Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Repair material for molten iron desulfurization stirring paddle

A technology for hot metal desulfurization and repair material, which is applied in the field of refractory materials for hot metal pretreatment before converter steelmaking, can solve the problems of unfavorable factors in the service life of the stirring paddle, increase the maintenance cost of the stirring paddle, affect the service life of the stirring paddle, etc., and achieve perfect construction Performance and usability, improved erosion resistance and spalling resistance, good sintering condition

Active Publication Date: 2014-07-02
莱芜钢铁集团泰东实业有限公司
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Through the on-site investigation of the above-mentioned KR molten iron stirring desulfurization and the inspection of the damage condition of the stirring paddle repair material, it is found that the main forms of repair material damage are erosion, cracking, thermal spalling, etc. Good sintering cannot be carried out under temperature conditions, resulting in loose lining structure and low bonding strength, which will bring disadvantages to the maintenance of the service life of the stirring blade
Statistical data show that the KR stirring paddle repair material of Laiwu Iron and Steel Steelmaking Plant falls off after being used for 3 to 4 times, which seriously affects the service life of the stirring paddle
On the other hand, the use of coke gem raw materials also greatly increases the later maintenance cost of the stirring paddle and increases the material cost of the supplier

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

[0033] A repair material for molten iron desulfurization stirring paddle, which is made by mixing repair material base material and additives. Andalusite, 28% refractory clay, 2% pure calcium aluminate cement. The additive is based on the total weight of the repair material base material (100%), and consists of 0.3% sodium tripolyphosphate and 0.2% aluminum silicate fiber cotton.

[0034] Its physical and chemical indicators: compressive strength (110℃×24h) 29Mpa, compressive strength (1500℃×3h) 66Mpa; bulk density (110℃×24h) 2.95g / cm 3 , Bulk density (1500℃×3h) 2.82g / cm 3 , The line change after burning (1500℃×3h) is ±0.2%.

[0035]The particle size of high alumina bauxite is 1-3 mm, the particle size of coke gemstone is 0.1-1 mm, and the particle size of andalusite is 200 mesh fine powder.

[0036] A preparation method for a repairing material for a molten iron desulfurization stirring paddle comprises the following steps:

[0037] 1. The high-alumina bauxite, burnt gems...

Embodiment 2

[0041] Other is with embodiment 1, and difference is:

[0042] The additive is based on the total weight of the repair material base material (100%), and consists of 0.3% melamine and 0.2% aluminum silicate fiber cotton.

[0043] The particle size of high alumina bauxite is 200 mesh fine powder, the particle size of coke gemstone is 0.1-1 mm, and the particle size of andalusite is 0.1-1 mm.

Embodiment 3

[0045] Other is with embodiment 1, and difference is:

[0046] The additive is based on the total weight of the repair material base material (100%), and is composed of 0.3% sodium tripolyphosphate and 0.2% organic fiber.

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

PropertyMeasurementUnit
compressive strengthaaaaaaaaaa
compressive strengthaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a repair material for a molten iron desulfurization stirring paddle, which is prepared by mixing a base material and a proper amount of additives. The base material is prepared from the following components in percentage by weight: 45-65% of common bauxite, 3-8% of flint clay, 10-20% of andalusite, 20-28% of fireclay and 1-5% of pure calcium aluminate cement. The additives are sodium tripolyphosphate or melamine, and aluminum silicate fiber crushed cotton or organic fiber; on the basis of the total weight of the base material of the repair material (100%), the sodium tripolyphosphate or melamine accounts for at most 0.5%, and the aluminum silicate fiber crushed cotton or organic fiber accounts for at most 0.5%; and the two additives are matched, and the addition amount can not be zero. In order to overcome the defects in the prior art, the invention provides a repair material for a molten iron desulfurization stirring paddle, which has the advantages of wide raw material sources, low cost and excellent properties. The repair material can repair the stirring paddle, and can prolong the average service life of the KR desulfurization stirring paddle by more than 30 times.

Description

technical field [0001] The invention belongs to the field of refractory materials for molten iron pretreatment before converter steelmaking, and in particular relates to a repairing material for molten iron desulfurization stirring paddles. Background technique [0002] At present, when domestic and foreign metallurgical enterprises carry out stirring desulfurization of molten iron before converter steelmaking, most of the large and medium-sized steelmaking enterprises use KR stirring paddles for desulfurization, and most of the repair materials used for online maintenance are refractory materials mainly made of coke gemstones . [0003] Take the repair material for KR stirring paddle used in steel mills as an example. Its main raw material is coke gemstones, and its main ingredients are calculated by weight percentage AI 2 o 3 ≥55%, SiO 2 ≥20%, its physical and chemical indicators: compressive strength (110℃×24h) ≥20Mpa, compressive strength (1500℃×3h) ≥58Mpa; bulk densi...

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 Patents(China)
IPC IPC(8): C04B35/66
Inventor 刘杰郭鹏鹿洪利巩秀民刘少斌管山吉
Owner 莱芜钢铁集团泰东实业有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products