Method for deeply removing arsenic, lead, zinc and tin through pyrogenic refining of crude copper

Abstract

The invention discloses a method for deeply removing arsenic, lead, zinc and tin by pyrogenic refining of crude copper. The method comprises the following steps of (1) adding scrap lead materials intothe crude copper, and performing heating to completely melt the materials; (2) blowing a deslagging agent and an oxidizing agent into a crude copper melt, completing oxidizing slagging and impurity removal, and performing deslagging; and (3) blowing a reducing agent into copper liquid treated in the step (2), carrying out reduction deoxidation operation, then carrying out deslagging, and castingthe copper liquid into an anode plate. The method is wide in raw material adaptability, easy to operate, low in cost, easy to be compatible with an existing process, good in removal effect on the arsenic, the lead, the zinc and the tin, and good in industrial application prospect and value.

Description

technical field [0001] The invention belongs to the technical field of pyrometallurgy and resource recycling of nonferrous metals, and relates to a method for deep removal of arsenic, lead, zinc and tin by pyro-refining of blister copper. Background technique [0002] Pyrochemical copper smelting generally includes matte smelting, matte blowing and anode refining to produce anode plates for electrolytic refining. Blister copper pyro-refining is a necessary early stage of the normal electrolysis process, and it has the functions of removing impurities, regulating the quality of anode copper, and treating anode anode and scrap copper. The ability of the copper electrolysis system to deal with impurities is limited by equipment and processes, and it is difficult to deal with anode copper with high impurity content. At the same time, there are strict requirements on the types of impurities. Therefore, impurities must be removed efficiently during the crude copper refining stage....

AI Technical Summary

Problems solved by technology

[0003] CN109971974A and CN109971975A make the blister copper refining process oxidize Fe by changing the feeding operation mode, by feeding in batches and oxidizing in batches 3 o 4 The problem of solid solution precipitation is effectively prevented, and Cu 2 O-FeO-SiO 2 The slag reduces the content of Pb and Bi impurities in anode copper, but the above refining method has limited removal depth of As and Sn impurities.

CN103243223A discloses a method for removing tin from blister copper, which is divided into preliminary oxidation and decontamination of fayalite slag, NaOH-NaNO 3 / KNO 3 Low temperature detinning, NaOH-NaNO 3 / KNO 3 Four steps of high temperature detinning and low temperature reduction operation, the process is long and the cost is high

CN209522889U discloses a tin removal device for blister copper production. Through equipment optimization, the efficiency of removing tin in blister copper with hydrochloric acid has been improved, but wet decontamination makes the original process more complicated

[0004] With the decline in the quality of copper concentrate and the increase in the proportion of recycled copper smelting raw materials, the types of impurity elements in blister copper are increasing and the impurity content is increasing. The removal capacity is limited, and the general impurity removal rate is 20-40%, which is difficult to meet the needs of new electrolytic processes such as high current density, large plates and mechanized stripping for anode plates

At the same time, the traditional process has a long operating cycle and high energy consumption. The development of efficient impurity removal methods and new slag removal agents has important application value

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