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Iron ore concentrate for increasing low-temperature reduction pulverization rate of iron ore sinter and preparation method

A technology for iron ore concentrate and sintered ore, which is applied in the field of iron ore concentrate for improving the low-temperature reduction and pulverization rate of iron ore sintering ore, can solve the problems of high cost, high operation difficulty, increased operation difficulty, etc., and achieves improvement of blast furnace charging capacity. The effect of quality, low temperature reduction and pulverization improvement, and simple operation

Inactive Publication Date: 2021-02-02
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Layered fabrics are carried out, and the fuel ratio and type of each layer are different. Compared with the current sintering process, equipment such as layered fabrics needs to be significantly modified. In addition, each layer needs to be sprayed with a special pulverization inhibitor, which also increases the cost. Difficult to operate, there are problems such as difficult operation, high cost, and limited promotion
Therefore, in the prior art, there are still few industrial application examples of improving the low-temperature reduction pulverization performance of iron ore sinter

Method used

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  • Iron ore concentrate for increasing low-temperature reduction pulverization rate of iron ore sinter and preparation method
  • Iron ore concentrate for increasing low-temperature reduction pulverization rate of iron ore sinter and preparation method

Examples

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preparation example Construction

[0027] A method for preparing iron ore concentrates for improving the low-temperature reduction pulverization rate of iron ore sinters, comprising the following steps:

[0028] S1: the sintering raw material iron ore powder, flux and fuel are mixed once in the batching room of the sintering process;

[0029] S2: add water to the mixed raw materials in step S1, mix and granulate;

[0030] S3: cloth is carried out ignition sintering on the sintering machine;

[0031] S4: the finished ore obtained in step S3 is cooled by air blast and sieved by size to obtain ordinary sintered ore;

[0032] S5: The material that does not form mineral after sintering in step S3, returns to ore and enters step S1 to continue the cycle of steps S1-S4.

[0033] The flux is mixed with one or more of limestone, quicklime and dolomite in a certain proportion.

[0034] The fuel is mixed with one or more of coke powder and anthracite clean coal in a certain proportion.

[0035] The sinter sample was t...

Embodiment 1

[0047] The iron ore concentrate provided by the present invention is mainly composed of the following components in terms of mass fraction: Fe 2 o 3 : 57.83%, FeO: 16.29%, CaO: 1.47%, SiO 2 : 8.23%, Al 2 o 3 : 1.28%; MgO: 3.14%; BaO: 0.85%, MnO: 1.28%, and the burning loss is 8.48%.

[0048] In terms of mass fraction, 5% iron concentrate and 75% iron ore powder are mixed to form a mixture, and the sintering raw material is composed of mixture: 80%, flux: 15% and fuel: 5%.

[0049] The particle size of iron concentrate is not more than 0.09mm, and the content of particles with a particle size of less than 0.074mm is 90%.

[0050] A method for preparing iron ore concentrates for improving the low-temperature reduction pulverization rate of iron ore sinters, comprising the following steps:

[0051] S1: the sintering raw materials are mixed once in the batching chamber of the sintering process;

[0052] S2: add water to the mixed raw materials in step S1, mix and granulate; ...

Embodiment 2

[0060] Compared with Example 1, the present invention differs in that the ratio of iron concentrate to sintering raw materials is changed to 20%, the ratio of iron ore powder to sintering raw materials is changed to 60%, and the contents of other components remain unchanged.

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Abstract

The invention discloses iron ore concentrate for increasing the low-temperature reduction pulverization rate of iron ore sinter and a preparation method. The iron ore concentrate is prepared from thefollowing components in percentage by mass: 55%-60% of Fe2O3, 15.5%-17.5% of FeO, 1%-2% of CaO, 7%-9% of SiO2, 1.1%-1.3% of Al2O3, 3.0%-4.0% of MgO, 0.8%-1.0% of BaO, 1.2%-1.5% of MnO and 8.0%-10.0% of burning loss. Compared with the prior art, the low-temperature reduction pulverization rate RDI (+ 3.15 mm) of the sinter can be increased by 30%-40%, the blast furnace charging quality is remarkably improved, and smooth operation of a blast furnace is facilitated. In addition, the iron ore concentrate is directly added into iron ore powder to form a sintering raw material together with flux andfuel, no additive needs to be additionally added, no equipment needs to be modified, and the method for improving the sinter charging quality is easy to operate and easy to apply and popularize.

Description

technical field [0001] The invention belongs to the technical field of iron ore sintering in the iron and steel industry, and mainly relates to an iron concentrate and a method for improving the low-temperature reduction pulverization rate of iron ore sintering. Background technique [0002] The low-temperature reduction pulverization performance of sinter refers to the characteristics of iron ore fragmentation and pulverization during the low-temperature reduction process. The main reason for the reduction and pulverization of sintered ore after being loaded into the blast furnace at a low temperature of 400°C to 600°C is that the skeletal crystalline hematite (also known as regenerated hematite) undergoes lattice transformation at low temperature reduction (by αFe 2 o 3 Convert to γFe 2 o 3 During the process from hexagonal lattice to cubic lattice), a great internal stress is generated, which leads to the fragmentation of sintered ore. In the shaft furnace direct red...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16C22B1/24
CPCC22B1/16C22B1/24
Inventor 吴有文杨斌陈亚团
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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