A method for rapidly melting top-blown furnace knots

Abstract

A method for rapidly melting top-blown furnace knots is to insert a diesel burner (2) into a top-blown furnace (1), use diesel to burn to increase the furnace temperature, then continuously transport lump coal into the furnace, and use a spray gun (7) Supplement combustion-supporting oxygen-enriched air, diesel and lump coal burn simultaneously to release high heat to increase the temperature of the furnace, so that the surface layer of the furnace junction is melted to form a liquid molten pool; after that, the temperature at the top of the furnace is raised to 1300-1350 ° C, the diesel burner is turned off, and the spray gun is inserted into the In the liquid molten pool, stir the molten pool and fully burn the lump coal to eliminate the hidden danger of CO in the flue gas, and then start the diesel burner to support the combustion of the lump coal and CO in the flue gas, and continue to melt the furnace knot; then put in low-grade granular copper matte to release High heat and stir the molten pool to quickly melt the knots. When the knots in the slag discharge port area of ​​the top-blowing furnace are completely melted, the slag discharge port is fired to discharge the liquid melt until the knot faults are eliminated. The invention can quickly and safely melt high-melting-point furnace knots and improve production efficiency.

Description

technical field [0001] The invention relates to the technical field of nonferrous metallurgy, in particular to a method for rapidly melting copper smelting top-blowing furnace knots to eliminate dead furnace faults. Background technique [0002] The top-blown furnace has been widely used in industrial production due to its simple furnace structure, high operating flexibility, and strong adaptability to complex material processing, especially in the smelting and processing of complex copper concentrate materials. However, when processing copper concentrate materials with complex components and large fluctuations in impurity components, and when auxiliary facilities fail, it is very easy to cause overoxidation of the high-temperature melt in the top-blowing furnace, resulting in furnace knots and rapid production of a large amount of copper in a short period of time. The high melting point furnace junction will directly lead to dead furnace failure, making it difficult to main...

AI Technical Summary

Problems solved by technology

Directly use oil, natural gas, coal and other substances, and the high temperature generated by combustion can melt the furnace junction. This method can melt the situation where the thickness of the furnace junction is thin, but for the thickness of the furnace junction that exceeds a certain limit, due to the surface After melting, a liquid high-temperature melt is produced, and the heat transfer property of the melt is poor, so that it is impossible to further eliminate melting deep-seated furnace knots.

There is a method of directly melting the furnace junction by adding acidic or alkaline flux, but the disadvantage of this method is that the acidic or alkaline flux not only melts the furnace junction, but also reacts with the furnace wall refractory material to accelerate the melting of the furnace wall refractory material. Loss, there is a certain harm to the furnace body

There is also a method of using crushed iron powder to eliminate slag. Although this method is effective, it also has the disadvantages of consuming iron resources and increasing the amount of slag.

There is also a method of using copper sulfide concentrate and other similar materials to eliminate furnace knots. This requires the participation of silica flux, which not only produces a large amount of new slag, but also because copper sulfide concentrate has a light specific gravity and few active ingredients. The surface of the pool works, and there is little reaction to the elimination of knots at the bottom of the molten pool, which will result in long time-consuming and inefficient elimination of knots

There is also a method of using coke, lump coal, etc. to reduce and eliminate furnace knots. Whether coke, lump coal, etc. are directly sprinkled from the furnace top or sprayed into the molten pool, due to the light weight of reducing substances such as coke, lump coal, etc. Floating on the surface of the molten pool due to the melt, the actual chance of contact with the furnace junction reduction is small, and few of them can play an effective reduction role

Images