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Periclase-ferroalumina spinal brick and its making process

A technology of iron-aluminum spinel and magnesia-aluminum spinel is applied in the field of periclase-iron-aluminum spinel brick and its preparation, which can solve the problems of complex process, low density, high energy consumption, etc. Simple process, high volume density, and energy saving effect

Inactive Publication Date: 2007-11-07
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the process is complicated, the energy consumption is large, and the density of the brick is not high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Example 1 A periclase-Fe-aluminum spinel brick and its preparation method: first mix 76-84wt% magnesia, 10-17wt% Al 2 o 3 , 5-10wt% of Fe, and 3wt% sulfurous acid pulp waste liquor binder, kneading, molding, drying, and then in-situ reaction firing at 1300-1600°C.

[0012] In this embodiment 1: the particle gradation of magnesia is, 5~0.088mm is 56~60wt%, 0.088~0mm is 20~24wt%; Fe and Al 2 o 3 The particle size is 0.088~0mm; the molding pressure is 150~250MPa.

[0013] The adobe bulk density prepared in the present embodiment 1 is 3.15g / cm 3 Above, the main physical properties after firing are: bulk density 3.13g / cm 3 Above, the apparent porosity is 14-16%, the compressive strength is 60-70MPa, and the linear change rate is 0.2-0.6%. The XRD test results showed that the main crystal phase was periclase, and FeAl was also detected 2 o 4 and MgFe 2 o 4 , MgAl 2 o 4 solid solution, and a small amount of Fe 2 o 3 and Fe 3 o 4 .

Embodiment 2

[0015] A periclase-iron-aluminum spinel brick and its preparation method: first, 70-82wt% magnesia, 10-17wt% Al 2 o 3 , 0.5-6wt% Fe, 5-10wt% Fe 2 o 3 Mixing, adding 3wt% sulfurous acid pulp waste liquor binder, kneading, molding, drying, and then in-situ reaction firing at 1350-1650°C.

[0016] In this embodiment 2: magnesia particle gradation is, 5~0.088mm is 53~58wt%, 0.088~0mm is 17~24wt%; Fe, Fe 2 o 3 and Al 2 o 3 The particle size is 0.088~0mm; the molding pressure is 100~300MPa.

[0017] The adobe bulk density prepared by present embodiment 2 is 3.14g / cm 3 Above, the main physical properties after firing are: bulk density 3.15g / cm 3 Above, the apparent porosity is 15-18%, the compressive strength is 55-60MPa, and the linear change rate is 0.3-0.9%. The XRD test results showed that the main crystal phase was periclase, and FeAl was also detected 2 o 4 and MgFe 2 o 4 , MgAl 2 o 4 solid solution, and a small amount of Fe 2 o 3 and Fe 3 o 4 .

Embodiment 3

[0019] A periclase-iron-aluminum spinel brick and its preparation method: first, 55-70wt% magnesia, 5-14wt% Al 2 o 3 , 10-25wt% iron-aluminum spinel, 0.5-7wt% Fe, plus 3wt% sulfurous acid pulp waste liquid binder, then kneading, molding, drying, and then in situ at 1300-1600°C The reaction is fired.

[0020] Among them: magnesia particle gradation is, 5~0.088mm is 30~35wt%, 0.088~0mm is 25~35wt%; Fe and Al 2 o 3 The grain size of the iron-aluminum spinel is 0.088-0mm; the particle gradation of the iron-aluminum spinel is 5-15wt% for 5-0.088mm, 5-10wt% for 0.088-0mm, and the molding pressure is 150-250MPa.

[0021] The adobe bulk density prepared in the present embodiment 3 is 3.15g / cm 3 Above, the main physical properties after firing are: bulk density 3.18g / cm 3 Above, the apparent porosity is 14-16%, the compressive strength is 55-95MPa, and the linear change rate is 0.1-0.5%. The XRD test results showed that the main crystal phases were periclase and iron-aluminum spi...

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Abstract

The present invention belongs to the field of refractory material technology, and is especially peiclase-ferroalumina spinel brick and its making process. The technological scheme is that the peiclase-ferroalumina spinel brick is made with magnesia 40-96 wt%, Al2O3 2-17 wt%, ferroalumina spinel or magnesia-alumina spinel 0-50 wt%, Fe 0.2-10 wt% and Fe2O3 0-10 wt%, and through mixing, adding sulfite pulp waste liquid in 2-8 wt%, mixing, forming, drying and in-site reaction sintering at 1000-2000 deg.c. The peiclase-ferroalumina spinel brick has simple making process, low power consumption, great bulk density and high strength.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a periclase-iron-aluminum spinel brick which is fired in situ by combining metal plasticity and a preparation method thereof. Background technique [0002] Cement rotary kilns have long used magnesia-chrome bricks as high-temperature kiln linings. In use, part of the chromium in the brick will change from Cr 3+ into highly toxic and carcinogenic Cr 6+ , thereby damaging the environment and threatening the health of the people. With the continuous enhancement of people's awareness of environmental protection, it is imperative to develop chromium-free alkaline bricks for cement kilns. In recent years, a lot of work has been done at home and abroad to find alternative materials for magnesia-chrome bricks, but the results are not ideal. The substitute materials are mainly dolomite refractories and magnesium aluminum spinel refractories. Although dolomite...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/043C04B35/44C04B35/443C04B35/64
Inventor 汪厚植顾华志杨斌
Owner WUHAN UNIV OF SCI & TECH
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