Secondary burning method and device in top blow sinking smelting process

Abstract

The present invention provides secondary burning method and device in top blowing and sinking smelting process. The method is to supplement secondary burning air with spray gun sleeve and furnace stoving nozzle simultaneously to make the combustibles inside the furnace burnt completely so as to recover heat fully. The device features that the spray gun sleeve is apart from the outlet of the spray gun by 6 m, and the furnace stoving nozzle has one increased blast blocking plate in the end to alter the direction of blast for complete burning.

Description

technical field [0001] The invention relates to non-ferrous metal metallurgical technology, in particular to a secondary combustion method and device in a top-blown sinking smelting process. Background technique [0002] Top-blown submerged smelting technology is also called top-blown submerged lance smelting technology (top submergedlance technology). It is an enhanced non-ferrous metal smelting technology successfully developed by Australia Ausmelt Company on the basis of Sirosmelt Technology. The basic process is to insert a specially designed spray gun from the top of the furnace into the melt in a fixed vertically placed cylindrical furnace, and the air and fuel are directly sprayed into the melt from the end of the spray gun to form a violent The tumbling molten pool is mixed with water and kneaded into agglomerates or lumps, and the charge is directly thrown into the molten pool in the furnace from the charging port on the top of the furnace. [0003] The feature of...

AI Technical Summary

Problems solved by technology

[0005] Due to the original design and supply of the key equipment - the spray gun, the sleeve is too long, the sleeve air pressure and air volume are relatively large, in the actual production process, the sleeve air is directly sprayed on the surface of the molten pool, on the one hand, the reducing agent is burned, and the reducing atmosphere Destroyed, slow reduction, waste of reducing agent

On the other hand, the air supply to the upper part of the furnace is insufficient, so that the combustible substances in the furnace flue gas cannot be completely combusted in the furnace. The device is often burned out, and the furnace is often forced to shut down, resulting in serious losses

At the same time, because a large amount of secondary combustion air is blown in by the sleeve and penetrates into the deep part of the furnace, many materials put into the furnace from the top of the furnace are blown back before falling into the molten pool, and are drawn into the flue gas by the draft. , increasing the smoke rate and reducing the recovery rate

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