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Method for sintering iron ore powder with super high material layer

A technology of iron ore powder and material layer, which is applied in the field of sintered iron ore powder, can solve the problem of difficult material layer thickness, achieve the effects of improving material layer air permeability, saving solid fuel consumption, and improving sintering utilization coefficient

Inactive Publication Date: 2007-09-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large number of production practices show that it is very difficult to further increase the thickness of the material layer under the existing sintering production process conditions

Method used

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  • Method for sintering iron ore powder with super high material layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Embodiment 1, referring to the accompanying drawings, separate out the fine-grained iron ore powder that accounts for 70% of the total mass of the iron-containing raw materials and whose particle size is less than 0.1mm in the iron-containing raw materials, and mixes 1.5% of them with a particle size smaller than 0.074mm in mass percentage 80% of finely ground quicklime, 0.5% of 90% of finely ground coke powder with a particle size of less than 0.074mm, and 1.2% of bentonite, mix well, and after moistening and grinding, prepare green pellets of 7-12mm in a disc pelletizer 5.0% coke powder, 7.0% quicklime, and 5.0% dolomite are added to the coarse-grained iron-containing raw materials with a particle size greater than 0.1mm, which account for 30% of the total mass of iron-containing raw materials. After mixing, combine with raw pellets, carry out secondary mixing in a cylinder mixer to prepare secondary mixture, cloth, ignite, and sinter by ventilating. The sintering neg...

Embodiment 2

[0011] Example 2, referring to the accompanying drawings, separate out the iron-containing raw materials that account for 50% of the total mass of iron-containing raw materials and have a particle size of less than 0.1mm. % of finely ground quicklime, 1.2% of the particle size is less than 0.074mm, accounting for 80% of finely ground coke powder and 0.5% of bentonite, mixed evenly, and after moistening and grinding, prepare green pellets of 8-12mm in a disc pelletizer; the rest 4.8% of coke powder, 7.0% of limestone, and 3.5% of dolomite are added to the coarse-grained iron-containing raw materials with a particle size greater than 0.1 mm, accounting for 50% of the total mass of iron-containing raw materials, and sintered and returned ore is added. After mixing once, it is mixed with raw The pellets are combined together, and are mixed twice in a cylinder mixer to prepare a secondary mixture, clothed, ignited, and sintered by ventilation. The sintering negative pressure is 10k...

Embodiment 3

[0012] Example 3, referring to the accompanying drawings, separate out the fine-grained iron ore powder that accounts for 30% of the total mass of the iron-containing raw materials and whose particle size is less than 0.1mm, and mixes 0.5% of the iron ore powder with a particle size of less than 0.074mm by mass percentage. Finely ground quicklime, 1.5% finely ground coke powder with a particle size of less than 0.074mm and 1.5% bentonite, mixed evenly, after high-pressure roller milling, prepared into green pellets of 7-12mm in a disc pelletizer; the rest accounted for iron-containing Add 3.5% coke powder, 5.5% limestone, and 5.0% dolomite to the coarse-grained iron-containing raw materials with a particle size greater than 0.1mm in 70% of the total amount of raw materials, add sintered and returned ore, and combine them with green pellets after mixing once , Prepare secondary mixture through secondary mixing in a cylinder mixer, cloth, ignite, and sinter with ventilation. The...

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Abstract

The invention disclose a method for obtaining ultra high batch layer sintering hematite by improving the thickness of iron ore sintering batch layer. The granule part of less than 0.1mm difficult to pelletize in the tradical art are branched off, separate treating to preparing a green pellets of 7-12mm, then adding to the mix processed by more than 0.1mm coarse ironstone, distributing, igniting, induced draft sintering according to the tradical art, cooling, pelletizing to obtain a sintering mine for refined iron for blast furnace. The air permeability of batch layer is improved in case that a great deal of air-channaels is formed between pellets made of fineiron ore and other the mix, accordingly the thichness of sintering batch layer can be 900-1100mm in case that sintering induced draft negative pressure is not increased, and abtain ultra high batch layer sintering hematite.

Description

technical field [0001] The invention relates to a method for sintering iron ore powder, in particular to a method for increasing the thickness of iron ore sintering material layer to realize ultra-high material layer sintering. Background technique [0002] High material layer sintering can significantly improve the output and quality indicators of sintered ore, and at the same time can greatly reduce the energy consumption of sintered solids. Production practice shows that for every 100mm increase in the sinter layer, the drum index of the finished sintered ore can be increased by about 1.5% to 2.5%, and the solid fuel consumption can be reduced by about 10kg / t-sintered ore. Therefore, adopting high material layer sintering and increasing the thickness of the sintered material layer as much as possible has become the goal pursued by many sintering plants at home and abroad. [0003] However, if the air permeability of the sintered material layer is not improved, as the thi...

Claims

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Application Information

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IPC IPC(8): C22B1/14
Inventor 李光辉姜涛范晓慧郭宇峰许斌杨永斌朱忠平张元波刘牡丹董海刚黄柱成白国华陈耀铭
Owner CENT SOUTH UNIV
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