Iron ore well-blended powder with pelletizing undersize for reducing cost and improving efficiency

A technology of applying balls and pellets, applied in the field of iron ore mixing powder, can solve the problems of reduced sinter strength, poor reducibility, and increased ore return rate.

Inactive Publication Date: 2018-12-04
上海慧安科技股份有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an iron ore mixed powder that uses pellet crushing to reduce costs and increase efficiency, and to solve the problem of sinter strength caused by the by-product pellet crushing produced by the direct reduction iron process when it is applied to sintering production. Problems such as reduction, increase in return rate, poor reducibility, etc.

Method used

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  • Iron ore well-blended powder with pelletizing undersize for reducing cost and improving efficiency
  • Iron ore well-blended powder with pelletizing undersize for reducing cost and improving efficiency
  • Iron ore well-blended powder with pelletizing undersize for reducing cost and improving efficiency

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with embodiment.

[0037] The iron ore powder mixture composition and weight percentage of Embodiment 1-4 of the present invention are as shown in Table 2, and the chemical indicators of various iron ores in the mixture formula are as shown in Table 3, and each iron ore is intelligentized through use. Advanced mixing material processing equipment is used for batching and mixing production to obtain iron ore powder mixture.

[0038] The chemical indicators of each chemical element, compound and particle size in the iron ore powder mixture obtained in Examples 1-4 are shown in Table 4.

[0039] The composition of the sinter produced by using the mixed powder of Examples 1-4 is shown in Table 5. The blast furnace is equipped with 15% lump ore (TFe63%) and 10% pellets (TFe62%). The indicators after smelting are as follows: Table 6 shows.

[0040] The iron ore mixed powder product produced by the inventio...

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Abstract

The invention discloses an iron ore well-blended powder with pelletizing undersize for reducing cost and improving efficiency. The iron ore well-blended powder includes, by weight, 5-15% of the pelletizing undersize, 15-30% of Brazilian Carajas sinter feed, 10-25% of Brazilian coarse iron ore powder, 15-25% of West Australian powder, 15-25% of Australian FB powder, and 5-15% of Indian coarse ironore powder. In the invention, the byproduct, pelletizing undersize, which is generated during a direct iron reduction production process, is successfully applied to sinter the well-blended ore; by matching proper iron ore, adverse factors, such as low assimilation temperature of the pelletizing undersize, poor liquid-phase flowability and poor generation capability of calcium ferrite, are overcome, thus guaranteeing the application effect of the pelletizing undersize.

Description

technical field [0001] The invention belongs to the technical field of ironmaking raw material preparation and sintering production, and in particular relates to an iron ore mixed powder that uses pellet crushing to reduce costs and increase efficiency. Background technique [0002] Direct reduced iron production is a relatively mature short-process ironmaking process. At present, the world's production capacity is more than 70 million tons, mainly distributed in the Middle East and Eastern Europe. In the production process of direct reduced iron, the pellet under-sieve powder produced by the reducing pellet production line is called pellet crushing. This by-product has the advantages of high grade and less harmful impurities. Due to the lack of sintering machine production technology in the Middle East, Eastern Europe and other regions, these resources cannot be effectively used. Therefore, the by-products produced in the direct reduced iron process in these regions are mos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16
CPCC22B1/16
Inventor 门朝辉李士才张展雷张添伦
Owner 上海慧安科技股份有限公司
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