Blow-in burdening method for blast furnace

A technology of batching and blast furnace, which is applied to blast furnace, blast furnace details, furnace, etc., and can solve problems such as hanging material, high coke ratio, and material collapse

Active Publication Date: 2016-10-12
SHOUGANG CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems existing in the prior art, the embodiment of the present invention provides a batching method for blast furnace start-up, which is used to solve the problem in the prior art that when the blast furnace is started up, a large

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  • Blow-in burdening method for blast furnace
  • Blow-in burdening method for blast furnace
  • Blow-in burdening method for blast furnace

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Embodiment 2

[0066] Corresponding to Example 1, to repair 2650m 3 Taking the blast furnace as an example, the whole charge is firstly divided into three sections, see figure 2 , which are miscellaneous wood sections: from the hearth iron mouth center line to the tuyere center line, hard miscellaneous wood is loaded, the specification of hard miscellaneous wood is φ300×500mm; net coke section: above the hearth tuyere center line to the upper edge of the furnace waist 5 The rice is filled with clean coke. Normal material section: Load normal material from 5 meters along the upper edge of the furnace waist to 2 meters from the furnace throat material line, and its composition is: coke + pellets + fluorite.

[0067] Specifically, it is first determined that the ore batch 35t, the coke batch 14t, and the charge pile specific gravity loaded into the blast furnace are 1.2-1.6, preferably 1.3; the compression ratios of hard miscellaneous wood and coke are both 13%.

[0068] Secondly, calculate ...

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Abstract

The invention provides a blow-in burdening method for a blast furnace. The method comprises the steps that 100 m<3>-200 m<3> of coke and 300 m<3>-1,300 m<3> of hardwood are arranged in a miscellaneous tree section of the blast furnace; 10 t-20 t of dry extinction coke is arranged in each batch of materials of a net coke section of the blast furnace; 10 t-20 t of coke, 0.5 t-1 t of fluorite and pellet ores with the mass percent not smaller than 60% are arranged in each batch of materials of a normal material section of the blast furnace; and the content of CaF2 in material slag in the normal material section is 2%-6%, the content of Si in molten iron is 2.5%-4%, and the iron charge load level is not larger than 2.5. Thus, the blow-in cost can be reduced by adopting the hardwood for blow-in operation, by adoption of a large proportion of pellet for the blow-in operation, the furnace slag generation amount can be reduced, the ventilation performance of a soft melting belt is improved, the blow-in progress is accelerated, and the direct motion state of the blast furnace is stabilized; and the number of tapping times can be reduced through few-slag or ultralow-slag ratio blow-in, the tapping time is delayed, it is guaranteed that iron in the furnace obtains the sufficient physical heat, and more qualified pig iron can be better recycled.

Description

technical field [0001] The invention belongs to the technical field of blast furnace ironmaking, and in particular relates to a batching method for starting a blast furnace. Background technique [0002] The proportion and distribution method of blast furnace start-up charge is the core technology of blast furnace start-up, and also the key to determine the smooth start-up of blast furnace. [0003] Traditional blast furnace batching to control the basicity of slag and Al in slag 2 o 3 The content of sintered ore is used as an important reference index, and the gas permeability in the furnace is ensured by reasonable matching of sinter, pellet ore, lump ore, fluorite, silica, etc., and creates conditions for the blast furnace to quickly add wind to reach production. But often in order to slow down the Al in slag 2 o 3 Due to the negative impact on the fluidity of the slag, it is forced to increase the slag ratio and improve the fluidity in the furnace through a large amo...

Claims

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Application Information

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IPC IPC(8): C21B5/00
CPCC21B5/008
Inventor 张卫东范正赟徐萌
Owner SHOUGANG CORPORATION
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