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Method for enhancing strength of high-aluminum preform

A prefabricated, high-aluminum technology, which is applied in the field of prefabricated parts processing, can solve the problems of difficulty in transportation and use of prefabricated parts, reduce the slag resistance performance of prefabricated parts, reduce the service life of refractory materials, etc., so as to improve the slag corrosion resistance. , The effect of reducing operating costs and improving service life

Inactive Publication Date: 2018-11-23
SHANGHAI LIER REFRACTORY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, calcium aluminate cement and ρ-Al are mainly used in high alumina prefabricated parts 2 o 3 Micropowder is a binder, but these two binders have their own defects. For example, increasing the amount of calcium aluminate cement added will reduce the slag resistance of the prefabricated part and accelerate its corrosion rate, thereby reducing the service life of the refractory ; while ρ-Al 2 o 3 Due to quality problems in recent years, the micro powder always has low low-temperature and medium-temperature strength, which makes it difficult for the strength of the preform to meet the requirements for transportation and use.

Method used

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  • Method for enhancing strength of high-aluminum preform

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Comparison scheme
Effect test

Embodiment 1

[0034] The method for enhancing the strength of high-aluminum prefabricated parts is carried out according to the following steps:

[0035] 1) First raise the water temperature to 60-70°C, then add the magnesium sulfate heptahydrate solute calculated according to the solubility into the water, stir until there is no solvent at the bottom of the solution, then let the water temperature cool down to room temperature naturally, and set aside;

[0036] 2) Ladle prefabricated bricks (aluminum content 85wt%) are neatly stacked on special pallets and naturally cured for 3-4 days;

[0037] 3) Then soak it in a supersaturated solution of magnesium sulfate heptahydrate until the air bubbles on the surface of the prefabricated brick disappear. The whole process takes 3 hours;

[0038] 4) Put the prefabricated bricks soaked in the solution into a low-temperature baking kiln at 150°C and bake for 25 hours. After leaving the kiln, they can become finished products.

Embodiment 2

[0040] The method for enhancing the strength of high-aluminum prefabricated parts is carried out according to the following steps:

[0041] 1) First raise the water temperature to 60-70°C, then add the magnesium sulfate heptahydrate solute calculated according to the solubility into the water, and add lanthanum oxide at the same time, the amount of lanthanum oxide is 10wt% of the magnesium sulfate heptahydrate, and stir until the solution There is no solvent at the bottom, the stirring rate is 200rpm, and then let the water cool down to room temperature naturally to form a soaking liquid for later use;

[0042] 2) Ladle prefabricated bricks (92wt% aluminum content) are neatly stacked on special pallets, and naturally cured for 3-4 days;

[0043] 3) Then soak it in the soaking solution until the air bubbles on the surface of the prefabricated brick disappear, and the whole process takes 4 hours;

[0044] 4) Put the whole prefabricated brick soaked in the solution into a low-te...

Embodiment 3

[0046] The method for enhancing the strength of high-aluminum prefabricated parts is carried out according to the following steps:

[0047] 1) First raise the water temperature to 60-70°C, then add the magnesium sulfate heptahydrate solute calculated according to the solubility into the water, and add cerium oxide at the same time, the amount of cerium oxide is 20wt% of the magnesium sulfate heptahydrate, and stir until the solution There is no solvent at the bottom, the stirring rate is 300rpm, and then let the water cool down to room temperature naturally to form a soaking liquid for later use;

[0048] 2) Ladle prefabricated bricks (with an aluminum content of 90wt%) are neatly stacked on special pallets, and naturally cured for 3-4 days;

[0049] 3) Then soak it in the soaking solution until the air bubbles on the surface of the prefabricated brick disappear, and the whole process takes 4 hours;

[0050] 4) Put the prefabricated bricks soaked in the solution into a low-temp...

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Abstract

The invention provides a method for enhancing the strength of a high-aluminum preform, comprising the following steps: (A) adding magnesium sulfate heptahydrate into water, thoroughly stirring to formsoaking liquid, and cooling for standby application; (B) demoulding the aluminum preform, then naturally curing, soaking in the soaking liquid until bubbles on the surface of the aluminum preform disappear, and baking at a temperature of 200 DEG C or lower for 30 hours or shorter. The method provided by the embodiment of the invention can greatly increase the normal temperature strength of the preform subjected to natural curing by adding salt and rare earth oxide in the high aluminum soaking process, and also can reduce the addition amounts of binding agents such as calcium aluminate cementand rho-Al2O3 micropowder in the high aluminum material, thus promoting the slag corrosion resistance of the material, finally greatly improving the intermediate temperature strength of the soaked preform, and being capable of effectively alleviating structural flaking caused by thermal stress concentration of the preform during use.

Description

technical field [0001] The invention relates to the field of prefabricated parts processing, in particular to a method for enhancing the strength of high aluminum prefabricated parts. Background technique [0002] At present, high-aluminum prefabricated parts are widely used in ladle molten pool and tundish impact zone. These prefabricated parts are prefabricated at the manufacturer and then shipped to the site for assembly. In order to meet the requirements for the strength of prefabricated parts during transportation and assembly, traditional prefabricated parts mainly enhance their own strength by increasing the amount of binder added. [0003] However, calcium aluminate cement and ρ-Al are mainly used in high alumina prefabricated parts 2 o 3 Micropowder is a binder, but these two binders have their own defects. For example, increasing the amount of calcium aluminate cement added will reduce the slag resistance of the prefabricated part and accelerate its corrosion rat...

Claims

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Application Information

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IPC IPC(8): C04B41/85
CPCC04B41/009C04B41/5014C04B41/85C04B41/4539C04B35/66
Inventor 郭勇李洪波汪正峰
Owner SHANGHAI LIER REFRACTORY MATERIAL
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