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Method for controlling zinc load of blast furnace

A load and blast furnace technology, applied in the field of smelting, can solve problems such as furnace wall bonding, damage to blast furnace lining, and reduce thermal strength of coke, so as to achieve the effects of ensuring stable production, ensuring effective utilization, and reducing production costs

Active Publication Date: 2021-09-21
HEBEI XINDA IRON & STEEL GRP CO LTD
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

The harmful element zinc involved in the blast furnace ironmaking process will have a negative impact on the normal operation of the blast furnace ironmaking process and the life of the equipment. The specific manifestations are: zinc entering the furnace will increase the reactivity of coke and reduce the thermal strength of coke , directly affects the thermal performance of coke; at the same time, zinc will also affect the softening performance of the charge, promote the bonding of the furnace wall, and affect the smooth running of the blast furnace; moreover, zinc will also damage the lining of the blast furnace and affect the life of the blast furnace
Excessive zinc content in the furnace fuel will cause abnormal stability of the blast furnace thermal system, abnormal blast furnace gas flow stability, increased blast furnace consumption, easy blockage of gas sampling holes, easy jamming of the gas shut-off valve stem, and frequent blast furnace nodules phenomena such as increased

Method used

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  • Method for controlling zinc load of blast furnace
  • Method for controlling zinc load of blast furnace
  • Method for controlling zinc load of blast furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0069] Embodiment: A steel mill adopts this method to control the zinc load of blast furnace fuel, specifically as follows.

[0070] (1) Determine the zinc load index of the furnace to be controlled at Zn (∝) = 300 g / t.

[0071] (2) The furnace charge structure is 10wt% of South African ore, 65wt%≤A≤68wt% of sintered ore, and 25wt%≥B≥22wt% of pellet ore.

[0072] The furnace zinc load in South African mines is calculated by the formula (I): Zn (w) =ω1 (Zn) *106 / (ω1 (Fe) *0.99 / 0.945), where ω1 (Zn) =0.002%, ω1 (Fe) =64.1%, into the above formula to get Zn (w) = 29.78 g / t.

[0073] (3) The comprehensive fuel ratio of the steel plant k=500kg / t, calculated by the formula (II): Zn (R) =k*1000*A*ω2 (Zn) , where A=12.5%, ω2 (Zn) =0.071%, brought into the above formula to get Zn (R) = 39.94 g / t.

[0074] (4) The total amount of zinc load Zn allowed to be brought into the blast furnace by sinter and pellets (Z) Calculated by formula (Ⅲ): Zn (Z) =300-Zn (w) *10%-Zn (R) ,...

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Abstract

The invention discloses a method for controlling the zinc load of a blast furnace. The method comprises the following steps that (1), the limit load Zn <(varies as)> of zinc entering the blast furnace is determined according to the level of crude fuel; (2), the furnace burden structure of the blast furnace is determined, and the zinc load Zn <(w)> in the natural lump ore in the furnace burden structure is calculated; (3), the blast furnace zinc load Zn <(R)> brought by the fuel is calculated according to the theoretical comprehensive fuel ratio; (4), the total zinc load Zn <(Z)> allowed to be brought into a sinter and a pellet is calculated according to the blast furnace burden structure; (5), the maximum value Zn <(S)> of the zinc load in the sinter or the maximum value Zn <(Q)> of the zinc load in the pellet is determined, and the zinc load range of another material is determined according to the furnace burden structure; (6), the zinc content of the sinter and the zinc content of the pellet under different proportions and grades are determined according to requirements; and (7), under the condition of ensuring that the furnace zinc load is in a reasonable range, production is carried out according to requirements. According to the method, long-period stable and smooth operation of the blast furnace and reduction of the ironmaking cost are effectively guaranteed, and the method not only ensures that the load of zinc entering the furnace does not exceed the standard, but also ensures the effective utilization of zinc-containing solid waste.

Description

technical field [0001] The invention relates to the technical field of smelting, in particular to a method for controlling the zinc load of a blast furnace. Background technique [0002] The blast furnace zinc load is the quality of zinc brought into the furnace by ton of iron in the raw fuel. The harmful element zinc involved in the blast furnace ironmaking process will have a negative impact on the normal operation of the blast furnace ironmaking process and the life of the equipment. The specific manifestations are: zinc entering the furnace will increase the reactivity of coke and reduce the thermal strength of coke , directly affects the thermal properties of coke; at the same time, zinc will also affect the softening performance of the charge, promote the bonding of the furnace wall, and affect the smooth running of the blast furnace; moreover, zinc will also damage the lining of the blast furnace and affect the life of the blast furnace. Excessive zinc content in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00G06F30/20
CPCC21B5/00C21B5/008C21B5/001G06F30/20G06F2119/02Y02P10/20
Inventor 吴虹利纪彩明李亚双
Owner HEBEI XINDA IRON & STEEL GRP CO LTD
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