Composite combined magnesium carbon brick and preparation method thereof
A technology of magnesia-carbon bricks and binders, which is applied in the field of refractory materials, can solve problems such as inability to evenly distribute magnesia-carbon bricks, agglomeration, and limited addition of asphalt powder, and achieve excellent thermal shock resistance, reduce agglomeration, The effect of good performance
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Embodiment 1
[0027] Embodiment 1 Preparation of graphitized pitch
[0028] Take an appropriate amount of medium-temperature asphalt, put it into a high-pressure reactor, set the maximum pressure to 5 standard atmospheres, keep stirring and raise the temperature to 420°C, and keep it warm for 3 hours. During this period, the distillate is distilled through the pressure relief valve; , slowly release the pressure to normal pressure, control the temperature within the range of 350~400°C for vacuum distillation, distill out low molecular volatiles, and the remaining material in the equipment is graphitized pitch.
Embodiment 2
[0029] Example 2 Preparation of composite bonded magnesia carbon brick
[0030] Add 70% of magnesia with particle size less than or equal to 5mm, 4% of phenolic resin binder, 24% of -197 graphite and 2% of graphitized asphalt powder into the countercurrent mixer in sequence, start the countercurrent mixer, and mix for 25 minutes. Mixed material; put the mixed material into a press mold, pressurize and form it to obtain a magnesia-carbon brick adobe; put the magnesia-carbon brick adobe into a tunnel kiln to bake, control the temperature at 160°C, and the total time is not less than 12 hours to obtain The product is a combination of magnesia carbon bricks. The product has high cold strength after high temperature carbonization, and is suitable for ladle bottom, cladding wall and slag line.
Embodiment 3
[0031] Example 3 Preparation of Composite Bonded Magnesia Carbon Bricks
[0032] Start the counter-current mixer, add 92.5% magnesia with particle size less than or equal to 3mm, 2.5% phenolic resin binder, and 5% graphitized asphalt powder into the counter-current mixer in sequence, mix for 8 minutes and then discharge the mixture; put the mixture Put the magnesia-carbon brick into the mold of the press, press and form it to get the adobe of magnesia-carbon brick; put the adobe of the magnesia-carbon brick into the kiln and bake it to 340°C, keep it warm for 5 hours, and get the product composite bonded magnesia-carbon brick. The residual carbon of this product is about 5%. Compared with ordinary low-carbon magnesia carbon bricks, the spalling resistance is significantly improved, and it is suitable for the slag line of the refining ladle.
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