Launder for increasing flowing speed of molten steel by adding boron nitride
A technology of flow rate and boron nitride, which is applied in the field of metallurgy, can solve problems such as deterioration of alloy solidification structure and segregation, and achieve the effects of improving alloy purity, quality, and temperature reduction
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Embodiment 1
[0029] In the present embodiment, the launder preparation method of accelerating the flow rate of molten steel by adding boron nitride is as follows:
[0030] (1) 56.0% magnesium oxide, 34.5% aluminum oxide, and 9.0% boron nitride are uniformly mixed according to the following particle size weight percentages in a mixing tank.
[0031] In terms of weight percentage, the particle size distribution is: particle size<0.07mm accounts for 10%, 0.07mm≤particle size<1mm accounts for 15%, 1mm≤particle size<1.5mm accounts for 10%, 1.5mm≤particle size<2.5mm accounts for 10%, 2.5mm≤particle size<4mm accounted for 30%, 4mm≤particle size<7mm accounted for 20%, 7mm≤particle size<15mm accounted for 5%;
[0032] Among the above-mentioned refractory materials, the role of selecting specific proportions according to different particle sizes is to balance the strength, density, porosity, thermal expansion performance, and thermal shock resistance of the refractory moldings to ensure service life...
Embodiment 2
[0042] In the present embodiment, the launder preparation method of accelerating the flow rate of molten steel by adding boron nitride is as follows:
[0043] (1) 56.5% magnesium oxide, 33.5% aluminum oxide, and 9.4% boron nitride are uniformly mixed according to the following particle size weight percentages in a mixing tank.
[0044] In terms of weight percentage, the particle size distribution is: particle size<0.07mm accounts for 9%, 0.07mm≤particle size<1mm accounts for 16%, 1mm≤particle size<1.5mm accounts for 9%, 1.5mm≤particle size<2.5mm accounts for 11%, 2.5mm≤particle size<4mm accounted for 29%, 4mm≤particle size<7mm accounted for 21%, 7mm≤particle size<15mm accounted for 5%;
[0045] (2) Add 0.6% boric acid with particle size <0.07mm to the mixed launder refractory material, and mix evenly again.
[0046] (3) Pour the mixture obtained in step (2) into the launder mold, and tamp it into shape; pay attention to adding the mixture at a height of 10-15mm each time, and...
Embodiment 3
[0053] In the present embodiment, the launder preparation method of accelerating the flow rate of molten steel by adding boron nitride is as follows:
[0054] (1) 54.6% magnesium oxide, 35% aluminum oxide, and 10% boron nitride are uniformly mixed according to the following particle size weight percentages in a mixing tank.
[0055] In terms of weight percentage, the particle size distribution is: particle size<0.07mm accounts for 11%, 0.07mm≤particle size<1mm accounts for 14%, 1mm≤particle size<1.5mm accounts for 11%, 1.5mm≤particle size<2.5mm accounts for 9%, 2.5mm≤particle size<4mm accounted for 30%, 4mm≤particle size<7mm accounted for 19%, 7mm≤particle size<15mm accounted for 6%;
[0056] (2) Add 0.4% boric acid with particle size <0.07mm into the mixed launder refractory material, and mix evenly again.
[0057] (3) Pour the mixture obtained in step (2) into the launder mold, and tamp it into shape; pay attention to adding the mixture at a height of 10-15mm each time, and...
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