Copper matte desulfurization and deoxidation gas switching control method

Abstract

A copper matte desulfurization and deoxidation gas switching control method comprises the following control steps that (1) when it is detected that the sulfur content in a melt in a fire refining furnace is more than 0.3%, oxygen-enriched gas is sprayed into the fire refining furnace through a bottom blowing spray gun, wherein the volume content of O2 in the oxygen-enriched gas is 20.5-60%; (2) when it is detected that the sulfur content in the melt in the fire refining furnace is less than 0.3%, reducing gas is gradually sprayed into the fire refining furnace through the bottom blowing spraygun, wherein when the reducing gas is natural gas, the volume ratio of the O2 in the oxygen-containing gas sprayed by the bottom blowing spray gun to the reducing gas is 2.8-3.2; and (3) when it is detected that the oxygen content in the melt in the fire refining furnace is greater than or equal to 0.6%, the bottom blowing spray gun starts to spray more reducing gas into the fire refining furnace,and when the reducing gas is the natural gas, the volume ratio of the O2 in the oxygen-containing gas sprayed by the bottom blowing spray gun to the reducing gas is 1.1-1.3. With the method, anode copper is directly produced, the process is simplified, the cost is reduced, and the grade of the produced anode copper is high.

Description

technical field [0001] The invention relates to a copper smelting method, in particular to a copper matte desulfurization and deoxygenation gas switching control method. Background technique [0002] In the blowing process, the matte is first oxidized to white matte, and then the copper-making reaction is carried out to produce blister copper. Finally, the anode copper is further oxidized and reduced in the refining process. There is a heat loss due to the intermediate material being transported, and a large manpower loss , long operating time and smelting cycle. [0003] The four-step operations of slagging, copper making, oxidation and reduction that need to be completed in the existing blowing process and refining process are realized through the switching of different gas components in the same device, and the automatic gas supply system for the pyrofinishing furnace has been developed. Through precise Regulate the switching of the four gases of oxygen, air, reducing ga...

AI Technical Summary

Problems solved by technology

[0002] In the blowing process, the matte is first oxidized to white matte, and then the copper-making reaction is carried out to produce blister copper. Finally, the anode copper is further oxidized and reduced in the refining process. There is a heat loss due to the intermediate material being transported, and a large manpower loss , long operation time and smelting cycle