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
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[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 spi...
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