Method for protecting converter through slag splashing by using carbon dioxide and nitrogen

A technology of carbon dioxide and slag splashing to protect the furnace, which is applied to the improvement of process efficiency and the manufacture of converters, etc., can solve the problems of inability to efficiently splash slag and improve the operation rate of the converter, so as to facilitate maintenance and long-life operation, and improve corrosion resistance , good economic and social benefits

Active Publication Date: 2021-11-26
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the problems existing in the prior art, and provide a method for protecting the furnace by splashing slag with carbon dioxide and nitrogen, which solves the problem that the existing method for protecting the furnace cannot realize high-efficiency slag splashing and improve the efficiency of the converter in the current fast-paced production mode. job rate problem

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

[0019] A method for protecting the furnace by splashing slag with carbon dioxide and nitrogen, smelting steel type CSPSPHC, with an end point carbon content of 0.038%, and an end point temperature of 1693°C. After tapping, pour out 1 / 2 of the slag in the converter, including the following steps:

[0020] a. Shake the furnace to the normal smelting position, add 1.8-2.0kg / t of slag splashing material containing 15-25% carbon and 14-24% magnesium according to the tapping temperature, and fix the gun position at 200mm higher than the blowing gun position , the slag splashing gas is all carbon dioxide, the gas pressure is 1.2MPa, the carbon dioxide blowing gun position is 1m, and the slag splashing can be seen after blowing to the furnace mouth for 45-50s;

[0021] b. Fix the gun position between 200-1000mm higher than the blowing gun position for circular injection, switch the slag splashing gas to a mixed gas of carbon dioxide and nitrogen, and the content of carbon dioxide and n...

Embodiment 2

[0024] A method for protecting the furnace by splashing slag with carbon dioxide and nitrogen, smelting steel type 355B, with an end point carbon content of 0.078%, and an end point temperature of 1710°C. After tapping, pour out 1 / 2 of the slag in the converter, including the following steps:

[0025] a. Shake the furnace to the normal smelting position, add 1.6-1.8kg / t of slag splashing material containing 15-25% carbon and 14-24% magnesium according to the tapping temperature, and fix the gun position at 200mm higher than the blowing gun position , the slag splashing gas is all carbon dioxide, the gas pressure is 1.2MPa, the carbon dioxide blowing gun position is 1m, and the slag splashing can be seen after blowing to the furnace mouth for 35-40s;

[0026] b. Fix the gun position between 200-1000mm higher than the blowing gun position for circular injection, switch the slag splashing gas to a mixed gas of carbon dioxide and nitrogen, and the content of carbon dioxide and nitr...

Embodiment 3

[0029] A method of using carbon dioxide and nitrogen to splash slag to protect the furnace. The smelting steel is 70#, the end point carbon content is 0.65%, and the end point temperature is 1650°C. After the steel tapping is completed, 2 / 3 of the slag in the converter is poured out, including the following steps:

[0030] a. Shake the furnace to the normal smelting position, add 0.8-1.0kg / t of slag splashing material containing 15-25% carbon and 14-24% magnesium according to the tapping temperature, and fix the gun position at 200mm higher than the blowing gun position , the slag splashing gas is all carbon dioxide, the gas pressure is 1.2MPa, the carbon dioxide blowing gun position is 1m, and the slag splashing can be seen after blowing to the furnace mouth for 25-30s;

[0031] b. Fix the gun position between 200-1000mm higher than the blowing gun position for circular injection, switch the slag splashing gas to a mixed gas of carbon dioxide and nitrogen, and the content of c...

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 method for protecting a converter through slag splashing by using carbon dioxide and nitrogen. The method is suitable for the converter using the slag splashing for protecting the converter to maintain the condition of the converter, specially-made slag splashing materials are added after tapping of the converter, the adding amount is adjusted according to parameters such as the final temperature and molten steel components, the carbon dioxide is completely adopted as slag splashing gas in the early stage of slag splashing, the characteristics of carbon dioxide kinetic energy and carbon reaction heat absorption are utilized to realize rapid thickening of low-viscosity slag in the early stage and continuous change of carbon dioxide and nitrogen in the middle stage, so that the kinetic energy of gas is continuously changed, the splashing angle of slag blocks is enriched, the area in a hearth for slag splashing protection and slag scraping is enlarged, weak parts of single-gas slag splashing are reduced, the heat absorption mechanism of the reaction of carbon dioxide and carbon is utilized in the later period, rapid cooling and solidification of the slag splashing layer are achieved, carbon on the surface of the slag splashing layer is removed, the erosion resistance of the slag splashing layer is improved, maintenance of the converter condition and long-life operation are better facilitated, and good economic benefits and social benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of metal smelting, and relates to a method for protecting a furnace by splashing slag with carbon dioxide and nitrogen. Background technique [0002] Slag plays an important role in the converter smelting process, and can be used as a melting medium, slag-splashing furnace raw material, etc. The viscosity of liquid slag has a direct impact on the smelting process and slag-splashing effect. In the production of converter steelmaking, there are many problems in the stability of converter smelting, which makes the maintenance of converter furnace difficult. [0003] Viscosity is one of the characteristics of slag. Slag with different viscosity directly affects the effect of slag splashing. Among them, if the viscosity of slag is too high, the dynamic conditions required for slag splashing will increase, and the impact area of ​​slag will become smaller, making it difficult for the upper slag to splash. , the l...

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
IPC IPC(8): C21C5/44C21C5/36
CPCC21C5/443C21C5/36Y02P10/20
Inventor 魏国立朱青德胡绍岩冯超朱荣
Owner GANSU JIU STEEL GRP HONGXING IRON & 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