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Method for inhibiting low-temperature reduction degradation of sintering ore of iron ore

A sinter and low-temperature technology, applied in the field of iron and steel metallurgy, can solve the problems of poor performance of low-temperature reduction and pulverization of iron ore sinter, and achieve the effects of improved product strength, perfect crystallization, and increased strength

Active Publication Date: 2015-03-11
CENT SOUTH UNIV
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Problems solved by technology

[0007] In order to solve the technical problem of poor low-temperature reduction pulverization performance of iron ore sinter, the present invention has developed a method capable of inhibiting low-temperature reduction pulverization of iron ore sinter, which has a significant effect on improving the low-temperature reduction pulverization performance of sinter

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Hematite concentrate (Fe in iron concentrate) in sintered iron-containing raw materials 2 o 3 The mass content is 95%) by adding 0.5% anthracite coal powder to prepare 3mm-15mm pellets, of which the 6mm-10mm particle size content is 60%;

[0036] (2) Then 2.25kg of iron concentrate, 14kg of iron ore powder, 1kg of coke powder, 1.2kg of quicklime, 0.8kg of limestone and 7kg of returned ore are mixed and granulated into a sintering mixture of 0.5mm to 8mm;

[0037] (3) Mix the granulation material and the sintering mixture according to the mass ratio of 20:80, cloth, sintering and roasting, in which the negative pressure of the sintering ventilation is controlled to 9kPa, the cooling negative pressure is 4kPa, and the cooling time is 8min.

[0038] The yield of the obtained sintered ore is 76.58%, the drum strength is 64.18%, and the utilization factor is 1.42t m -2 h -1 , solid fuel consumption is 46.74kg / t 烧结矿 , Low temperature reducing pulverization index RDI ...

Embodiment 2

[0040] (1) Hematite concentrate (Fe in iron concentrate) in sintered iron-containing raw materials 2 o 3 The mass content is 95%) by adding 1.0% anthracite coal powder to prepare 3mm-15mm pellets, of which the 6mm-10mm particle size content is 60%;

[0041] (2) Then 14kg of iron ore powder, 1kg of coke powder, 1.2kg of quicklime, 0.8kg of limestone and 7kg of returned ore are mixed and granulated into a sintering mixture of 0.5mm to 8mm;

[0042] (3) Mix the granulation material and the sintering mixture according to the mass ratio of 27:73, cloth, sintering and roasting, in which the negative pressure of the sintering ventilation is controlled to 9kPa, the cooling negative pressure is 4kPa, and the cooling time is 10min.

[0043] The yield of the obtained sintered ore is 80.58%, the drum strength is 65.79%, and the utilization factor is 1.58t m -2 h -1 , solid fuel consumption is 45.54kg / t 烧结矿 , Low temperature reducing pulverization index RDI +3.15 It was 86.74%.

Embodiment 3

[0045] (1) Hematite concentrate (Fe in iron concentrate) in sintered iron-containing raw materials 2 o 3 The mass content is 95%) by adding 0.75% anthracite powder to prepare pellets with a size of 3mm to 15mm, of which the content of 6mm to 10mm is 60%;

[0046] (2) Then 14kg of iron ore powder, 1kg of coke powder, 1.2kg of quicklime, 0.8kg of limestone and 7kg of returned ore are mixed and granulated into a sintering mixture of 0.5mm to 8mm;

[0047] (3) Mix the granulation material and the sintering mixture according to the mass ratio of 27:73, cloth, sintering and roasting, in which the negative pressure of the sintering ventilation is controlled to be 8kPa, the cooling negative pressure is 4kPa, and the cooling time is 8min.

[0048] The yield of the obtained sintered ore is 82.33%, the strength of the drum is 66.12%, and the utilization factor is 1.61t m -2 h -1 , solid fuel consumption is 45.23kg / t 烧结矿 , Low temperature reducing pulverization index RDI +3.15 It was...

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Abstract

The invention discloses a method for inhibiting the low-temperature reduction degradation of a sintering ore of an iron ore. The method comprises the following steps of: preparing an iron ore concentrate into a granulating material with certain granularity; mixing the granulating material with a sintering mixing material; and then distributing, sintering and roasting the mixture, wherein the negative pressure of air draft in the sintering and roasting process is decreased and the cooling speed of the sintering ore is slowed by adding a small amount of fusing agent or solid fuel is added into the granulating material and optimizing the usage amount of the solid fuel and the fusing agent in the sintering mixing material. Thus, the low-temperature reduction degradation of the sintering ore is obviously inhibited. As a result, the technical and economical index of blast furnace smelting is effectively improved.

Description

technical field [0001] The invention discloses a method for suppressing low-temperature reduction pulverization of iron ore sintered ore, which belongs to the technical field of iron and steel metallurgy. Background technique [0002] The low-temperature reduction pulverization index of iron ore sinter is one of the important indicators to measure its metallurgical performance, which has a significant impact on the gas permeability of the blast furnace material column, and is related to whether the blast furnace production is smooth or not. The reason for low-temperature reduction pulverization of sintered ore is that sintered ore contains a large amount of secondary hematite, especially skeletal rhombohedral hematite, which changes from trigonal hematite to equiaxed hematite during the reduction process. In magnetite, the lattice volume expands. Due to the complex composition of sinter, the expansion properties of various phases are very different, which leads to a huge cr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B1/26
Inventor 姜涛李光辉张元波余正伟饶明军郭宇峰范晓慧陈许玲杨永斌李骞许斌黄柱成朱忠平游志雄曾精华罗骏刘臣刘明霞周峰欧阳崇钟刘兵兵苏子键徐斌甘敏
Owner CENT SOUTH UNIV
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