High-strength castable for prolonging service life of desulfuration spray gun and preparation method thereof

A desulfurization spray gun, high-strength technology, applied in the field of refractory materials, can solve problems such as short service life, and achieve the effect of increasing the bonding capacity

Inactive Publication Date: 2015-11-11
JIANGSU VOCATION & TECHNICAL COLLEGE OF FINANCE & ECONOMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The invention aims at the short service life of the existing desulfurization spray gun, and provides a refractory castable with good mechanical strength performance

Method used

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  • High-strength castable for prolonging service life of desulfuration spray gun and preparation method thereof
  • High-strength castable for prolonging service life of desulfuration spray gun and preparation method thereof
  • High-strength castable for prolonging service life of desulfuration spray gun and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The distribution ratio of each group is (mass percentage):

[0038] Andalusite: 12%, mullite: 21%, coke gem: 30%, spinel: 12%, SiC: 7%, pure calcium aluminate cement: 18%, sodium citrate is 0.09% of the total weight of the above raw materials %.

[0039] The particle diameters of the andalusite are 3-1mm and 1-0.088mm respectively, and the ratio of the two is 1:1.

[0040] The particle diameters of the spinel and SiC are respectively fine powders less than 0.088mm.

[0041] The mullite, the particle size of each component of the coke gem is respectively 8-5mm, 5-3mm, 3-1mm, 1-0.088mm and fine powder less than 0.088mm, the particle size distribution of each component, 1:1:1:1:1 respectively.

[0042] The preparation method comprises the following steps: according to the mass percentage of the raw materials,

[0043] (1) Mix andalusite, mullite, coke gemstone, spinel, SiC, pure calcium aluminate cement and sodium citrate evenly, add an appropriate amount of water, and...

Embodiment 2

[0049] The distribution ratio of each group is (mass percentage):

[0050] Andalusite: 18%, mullite: 17%, coke gem: 33%, spinel: 11%, SiC: 6%, pure calcium aluminate cement: 15%, sodium citrate is 0.09% of the total weight of the above raw materials %.

[0051] The particle diameters of the andalusite are 3-1mm and 1-0.088mm respectively, and the ratio of the two is 2:1.

[0052] The particle diameters of the spinel and SiC are respectively fine powders less than 0.088mm.

[0053] The mullite, the particle size of each component of the coke gem is respectively 8-5mm, 5-3mm, 3-1mm, 1-0.088mm and fine powder less than 0.088mm, the particle size distribution of each component, They are 2:1:1:1:1 respectively.

[0054]Step (2) The billet is baked in a furnace, and kept at 800°C for three hours to obtain a castable.

[0055] All the other implementations are as in Example 1.

Embodiment 3

[0057] The distribution ratio of each group is (mass percentage):

[0058] Andalusite: 20%, mullite: 18%, coke gem: 23%, spinel: 15%, SiC: 6%, pure calcium aluminate cement: 18%, sodium citrate is 0.09% of the total weight of the above raw materials %.

[0059] The particle diameters of the andalusite are 3-1mm and 1-0.088mm respectively, and the ratio of the two is 3:1.

[0060] The particle diameters of the spinel and SiC are respectively fine powders less than 0.088mm.

[0061] The mullite, the particle size of each component of the coke gem is respectively 8-5mm, 5-3mm, 3-1mm, 1-0.088mm and fine powder less than 0.088mm, the particle size distribution of each component, They are 2:2:1:1:1 respectively.

[0062] Step (2) The billet is baked in a furnace, and kept at 1400°C for three hours to obtain a castable.

[0063] All the other implementations are as in Example 1.

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Abstract

The invention discloses a high-strength castable for prolonging the service life of a desulfuration spray gun and a preparation method thereof. The castable is composed of following raw materials, by mass, 8-20% of andalusite, 15-25% of mullite, 20-35% of flint clay, 10-25% of spinel, 4-8% of SiC, 10-20% of a binding agent, and a water reducing agent accounting for 0.04-0.12% of the total weight the raw materials hereinabove. In the invention, the flint clay and the mullite are used as the main raw materials of the castable, the andalusite is used as an expansion agent and the spinel and fine powder of SiC are used as a composite additive in the castable. In addition, a multi-stage blending process is employed with the low-cement combination technology being applied, wherein the characters of ultra-micro powder are fully considered, so that the castable is excellent in normal temperature performances and is high in medium and high temperature strength.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to high-strength refractory castables for desulfurization spray guns in steelmaking plants. Background technique [0002] In the desulfurization process operation, the spray gun is inserted into the depth of the molten iron while injecting gas and powder, and is pulled out after working for a period of time (generally 10-15 minutes). Therefore, the spray gun is intermittently operated at first. At the same time, the injected gas stirs the molten iron, and the agitation of the molten iron causes the spray gun refractory material to undergo high-temperature erosion and wear, and the vibration of the gun body during spraying brings mechanical damage. In addition, intermittent operation The resulting sudden change in temperature makes the working conditions of the spray gun castable very harsh, and is prone to perforation, cracking, melting loss, peeling, etc., and then destroys the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 何玉林姚年春
Owner JIANGSU VOCATION & TECHNICAL COLLEGE OF FINANCE & ECONOMICS
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