Titanium-containing powder for blast furnace protection and furnace protection method for injection through blast furnace coal injection system

Abstract

The invention belongs to the technical field of blast furnace iron making, and particularly relates to titanium-containing powder for blast furnace protection and a blast furnace protection method for injecting the titanium-containing powder through a blast furnace coal injection system. The content of TiO2 in the titanium-containing powder ranges from 30 wt% to 90 wt%, and by weight percent, the titanium powder with the granularity being smaller than 200 meshes accounts for 40%-100%. The titanium-containing powder and pulverized coal are injected into a blast furnace together through the blast furnace coal injection system. The furnace protection method comprises the following steps that firstly, the titanium-containing powder and the pulverized coal are evenly mixed; and secondly, the titanium-coal mixture obtained after mixing is placed in an injection tank of the blast furnace coal injection system, conveyed to a blast furnace tuyere through an injection pipeline and finally injected into the blast furnace through the tuyere. When the titanium-containing powder is injected, normal coal injection is not stopped, the titanium-containing powder is injected evenly, and uniformity and stability of a blast furnace hearth are guaranteed; the pulverizing and injection processes do not need to be changed, the phenomenon of segregation of the pulverized coal and the titanium powder is not generated, the combustibility of titanium coal is not changed in comparison with the pulverized coal, and a mill and the injection system are not influenced.

Description

technical field [0001] The invention belongs to the technical field of blast furnace ironmaking, and in particular relates to a titanium-containing powder for blast furnace protection and a blast furnace protection method for spraying titanium-containing powder by using a blast furnace coal injection system. Background technique [0002] Blast furnace hearth erosion is a major hidden danger that threatens the safety of blast furnace production, and it is also the main factor that determines the life of a generation of blast furnaces. Effectively controlling the abnormal erosion of the blast furnace hearth has become an important technical goal of the world's ironmaking industry. One of the measures to control the abnormal erosion of the hearth is to add titanium to the blast furnace to protect the furnace, that is, to add TiO to the blast furnace 2 materials, using TiO 2 High melting point substances such as TiN, TiC and Ti(CN) are generated in the blast furnace, and bonde...

AI Technical Summary

Problems solved by technology

These methods can achieve the effect of directly protecting the eroded part of the hearth, but there are disadvantages such as the need to stop the normal coal injection at the tuyeres, and the uniformity and stability of the blast furnace hearth due to the local addition of a large amount of titanium powder.

Therefore, such methods are limited to emergency and short-term treatment of severe corrosion in the blast furnace hearth, and the application range is very small

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