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Magnesia refractory materials property promotion method and the product produced thereby

A refractory material and magnesia technology, which is applied in the field of improving and improving the technical performance of magnesia refractory materials, and can solve the problems of increasing chromium oxide content, pore diameter, etc.

Inactive Publication Date: 2007-08-29
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a solution is proposed, there is no report on how to increase the content of chromium oxide and reduce the pore size in any relevant literature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1 A method for improving the performance of magnesia-chrome bricks

[0014] A method for improving the performance of magnesia-chrome bricks, the specific steps are as follows:

[0015] 1. Preparation of chromium oxide precursor sol: mix chromium chloride and urea at a molar ratio of 2 to 5:5 to 10, prepare a solution with a concentration of 1.0 to 5.0 mol / L with water, and add 0.05 to 0.2 mol / L per liter of solution mol of ethyl acetate, then reacted at 80-95°C for 10-20 hours, and cooled naturally.

[0016] 2. Preparation of magnesia-chromium spinel precursor sol: mix chromium sulfate, magnesium sulfate, and urea in a molar ratio of 2 to 5:2 to 5:5 to 10, and use ethanol to prepare a concentration of 1.0 to 5.0 mol / L Add 0.05 to 0.5 mol of polyethylene glycol per liter of the solution, react the solution at 80 to 90°C for 12 to 24 hours, and cool naturally.

[0017] 3. The method to improve the performance of magnesia-chrome bricks: place the magnesia-chr...

Embodiment 2

[0021] Embodiment 2 A method for improving the performance of magnesium-chromium castables

[0022] A method for improving the performance of magnesium-chromium castables, the specific steps are as follows:

[0023] 1. Chromium oxide precursor sol: mix chromium chloride and urea at a molar ratio of 3-6:5-10, prepare a solution with a concentration of 1.0-5.0 mol / L with ethyl acetate, and add 0.02- 0.1 mol of polyacrylamide, then react at 80-95°C for 10-20 hours, and cool naturally.

[0024] 2. Magnesium-chromium spinel precursor sol: mix chromium sulfate, magnesium sulfate, and urea in a molar ratio of 3-6:3-6:5-10, and prepare a concentration of 1.0-5.0 mol with a mixed solvent of ethanol and water / L of solution, add 0.10-0.8mol of polyethylene glycol per liter of solution, react the solution at 80-90°C for 12-24 hours, and cool naturally.

[0025] 3. The method to improve the performance of magnesia-chrome castables: place the prefabricated parts of magnesia-chrome castab...

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Abstract

The invention relates to a method for improving technical characteristics of magnesia refractory materials which comprises, placing the magnesia refractory materials into a vacuum plant, vacuum-pumping to -0.05~-0.1MPa, pressure maintaining 1-15 minutes, pumping in chromium-containing precursor nano collosol under vacuum state, pressurizing to 0.1-0.5 MPa, pressure maintaining 1-15 minutes, releasing pressure, taking out magnesia refractory materials, baking and drying 10-72 hours at 100-200 deg. C.

Description

1. Technical field [0001] The invention belongs to the technical field of magnesia refractories. In particular, it relates to a method for improving and enhancing the technical performance of magnesia refractories. 2. Background technology [0002] Magnesia refractories, such as magnesia-chrome refractories, are mainly used in copper smelting furnaces, VOD / AOD furnaces, EAF furnaces, RH dip tubes and rotary kilns (M.K.Haldar, H.S.Tripathi, S.K.Das, A.Ghosh.Effect of compositional variation on the synthesis of magnesite-chrome composite refractory. Ceramics International, 2004, 30: 911-915.), in order to improve the performance of magnesite-chrome refractories, a method of impregnation is proposed. In the selection of impregnation solution materials, magnesium sulfate and magnesium chloride are generally popular at home and abroad. At present, only magnesia-chrome refractory materials for RH dipped pipe lining are impregnated with high-concentration magnesium salt solution ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B41/60C04B41/65
Inventor 汪厚植邓勇跃赵惠忠顾华志
Owner WUHAN UNIV OF SCI & TECH
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