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Method for preventing excessive fusion of prereduced sinter

A technology of sintering ore and sintering material, which is applied in the field of preventing excessive melting of pre-reduced sintering ore. It can solve the problems of rising temperature of material layer, increasing carbon content, excessive melting of raw materials, etc., so as to improve the metallization rate and improve the utilization of fuel. efficiency, improving high temperature performance and strength

Active Publication Date: 2014-01-15
ANGANG STEEL CO LTD
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Problems solved by technology

[0009] The invention provides a method for preventing excessive melting of pre-reduced sintered ore, which solves the problems of excessive melting of raw materials due to the increase of carbon content and the increase of material layer temperature in the current production of pre-reduced sintered ore

Method used

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  • Method for preventing excessive fusion of prereduced sinter
  • Method for preventing excessive fusion of prereduced sinter

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Embodiment 1

[0023] The pre-reduction sintering test was carried out with the mixed ore, and the composition of the mixed ore is shown in Table 1.

[0024] Table 1 Mixed iron ore composition / %

[0025]

[0026] The sintered material layer is composed of three kinds of carbon-containing pellets with different particle sizes; the carbon-containing pellets are made of iron material, carbon-containing raw material and binder; the binary basicity of the sintered material layer is 1.9.

[0027] The sintered material is divided into upper, middle and lower layers. The carbon-containing raw material in the carbon-containing pellet composition of the upper layer is coke powder, the binder is sodium humate, and the mass percentage of sodium humate is 0.9%; the mass percentage of coke powder is 22% , and the rest are iron materials. The particle size of the carbon-containing pellets in the upper layer is 3mm~6mm, and this layer accounts for 45% of the total mass of the sintered material layer.

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Abstract

The invention discloses a method for preventing excessive fusion of prereduced sinter, the method is characterized in that: during sintering material arrangement, three carbon containing pellets are respectively arranged in three layers of an upper layer, a middle layer and a lower layer, wherein the three carbon containing pellets are different in granularity, and the upper pellet granularity is small and the lower pellet granularity is large. The upper layer accounts for 45%-55% of the total mass of the sinter bed, the middle layer accounts for 25%-35% of the total mass of the sinter bed, and the lower layer accounts for 15-25% of the total mass of the sinter bed. The granularity range of the carbon containing pellets is 3mm-12mm, the carbon containing pellets are prepared by mixing an iron material, a carbon containing raw material and a binder, and after material arrangement, prereduced sintering is performed to obtain the finished prereduced sinter. The advantages and effects of the method are in that: through layered arrangement of the sintered pellets with different carbon contents and granularity, the sinter bed permeability is increased, the fuel use rate and prereduction sintering utilization coefficient are improved, and the quality of the prereduced sinter is improved. The middle layer and the lower layer of the sintering material use large pellet sintering, petroleum coke is added in the pellets, the petroleum coke has good reactivity at low temperature and has a reduced reactivity at the temperature of more than 1300 DEG C, so that excessive fusion of the material layer in a sintering process can be prevented, and the metallization ratio of the prereduced sinter is improved.

Description

technical field [0001] The invention belongs to the technical field of ironmaking raw material production, and relates to the production technology of pre-reduced sintered ore, in particular to a method for preventing excessive melting of pre-reduced sintered ore. Background technique [0002] The energy consumption of the ironmaking process accounts for about 70% of the total energy consumption of steel production. In order to improve the energy structure of the ironmaking process, it is necessary to re-understand the raw materials used in the blast furnace, and sinter is one of the most important raw materials for the blast furnace. The pre-reduction sinter is to add a reducing agent to the sintering raw material, and reduce it while forming agglomerates to produce a sinter containing metallic iron and ferrous oxide. Ordinary sinter starts to shrink slowly after 1150°C, so the furnace pressure difference is also high. When it exceeds 1400°C, it will shrink sharply, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16C22B1/244
Inventor 张辉周明顺翟立委刘杰
Owner ANGANG STEEL CO LTD
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