Preliminary melting type continuous casting crystallizer protecting slag and preparation thereof
A continuous casting mold and mold flux technology, which is applied in the field of pre-melted continuous casting mold mold flux and its preparation, can solve the problems of increased meniscus fluctuations, deterioration of billet quality, slag inclusion and wrinkled skin, etc., to achieve Good fluidity and spreadability, improved billet quality, and good thermal insulation performance
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[0027] Example 1
[0028] The composition of the mold powder is as follows:
[0029] SiO 2 34%, CaO 32.5%, MgO 4.1%, Fe 2O 3 0.8%, Al 2 O 3 3.5%, Na 2 O 9.3%, F 6.8%, Li 2 O 1.3%, C 5%, the balance is impurities.
[0030] Take 77 parts of molten material, 3.0 parts of lithium carbonate, 5.0 parts of sodium carbonate, 4.0 parts of sodium fluoride, 5.0 parts of fluorite, 2.5 parts of semi-reinforcing carbon black, and 3.5 parts of scaly graphite for every 100 parts of raw materials; crush the above raw materials To the particle size not greater than 300 mesh, then fully mix for 1 hour, add 2.5% sodium carboxymethyl cellulose as a binder, water mill for 2 hours to obtain a slurry with a concentration of 55%, and spray dry at 600°C to obtain the protection Scum.
Example Embodiment
[0031] Example 2
[0032] The composition of the mold powder is as follows:
[0033] SiO 2 34.8%, CaO 33.7%, MgO 4.3%, Fe 2 O 3 0.7%, Al 2 O 3 3.7%, Na 2 O 9.7%, F 6.1%, Li 2 O 1.0%, C 5.2%, the balance is impurities.
[0034] For every 100 raw materials, take 79 parts of molten material, 2.5 parts of lithium carbonate, 4.0 parts of sodium carbonate, 3.5 parts of sodium fluoride, 4.8 parts of fluorite, 2.4 parts of semi-reinforcing carbon black, and 3.8 parts of scaly graphite; crush the above raw materials To the particle size not greater than 300 mesh, then fully mix for 1 hour, add 2.2% sodium carboxymethyl cellulose as a binder, water mill for 2 hours to obtain a slurry with a concentration of 58%, which can be obtained after spray drying at 630°C Mold powder.
Example Embodiment
[0035] Example 3
[0036] The composition of the mold powder is as follows:
[0037] SiO 2 32.7%, CaO 32.0%, MgO 4.0%, Fe 2 O 3 0.47%, Al 2 O 3 4.1%, Na 2 O 10.3%, F 7.1%, Li 2 O 1.5%, C 5.3%, the balance is impurities.
[0038] Take 76 parts of molten material, 3.8 parts of lithium carbonate, 4.8 parts of sodium carbonate, 4.3 parts of sodium fluoride, 5.3 parts of fluorite, 2.8 parts of semi-reinforcing carbon black, and 3.0 parts of scaly graphite for every 100 parts of raw materials; crush the above raw materials To the particle size not greater than 300 mesh, then fully mix for 1h, add 3% sodium carboxymethyl cellulose as a binder, water mill for 2h to obtain a slurry with a concentration of 56%, and spray dry at 600℃ to obtain the Mold powder.
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