Permeable refractory nozzle and manufacturing method
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United States of America Patent
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Dec 10, 2002
Grant Date -
N/A
app pub date -
Nov 21, 2000
filing date -
Nov 22, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A permeable nozzle is made from MgO and MgO--Al.sub.2 O.sub.3 spinel and has a nonservice backpressure of about 0.5-50 psi at gas flowrates of about 5-20 liters/minute. In one embodiment, the permeable nozzle comprises about 50%-80% of about a 20-48.times.100 mesh MgO, about 5%-20% of about a 325 mesh MgO and about 5%-40% of about a 48.times.200 mesh MgO--Al.sub.2 O.sub.3 spinel. In another embodiment, the permeable nozzle comprises about 10%-20% of about a 20-48.times.100 mesh MgO, about 0%-10% of about a 325 mesh MgO, about 30%-60% of about a 28.times.48 mesh MgO--Al.sub.2 O.sub.3 spinel, about 10%-40% of about a 48.times.200 mesh MgO--Al.sub.2 O.sub.3 spinel, and about 10%-20% of about a 325 mesh MgO--Al.sub.2 O.sub.3 spinel.
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