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Magnesia spinel brick and preparation method thereof

A magnesia spinel and magnesia-rich spinel technology, applied in the field of magnesia spinel bricks and their preparation, can solve the problems of porosity requirements, compactness and compressive strength not meeting the use requirements and the like

Active Publication Date: 2014-11-26
HUNAN XIANGGANG RUITAI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the cost of the existing magnesia spinel brick, and because it is formed by one-shot punching, its apparent porosity is generally about 10%, and its compressive strength is generally below 100MPa, resulting in its porosity requirements and compactness. and compressive strength can not meet the requirements of RH smelting

Method used

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  • Magnesia spinel brick and preparation method thereof
  • Magnesia spinel brick and preparation method thereof
  • Magnesia spinel brick and preparation method thereof

Examples

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preparation example Construction

[0035] The present invention also provides a preparation method for the above magnesia spinel brick, comprising: mixing 60 to 80 parts by weight of magnesia, 10 to 20 parts by weight of dicalcium sand, 10 to 20 parts by weight of premix and 2 to 5 parts by weight The weight parts of the resin are mixed, blown into shape, and baked to obtain magnesia bricks; the premix includes: magnesium-rich spinel, activated alumina and metal silicon powder; the magnesia includes two or two Magnesia with different particle sizes above.

[0036] Wherein, the magnesia, dicalcium sand, premix and resin are the same as above, and will not be repeated here.

[0037] In order to fully mix the raw materials, the order of adding the raw materials in the present invention is preferably: mix 60-80 parts by weight of magnesia with 2-5 parts by weight of resin, preferably mix for 2-4 minutes, and then add 10-20 parts by weight of bismuth The calcium sand is mixed with 10-20 parts by weight of the premi...

Embodiment 1

[0045] 1.1 Add 18 parts by weight of large crystalline magnesia with a particle size of 5 to 3 mm, 27 parts by weight of large crystalline magnesia with a particle size of 3 to 1 mm, and 25 parts by weight of large crystalline magnesia with a particle size of 0 to 1 mm in 800 forcibly mixed After the sand machine, add 2.9 parts by weight of liquid phenolic resin, mix and grind for 2min, then add 15.9 parts by weight of dicalcium sand and 14 parts by weight of premix (comprising 7 parts by weight of magnesium-rich spinel micropowder in the premix , 6 parts by weight of activated alumina micropowder and 1 part by weight of metal silicon powder), mixed and milled for 15 minutes, then discharged, and hit 8 times with a pressure of 400 tons to form a blank with a thickness of about 100mm.

[0046] 1.2 Dry the green body obtained in 1.1 naturally for one day, then bake it at 200°C for 24 hours to obtain magnesia spinel bricks.

[0047] Performance tests were performed on the magnesi...

Embodiment 2

[0050] 2.1 Add 18 parts by weight of large crystalline magnesia with a particle size of 5 to 3 mm, 27 parts by weight of large crystalline magnesia with a particle size of 3 to 1 mm, and 25 parts by weight of large crystalline magnesia with a particle size of 0 to 1 mm in 800 forcibly mixed After the sand machine, add 2.9 parts by weight of liquid phenolic resin, mix and grind for 2min, then add 15.9 parts by weight of dicalcium sand and 14 parts by weight of premix (comprising 7 parts by weight of magnesium-rich spinel micropowder in the premix , 6 parts by weight of activated alumina micropowder and 1 part by weight of metal silicon powder), mixed and milled for 15 minutes, then discharged, and hit 8 times with 400 tons of pressure to form a blank with a thickness of about 100mm. After an interval of 20 minutes, use 400 tons of The pressure is hit 5 times to form a magnesia spinel brick body with a thickness of about 98.5mm.

[0051] 2.2 Dry the magnesia spinel brick body ob...

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Abstract

The invention provides a magnesia spinel brick, which is formed by 60-80 parts by weight of magnesia, 10-20 parts by weight of dicalcium sand, 10-20 parts by weight of a premix and 2-5 parts by weight of a resin. The premix comprises magnesium-enriched spinel, activated alumina and a silicon powder; and the magnesia includes two or more than two kinds of magnesia in different particle sizes. Compared with the existing magnesia spinel brick, the invention adopts magnesia of different particle sizes of as the matrix, which is added with a premix micropowder, so that granularity composition of the product is more reasonable and is in line with the close packing theory; and the premix contains metal silicon powder, which is oxidized to form silicon dioxide, forms into a liquid phase and produces volume expansion to filling the pores, thus the magnesia spinel brick has small pores, good compactness and high anti-scouring performance.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a magnesia spinel brick and a preparation method thereof. Background technique [0002] Refractories are used as structural materials for thermal equipment such as high-temperature kilns, as well as materials for industrial high-temperature containers and components, and can withstand corresponding physical and chemical changes and mechanical effects. With the development of high-temperature industry, higher requirements are put forward for the production and use of furnace lining refractory materials. Furnace lining refractories not only need to be in a high temperature environment for a long time, can withstand the erosion and erosion of high dust, strong corrosive furnace gas and slag, but also withstand sudden temperature changes, mechanical and material impact, wear and a combination of various stresses. influences. [0003] Now, in the iron and st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 曾昆章兴高曾立民肖亘
Owner HUNAN XIANGGANG RUITAI TECH