Magnesium-calcium material and preparation method thereof

A technology of magnesia-calcium and magnesia-calcium sand, which is applied in the field of magnesia-calcium materials, can solve the problems of poor hydration resistance of magnesia-calcium bricks, cumbersome treatment process, and environmental pollution, and achieve improved hydration resistance, simple process, and environmental friendliness low effect

Inactive Publication Date: 2020-06-02
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This magnesia-calcium brick has good refractory performance and long service life, but the hydration resistance of this magnesia-calcium brick is still poor due to the existence of free calcium oxide. After production, it needs to be dipped in wax and vacuumed aluminum foil Special treatment methods such as packaging and sealed packaging can prolong its storage and application time. The related treatment process is cumbersome, there is environmental pollution (wax dipping), and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A magnesium-calcium material and a preparation method thereof. First mix 65wt% magnesia-calcium sand particles, 28wt% magnesia-calcium sand fine powder, 3wt% cerium phosphate and 4wt% phosphotitanate, stir evenly, press into shape, and dry naturally for 23 hours; Dry for 10 hours at 1550°C, then fire for 3 hours at 1550°C, and cool to obtain a magnesium-calcium material.

[0027] The magnesium-calcium material prepared in this example is tested: the apparent porosity is 19.5%, and the compressive strength is 26.1MPa; it is maintained at 50°C and 90% humidity for 10 hours, and then dried at 110°C, the hydration of the magnesium-calcium material The weight gain rate is 0.59%; smelting at 1600°C for 30 minutes, the desulfurization efficiency of the metal melt is 50%.

Embodiment 2

[0029] A magnesium-calcium material and a preparation method thereof. First mix 69wt% magnesia-calcium sand particles, 26wt% magnesia-calcium sand fine powder, 2wt% cerium phosphate and 3wt% phosphotitanate, stir evenly, press into shape, and dry naturally for 20 hours; Drying at 1650°C for 8 hours, then firing at 1650°C for 4 hours, and cooling to obtain a magnesium-calcium material.

[0030] The magnesium-calcium material prepared in this example is tested: the apparent porosity is 17.5%, and the compressive strength is 27.6 MPa; it is maintained at 50°C and 90% humidity for 10 hours, and then dried at 110°C, the hydration of the magnesium-calcium material The weight gain rate is 0.51%; smelting at 1600°C for 30 minutes, the desulfurization efficiency of the metal melt is 52%.

Embodiment 3

[0032] A magnesium-calcium material and a preparation method thereof. First mix 70wt% magnesia-calcium sand particles, 20wt% magnesia-calcium sand fine powder, 5wt% cerium phosphate and 5wt% phosphotitanate, stir evenly, press into shape, and dry naturally for 30 hours; Dry at 1700°C for 16 hours, then burn at 1700°C for 2 hours, and cool to obtain a magnesium-calcium material.

[0033] The magnesium-calcium material prepared in this example is tested: the apparent porosity is 16.8%, and the compressive strength is 30.5MPa; it is maintained at 50°C and 90% humidity for 10 hours, and then dried at 110°C, the hydration of the magnesium-calcium material The weight gain rate is 0.45%; smelting at 1600°C for 30 minutes, the desulfurization efficiency of the metal melt is 53%.

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Abstract

The invention relates to a magnesium-calcium material and a preparation method thereof. The preparation method comprises the following steps: mixing 60-70 wt% of magnesia-calcia particles, 20-30 wt% of magnesia-calcia fine powder, 2-5 wt% of cerium phosphate and 3-6 wt% of phosphotitanate, uniformly stirring, carrying out compression molding, and naturally drying for 20-30 h; and drying for 8-16 hat the temperature of 110 DEG C, firing for 2-5 h at the temperature of 1500-1700 DEG C, and cooling to obtain the magnesium-calcium material, wherein the MgO content of the magnesia-calcia is greater than or equal to 40 wt%, the particle size of magnesia-calcia particles is 0.2-11 mm, and the particle size of the magnesia-calcia fine powder is 3-200 [mu]m; the particle size of the cerium phosphate is 3-200 [mu]m; and the content of P2O5 in the phosphotitanateis greater than or equal to 1wt%, and the content of TiO2 in the phosphotitanate is greater than or equal to 1 wt%. The method is simple in process, low in cost and environmentally friendly, and the prepared magnesium-calcium material is excellent in hydration resistance, remarkable in metal melt purification effect and suitable forpurifying refractory materials for smelting.

Description

technical field [0001] The invention belongs to the technical field of magnesium-calcium materials. In particular, it relates to a magnesium-calcium material and a preparation method thereof. Background technique [0002] With the needs of national defense construction and economic development, high-quality high-temperature alloys and high-quality steels for aerospace equipment, ships and ocean engineering, high-speed rail, oil and gas pipelines, etc. have put forward more stringent requirements for smelting, and smelting technology is becoming more and more purified. Refractory materials are not only containers for metal melts such as alloy liquid and molten steel in the smelting process, but also participate in the physical and chemical reactions of the metallurgical process. Ordinary refractory materials either decompose in high temperature and high vacuum environment, or react with alloying elements in the melt, thereby polluting the melt and affecting the quality stabi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/043C04B35/057C04B35/622
CPCC04B35/057C04B35/622C04B35/66C04B2235/3206C04B2235/3208C04B2235/447C04B2235/96C04B2235/9676
Inventor 魏耀武李炳蓉肖俊李
Owner WUHAN UNIV OF SCI & TECH
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