Method for smelting copper

Abstract

The invention provides a method of smelting copper. The method comprises the following steps: putting copper material (4) into a smelting furnace (1), infusing fuel and combustion-supporting gas to the smelting furnace (1) for increasing the temperature of the copper material (4) and then melting the copper material (4), and the method is characterized in that the fuel is infused into the smelting furnace (1) through a fuel injection pipe (2), while the combustion-supporting gas is infused into the smelting furnace (1) through a gas injection pipe (3), and the included angle a of the fuel injection pipe (2) and the wall (11) of the smelting furnace is 70-83 DEG, while the included angle b of the gas injection pipe (3) and the wall (11) of the smelting furnace is 70-83 DEG, wherein, the combustion-supporting gas is oxygen with a purity of more than 90%.The invention possesses the advantages that all the combustion-supporting gas participates in the combustion of reduced oil or other fuels, therefore, heat quantity took away by flue gas is greatly reduced and the heat generated by the fuel is almost entirely used for the melting of copper, and thus, the fuel consumed by the melting of copper is greatly reduced and the metal melting time is shortened by 4-6 hours by using a full-oxygen combustion method; according to the invention the included angle of the injection pipe and the wall of the smelting furnace is designed to be 70-83 DEG, therefore, the fuel and the combustion-supporting gas infused into the smelting furnace can be dispersed uniformly and the fuel can be burned adequately.

Description

technical field [0001] The invention belongs to the technical field of nonferrous smelting, in particular to a method for smelting copper. Background technique [0002] In the process of copper smelting, the heating substances used in the past are fuel and combustion-supporting air, that is, in the combustion process, the combustion-supporting gas introduced is air, whose oxygen content is 21%, and the content of other gases such as nitrogen is 79%. Because 21% of the oxygen participates in the combustion, and the remaining 79% of the gas does not participate in the combustion, the amount of combustion-supporting air is large, and a large amount of nitrogen is discharged after absorbing heat in the furnace cavity. The heat accounts for more than 60% of the calorific value of the fuel, resulting in large heat loss during the copper melting process, high energy consumption, long melting time, and large copper loss. And because of the large amount of smoke exhaust and high tem...

AI Technical Summary

Problems solved by technology

Because 21% of the oxygen participates in the combustion, and the remaining 79% of the gas does not participate in the combustion, the amount of combustion-supporting air is large, and a large amount of nitrogen is discharged after absorbing heat in the furnace cavity. The heat accounts for more than 60% of the calorific value of the fuel, resulting in large heat loss during the copper melting process, high energy consumption, long melting time, and large copper loss

And due to the large amount of smoke exhaust and high temperature, it brings difficulties to the treatment of flue gas

Moreover, in the combustion zone, due to the presence of a large amount of nitrogen, nitrogen oxides will be generated during the combustion process, causing pollution to the environment.

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