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High-calcium magnesia-calcium-carbon brick and manufacturing method thereof

A technology of high-calcium-magnesium-calcium-carbon bricks and calcium-magnesium-calcium-carbon bricks, which is applied in the field of refractory materials for steel ladles in the metallurgical industry, can solve problems such as inability to adapt to corrosion resistance, and improve spalling resistance, thermal shock resistance, and stability Good, the effect of improving the service life

Active Publication Date: 2009-05-27
DASHIQIAO JINLONG REFRACTORY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, most of the non-slag line parts used in domestic ladle walls are aluminum-magnesium-carbon unfired bricks. This kind of brick was developed earlier and has a wide variety. The pollution of molten steel and other aspects cannot meet the above requirements

Method used

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  • High-calcium magnesia-calcium-carbon brick and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A high-calcium-magnesium-calcium-carbon brick made of the following raw materials in weight percentage:

[0030] 1-5mm magnesia calcium sand (CaO 58%, MgO 38%) 50.5%,

[0031] Magnesia-calcium sand (CaO 58%, MgO 38%) ≤1mm 10.4%,

[0032] ≤1mm magnesia (MgO 97%) 9.4%,

[0033] ≤0.088mm magnesia powder (MgO 97%) 20.2%,

[0034] Graphite 3.5%,

[0035] ≤0.088mm aluminum powder 1.0%,

[0036] Silicon powder ≤0.088mm 1.0%,

[0037] ≤0.088mm silicon carbide powder 1.0%,

[0038] Phenolic resin (moisture content 0.5%) 3.0%.

[0039] The manufacture method of above-mentioned high-calcium-magnesium-calcium-carbon brick is as follows:

[0040] 1) The magnesia and magnesia-calcium sand are mechanically crushed by a crusher, and sieved by a 5mm and 1mm sieve to make magnesia-calcium sand with a particle size of 1-5mm and a particle size of ≤1mm and magnesia with a particle size of ≤1mm. Part of the magnesia with particle size ≤ 1mm is processed into magnesia powder with par...

Embodiment 2

[0049] A high-calcium-magnesium-calcium-carbon brick made of the following raw materials in weight percentage:

[0050] 1-5mm magnesia calcium sand (CaO 56%, MgO 36%) 40%,

[0051] ≤1mm magnesia-calcium sand (CaO 56%, MgO 36%) 5%,

[0052] Magnesia (MgO 97.5%) ≤1mm 5%,

[0053] ≤0.088mm magnesia powder (MgO 97.5%) 30%,

[0054] Graphite 8%,

[0055] ≤0.088mm aluminum powder 3%,

[0056] Silicon powder ≤0.088mm 3%,

[0057] ≤0.088mm silicon carbide powder 3%,

[0058] Phenolic resin (moisture content 0.3%) 3%.

[0059] The manufacturing method of high calcium magnesium calcium carbon brick is as follows:

[0060] 1) The magnesia and magnesia-calcium sand are mechanically crushed by a crusher, and sieved by a 5mm and 1mm sieve to make magnesia-calcium sand with a particle size of 1-5mm and a particle size of ≤1mm and magnesia with a particle size of ≤1mm. Part of the magnesia with particle size ≤ 1mm is processed into magnesia powder with particle size ≤ 0.088mm by ball mi...

Embodiment 3

[0069] A high-calcium-magnesium-calcium-carbon brick made of the following raw materials in weight percentage:

[0070] 1-5mm magnesia calcium sand (CaO 56.5%, MgO 36.4%) 60%,

[0071] ≤1mm magnesia-calcium sand (CaO 56.5%, MgO 36.4%) 5%,

[0072] Magnesia (MgO 98%) ≤1mm 5%,

[0073] ≤0.088mm magnesia powder (MgO 98%) 20%,

[0074] Graphite 3%,

[0075] Aluminum powder ≤0.088mm 0.5%,

[0076] Silicon powder ≤0.088mm 0.5%,

[0077] Silicon carbide powder ≤0.088mm 0.5%,

[0078] Phenolic resin (moisture content 0.2%) 5.5%.

[0079] The manufacture method of high calcium magnesium calcium carbon brick is the same as embodiment 2.

[0080] The product testing results are shown in Table 1.

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Abstract

The invention relates to a high-calcium magnesite-dolomite carbon brick and a method for making the same. The invention adopts a technical proposal that the high-calcium magnesite-dolomite carbon brick is made from the following raw materials by weight percentage: 40 to 60 percent of 1 to 5mm calcium magnesite clinker, 5 to 15 percent of less than or equal to 1mm calcium magnesite clinker, 1 to 15 percent of less than or equal to 1mm magnesite clinker, 20 to 30 percent of less than or equal to 0.088mm magnesite powder, 2 to 8 percent of graphite, 0.5 to 3 percent of less than or equal to 0.088mm aluminum powder, 0.5 to 3 percent of less than or equal to 0.088mm silicon powder, 0.5 to 3 percent of less than or equal to 0.088mm silicon carbide powder and 3 to 6 percent of phenolic resin. The method comprises: mixing the raw materials uniformly according to a mixture ratio and pressing the well mixed raw materials into green bricks; keeping the green bricks at 220 DEG C for 4 to 7 hours and drying the green bricks for more than 20 hours totally; and performing hydration-proof treatment to the green bricks after the green bricks are moved out of a drying kiln. The brick is alkaline and can overcome the defects of molten steel pollution and unstable service life.

Description

Technical field: [0001] The invention relates to the field of refractory materials used in steel ladles (refining furnaces) in the metallurgical industry, in particular to the field of an alkaline high-calcium-magnesium-calcium-carbon brick and a manufacturing method thereof. Background technique: [0002] With the development of steelmaking technology and the emphasis on steel quality, the requirements for the cleanliness of molten steel are getting higher and higher. However, at present, most of the non-slag line parts used in domestic ladle walls are aluminum-magnesium-carbon unfired bricks. This kind of brick was developed earlier and has a wide variety. The pollution of molten steel and other aspects cannot meet the above requirements. Therefore, under the premise of ensuring the use, it is increasingly becoming an objective and realistic need to develop and develop refractory materials for ladle lining that are alkaline, reduce pollution of molten steel, and even play...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 付振才王鹏纪增杰屈政忱张威
Owner DASHIQIAO JINLONG REFRACTORY MATERIAL
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