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Preparation method of magnesium spinet zirconium brick

A technology of magnesia spinel and zirconium bricks, which is applied in the field of preparation of magnesia spinel and zirconium bricks, can solve the problem of poor slag erosion resistance, unsatisfactory thermal spalling resistance and acid slag resistance of magnesia-zirconium bricks, magnesium tip Spar bricks have poor anti-scouring and anti-slag erosion performance, so as to achieve the effect of eliminating pollution

Active Publication Date: 2013-05-15
江苏诺明高温材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] From the perspective of cost performance, magnesia spinel bricks, magnesia-zirconia bricks or magnesia-spinel-zirconia bricks are most likely to replace recombined magnesia-chrome bricks. The slag erosion performance is very bad; the thermal spalling resistance and acid slag resistance of magnesia-zirconium bricks are not ideal
Simply combining spinel and ZrO 2 The combined magnesia spinel zirconium bricks also have the defect of poor slag erosion resistance

Method used

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  • Preparation method of magnesium spinet zirconium brick
  • Preparation method of magnesium spinet zirconium brick
  • Preparation method of magnesium spinet zirconium brick

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 30% of 98 large crystal fused magnesia, 30% of α-Al 2 o 3 After the fine powder and 40% fused monoclinic zirconium are fully mixed, 1% pulp is added as a binder, pressed into a block at 200MPa, kept at 1720°C for 12 hours to burn the eutectic sand, and then the eutectic sand is ground to ≤0.0425 mm of fine powder, then use fused magnesia as aggregate, add 2.8% of eutectic fine powder and 1% of monoclinic zirconium powder, and keep sintering at 1720°C for 6 hours in an ultra-high temperature tunnel kiln to prepare a new type of magnesium For spinel zirconium bricks, the above ratios are all mass ratios. The chemical composition of the raw materials used in the test is shown in Table 1, and the composition of the samples is shown in Table 2.

[0021] Table 1 The chemical composition (w) of raw materials used in the test

[0022]

[0023] The batch composition (w) of table 2 sample

[0024]

Embodiment 2

[0026] It will be 30% of 98 large crystal fused magnesia, 30% of α-Al 2 o 3 After the fine powder and 40% fused monoclinic zirconium are fully mixed, 2% pulp is added as a binder, pressed into a block at 200MPa, kept at 1760°C for 13 hours to burn the eutectic sand, and then the eutectic sand is ground to ≤0.0425 mm of fine powder, then use fused magnesia as aggregate, add 3% of eutectic fine powder and 2% of monoclinic zirconium powder, and burn it in an ultra-high temperature tunnel kiln at a temperature of 1720°C for 6 hours to prepare a new type of magnesium For spinel zirconium bricks, the above ratios are all mass ratios. The chemical composition of the raw materials used in the test is shown in Table 1, and the composition of the samples is shown in Table 2.

Embodiment 3

[0028] It will be 30% of 98 large crystal fused magnesia, 30% of α-Al 2 o 3 After the fine powder and 40% fused monoclinic zirconium are fully mixed, 3% pulp is added as a binder, pressed into a block at 200MPa, kept at 1815°C for 14 hours to burn the eutectic sand, and then the eutectic sand is ground to ≤0.0425 mm of fine powder, then use fused magnesia as aggregate, add 3.5% of eutectic fine powder and 3% of monoclinic zirconium powder, and burn it in an ultra-high temperature tunnel kiln at a temperature of 1720°C for 6 hours to prepare a new type of magnesium For spinel zirconium bricks, the above ratios are all mass ratios. The chemical composition of the raw materials used in the test is shown in Table 1, and the composition of the samples is shown in Table 2.

[0029] The new magnesia spinel zircon brick (MAZ) and spinel brick (MgO-Al 2 o 3 (MA)) and magnesia-zirconium bricks (MgO-ZrO 2 (MZ)) for performance comparison, see Table 3 and Figure 1-Figure 3 .

[00...

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Abstract

The invention discloses a preparation method of a magnesium spinet zirconium brick. The preparation method comprises the following steps of: fully mixing 30% of electro-fused magnesite, 30% of alpha-Al2O3 micropowder and 40% of electro-fused monocline zirconium, then adding a binding agent, pressing into blocks under 200MPa, sintering into co-crystallizing sand during insulating the temperature of 1720-1815 DEG C for 12-14hours, grinding the co-crystallizing sand into fine powder with particle size of no more than 0.0425mm, taking the electro-fused magnesite as aggregate, adding 2.8-3.5% of co-crystallizing fine powder and 1-3% of monocline zirconium powder, insulating at the temperature of 1720 DEG C for 6hours in an ultrahigh-temperature tunnel kiln, and sintering for preparing a novel magnesium spinet zirconium brick. The novel magnesium spinet zirconium brick has excellent high-temperature strength, structure stripping resistance and thermal shock resistance stability, slag scouring resistance property, and is environment-friendly and safe, and the pollution of the hexavalent chromium can be thoroughly eliminated.

Description

technical field [0001] The invention relates to a refractory material for a cement rotary kiln, a lower tank of a RH (vacuum cycle degassing and refining) furnace, and a dipping pipe, in particular to a magnesia spinel zirconium brick material. Background technique [0002] Hexavalent chromium pollution, as an internationally recognized environmental problem, has received more and more attention from all countries. my country's environmental protection standard GB18918-2002 stipulates that the basic control standard for water pollutant discharge of urban sewage treatment plants: the maximum discharge concentration (daily average value) of class I pollutants is less than 0.1mg / L for total chromium, and less than 0.05mg / L for hexavalent chromium. [0003] Fused magnesia chrome brick (MgO-Cr 2 o 3 Bricks) are widely used in cement rotary kilns, RH furnaces, etc. due to their superior performance. However, after use, fused magnesia-chrome bricks will produce carcinogen hexava...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/622
Inventor 尹国祥蒋菊芳
Owner 江苏诺明高温材料股份有限公司
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