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A kind of synthetic magnesium calcium sand and preparation method thereof

A technique for magnesia-calcium sand and preparation steps, which is applied in the field of magnesia-calcium sand, can solve the problems of reducing free CaO content and reducing the high-temperature performance of MgO-CaO materials, and achieves the improvement of hydration resistance, saving labor resources, and equipment requirements low effect

Inactive Publication Date: 2011-12-21
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of chemical method generates a new low-melting point phase, reduces the content of free CaO, and especially reduces the high-temperature performance of MgO-CaO materials, so there are also certain defects.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A synthetic magnesia-calcium sand and a preparation method thereof. First add 25-27wt% calcium hydroxide and 73-75wt% magnesium hydroxide into the ball mill, and ball-mill to within 30 μm; place the ball-milled mixture in a muffle furnace for calcination at a calcination temperature of 700-750°C, The holding time is 0.25 to 0.5 hours; then add 20 to 22 wt% water of the mixture to the calcined mixture, and digest for 1 to 2 hours to obtain a digestion mixture; add 1 to 1.5 wt% of the digestion mixture to the digestion mixture wt% of additives, mixed and stirred for 10-15 minutes to obtain a stirred mixture; then the stirred mixture was pressed into shape by a semi-dry method, dried naturally for 12-15 hours after molding, and then baked at 100-120°C after natural drying Bake for 12-15 hours, and finally burn in a high-temperature furnace at 1600-1650°C, keep warm for 4.5-5 hours, and then synthesize magnesia-calcium sand after crushing.

[0022] The additive in this exa...

Embodiment 2

[0024] A synthetic magnesia-calcium sand and a preparation method thereof. This embodiment 2 is the same as embodiment 1 except that the additive is cerium oxide. In the magnesia-calcium sand synthesized in Example 2, the total content of CaO and MgO is ≥97.2wt%, and the content of CaO is ≥20.2wt%. Its particle volume density is 3.33~3.34g / cm2 after measurement. 3 ; The apparent porosity is 2.1-2.2%; the research on the anti-hydration performance shows that the hydration weight gain rate is 1.5-1.6%.

Embodiment 3

[0026] A synthetic magnesia-calcium sand and a preparation method thereof. This embodiment 3 is the same as embodiment 1 except that the additive is yttrium oxide. The magnesia-calcium sand synthesized in Example 3 has a total content of CaO and MgO ≥ 97.2wt%, a content of CaO ≥ 20.3wt%, and a particle volume density of 3.34 to 3.35g / cm2. 3 ; The apparent porosity is 2.2-2.3%; the research on the anti-hydration performance shows that the hydration weight gain rate is 1.6-1.7%.

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Abstract

The invention relates to synthetic calcium magnesite and a preparation method thereof. The preparation method comprises the steps of firstly carrying out ball milling on 25-30wt% of calcium hydroxide and 70-75wt% of magnesium hydroxide to reach the grain size within 30 mu m, heating the ball-milled mixture in a muffle furnace to 700-900 DEG C, and insulating heat for 0.25-0.5 hour; adding water the amount of which is 20-25wt% of the mixture to the calcined mixture, and digesting for 1-2 hours; and then adding an additive the amount of which is 1-3wt% of the digested mixture to the digested mixture, stirring, carrying out mechanical press shaping by a semi-dry method, naturally drying for 12-15 hours, baking at the temperature of 100-120 DEG C for 12-15 hours, finally firing in a high-temperature furnace at the temperature of 1600-1750 DEG C, insulating heat for 3-5 hours and crushing to obtain the synthetic calcium magnesite. The preparation method provided by the invention has the advantages of simple process and no need for special synthesis equipment and treatment technology. The synthesized calcium magnesite has the characteristics of high purity, wide application range, good sintering performance, good hydration resistance, and no influence on high-temperature use performance.

Description

technical field [0001] The invention belongs to the technical field of magnesia-calcium sand. Specifically relates to a synthetic magnesia-calcium sand and a preparation method thereof. Background technique [0002] With the rapid development of my country's national economy, the requirements for steel quality in various fields are also getting higher and higher. The steel quality is not only related to the steelmaking process, but also closely related to various furnace lining materials. Metallurgical equipment such as converters, electric furnaces, ladles, and tundishes are not only containers for holding molten steel, but the refractory materials used in the lining will also participate in metallurgical reactions during the metallurgical process. [0003] MgO-CaO materials have been used in iron and steel metallurgy since the British metallurgist Thomas proposed the basic converter steelmaking method in 1879. In the process of high temperature use, MgO-CaO material has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 赵惠忠张寒刘锋齐延俊余俊聂建华
Owner WUHAN UNIV OF SCI & TECH
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