Concentrate nozzles for smelting furnaces

Abstract

The invention discloses a concentrate jet nozzle of a smelting furnace. The concentrate jet nozzle comprises an oxygen supply pipe, a dispersing air pipe and a water-cooled jacket, all of which are coincident in pipe cores, orderly increased in pipe diameter and orderly arranged to sleeve each other, wherein an air supply channel extends from the feeding hole of the water-cooled jacket into the feeding tubular cavity of the water-cooled jacket; the air outlet of the air supply channel is located at the lower portion of the feeding tubular cavity. As the air supply channel is arranged in the feeding tubular cavity of the water-cooled jacket, compressed air can be premixed with mineral aggregate in the feeding tubular cavity when being discharged from the lower portion of the feeding tubular cavity via the air supply channel, and then the premixed mineral aggregate is further mixed with process air in a process air box, and therefore, the homogeneity of mixing of the mineral aggregate with the process air can be effectively improved, furthermore, the combustion effect of the mineral aggregate is further improved, and the mass transfer and heat transfer rates in the reaction tower are intensified; as a result, the generation rate of smoke dust and SO3 in the smoke dust can be effectively reduced, the difficulty of subsequent smoke dust treatment is reduced, and the capacity of matte obtained by smelting is improved.

Description

technical field [0001] The invention relates to the technical field of copper smelting, in particular to a concentrate nozzle of a smelting furnace. Background technique [0002] In the copper flash smelting process, a concentrate nozzle and a process wind box for blasting process air are installed on the top of the smelting furnace, and copper concentrate ore, oxygen and dispersing air are sprayed into the smelting furnace through the concentrate nozzle. In the lower part of the concentrate nozzle, the ore material is mixed with the process air and burned to form slag and matte, and the ore material and the process air are fully mixed, which means that the ore material undergoes a rapid and complete oxidation reaction in the limited space below the concentrate nozzle one of the important conditions. [0003] At present, most of the concentrate nozzles used by copper mining enterprises are central diffuse concentrate nozzles designed and produced by Outokumpu Company of Fin...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the concentrate nozzles used by copper mining enterprises are central diffuse concentrate nozzles designed and produced by Outokumpu Company of Finland, such as figure 1 As shown, the feature of the concentrate nozzle is that the mineral material and the process air are sprayed into the furnace in the same direction, and the purpose of mixing is mainly achieved through the interdiffusion and infiltration of the gas phase and the solid phase. Using this central diffusion concentrate nozzle for low-level spraying In other words, when the injection inlet of the mineral material is close to the outlet of the process air, the mixture of the mineral material and the process air is easier, but when the material is sprayed at a high position, that is to say, the injection inlet of the mineral material is higher, and there is still a certain distance between the injection inlet of the mineral material and the outlet of the process air. When the height difference is high, the reaction time of the mineral material is relatively delayed at this time. In addition, when the input amount of the mineral material is small, the mineral material entering the furnace can be quickly heated to the reaction temperature by the high-temperature flue gas or radiant heat in the furnace, and the fine Vigorous combustion reactions begin to occur within about 1.5m of the outlet of the ore nozzle, and when the amount of mineral material input is large, it is difficult to ensure that the mineral material and the process air can be fully mixed within the limited space of the feed inlet at the top of the reaction tower. As a result, the mass transfer and heat transfer rate of the combustion reaction are greatly affected, which not only causes the content of ferric oxide in the slag to increase, the soot rate to 3 The formation rate increases, and the utilization efficiency of oxygen also decreases significantly, which in turn affects the production capacity of the smelted product matte

Images