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A method for controlling zinc load in blast furnace

A load, blast furnace technology, applied in the field of smelting, can solve the problems of destroying the blast furnace lining, reducing the thermal strength of coke, and bonding the furnace wall, and achieving the effect of ensuring effective utilization, reducing production costs, and ensuring stable production.

Active Publication Date: 2022-07-05
HEBEI XINDA IRON & STEEL GRP CO LTD
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  • Application Information

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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  • A method for controlling zinc load in blast furnace
  • A method for controlling zinc load in blast furnace
  • A method for controlling zinc load in blast furnace

Examples

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Effect test

Embodiment

[0069] Example: A steel mill uses this method to control the zinc load of blast furnace fuel, as detailed below.

[0070] (1) Determine the zinc load index into the furnace and control it at Zn (∝) =300g / t.

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

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

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

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

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Abstract

The invention discloses a method for controlling the zinc load of a blast furnace. The method steps are: (1) determining the limit zinc load Zn of the blast furnace according to the level of raw fuel. (∝) ; (2) Determine the charge structure of the blast furnace, and calculate the zinc load Zn in the natural lump ore. (w) ; (3) Calculate the blast furnace zinc load Zn brought by the fuel from the theoretical comprehensive fuel ratio (R) ; (4) Calculate the total allowable zinc load Zn of sinter and pellets from the blast furnace charge structure (Z) ; (5) Determine the maximum zinc load Zn in the sinter (S) or the maximum zinc load Zn in pellets (Q) ; Determine the zinc load range of another material according to the structure of the charge; (6) Determine the zinc content of sinter and pellets with different ratios and grades according to requirements; (7) In the case of ensuring that the zinc load into the furnace is within a reasonable range production as required. The method effectively ensures the long-term stable running of the blast furnace and the reduction of iron-making costs; it not only ensures that the zinc load into 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 zinc load of the blast furnace is the mass of zinc carried by ton of iron in the raw fuel into the furnace. The harmful element zinc involved in the blast furnace ironmaking process will have a negative impact on the normal operation and equipment life of the blast furnace ironmaking process. The specific manifestations are: the zinc entering the furnace will increase the reactivity of the coke and reduce the thermal strength of the coke. , which directly affects the thermal properties of coke; at the same time, zinc also affects the softening performance of the charge, promotes the adhesion of the furnace wall, and affects the forward run of the blast furnace; in addition, zinc will damage the blast furnace lining 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 Patents(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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