Refining method of crude copper

Abstract

The invention relates to the technical field of non-ferrous metal metallurgy, in particular to a refining method of crude copper. The refining method comprises the following steps: adding a slag former into a refining furnace; then adding a crude copper melt for slagging operation; and after deslagging, reducing crude copper to obtain refined copper, wherein the slag former is quartz sand. By adopting the technical scheme, continuously blown crude copper high in content of Fe, Pb and Bi is refined by using a rotary anode furnace. The slag former is added first and then the crude copper melt isadded. In an oxidization slagging process, oxidized Fe in the crude copper is combined with SiO2 in the slag former and an oxide of copper Cu2O to form a Cu2O-FeO-SiO2 series slag melt, so that a Fe3O4 solid solution can be prevented from being separated out and adhered to a furnace wall and a furnace bottom to form furnace accretion, and therefore, normal rotation of the volume of a hearth and the furnace body is kept; moreover, the distribution coefficient of impurities such as Pb and Bi in the crude copper in silicate slag is much higher than that in ferrate slag, so that the impurities such as Pb and Bi are enriched to the silicate slag to be discharged, and therefore, the content of the impurities such as Pb and Bi in anode copper is reduced effectively.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal smelting, in particular to a method for refining blister copper. Background technique [0002] The pyrometallic copper smelting process generally includes three processes: smelting, blowing and refining. When using the continuous blowing process to produce blister copper, there are a large amount of slag and blister copper in the molten pool. In order to maintain a low level of copper in the slag and obtain a higher copper direct yield in the blowing process, the produced copper must be kept The blister copper produced has a high sulfur content, and its sulfur content is nearly 10 times that of the blister copper produced by the PS converter; from the chemical balance of copper matte, it can be seen that the high sulfur content of blister copper will inevitably lead to the high Fe content of blister copper. In addition, in order to reduce the output of slag, the continuous blowing proces...

AI Technical Summary

Problems solved by technology

The existence and growth of furnace knots will increase the wall thickness of the anode furnace, reduce the volume of the anode furnace, reduce the single furnace output of anode copper, reduce the production capacity of the anode furnace, and increase the natural gas consumption for refining and casting of the anode furnace, and increase the efficiency of anode casting. The frequency of operation will cause a series of problems such as increased labor intensity and increased cold copper production. When the furnace knot is serious, the furnace body of the rotary anode furnace will be too heavy and cannot rotate normally.

In addition, a large amount of Fe 3 o 4 The existence of slag will increase the viscosity of the slag, making it difficult to discharge slag in the anode furnace, causing a large amount of copper to be discharged with the slag, increasing the difficulty of subsequent treatment and causing the consumption of natural gas for cold copper reprocessing

[0004] It is difficult to effectively remove Pb, Bi and other impurities by using the general refining method to refine blister copper containing Pb and high Bi in the anode furnace. Difficulties