GAS BLOWING NOZZLE FOR MELTING AND REFINING FURNACE OR REACTIVE VESSEL

摘要

PURPOSE:To obtain the titled nozzle less in fluctuation of the quantity of blowing gas and small in wear of base material by inserting plural metallic pipes small in diameter into the nozzle main body consisting of refractory compositions and providing a heat insulating layer to the outer peripheral surface of the nozzle main body. CONSTITUTION:A nozzle main body consisting of a refractory 3 wherein the base material is MgO-C is provided to the upper end of an air accumulator 2 which is provided to the upper end of a gas feeding pipe 1. Plural metallic pipes 4 small in diameter are inserted into the refractory 3 on concentric circles at equal intervals and the lower ends of these pipes 4 are respectively opened to the inside of the air accumulator 2 and the upper ends are opened to the inside of a melting and refining furnace or a reactive vessel at the tip of the nozzle. A heat insulating layer 5 consisting essentially of metallic oxides which have high corrosion resistance for slag and low heat conductivity is provided to the outside peripheral surface of the nozzle in about 0.1-5mm. layer thickness. Thereby, the nozzle having a long life can be obtained and the operation is stably performed.