A method for protecting the furnace by injecting titanium from the tuyere by using the coal injection system of the blast furnace

Abstract

The invention provides a method for quickly protecting the furnace by spraying titanium from the tuyere by utilizing the coal injection system of the blast furnace. The prepared main components are TiO2 and fine iron powder, and the fine titanium powder with a particle size of ≤-200 mesh is hoisted to the coal blending bunker. The coal feeder at the bottom of the coal blending bunker adds the titanium fine powder to the coal feeding belt in batches, together with the raw coal powder, enters the coal grinding system through the raw coal bunker of the coal mill, and the titanium powder in the coal grinding system The fine powder and the raw coal powder are evenly mixed and then enter the pulverized coal bin; the blast furnace injection system injects the uniformly mixed titanium fine powder and raw coal powder into the blast furnace through the tuyeres. This method does not require additional equipment, and the existing pulverizing coal injection system of the blast furnace can be used to uniformly mix titanium fine powder and coal powder, and according to the titanium load requirements required for blast furnace protection, targeted, timely and safe The titanium concentrate powder is sprayed into the blast furnace along with the coal powder from the tuyere of the blast furnace through the coal injection gun to achieve the purpose of protecting the furnace.

Description

technical field [0001] The invention relates to a method for quickly repairing the hearth and furnace bottom of the blast furnace by using the existing injection system of the ironmaking blast furnace, especially a method for quickly protecting the furnace by spraying titanium from the tuyere by using the coal injection system of the blast furnace. Background technique [0002] Blast furnace hearth and furnace bottom erosion are major hidden dangers that threaten the safety of blast furnace production, and are also the main factors that determine the life of a generation of blast furnaces. Abnormal erosion of hearth is common in domestic and foreign blast furnaces, and effective control of abnormal erosion of blast furnace hearth has become an important technical goal of the world's ironmaking industry. [0003] At present, there are two main methods for conventional blast furnace spraying titanium to protect the furnace, one is to add titanium ore or titanium pellets from t...

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Problems solved by technology

[0005] This method partly solves the defects of adding titanium ore on the furnace top and tuyeres to feed the wire to protect the furnace, but there are also the following problems: on the one hand, the particle size of vanadium-titanium ore powder is relatively large, and the hardness of titanium dioxide is relatively large, so it is difficult to process coal when grinding coal. It is difficult to achieve the same particle size as pulverized coal in normal coal grinding, and it will cause damage to the coal mill; on the other hand, due to the density of vanadium-titanium ore powder (about 2.5t / m 3 ) and the density of pulverized coal (about 0.5t / m 3 ) is quite different, if the particle size of the vanadium-titanium ore powder is large, it is very easy to cause the coal pulverizer to spit out dust during the process of mixing with coal powder in the coal mill, and in the subsequent conveying process after the vanadium-titanium ore powder is mixed with coal powder It will also cause the composition segregation of the mixture and cannot guarantee the stability of the composition of the mixed powder.

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