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Magnesium aluminate spinel prepared by electrically melting hydrated magnesia-alumina bricks and preparation method of magnesium aluminate spinel

A technology of magnesia-alumina spinel and magnesia-alumina brick, which is applied in the field of refractory materials and can solve the problems of high cost and complicated operation process.

Pending Publication Date: 2022-04-12
TONGDA REFRACTORY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: in order to overcome the technical problems of complicated operation process and high cost in the existing synthesis process of magnesia aluminum spinel, the present invention provides a magnesia aluminum spinel prepared by electrofusion of hydrated magnesia aluminum brick Stone and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The present invention utilizes the magnesia-aluminum spinel prepared by electric melting of hydrated magnesia-alumina bricks to prepare Al 2 o 3 The mass percent content is 60% magnesia-aluminum spinel as a benchmark, and the magnesia-alumina spinel is made of raw materials≤5mm hydrated magnesia-aluminum brick particles 50wt% (the mass percent of alumina in hydrated magnesia-aluminum brick particles 20%, moisture content ≤ 3%) and alumina powder 50wt%.

Embodiment 2

[0023] The preparation method of magnesium aluminum spinel described in embodiment 1 of the present invention, its detailed steps are as follows:

[0024] a, take various raw materials according to the raw material ratio of magnesium aluminum spinel described in embodiment 1;

[0025] b. Mix the weighed hydrated magnesia-aluminum brick particles and alumina powder, and mix uniformly to obtain a mixed material;

[0026] c. Add the mixed material obtained in step b into a three-phase electric arc furnace for smelting at a melting temperature of 2100° C., smelting to a molten state, and then slowly cooling to form solid magnesium aluminum spinel.

[0027] The relevant performance testing data of the solid magnesium aluminum spinel prepared in this example are shown in Table 1.

[0028] Table 1 The relevant performance detection data of the solid magnesium aluminum spinel prepared in Example 2

[0029] Al 2 o 3 %

Embodiment 3

[0031] The present invention utilizes the magnesia-aluminum spinel prepared by electric melting of hydrated magnesia-alumina bricks to prepare Al 2 o 3 The magnesia-alumina spinel with a mass percentage content of 70% is used as a benchmark, and the magnesia-alumina spinel is composed of 50 wt% of hydrated magnesia-aluminum brick particles with a raw material ≤ 5mm (the mass percentage of alumina in hydrated magnesia-aluminum brick particles 20%, moisture content ≤ 3%) and alumina powder 60wt%.

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Abstract

The invention discloses magnesium aluminate spinel prepared by electrically melting hydrated magnesia-alumina bricks and a preparation method of the magnesium aluminate spinel. On the basis of preparing magnesium aluminate spinel with the mass percentage content of Al2O3 being 60-70%, the magnesium aluminate spinel is prepared from 35-50 wt% of hydrated magnesia-alumina brick particles with the particle size being smaller than or equal to 5 mm and 50-65 wt% of alumina powder. The preparation method comprises the following steps: weighing various raw materials according to the raw material proportion of the magnesium aluminate spinel, and uniformly mixing the various raw materials to obtain a mixed material; and adding the obtained mixed material into a three-phase electric arc furnace, smelting to a molten state, and finally slowly cooling to obtain the solid magnesium aluminate spinel. According to the technical scheme, the magnesium aluminate spinel raw material with the high additional value is synthesized by taking the low-cost hydrated magnesium-aluminum brick as the raw material, the technological process is simple, and the cost is low.

Description

1. Technical field: [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a magnesia-alumina spinel prepared by electric fusion of hydrated magnesia-alumina bricks and a preparation method thereof. 2. Background technology: [0002] Magnesium-aluminum spinel has the characteristics of high temperature resistance, small thermal expansion coefficient, good thermal stability and strong slag resistance. It is a high-quality refractory raw material and is widely used in iron and steel smelting, cement rotary kiln and glass industrial kiln and other fields. However, natural magnesia-aluminum spinel resources are limited, and the industrial needs are usually met by artificial synthesis. The synthesis methods mainly include solid-phase sintering, melting, co-precipitation, drying and washing, and high-temperature atomization. Among them, the fusion method mostly uses light-burned magnesium powder and industrial alumina to be co-gro...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/443
Inventor 康剑张积礼马淑龙马飞朱凌云高长贺周新功倪高金张海波
Owner TONGDA REFRACTORY TECH CO LTD
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