Method for feeding titanium fine powder serviced as furnace protecting agent of blast furnace into furnace through injection system

A technology for blast furnace protection and titanium refining, which is applied to blast furnaces, blast furnace details, furnaces, etc., can solve problems such as segregation of mixed powder components, blockage of discharge ports, etc., to save energy, reduce costs, and ensure the effect of furnace protection

Active Publication Date: 2012-12-26
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The object of the present invention is to provide a method of injecting blast furnace protective agent titanium fine powder into the furnace through the injection system, which overcomes the

Method used

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  • Method for feeding titanium fine powder serviced as furnace protecting agent of blast furnace into furnace through injection system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] TiO 2 52.00%, TFe 31.66%, SiO 2 4.4%, Al 2 o 3 1.67%, ≥ 70% titanium-containing fine powder with a particle size of less than 74 μm, dried in a drum dryer at 200°C for 20 minutes, and obtained a titanium-containing fine powder with a temperature of 95°C and a moisture content of 0.54%, with a pore size of 149 μm After sieving by a vibrating sieve, the part with a particle size greater than 149 μm is the oversize, and the part with a particle size less than 149 μm is the undersize. Enter the titanium fine powder bin; the titanium fine powder in the titanium fine powder bin and the coal powder in the coal powder bin respectively enter the mixer through the feeding valve, and the titanium fine powder and the coal powder are mixed in the mixer for 20 minutes to obtain the titanium fine powder and Coal powder mixture, and use compressed air to supplement the uniform mixture in the mixer through the pressure supplement valve; the uniform mixture of titanium fine powder ...

Embodiment 2

[0026] TiO 2 48.00%, TFe 34.00%, SiO 2 5.2%, Al 2 o 3 2.57%, ≥ 70% of the titanium-containing fine powder with a particle size of less than 74 μm, dried in a drum dryer at 400°C for 5 minutes, and obtained a titanium-containing fine powder with a temperature of 80°C and a moisture content of 0.96%, with a pore size of 149 μm After sieving by a vibrating sieve, the part with a particle size greater than 149 μm is the oversize, and the part with a particle size less than 149 μm is the undersize. Enter the titanium fine powder bin; the titanium fine powder in the titanium fine powder bin and the coal powder in the coal powder bin respectively enter the mixer through the feeding valve, and the titanium fine powder and the coal powder are mixed in the mixer for 5 minutes to obtain the titanium fine powder and Coal powder mixture, and use compressed air to supplement the uniform mixture in the mixer through the pressure supplement valve; the uniform mixture of titanium fine po...

Embodiment 3

[0028] TiO2 50.25%, TFe 30.00%, SiO 2 5.8%, Al 2 o 3 2.26%, ≥ 70% of the titanium-containing fine powder with a particle size of less than 74 μm, dried in a drum dryer at 300°C for 15 minutes, and obtained a titanium-containing fine powder with a temperature of 87°C and a moisture content of 0.74%, with a pore size of 149 μm After sieving by a vibrating sieve, the part with a particle size greater than 149 μm is the oversize, and the part with a particle size less than 149 μm is the undersize. Enter the titanium fine powder bin; the titanium fine powder in the titanium fine powder bin and the coal powder in the coal powder bin respectively enter the mixer through the feeding valve, and the titanium fine powder and coal powder are mixed in the mixer for 10 minutes to obtain the titanium fine powder and Coal powder mixture, and use compressed air to supplement the uniform mixture in the mixer through the pressure supplement valve; the uniform mixture of titanium fine powder...

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Abstract

The invention relates to a method for feeding titanium fine powder serviced as a furnace protecting agent of a blast furnace into a furnace through an injection system. Titanium-containing fine powder is used as a raw material. The method comprises the following steps of: drying and screening the titanium-containing fine powder; delivering overtails to a sintering material yard for sintering; mixing throughs with coal dust, and delivering the mixture to a coal dust injection system through a delivery pipe and a distributor; injecting the mixture into the blast furnace through a spray gun; mixing the coal dust or the uniform mixture in gas in the delivering process, and discharging the coal dust or the uniform mixture through a pressure relief valve and a discharging valve; dedusting the discharged gas; diffusing the processed gas; and returning the removed dust to a coal dust bunker for recycling so as to save raw materials and prevent waste. According to the method, the technical problem of component segregation of the mixed powder caused by different densities and blockage at discharge ports are solved. The method is reasonable in design, advanced in process and low in cost and has a good furnace protecting effect.

Description

technical field [0001] The invention relates to the maintenance of iron-making blast furnaces, in particular to a method for feeding the blast furnace protection agent titanium fine powder into the furnace through an injection system. Background technique [0002] With the evolution of large-scale and modern iron-making blast furnaces, the importance of long life and high efficiency of blast furnaces has become increasingly apparent, especially in the face of fierce international and domestic competition in the steel market in the 21st century. The road to "strong metallurgical enterprise". The cost of pig iron accounts for as much as 50% of the production cost of the entire iron and steel complex, and one of the important measures to increase the output and quality of pig iron and reduce the cost of pig iron is to build a long-lived and efficient blast furnace, which can not only save overhaul costs, improve smelting indicators, increase The output of pig iron can be incre...

Claims

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Application Information

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IPC IPC(8): C21B5/00
Inventor 罗霞光李建云郭东曾晖王学斌梁栋周勇张英周小辉白志刚周林张炯张毅
Owner LAIWU IRON & STEEL GRP
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