Protective slag of large-profile round billet continuous-casting crystallizer and method for preparing same
A technology of mold mold slag and continuous casting mold, which is applied in the field of steelmaking auxiliary materials, can solve the problems of increased meniscus fluctuation, deterioration of billet quality, slag inclusion and wrinkled skin, etc., and achieves good fluidity and spreadability, Improve the quality of casting slab and good thermal insulation performance
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Embodiment 1
[0027] The technical scheme of the present invention is described below with specific examples, but protection scope of the present invention is not limited thereto:
[0028] Example 1
[0029] The composition of mold flux is as follows:
[0030] SiO 2 28.4%, CaO 29.9%, MgO 2.2%, Fe 2 o 3 1.2%, Al 2 o 3 7.5%, Na 2 O 4.8%, F 2.2%, MnO 1.7%, C 固 17.2%, H 2 O 0.33%, the balance is loss on ignition, K 2 O, TiO 2 and other impurities.
[0031] For every 100 parts of raw materials, take 62 parts of premelt, 8 parts of cement clinker, 5 parts of aluminum barium soil, 1 part of quartz powder, 2 parts of sodium carbonate, 1 part of fluorite, 2.5 parts of manganese carbonate, and 1.5 parts of semi-reinforcing carbon black , 17 parts of scaly graphite. Grind the above raw materials until the particle size is not more than 300 mesh, then mix them thoroughly for 1 hour, add 2.5% sodium carboxymethyl cellulose as a binder, and grind them with water for 2 hours to obtain a slurry w...
Embodiment 2
[0032] Embodiment 2 (Examples 2 and 3 change the mold powder composition within the allowable range)
[0033] The composition of mold flux is as follows:
[0034] SiO 2 31.1%, CaO 27.1%, MgO 2%, Fe 2 o 3 1.2%, Al 2 o 3 6.3%, Na 2 O 6.1%, F 3.4%, MnO 1.2%, C 固 17.5%, H 2 O 0.33%, the balance is loss on ignition, K 2 O, TiO 2 and other impurities.
[0035] For every 100 parts of raw materials, take 64 parts of premelt, 2.0 parts of cement clinker, 3.5 parts of alumina barium soil, 2.5 parts of quartz powder, 3.5 parts of sodium carbonate, 3.5 parts of fluorite, 2.0 parts of manganese carbonate, and 2.0 parts of semi-reinforcing carbon black , 17 parts of scaly graphite; the above raw materials are pulverized to a particle size of not more than 300 mesh, then fully mixed for 1 hour, adding 2.2% (added amount) sodium carboxymethyl cellulose as a binder, and milled for 2 hours to obtain a concentration of 58 % slurry, the mold powder can be obtained after spray drying. ...
Embodiment 3
[0037] The composition of mold flux is as follows:
[0038] SiO 2 31.5%, CaO 24.1%, MgO 1.2%, Fe 2 o 3 1.0%, Al 2 o 3 6.0%, Na 2 O 8.8%, F 3.5%, MnO 0.8%, C 固 18.0%, H 2 O 0.33%, the balance is K 2 O, TiO 2 etc. (impurities).
[0039] For every 100 parts of raw materials, take 60 parts of premelt, 3.0 parts of bauxite, 4.5 parts of quartz powder, 7.5 parts of sodium carbonate, 4.0 parts of fluorite, 1.5 parts of manganese carbonate, 2.5 parts of semi-reinforcing carbon black, and 17 parts of scaly graphite Grinding the above raw materials until the particle size is not greater than 300 mesh, then fully mixing for 1 hour, adding 3% sodium carboxymethyl cellulose as a binder, milling with water for 2 hours, to obtain a slurry with a concentration of 58%, and spray drying to obtain the obtained The above-mentioned mold powder.
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