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Method for improving quality of sintering ore produced by fine-sized iron ore powder

A technology for sintering ore and iron ore powder, which is applied in the field of improving the quality of sintering ore produced by fine-grained iron ore powder production, can solve problems such as difficulty in producing sintering ore, and achieve the advantages of increasing particle size and thickness, increasing sintering negative pressure, and improving quality. Effect

Active Publication Date: 2015-11-18
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the disadvantage that the existing fine-grained iron ore powder is difficult to produce sinter, the present invention provides a method for improving the quality of sinter produced by fine-grained iron ore powder. The proportion of high-grade sinter (10~5mm) is beneficial to the use of blast furnace

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: Baseline Example (Prior Art)

[0039] This benchmark example is a conventional iron ore powder sinter production technology, the material layer is relatively thick and the sintering negative pressure is relatively low.

[0040] Conventional production of sinter from iron ore concentrate includes the following steps:

[0041] (1) Ingredients

[0042] The shares of iron ore concentrate powder, flux and solid fuel used in the production of sintering ore are as follows:

[0043] 30 parts of magnetite concentrate powder

[0044] 39 parts of hematite concentrate powder

[0045] 11 parts of blast furnace return ore powder

[0046] Dolomite powder 7 parts

[0047] 8 parts white ash

[0048] 5 parts of pulverized coal

[0049] Among them, the magnetite concentrate powder is Loufan County magnetite concentrate powder, and the hematite concentrate powder is Lanxian County hematite grains. The proportion of magnetite concentrate powder with a particle size of les...

Embodiment 2

[0058] In this embodiment, the height of the sintering fence, the negative pressure of sintering, and the particle size and thickness of the primer are adjusted. The specific production steps are:

[0059] (1) Adjust the height of the sintering fence: reduce the height of the sintering fence from 700mm to 650mm during sintering;

[0060] (2) Adjust the sintering negative pressure: the sintering negative pressure is increased from 9500Pa to 11000Pa during sintering;

[0061] (3) Adjust the particle size and thickness of the bottom layer sinter: adjust the particle size of the bottom layer sinter from 10~16mm to 12~18mm, and adjust the thickness from 20~40mm to 25~45mm.

[0062] (4) Ingredients

[0063] Raw material proportioning is with embodiment 1.

[0064] (5) Mix well

[0065] After the above mixture is added with water, it is mixed by primary and secondary mixers to obtain a mixture with a water content of about 8.2%.

[0066] (6) Sintering

[0067] Distribute the ab...

Embodiment 3

[0070] In this embodiment, further adjustments are made to the height of the sintering fence, the negative pressure of sintering, and the particle size and thickness of the primer. The specific production steps are:

[0071] (1) Adjust the height of the sintering fence:

[0072] Reduce the height of the sintered fence from the original 700mm to 600mm;

[0073] (2) Adjust the sintering negative pressure:

[0074] Raise the sintering negative pressure from 9500Pa to 11500Pa.

[0075] (3) Adjust the particle size and thickness of the sintered ore of the bottom layer:

[0076] Adjust the particle size of the bottom layer sinter from the conventional 10-16mm to 12-18mm, and adjust the thickness from 20-40mm to 25-45mm.

[0077] (4) Ingredients

[0078] Raw material proportioning is with embodiment 1.

[0079] (5) Mix well

[0080] After the above mixture is added with water, it is mixed by primary and secondary mixers to obtain a mixture with a water content of about 8.2%.

...

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Abstract

The invention discloses a method for improving quality of sintering ore produced by fine-sized iron ore powder. The method comprises the following steps: (1) regulating height of a sintering breast board: reducing the height of the sintering breast board by 50-100 mm during sintering; (2) regulating sintering negative pressure: rising the sintering negative pressure to 1500-2000Pa; and (3) regulating grain size and thickness of a bedding material sintering ore: increasing the grain size of the bedding material sintering ore to 2mm and increasing the thickness of the bedding material sintering ore to 5mm. According to the method disclosed by the invention, the quality of the sintering ore is improved, and the proportion of 5-10mm small-sized sintering ore in the sintering ore is reduced.

Description

technical field [0001] The invention relates to a method for improving the quality of sintered ore produced from fine-grained iron ore powder, and belongs to the technical field of sintered ore production. Background technique [0002] Iron concentrate powder is a raw material for sinter production. During the sinter production process, iron concentrate powder is mixed with fine ore, flux, and solid fuel in a certain proportion, and then sintered by a sintering machine to produce sinter that meets the needs of the blast furnace. . In the past domestic sinter production process, iron ore concentrate powder was added to the sinter mixture in a small proportion. Due to its fineness, if it is added in a large proportion, it will affect the air permeability of the sinter mixture, resulting in the sinter mixture not being able to Burning through will eventually affect the quality of sinter ore and other indicators. However, due to the sharp rise in the price of imported ore powd...

Claims

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Application Information

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IPC IPC(8): C22B1/16
Inventor 范建军赵建伟蔡湄夏贺淑珍张华李昊堃
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD