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US 8,025,824 B2Granted
Process for producing refractory particles
AssigneeAgc Ceramics Co., Ltd.
InventorYukihiro Ushimaru
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AssigneeAgc Ceramics Co., Ltd.
InventorYukihiro Ushimaru
Estimating the term…
To provide a process for producing high-purity highly oxidized refractory particles easily with good productivity by treating a spent refractory containing ZrO2 and Al2O3 to reduce components other than ZrO2 and Al2O3 to levels unproblematic for practical use as raw material for electrofused refractories and to increase the content of the ZrO2 and/or Al2O3 component. A process for producing refractory particles, which comprises introducing to and melting in a melting furnace both a spent refractory which contains, by mass % as chemical components, from 75 to 97% of ZrO2 and/or Al2O3, from 2 to 25% of SiO2, from 0.4 to 7% in total of Na2O, K2O and Li2O(Na2O+K2O+Li2O), at most 2% of CaO and at most 2% of MgO, and carbon particles in an amount of from 1 to 8% by outer mass percentage based on the spent refractory, and after the melting, tapping the melt while blowing compressed air against the melt to form refractory particles having the content of ZrO2 and/or Al2O3 increased.
A process for producing refractory particles, which comprises introducing to and melting in a melting furnace both a spent refractory which contains, by mass % as chemical components, from 75 to 97% of at least one of ZrO2 and Al2O3, from 2 to 25% of SiO2, from 0.4 to 7% in total of Na2O, K2O and Li2O, at most 2% of CaO and at most 2% of MgO, wherein mass % is based on the total mass of the ZrO2, the Al2O3, the SiO2, the Na2O, the K2O, the Li2O, the CaO and the MgO, and carbon particles in an amount of from 1 to 8% by mass percentage, wherein mass percentage is based on the total mass of the spent refractory, and after the melting,
Dependencies are inferred from the claim text.