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Magnesia zircon brick and preparation method thereof

A technology of magnesia-zirconium bricks and fused magnesia, which is applied in the field of refractory materials and can solve problems such as complex internal environment, increased costs, and harsh refining conditions

Inactive Publication Date: 2017-10-24
长兴泓矿炉料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the RH refining conditions are very harsh, forcing its lining to be directly bonded or rebonded with magnesia-chrome bricks. Produces highly toxic hexavalent chromium, hexavalent chromium is poisonous and soluble in water, and there is a danger of chromium treatment water being mixed into tap water, which is a refractory material harmful to the environment
[0003] Therefore, in order to eliminate the environmental pollution caused by chromium-containing refractory materials during production and use, people urgently need to seek a chromium-free, environmentally friendly material to gradually replace the use of magnesia-chrome bricks in high-temperature kilns. However, RH refining furnace smelting The internal environment of steel is very complicated, and the refining conditions are very harsh. After the rapid change of thermal stress and the erosion of high-basic slag, most of the materials cannot be used due to erosion and damage. At this time, they need to be repaired and replaced. Reduce production efficiency and increase costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A magnesia-zirconium brick, comprising the following components in parts by weight:

[0036] 40 parts of corundum particles, 35 parts of fused magnesia particles, 2 parts of a-alumina powder, 5 parts of zirconia, 1 part of silica powder, nano-Fe 2 o 3 15 parts of powder, 2 parts of sodium carboxymethyl starch, 1 part of aluminum tripolyphosphate, 0.5 parts of yttrium oxide, and 3 parts of calcium lignosulfonate.

[0037] Wherein, the silica powder has been modified, and the modified treatment includes the following steps: mixing sodium tetrapropylene benzene sulfonate with water, configuring a modifier with a concentration of 0.1mol / L, and then mixing The modifier and the silica powder were mixed at a mass ratio of 1:1, and then stirred at 90° C., with a stirring speed of 450 r / min, and a stirring time of 2 hours.

[0038] Wherein, described sodium carboxymethyl starch adopts following method to prepare:

[0039]a. the monochloroacetic acid of 20 weight parts is mixe...

Embodiment 2

[0053] A magnesia-zirconium brick, comprising the following components in parts by weight:

[0054] 50 parts of corundum particles, 40 parts of fused magnesia particles, 10 parts of a-alumina powder, 8 parts of zirconium dioxide, 2 parts of silica powder, nano Fe 2 o 3 15-25 parts of powder, 5 parts of sodium carboxymethyl starch, 1 part of aluminum tripolyphosphate, 1 part of yttrium oxide, and 4 parts of calcium lignosulfonate.

[0055] Wherein, the silica powder has been modified, and the modified treatment includes the following steps: mixing sodium tetrapropylene benzene sulfonate with water, configuring a modifier with a concentration of 0.1mol / L, and then mixing The modifier and the silica powder were mixed at a mass ratio of 1:1, and then stirred at 90° C., with a stirring speed of 450 r / min, and a stirring time of 2 hours.

[0056] Wherein, described sodium carboxymethyl starch adopts following method to prepare:

[0057] a. the monochloroacetic acid of 20 weight p...

Embodiment 3

[0071] A magnesia-zirconium brick, comprising the following components in parts by weight:

[0072] 50 parts of corundum particles, 37 parts of fused magnesia particles, 6 parts of a-alumina powder, 7 parts of zirconia, 1 part of silica powder, nano-Fe 2 o 3 20 parts of powder, 4 parts of sodium carboxymethyl starch, 1 part of aluminum tripolyphosphate, 1 part of yttrium oxide, and 4 parts of calcium lignosulfonate.

[0073] Wherein, the silica powder has been modified, and the modified treatment includes the following steps: mixing sodium tetrapropylene benzene sulfonate with water, configuring a modifier with a concentration of 0.1mol / L, and then mixing The modifier and the silica powder were mixed at a mass ratio of 1:1, and then stirred at 90° C., with a stirring speed of 450 r / min, and a stirring time of 2 hours.

[0074] Wherein, described sodium carboxymethyl starch adopts following method to prepare:

[0075] a. the monochloroacetic acid of 20 weight parts is mixed ...

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Abstract

The invention relates to the technical field of refractory materials. A magnesia zircon brick is prepared from the following components in parts by weight: 40 to 50 parts of alundum particles, 35 to 40 parts of fused magnesia particles, 2 to 10 parts of a-alumina micro powder, 5 to 8 parts of zirconium dioxide, 1 to 2 parts of fine silica powder, 15 to 25 parts of Fe2O3 powder, 2 to 5 parts of binding agents, 0 to 1 part of water reducing agent, 0.5 to 1 part of yttrium oxide, and 3 to 4 parts of calcium lignosulfonate. The invention also provides a preparation method of the magnesia zircon brick. The preparation method of the magnesia zircon brick comprises the following steps of: mixing raw materials, mixing and stirring in a blender mixer to obtain a mixture, then putting the mixture into a mold, performing pressing moulding, preheating a pressed green body, and then sintering the green body to obtain a finished product. The magnesia zircon brick and the preparation method thereof have the advantages of no pollution, high temperature resistance, corrosion resistance and thermal shock resistance.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a magnesia-zirconium brick and a preparation method thereof. Background technique [0002] Among various refining methods outside the furnace, the RH vacuum circulation degassing method is favored by steel mills for its advantages such as good degassing effect, small temperature drop of molten steel, wide application range, flexible equipment operation, stable and reliable operation, etc. However, the RH refining conditions are very harsh, forcing its lining to be directly bonded or rebonded with magnesia-chrome bricks. Produces highly toxic hexavalent chromium, hexavalent chromium is poisonous and soluble in water, and there is a danger of chromium treatment water being mixed into tap water, which is a refractory material that is harmful to the environment. [0003] Therefore, in order to eliminate the environmental pollution caused by chromium-containing refractor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/106C01B33/12C01G49/06B82Y30/00C08B31/12
CPCC04B35/106B82Y30/00C01B33/12C01G49/06C04B2235/3206C04B2235/3225C04B2235/3244C04B2235/3272C08B31/12
Inventor 佘建锋
Owner 长兴泓矿炉料有限公司
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