Magnesium carbon-based castable
A castable, magnesium-carbon technology, applied in the field of magnesium-carbon castables and refractory castables, can solve the problems of poor oxidation resistance and high apparent porosity, and achieve strong oxidation resistance, low apparent porosity and high bulk density. Effect
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Embodiment 1
[0015] Step 1: Preparation of surface-modified graphite: mix 500 liters of resol aqueous solution and 1500 liters of aluminum monoacetate aqueous solution. The mixed solution contains 5% (weight percent) of phenolic resin and 20% (weight percent) of aluminum monoacetate. Put 200 kg of graphite and 10 kg of boron carbide (D50≤3 microns) into the mixed solution, stir evenly and filter, and dry the filtered graphite with a hot air dryer at a drying temperature of 250 degrees Celsius. Surface modified graphite is obtained after drying.
[0016] Step 2: The ingredients of the magnesium-carbon castable are (in parts by weight):
[0017] Surface modified graphite 12 parts, magnesia 72 parts, alumina powder 5 parts, aluminum magnesium spinel powder 5 parts, ρ-Al 2 O 3 2.5 parts, 1.5 parts of silica micropowder, 1 part of silica sol, 0.5 part of dispersed alumina M-ADS 1 and 0.5 part of dispersed alumina M-ADW 1 and mix the above materials except silica sol.
[0018] Step 3: Add 1 part of ...
Embodiment 2
[0021] Step 1: Preparation of surface-modified graphite: mix 1500 liters of resol aqueous solution and 500 liters of aluminum monoacetate aqueous solution. The mixed solution contains 20% (weight percent) of phenolic resin and 5% (weight percent) of aluminum monoacetate. Put 150 kg of graphite, 10 kg of boron carbide (D50≤3 microns), 20 kg of metallic silicon (D50≤10 microns), and 20 kg of silicon carbide (D50≤3 microns) into the mixed solution, stir evenly, and then filter. Dry the filtered material with a hot air dryer at a temperature of 150 degrees Celsius. Surface modified graphite is obtained after drying.
[0022] Step 2: The ingredients of the magnesium-carbon castable are (in parts by weight):
[0023] 6 parts of surface-modified graphite, 88 parts of magnesia, 3 parts of silicon carbide, 2.95 parts of silicon micropowder, and 0.05 parts of sodium hexametaphosphate. Mix the above materials except for silica sol.
[0024] Step 3: Add 5 parts of tap water to the above-menti...
Embodiment 3
[0027] Step 1: Preparation of surface-modified graphite: mix 1000 liters of resol aqueous solution and 1000 liters of aluminum monoacetate aqueous solution. The mixed solution contains 10% (weight percent) of phenolic resin and 10% (weight percent) of aluminum monoacetate. Put 200 kg of graphite (D50≤5 micron), 20 kg of boron carbide (D50≤1 micron), and 20 kg of silicon carbide (D50≤1 micron) into the above mixed solution, stir evenly, and then filter. Dry the filtered material with a hot air dryer at a temperature of 250 degrees Celsius. Surface modified graphite is obtained after drying.
[0028] Step 2: The ingredients of the magnesium-carbon castable are (in parts by weight):
[0029] Surface modified graphite 1 part, magnesia 93.8 parts, silicon carbide 3 parts, magnesium oxide powder 1.5 parts, silicon powder 0.5 parts, sodium hexametaphosphate 0.15 parts, sodium tripolyphosphate 0.05 parts, mix the above materials except silica sol uniform.
[0030] Step 3: Add 4.5 parts o...
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