Method for preparing magnesium iron aluminum composite material from sulfuric-acid slag
A technology of sulfuric acid slag and composite materials, which is applied in the field of refractory materials, can solve the problems of high cost and difficulty in the synthesis of iron-aluminum spinel, and achieve the effects of high pass rate, excellent thermal shock stability and good wear resistance
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Embodiment 1
[0027] (1) Grind the sulfuric acid slag with water to a certain particle size. After the slurry is evenly stirred, the material A is obtained through magnetic separation, and the material A is washed with water to obtain the material B. Grind material B and magnesite into fine powder with a particle size of 325 mesh, where w(B):w(magnesite)=(7~15)%:(86~94)%, plus 1% dextrin Dry powder, after mixing, grind for 6h-18h, add 3% binder, press into adobe, after drying, heat it under oxidizing atmosphere at 1450°C-1730°C for a certain period of time to obtain material C;
[0028] (2) In terms of mass percentage, 70% of material C, 20% of magnesia, 7% of fused magnesia-alumina spinel, and 3% of tabular corundum are mixed in proportion, and 3% of pulp solution is added as a binder. During production, first weigh various raw materials according to the proportion, mix them evenly, and get the mud material through mixing, and then press it into shape with a friction press. High temperatu...
Embodiment 2
[0032] The production technology of the present embodiment is identical with embodiment 1, and difference is:
[0033] In terms of mass percentage, 60% of material C, 25% of magnesia, 12% of fused magnesia-aluminum spinel, 3% of tabular corundum, and 3% of pulp solution are used as binders.
[0034] The material C has four particle sizes of 5-3mm, 3-1mm, 1-0mm and ≤0.088mm, the magnesia has two particle sizes of 1-0mm and ≤0.088mm, and the fused magnesia-aluminum spinel is 3-1mm, the particle size of the tabular alumina is 3-1mm.
[0035] The performance indicators of the obtained product are: apparent porosity 15.8%, bulk density 3.01g / cm3, normal temperature compressive strength 73MPa, load softening temperature greater than 1680°C, thermal shock stability (1100°C, water cooling) 15 times, and its corrosion resistance , oxidation-reduction resistance, creep resistance and kiln-hanging skin performance are all good.
Embodiment 3
[0037] Production technology is identical with embodiment 1, and difference is:
[0038] In terms of mass percentage, 50% of material C, 32% of magnesia, 13% of fused magnesia-aluminum spinel, 5% of tabular corundum, and 3% of pulp solution are used as a binder.
[0039] The material C has four particle sizes of 5-3mm, 3-1mm, 1-0mm and ≤0.088mm, the magnesia has two particle sizes of 3-1mm, 1-0mm and ≤0.088mm, and the fused magnesia The spinel is 3-1mm, and the particle size of the tabular alumina is 3-1mm.
[0040] The performance indicators of the obtained product are: apparent porosity 16.3%, bulk density 3.0g / cm3, normal temperature compressive strength 70MPa, load softening temperature greater than 1680°C, thermal shock stability (1100°C, water cooling) 14 times, and its corrosion resistance , oxidation-reduction resistance, creep resistance and kiln-hanging skin performance are all good.
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Abstract
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