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Magnesium-aluminum ramming material for rh furnace

A technology of ramming material and magnesium aluminum, which is applied in the field of refractory materials, can solve problems such as temperature fluctuations, furnace wall damage, and accelerated furnace lining damage, and achieve the effects of improving thermal shock resistance, improving high-temperature performance, and improving medium-temperature strength

Active Publication Date: 2016-02-03
上海彭浦特种耐火材料厂有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The intermittent operation of RH will cause temperature fluctuations, and the material is required to have excellent thermal shock resistance; the RH furnace is equipped with an argon stirring device, and the furnace wall is seriously damaged at the place where the argon is blown and nearby parts. In addition, molten steel and slag are caused by stirring The violent boiling will accelerate the damage of the furnace lining, so the refractory material is required to have higher high temperature strength

Method used

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  • Magnesium-aluminum ramming material for rh furnace
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  • Magnesium-aluminum ramming material for rh furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1. The introduction of PT-10 increases the plasticity of magnesium-aluminum ramming materials (as shown in Table 1)

[0014] Table 2

[0015]

Embodiment 2

[0016] Embodiment 2. has improved the high-temperature performance of material:

[0017]

Embodiment 3

[0018] Embodiment 3. Due to the high activity of nano-silica, nano-silica is used, which can promote the reaction of activated alumina and magnesium oxide fine powder to produce magnesia-aluminum spinel at a lower temperature, which can be produced at low temperature. Certain sintering, thus improving the medium temperature strength of the material (Table 4).

[0019] Table 4

[0020]

[0021] It should be emphasized that:

[0022] ①Due to the decreasing reserves of high-grade chrome ore, the price of fused magnesia-chrome sand continues to rise. In the case of equivalent service life, the price advantage of the magnesium-aluminum ramming material described in the present invention is more obvious. In addition, The environmental protection of the magnesium-aluminum ramming material makes the magnesium-aluminum ramming material have a good cost performance, so it will have a good application prospect.

[0023] ②The amount of PT-10 added in the above-mentioned examples is j...

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Abstract

The invention relates to a magnesium-aluminum ramming material for an RH furnace. The magnesium-aluminum ramming material is characterized by being prepared from a base material, phosphate and PT-10 plasticizer; a) the base material is prepared by adding a binding agent prepared from nanosilicon dioxide and silica fume on the basis of grain-grading high-purity magnesia and adding corundum fine powder; b) the adding amount of phosphate is 0.30%; and c), the PT-10 plasticizer is co-produced by the Wuhan Shanda chemical plant and the German BASF limited company, and the adding amount of the PT-10 plasticizer is 0.2-1.0%; the organic plasticizer PT-10 is introduced to meet the construction performance of materials without affecting the high-temperature performance of the material; high strength at a low temperature is generated due to introduction of the binding agent; a substance with low melting phase cannot be generated at a high temperature, and thus the high-temperature performance of the material is improved; after the magnesium-aluminum ramming material is used in the Baosteel RH furnace for more than one year on trial, hundreds of tons of ramming materials are produced and completely meet the operating requirements through experiments.

Description

technical field [0001] The invention relates to a magnesium-aluminum ramming material for an RH furnace, which belongs to the field of refractory materials. Background technique [0002] The temperature of RH furnace refining is as high as 1600-1700°C, so the refractory material is required to have high refractory performance, not only can withstand the high temperature of 1600-1700°C and the impact of local overheating, but also requires the liquid phase of the refractory material to appear at high temperature. It can resist the erosion of low-viscosity slag, so the refractory material with high purity and direct bonding rate should be selected. The intermittent operation of RH will cause temperature fluctuations, and the material is required to have excellent thermal shock resistance; the RH furnace is equipped with an argon stirring device, and the furnace wall is seriously damaged at the place where the argon is blown and nearby parts. In addition, molten steel and slag ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 徐国令蓝振华刘晶赵芬林
Owner 上海彭浦特种耐火材料厂有限公司
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