Method for preventing blast-furnace tuyere sleeve from sinking

A technology of tuyere cover and small tuyere cover, applied in the direction of tuyere, etc., can solve the problems such as the inability to fundamentally solve alkali metal hazards, the inability to eliminate hidden dangers in safety production, and the inability to fundamentally solve problems, so as to eliminate major safety hazards and increase The effect of molten iron production and low cost

Pending Publication Date: 2021-03-26
YANCHENG LIANXIN IRON & STEEL CO LTD
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AI Technical Summary

Problems solved by technology

[0006] 2. The discharge rate of alkali metal in the iron mouth slag is below 90%;
[0009] (1) By reducing the harmful elements of raw materials, the purchase price of ore will inevitably be increased, which will lead to an increase in cost;
[0010] (2) The dealkalization rate of the slag discharged from the iron mouth is low, which cannot fundamentally solve the harm caused by the alkali metal to the blast furnace;
[0011] (3) The problem cannot be solved fundamentally when the wind is used to clean metal Pb, Zn, etc. from the tuyere, resulting in hidden dangers of production safety that cannot be eliminated, and the risk of accidents still exists

Method used

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  • Method for preventing blast-furnace tuyere sleeve from sinking
  • Method for preventing blast-furnace tuyere sleeve from sinking

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Embodiment Construction

[0029] A method for preventing the tuyeres of a blast furnace from sinking, comprising the following processes:

[0030] ——Increase the alkali discharge rate of the iron mouth: control the quaternary alkalinity R of the slag 4 =(CaO+MgO) / (SiO 2 +Al 2 o 3 ) between 0.95 and 0.98 times; it can increase the dealkalization rate, so that the dealkalization (K2O+Na2O) rate of slag in the smelting process can reach 95.0 to 97.5%, which is 4.0 to 7.5% higher than the traditional slagging method, reaching an increase Large harmful elements are excluded from the iron mouth, reducing the enrichment of harmful elements in the furnace, reducing the erosion of refractory materials in the furnace and the peeling phenomenon caused by cracking of brick lining;

[0031] ——Increase the contact area of ​​the matching surface between the small tuyere sleeve and the tuyere middle sleeve: that is, increase the mating contact length between the tuyere small sleeve and the tuyere middle sleeve, so ...

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Abstract

The invention relates to the technical field of smelting, in particular to a method for preventing a tuyere sleeve of a blast furnace from sinking. The method comprises the following steps of increasing the alkali discharge rate of an iron notch: specifically controlling the quaternary alkalinity of slag to be 0.95-0.98 times; increasing the contact area between a tuyere small sleeve and a tuyeremiddle sleeve; and adding fixing supports at the tuyere position: specifically arranging two supporting frames on the outer side of a tuyere large sleeve, and fixedly connecting the two supporting frames with a furnace shell around the tuyere; fixedly connecting a connecting frame between the two supporting frames, and extending to the position below the tuyere small sleeve; and fixedly installingan arc-shaped bracket on the connecting frame, and supporting the arc-shaped bracket below the tuyere small sleeve. The method provided by the invention is low in cost and simple and effective in operation, and potential safety hazards caused by sinking of the tuyere small sleeve are avoided.

Description

technical field [0001] The invention relates to the technical field of smelting, in particular to a method for preventing the tuyere sleeve of a blast furnace from sinking. Background technique [0002] With the enhancement of blast furnace oxygen-enrichment measures and the increasing shortage of ore resources, especially the increasingly scarce high-quality ore resources, the contradiction between blast furnace intensified smelting and resource shortage is more obvious; however, the international competition of the steel industry, domestic The competition is becoming more and more fierce, and the key to competition is not only new products and product quality, but more importantly, the existence of cost advantage is the key factor in product market competition, which is more obvious in China. [0003] For this reason, in the practical operation of cost reduction, reducing the purchase price of ore is one of the most effective measures to reduce cost, and the quality of ore...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B7/16
CPCC21B7/16
Inventor 谢锦官谢吉祥刁承民陈小平廖运友孙欢黄卫聂志洪
Owner YANCHENG LIANXIN IRON & STEEL CO LTD
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