HOT-PATCHING MATERIAL FOR SNORKEL OF VACUUM DEAERATION APPARATUS AND PATCHING METHOD USING SAME MATERIAL

摘要

PURPOSE:To prevent deterioration into a porous state by inserting a core into a snorkel, putting a patching material composed of a refractory filler, pitch and a specified thermoplastic phenol resin between the inner periphery surface thereof and the core and subsequently further adding a refractory filler thereto. CONSTITUTION:One or more materials selected from dolomite, spinel, zircon, etc., are used as the main material and one or more materials selected from a wetting agent, a dispersant, an antioxidant, limestone, a metal powder, an organic or inorganic fiber, etc., are added there to as necessary to obtain a refractory filler. With 100wt.% above-obtained refractory filler, 5-27wt.% pitch having about 5-0.1mm particle size and 1-10wt.% thermoplastic phenol resin having 40-58 deg.C melting point are blended so that the total quantity of the additives may be 8-30wt.%. A granular patching material is obtained thereby. The interior of a snorkel is then heated and a core is inserted from the lower part thereof after reaching a prescribed temperature. The above-mentioned granular patching material is put in between the inner periphery surface of the snorkel and the core and the above-obtained refractory filler further is added thereto. The patching work is completed without removal of the core after hardening of the patching material.