Oxygen lance for smelting of molten pool

Abstract

The invention provides an oxygen lance for smelting of a molten pool and belongs to the technical field of oxygen blowing of smelting of non-ferrous metal molten pools and the technical field of blowing of smelting of steel. The oxygen lance comprises a lance pipe. One end of the lance pipe is a gas supply pipe, and the other end of the lance pipe is an exhaust pipe. A plurality of spray holes are formed in the exhaust end of the lance pipe, and the lance pipe is formed by sintering silicon nitride powder. The structure of the lance pipe can be simplified by changing the material of the lance pipe, in addition, protective gas or other cooling protection devices are not needed in the oxygen lance, the oxygen utilization rate can be increased, gas supply pressure is reduced, and therefore the smelting cost is reduced.

Description

technical field [0001] The invention provides a novel oxygen lance for molten pool smelting, which belongs to the technical field of oxygen blowing in molten pool smelting of nonferrous metals and the technical field of iron and steel smelting blowing. Background technique [0002] Melting pool smelting is a smelting method in which the main reaction between gas-liquid-solid phases is rapidly completed in the liquid molten pool when fine sulfide concentrate is added to the melt, and air or industrial oxygen is blown into the melt for smelting. The gas supply method includes a top-blown spray gun or a spray gun buried in the molten pool. Air or industrial oxygen is sprayed into the molten pool from the oxygen lance, which not only participates in the reaction between gas-liquid-solid, but also inputs a large amount of stirring work to the high-temperature melt, so that the molten pool is strongly stirred, so as to facilitate the full mixing and rapid melting of materials . ...

AI Technical Summary

Problems solved by technology

[0004] (1) In actual use of the slotted multi-layer casing oxygen lance, when the pressure is low, the oxygen lance is prone to backfilling and blocking, and when the pressure is high, the molten pool is prone to splashing

[0005] (2) There are problems such as burning guns, blocking guns, and backflowing, which seriously affect the service life of oxygen guns. The frequency of furnace shutdown maintenance and gun replacement is high, and the cost of replacing oxygen guns and their sets of bricks is expensive. The shutdown of the furnace affects the normal production of equipment Big

[0006] (3) The oxygen gun uses a stainless steel casing, which has poor high temperature resistance and is prone to problems such as burning and erosion

[0008] (5) The structure of the oxygen lance is complex, which has high requirements for the design and operation of the gas supply system, piping system, control system, etc. of the molten pool melting furnace

Images