A continuous refining process of blister copper by fire method

Abstract

The invention provides a crude copper pyrogenic process continuous refining technology. The technology comprises the steps that crude copper is added into an adding oxidation area, and copper liquid is obtained through fusion; oxidizing gas is introduced into the copper liquid, impurity elements in the copper liquid are oxidized to generate oxidation refining slag, and the oxidation refining slagis discharged at regular intervals; the oxidized copper liquid flows into a reducing area; a reducing agent is added into the reducing area, the oxidized copper liquid is subjected to a reducing reaction; and the reduced copper liquid flows into a casting area, wherein the adding oxidation area, the reducing area and the casting area are isolated through isolation walls, communicate mutually in the bottoms and are located in a furnace body. The crude copper pyrogenic process continuous refining technology has the advantages of being low in energy consumption, environmentally friendly, high inautomation level, high in production efficiency and the like, crude copper continuous feeding and anode copper continuous casting can be achieved, oxidation and reducing processes are simultaneously carried in the operation process, operation time can be shortened, the equipment utilization rate is improved, the smog amount and smog ingredients are stable, and concentrated treatment and waste heatrecycling can be achieved.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal metallurgy, in particular to a continuous refining process of blister copper by fire method. Background technique [0002] The pyrometallurgical process of copper generally includes three steps: copper concentrate smelting, copper matte blowing and blister copper refining. The blister copper produced by copper matte converting generally contains 98.5-99.5% copper, and the remaining impurity elements include sulfur, oxygen, iron, arsenic, antimony, zinc, tin, lead, bismuth, nickel, cobalt, etc., and usually also contain selenium, tellurium , gold and silver and other rare metals and precious metals. Impurity elements will have adverse effects on the conductivity and mechanical properties of copper, while valuable elements such as scattered metals and precious metals need to be comprehensively recycled to improve resource utilization. On the one hand, the purpose of blister copper fire re...

AI Technical Summary

Problems solved by technology

Among them, the reverberatory furnace has a low degree of automation, manual intubation redox labor intensity, and more flue gas leakage lead to poor working environment, high energy consumption, and low production efficiency; the rotary refining furnace has a high level of automation, large processing capacity, and production The efficiency is high, but because of its deep melting pool, small heating area, and slow material conversion, it is not suitable for processing cold materials, and the converter control system is complicated; the tilting furnace combines the characteristics of the reverberatory furnace and the rotary refining furnace, but the shape of the furnace body Special, complex structure, high investment, and the furnace body tilts during operation, which has a great impact on the stability of the furnace roof and furnace wall

More importantly, these three widely used blister copper pyro-refining processes have a common disadvantage, that is, periodic operations. The refining process is divided into four cycles: feeding and melting period, oxidation and slag removal period, reduction period and casting period.

When periodic operation is adopted, the flue gas in the oxidation period contains SO 2 High concentration needs to be treated separately, high concentration of CO in the flue gas during the reduction period requires secondary combustion, fluctuating fluctuating flue gas volume in the four cycles makes centralized treatment impossible, and the follow-up flue gas treatment system is complicated, and the heat taken away by the flue gas cannot be recovered

At the same time, periodic operations lead to long operation time per furnace, large fuel consumption, low utilization rate of casting equipment, and affect production efficiency

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