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Method for making sintering bed charge by returning mine at high mixture ratio

A bottom material and ore-returning technology, which is applied in the field of ironmaking raw materials, can solve the problems of sinter reduction, energy consumption, and sinter utilization rate reduction, and achieve the effects of increasing sintering productivity, reducing production costs, and reducing fuel consumption

Active Publication Date: 2013-04-10
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) The returned ore has not been effectively utilized, and the ingredients can only be added again, which requires energy consumption, resulting in a waste of resources and energy
[0007] (2) In sintering production, excessive proportioning of returned ore will result in a decrease in actual sintered ore entering the furnace and lower utilization rate of sintered ore
[0008] (3) Using the finished sinter as the base material not only wastes resources, but also reduces production efficiency and increases the production cost of sinter

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Various raw materials are prepared according to the following mass percentage proportions: 50% of sintered ore return, 35% of fine-grained iron scale, 5% of iron-containing sludge, and 10% of bentonite and starch. Stir and mix the returned ore, iron-containing sludge, fine-grained iron scale, bentonite and starch (55% bentonite and 45% starch by weight). Put the mixed material into a roller briquetting machine for briquetting, the size of the briquette is 15mm×15mm×30mm, and finally dry and roast. The detected grade of the obtained briquette is 56% TFe, 6.70% FeO, and the low-temperature reduction pulverization rate (less than 0.5mm) of the briquette after drying is 5.44%.

Embodiment 2

[0021] Various raw materials are prepared according to the following mass percentage proportions: 60% of sintered ore, 20% of fine-grained iron scale and iron sheet, 15% of iron-containing sludge, and 5% of bentonite and starch. The returned ore, iron-containing sludge, fine-grained iron scale and iron sheet, bentonite and starch (40% bentonite and 60% starch by weight) are stirred and mixed. Put the mixed material into a roller briquetting machine for briquetting, the size of the briquette is 15mm×15mm×30mm, and finally dry and roast. The detected grade of the obtained briquette is 55.2% for TFe, 7.90% for FeO, and the low-temperature reduction pulverization rate (less than 0.5mm) of the briquette after drying is 8.56%.

Embodiment 3

[0023] The various raw materials are mixed according to the following mass percentages: 75% of sintered ore, 15% of fine-grained iron scale, iron sheet and high-grade concentrate powder, 5% of iron-containing sludge, and 5% of bentonite and starch. The returned ore, iron-containing sludge, fine-grained iron scale, iron sheet, high-grade concentrate powder, bentonite and starch (25% bentonite and 75% starch by weight) are stirred and mixed. Put the mixed material into a roller briquetting machine for briquetting, the size of the briquette is 15mm×15mm×30mm, and finally dry and roast. The detected grade of the obtained briquette is 54% TFe, 9.60% FeO, and the low-temperature reduction pulverization rate (less than 0.5mm) of the briquette after drying is 9.34%.

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PUM

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Abstract

The invention discloses a method for making a sintering bed charge by returning mine at a high mixture ratio. The method comprises the following steps of: mixing 50-75 percent by mass of sintering return mine serving as a major raw material with 10-35 percent by mass of high-grade fine particle iron-containing material, 5-20 percent by mass of iron-containing sludge and 5-10 percent by mass of bonding agent, and stirring; pressing a mixture into blocks on a ball press; and drying and baking to obtain the sintering bed charge. The high-grade fine particle iron-containing material is one or more of sheet iron, steel scale and high-grade concentrate fines, and the content of the material of which the granularity is less than 0.074 millimeters is over 85 percent. The bonding agent consists of 25-55 percent by weight of bentonite and 45-75 percent by weight of starch. The sintering productivity rises, the fuel consumption in a sintering procedure is lowered, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of ironmaking raw material production, relates to the production technology of sintered ore, and in particular relates to a method for manufacturing sintered ore bottoming material by adopting high ratio of returning ore. Background technique [0002] In ironmaking production, return ore is the under-screen product after sieving in the sintering and granulation process, which is composed of small particles of sintered ore and a part of unburnt raw meal. Its particle size ranges from 0 to 5mm. Because of its small particle size, it will seriously affect the air permeability of the blast furnace, so it is usually returned to the sintering plant for re-batch production, and the appropriate amount of returned ore can improve the air permeability of the sinter layer and promote low The formation of liquid phase at melting point and the improvement of desulfurization rate, so in the current conventional pellet sin...

Claims

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Application Information

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IPC IPC(8): C22B1/00C22B1/16
Inventor 刘杰周明顺翟立委王再义张辉
Owner ANGANG STEEL CO LTD
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