Patent ID: 6251169
Filing Date: 2001-06-26
Classification: C21C

Abstract:
A vacuum/reduced pressure refining process using a vacuum/reduced pressure refining facility including a vacuum/reduced pressure refining vessel, a dry dust collector having a filter, a reduced pressure evacuating apparatus, an upstream duct connecting the vacuum/reduced pressure refining vessel and the dry dust collector, a freely opening/closing block valve disposed in the upstream duct, and a downstream duct connecting the dry dust collector and the reduced pressure evacuating apparatus, said vacuum/reduced pressure refining process comprising:closing a connection port of the vacuum/reduced pressure refining vessel prior to a start of a vacuum/reduced pressure refining treatment;establishing a hermetically closed state in the vacuum/reduced pressure refining facility from the vacuum/reduced pressure refining vessel to the block valve in the upstream duct;opening the block valve in the upstream duct after the hermetically closed state is established; andbringing the dust collector into operation.