Ventilation material for molten iron ladle and preparation method thereof

A technology of breathable materials and ladles, applied in applications, household utensils, ceramic products, etc., can solve the problems of insufficient high-temperature strength and breathability stability of breathable materials, unstable breathability, poor corrosion resistance, etc., to achieve high temperature resistance Bending strength, stable air permeability, and the effect of ensuring mechanical strength

Active Publication Date: 2019-03-01
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual use process, there are mainly problems such as unstable air permeability, poor corrosion resistance and low high temperature strength of breathable materials.
[0004] In the existing technical solutions, the introduction of additives to promote the sintering of the breathable material and adjust the structure has played a certain role in improving the mechanical strength and corrosion resistance of the breathable material, but the high temperature strength and breathability stability of the breathable material There are still some deficiencies

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A breathable material for ladle and a preparation method thereof. The preparation method described in this embodiment is:

[0056] In the first step, 40-45wt% corundum fine powder, 1-10wt% α-Al 2 o 3 Micro powder, 45-50wt% quartz sand fine powder, 1-10wt% aluminum hydroxide, 1-10wt% aluminum fluoride, 1-5wt% additive, 1-5wt% foaming agent, 1-5wt% The foam stabilizer, 0.1-1wt% water reducer and 1-5wt% calcium aluminate cement are mixed to obtain a mixture; then 10-15wt% of water is added to the mixture, stirred evenly, poured and solidified for 15 After ~20 hours, a solidified green body is obtained.

[0057] The second step is to dry the cured body at 90-110°C for 12-16 hours, and then heat-treat at 1500-1600°C for 5-7 hours to obtain pre-fired material; then crush the pre-fired material and screen To obtain the granular material A with a particle size of less than 0.25 mm and the granular material B with a particle size of 0.25 to 1 mm.

[0058] The 3rd step, with...

Embodiment 2

[0070] A breathable material for ladle and a preparation method thereof. The preparation method described in this embodiment is:

[0071] In the first step, 45-50wt% corundum fine powder, 1-10wt% α-Al 2 o 3 Fine powder, 40-45wt% quartz sand fine powder, 1-10wt% aluminum hydroxide, 1-10wt% aluminum fluoride, 1-5wt% additive, 1-5wt% foaming agent, 1-5wt% Foam stabilizer, 0.1-1wt% water reducing agent and 1-5wt% calcium aluminate cement are mixed to obtain a mixture; then 14-20wt% of water is added to the mixture, stirred evenly, poured and solidified for 10 After ~16 hours, a solidified green body was obtained.

[0072] The second step is to dry the cured green body at 100-120°C for 15-20 hours, and then heat-treat at 1400-1500°C for 5-7 hours to obtain pre-fired material; then crush the pre-fired material and screen To obtain the granular material A with a particle size of less than 0.25 mm and the granular material B with a particle size of 0.25 to 1 mm.

[0073] The thir...

Embodiment 3

[0085] A breathable material for ladle and a preparation method thereof. The preparation method described in this embodiment is:

[0086] In the first step, 50-55wt% corundum fine powder, 1-10wt% α-Al 2 o 3 Fine powder, 35-40wt% quartz sand fine powder, 1-10wt% aluminum hydroxide, 1-10wt% aluminum fluoride, 1-5wt% additive, 1-5wt% foaming agent, 1-5wt% Foam stabilizer, 0.1-1wt% water reducing agent and 1-5wt% calcium aluminate cement are mixed to obtain a mixture; then 15-18wt% of water is added to the mixture, stirred evenly, poured and solidified for 12 After ~17 hours, a solidified green body was obtained.

[0087] The second step is to dry the cured body at 90-110°C for 18-24 hours, and then heat-treat it at 1450-1550°C for 5-7 hours to obtain calcined material; then crush the calcined material and screen To obtain the granular material A with a particle size of less than 0.25 mm and the granular material B with a particle size of 0.25 to 1 mm.

[0088] In the third s...

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Abstract

The invention relates to a ventilation material for a molten iron ladle and a preparation method thereof. The method is characterized in that corundum fine powder, alpha-Al2O3 micro powder, quartz sand fine powder, aluminum hydroxide, aluminum fluoride, additives, foaming agents, foam stabilizing agents, water reducing agents and calcium aluminate cement are mixed; water is added; stirring, shaping, curing and drying are performed; heat treatment is performed at 1,400 to 1,600 DEG C; crushing and sieving are performed to obtain a particle material A and a particle material B with different granularities; then, thermosetting phenolic resin, surfactants, monatomic silicon powder, silicon carbide powder, copper powder and ammonium metavanadate are mixed and are uniformly stirred to obtain modified resin; next, corundum particles, particle material A, particle material B, crystalline flake graphite, silicon carbide powder and modified resin are uniformly mixed and are pressed and shaped; heat treatment is performed at 100 to 300 DEG C to obtain the ventilation material for the molten iron ladle. The ventilation material has the advantages that the production cost is low; the prepared ventilation material for the molten iron ladle has the characteristics of great high-temperature anti-folding intensity, stable ventilation performance, excellent flushing-resistant performance and a long service life.

Description

technical field [0001] The invention belongs to the technical field of breathable materials. Specifically relates to a breathable material for ladle and a preparation method thereof. Background technique [0002] Hot metal pretreatment desulfurization process is an important metallurgical process for smelting low-sulfur or ultra-low-sulfur steel. Aiming at the problems of low slag removal efficiency, large iron loss and residual slag in molten iron after desulfurization of molten iron, ventilating bricks are installed on the side or bottom of the ladle. Remarkable results have been achieved in improving slag discharge and slag accumulation and improving molten iron pretreatment process. [0003] The current materials of breathable materials include clay, corundum, and spinel. According to actual working conditions, the types mainly include diffuse type, through-hole type, and slit type. In the actual use process, the main problems of air permeable materials are unstable a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/103C04B35/622C04B35/626C04B38/08C04B38/00B22D41/02C21C7/064
CPCC21C7/064C04B35/1015C04B35/103C04B35/622C04B35/62605C04B38/0041C04B38/08B22D41/02C04B2235/3222C04B2235/3218C04B2235/3208C04B2235/3232C04B2235/3239C04B2235/3826C04B2235/3284C04B2235/3418C04B2235/445C04B2235/428C04B2235/407C04B2235/425C04B2235/96C04B2235/77C04B38/0067C04B38/0074
Inventor 王周福熊鑫刘浩王玺堂马妍
Owner WUHAN UNIV OF SCI & TECH
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