Blast-furnace flue pipe and it preparation process

An air duct and blast furnace technology, which is applied in the field of preparing blast furnace air ducts by self-propagation method, can solve the problems of reducing the thermal conductivity of air ducts, reducing the temperature drop of hot air, erosion, etc., so as to reduce energy consumption of blast furnace, reduce temperature drop of hot air, and improve additional effect of value

Inactive Publication Date: 2007-07-18
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a blast furnace air duct and its preparation method, on the basis of solving the problems of hot wind erosion, erosion, poor thermal stability and low strength existing in the blast furnace air duct prepared by the traditional method, and further effectively reduce the The thermal conductivity of the air duct reduces the temperature drop of hot air

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The present invention is prepared from the following raw materials: blast furnace slag fine powder (the weight percentage of main components is CaO: 39.76%, SiO 2 : 35.08%, Al 2 o 3 : 14.04%, MgO: 8.02%, Fe 2 o 3 : 1.50%, TiO 2 : 1.60%), industrial CrO 3 , Industrial Cr 2 o 3 Powder, Al powder and Mg powder with a purity greater than 98%, aluminum dihydrogen phosphate solution with a specific gravity of 1.55.

[0020] The preparation method of the present invention is as follows:

[0021] A. Prepare the mold core according to the shape and size of the air supply pipe (gooseneck, elbow, straight blowing pipe).

[0022] B, the industrial CrO 3 、Cr 2 o 3 Sieve to obtain powders less than 0.210mm, and then blast furnace slag, Al and Mg with an average particle size of less than 0.105mm according to blast furnace slag: Al powder: Mg powder: CrO 3 +Cr 2 o 3 =30:7.3:9.2:53.5 weight ratio batching, sieve and mix evenly.

[0023] C. Add 10% aluminum dihydrogen pho...

Embodiment 2

[0027] The present invention is prepared from the following raw materials: blast furnace slag fine powder (the weight percentage of main components is CaO: 37.06%, SiO 2 : 38.76%, Al 2 o 3 : 14.09%, MgO: 7.05%, Fe 2 o 3 : 1.46%, TiO 2 : 1.58%), industrial CrO 3 , Al powder with a purity greater than 98%, and aluminum dihydrogen phosphate solution with a specific gravity of 1.58.

[0028] The preparation method of the present invention is as follows:

[0029] A. Prepare the mold core according to the shape and size of the air supply pipe (gooseneck, elbow, straight blowing pipe).

[0030] B, the industrial CrO 3 Sieve to get the powder less than 0.210mm, and then the blast furnace slag and Al whose average particle size is less than 0.105mm are divided into blast furnace slag: Al powder: CrO 3 =50:8:42 weight ratio batching, sieve and mix evenly.

[0031] C. Add 5% aluminum dihydrogen phosphate solution with a specific gravity of 1.58 to the mixture obtained in step B ...

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Abstract

The present invention provides one kind of blast furnace air pipe and its making process. The blast furnace air pipe consists of metal shell and liner, and the material for the liner includes blast furnace slag 30-50 wt%, chromium oxide 30-60 wt%, binding material 5-10 wt%, and metal Al or Mg for the rest. The making process making mold core for the air pipe, forming cavity between the mold core and the shell, tamping the liner mixture into the cavity, taking out the mold core, stoving, and self-spreading sintering. The present invention has high strength, high resistance against hot blast erosion, lower heat conductivity of liner, reduced temperature decrease of hot blast, capacity of reducing power consumption of blast furnace and other advantages.

Description

technical field [0001] The invention relates to a blast furnace air pipe in iron and steel enterprises and a preparation method thereof, in particular to a blast furnace air pipe prepared by a self-propagating method using blast furnace slag as raw material. Background technique [0002] At present, the hot blast pipeline of blast furnace is long and the heat dissipation area is large. Because the refractory material lining in the branch pipe falls off, the tube shell becomes red, and the heat dissipation is more serious. According to statistics, the heat dissipation loss of the tube shell accounts for more than 2% of the total heat energy loss. The temperature of the hot air drops by 40°C to 80°C at this stage, and the coke ratio decreases by 20kg for every 100°C increase in the hot air temperature. The heat insulation effect of the pipeline is of great significance to increase the temperature of the blast furnace and reduce the energy consumption of the blast furnace. [Jo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B7/16C04B18/14C04B35/01C04B35/64B28B1/30
CPCY02W30/91
Inventor 于淑娟杨大正徐大勇孙永芳黄晓煜阎强朱建伟
Owner ANGANG STEEL CO LTD
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