Furnace-protecting material for blast furnaces and preparation and application methods thereof

A blast furnace protection and raw material technology, applied in the blast furnace, blast furnace details, blast furnace parts, etc., can solve the problems of high TiO2, the burden of the spray gun of the coal injection system, and the impact on the smooth slag discharge of the blast furnace, so as to reduce the titanium content and reduce the protection of the furnace Cost, the effect of reducing the blast furnace coke ratio

Active Publication Date: 2013-12-25
ANGANG STEEL CO LTD
View PDF5 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method overcomes the shortcomings of mixed powder segregation and coal gun easy to block to a certain extent, there are still many problems unsolved in this method: (1) Since the method does not give the proportion of titanium concentrate powder used, if the proportion used is too high High, although it can play a role in protecting the furnace, it will inevitably bring a burden to the coal injection system, especially the spray gun, and even cause the spray gun to be blocked
(2) After the titanium concentrate powder ore used has been screened, part of the sieved material is not used directly, but is used as a sintering raw material, which will inevitably lead to high furnace protection costs
(3) As part of the sieve is used as sintering raw material, it has returned to the old way of adding titanium ore or titanium balls from the furnace top, which will inevitably lead to low furnace protection efficiency
(4) In this method, due to the addition of titanium-containing sinter from the top of the furnace, it is bound to cause TiO in the slag 2 Higher, which in turn affects the smooth slag discharge of the blast furnace

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Set the mass percentage as: TiO 2 40%, TFe25%, Al 2 o 3 1.5%, SiO 2 4.5%, S <0.07%, FeO 38% titanium concentrate powder is dried and screened, and the titanium concentrate powder with a particle size of <0.075mm is sent to the silo of the blast furnace coal injection system, and the rest that do not meet the particle size requirements The titanium concentrate powder is sent to the grinder to prepare titanium concentrate powder with a particle size of <0.075mm, and then sent to the hopper of the blast furnace coal injection system.

[0031] 2. Mix 7.5% of CDQ powder and 54.5% of coal powder into a mixture, heat to remove water, and grind and separate. In order to improve the combustion rate of coal powder and CDQ powder and reduce the content of unburned powder, it is required to grind coal powder and CDQ powder Finally, the particle size <0.075mm should be between 70% and 80%. Among them: CDQ powder (mass percentage): moisture 1%, ash 2%, volatile matter 4%, S...

Embodiment 2

[0037] 1. The mass percentage is TiO 2 35%, TFe25%, Al 2 o 3 1.5%, SiO 24.5%, S <0.07%, FeO 38% titanium concentrate powder is dried and screened, and the titanium concentrate powder with a particle size of <0.075mm is sent to the silo of the blast furnace coal injection system, and the rest that do not meet the particle size requirements The titanium concentrate powder is sent to the grinder to prepare titanium concentrate powder with a particle size of <0.075mm, and then sent to the hopper of the blast furnace coal injection system.

[0038] 2. Mix 8% of CDQ powder and 57% of coal powder into a mixture, heat to remove water, and grind and separate. In order to improve the combustion rate of coal powder and CDQ powder and reduce the content of unburned powder, it is required to grind coal powder and CDQ powder Finally, the particle size <0.075mm should be between 70% and 80%. Among them: CDQ powder (mass percentage): moisture content is 1.5%, ash content is 2%, volatile...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a furnace-protecting material for blast furnaces and preparation and application methods thereof. The furnace-protecting material for the blast furnaces comprises the following components: 30-39% of ilmenite concentrate, 5-8% of CDQ (Coke Dry Quenching), and 51-65% of pulverized coal. The preparation method of the furnace-protecting material for the blast furnaces is implemented through uniformly mixing the CDQ powder with the pulverized coal in proportion so as to obtain a mixture, heating the mixture, dehydrating the mixture, and grinding and separating the mixture; uniformly mixing the ilmenite concentrate with the mixture so as to obtain the furnace-protecting material for the blast furnaces. When the temperatures of bottom and basque detecting couples rise or the temperature difference of cooling water rises, the furnace-protecting material for blast furnaces is injected; the furnace-protecting material is injected after roughing slags in the process of tapping, and after normal coal blending is performed for 2 hours, the furnace-protecting material is injected again; oxygen-enriched injection is performed in the process of injecting the furnace-protecting material. According to the invention, the influence of the titanium content of scrap iron in the slags on the flowability of the scrap iron in the slags can be reduced, so that while the disposal capacity of metallurgical wastes is reduced, the furnace-protecting cost and coke rate of blast furnaces are lowered, the efficiency and effect of furnace protecting are improved, and the service cycle of a furnace hearth is relatively extended.

Description

technical field [0001] The invention belongs to the technical field of blast furnace hearth maintenance, and in particular relates to a furnace protection material for blast furnaces and methods for preparing and using the same. Background technique [0002] Modern large-scale blast furnaces require that the first-generation furnace has not undergone intermediate repairs for more than 15 years. Although blast furnace refractory materials, cooling equipment, and cooling media have made great progress, the blast furnace hearth and local lining of the furnace bottom often erode in the actual production process. Or damaged, seriously affecting the life of the blast furnace generation, only a few blast furnaces have reached the design target. The longevity of the blast furnace depends not only on the design and construction quality of the blast furnace hearth, but also is closely related to the daily operation of the blast furnace, especially the maintenance of the hearth. [00...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00C21B7/06
Inventor 孙鹏车玉满郭天永刘杰姚硕陈国一
Owner ANGANG STEEL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap