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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AI-Extracted Technical Summary

Problems solved by technology

The disadvantage is that the process is complicated, the energy...

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.

Technology Topic

AluminiumSulfite +12

Examples

Experimental program(6)

Example Embodiment

[0011] Example 1 A periclase-iron-aluminum spinel brick and its preparation method: first mix 76-84wt% magnesia and 10-17wt% Al 2 O 3 , 5-10wt% of Fe is mixed, 3wt% of sulfite pulp waste liquid binder is added, and then kneaded, shaped, dried, and then reacted and fired in situ at 1300-1600°C.

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

[0013] The bulk density of the bricks prepared in Example 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%. XRD test result is periclase as the main crystal phase, FeAl is also detected 2 O 4 And MgFe 2 O 4 , MgAl 2 O 4 Solid solution with a small amount of Fe 2 O 3 And Fe 3 O 4.

Example Embodiment

[0014] Example 2

[0015] A periclase-iron-aluminum spinel brick and its preparation method: first mix 70-82wt% of magnesia and 10-17wt% of Al 2 O 3 , 0.5~6wt% Fe, 5~10wt% Fe 2 O 3 Mixing, adding 3wt% sulfite pulp waste liquid binder, kneading, molding, drying, and then reacting and sintering in situ at 1350-1650°C.

[0016] In this example 2: the 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 bulk density of the bricks prepared in Example 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%. XRD test result is periclase as the main crystal phase, FeAl is also detected 2 O 4 And MgFe 2 O 4 , MgAl 2 O 4 Solid solution with a small amount of Fe 2 O 3 And Fe 3 O 4.

Example Embodiment

[0018] Example 3

[0019] A periclase-iron-aluminum spinel brick and its preparation method: first mix 55-70wt% of magnesia, 5-14wt% of Al 2 O 3 , 10-25wt% iron-aluminum spinel, 0.5-7wt% Fe mixed, plus 3wt% sulfite pulp waste liquid binder, then kneading, molding, drying, and then in situ at 1300-1600℃ Reaction firing.

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

[0021] The bulk density of the bricks prepared in Example 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 results show that the main crystal phases are periclase and iron-aluminum spinel, and FeAl is also detected 2 O 4 And MgFe 2 O 4 , MgAl 2 O 4 Solid solution with a small amount of Fe 2 O 3 And Fe 3 O 4.

PUM

Property	Measurement	Unit
Bulk density	>= 3.15	g/cm³
Bulk density	>= 3.13	g/cm³
Compressive strength	60.0 ~ 70.0	mPa

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Simple process
Energy saving

Periclase-ferroalumina spinal brick and its making process

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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