be gathered on the large-grained materials

Method used

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  • Sintering method with part of return mine being sintered without pelletization being pelletized
  • Sintering method with part of return mine being sintered without pelletization being pelletized
  • Sintering method with part of return mine being sintered without pelletization being pelletized

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Experimental program
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Effect test

Embodiment 1

[0030] 1) Sintering raw material equipment, the sintering raw material includes: iron ore powder 53.6%, returned ore 36.3%, quicklime 2.1%, dolomite 2%, limestone 2.5%, coke powder 3.5%, see Table 1.

[0031] 2) Separation of returned ore: Among the sintering raw materials provided, 7.5% of the total mass of returned ore is taken out for use in subsequent processes. This returned ore is all blast furnace returned ore.

[0032] 3) Mixing: Transport all the remaining sintering raw materials to the primary cylinder mixer, add 6.0% of the total mass of the remaining sintering raw materials to wet the sintering raw materials, and mix the sintering raw materials with water evenly, and the particle size of the obtained mixture is The composition is shown in Table 2.

[0033] 4) Granulation: Transport the wetted and uniformly mixed sintered raw materials to the secondary cylinder mixer for remixing and granulation. The granulation time is 4 minutes; then add 7.5% of the pre-extracted ...

Embodiment 2

[0041] 1) Sintering raw material equipment, the sintering raw material includes: iron ore powder 53.6%, returned ore 36.3%, quicklime 2.1%, dolomite 2%, limestone 2.5%, coke powder 3.5%, see Table 1.

[0042] 2) Separation of returned ore: Among the sintering raw materials provided, 22% of the total mass of returned ore is taken out for use in subsequent processes. Among them, the composition of the returned ore taken out is 7.5% blast furnace returned ore and 14.5% sintered self-returning ore.

[0043] 3) Mixing: Transport all the remaining sintering raw materials to the primary cylinder mixer, add 6.5% of the total mass of the remaining sintering raw materials to wet the sintering raw materials, and mix the sintering raw materials with water evenly, and the particle size of the obtained mixture is The composition is shown in Table 2.

[0044] 4) Granulation: Transport the wetted and uniformly mixed sintered raw materials to the secondary cylinder mixer for remixing and gran...

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Abstract

The invention provides a sintering method with a part of return mine being sintered without being pelletized. The method comprises the following steps: batching; material mixing; secondary mixing for pelletization; material distributing; igniting; sintering; crushing and cooling; screening; index detecting for agglomerate. The sintering raw materials prepared in step of batching comprise the following materials: 40-80% of hematite, 5-50% of return mine, 0-10% of quicklime, 0-10% of dolomite, 0-10% of limestone and 3-8% of coke powder; before the step of material mixing, 3-50% of the return mine is taken out, and directly added in the sintering raw materials after the secondary mixing for pelletization without participating in the steps of material mixing and the secondary mixing for pelletization. The method can improve pelletization effect and sintering air permeability, and utilization coefficient of sintering.

Description

technical field [0001] The invention belongs to the technical field of iron ore powder sintering, in particular to a sintering method in which part of the ore is returned to sintering without granulation. Background technique [0002] Return ore is the sintering process, iron ore powder, flux, coke powder and other materials are agglomerated at high temperature to form sintering ore, and the sintering ore is produced after cooling, crushing, transfer, screening and other processes. The particle size of the returned ore is less than 5mm or 6.3mm; after the sintered ore is under the sieve of the blast furnace, there is also a part of the returned ore, which is called the blast furnace returned ore. Both the sintering self-returning and the blast furnace returning ore participate in the sintering ingredients for cyclic sintering. The return rate is an important indicator reflecting the overall level of the sintering plant. Reducing the return rate is an important means to inc...

Claims

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Application Information

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IPC IPC(8): C22B1/16
Inventor 裴元东安钢熊军赵志星马泽军张卫东石江山康海军王全乐史凤奎程铮明王洪江潘文赵勇秦岳义许树生罗尧升霍吉祥张贺顺王晓鹏梁小明
Owner SHOUGANG CORPORATION
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