Tundish working lining castable and preparation method thereof
A working lining and castable technology, applied in the field of refractory materials, can solve the problems affecting the production scheduling of steel plants, economic losses, spalling, etc., so as to shorten the curing time and baking time, reduce the unit water consumption, and increase the rheological properties. Effect
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[0031] The present invention also provides a method for preparing the tundish working lining castable as described in any one of the above, comprising the following steps:
[0032] S1) According to the parts by weight, mix 1-3mm magnesia or forsterite sand, magnesia or forsterite sand with a particle size of 0.1-1mm, stir, add a binder and stir evenly, and obtain the mixture;
[0033] S2) Add magnesia with a particle size not greater than 0.075mm into the mixture, then add plasticizer, composite fiber and composite water reducer, and stir evenly to obtain a tundish working lining castable.
[0034] The composite water reducing agent provided by the present invention, by selecting a variety of polymer materials with branched chain structures, through compounding, is adsorbed on the particle surface, increases the ξ potential of the particle surface, increases the mutual repulsion between the particles, and releases the The free water wrapped in the condensed structure composed ...
Embodiment 1
[0038] For the preparation of sample 1, according to the parts by weight, 28 parts of magnesia with a particle size of 1-3mm and 30 parts of magnesia with a particle size of 0.1-1mm were stirred, and 5 parts of a binder were added, and the mixture was obtained after stirring evenly;
[0039] Add 32 parts of magnesia with a particle size not greater than 0.075 mm into the mixture, then add 3 parts of plasticizer, 1.5 parts of composite fiber and 0.5 part of composite water reducer, and stir evenly to obtain a tundish working lining castable.
[0040] The composite water reducer is blocked polyurethane, acrylic resin and azobisisoheptanonitrile, and the mass ratio of blocked polyurethane, acrylic resin and azobisisoheptanonitrile is 75:25:0.1; the composite fiber is paper fiber, jute fiber, Straw fiber and organic fiber; the mass ratio of paper fiber, jute fiber, straw fiber and organic fiber is 2:4:4:1; the plasticizer is bentonite, dextrin and red clay; the mass ratio of benton...
Embodiment 2
[0044]For the preparation of sample 2, according to the parts by weight, 28 parts of magnesia with a particle size of 1-3mm and 30 parts of magnesia with a particle size of 0.1-1mm were stirred, and 5 parts of binder were added, and after stirring evenly, a mixture was obtained;
[0045] Add 32 parts of magnesia with a particle size not greater than 0.075 mm into the mixture, then add 3 parts of plasticizer, 1.5 parts of composite fiber and 0.2 part of composite water reducer, and stir evenly to obtain a tundish working lining castable.
[0046] The composite water reducer is blocked polyurethane, acrylic resin and azobisisoheptanonitrile, and the mass ratio of blocked polyurethane, acrylic resin and azobisisoheptanonitrile is 75:25:0.1; the composite fiber is paper fiber, jute fiber, Straw fiber and organic fiber; the mass ratio of paper fiber, jute fiber, straw fiber and organic fiber is 2:4:4:1; specifically, the plasticizer is bentonite, dextrin and red clay; bentonite, dex...
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