Blister copper fire refining process

Abstract

The invention provides a blister copper fire refining process. The process comprises the following steps: continuously adding blister copper into an oxidation zone and melting to obtain copper liquid;introducing oxidizing gas into the copper liquid for oxidizing copper and enabling the oxidized copper liquid to flow into a reduction zone for carrying out reduction reaction; combusting combustiblegas generated in the reduction zone when flowing through the oxidation zone; enabling the reduced copper liquid to continuously flow out of a copper discharging opening and exhausting the generated flue gas along with flue gas of the oxidation zone from a flue gas outlet. By simultaneously carrying out oxidizing and reducing reaction in a continuous refining furnace, the quantity of the flue gasis small, operation time can be shortened, the utilization rate of equipment is improved, and the problems of serious pollution caused by great exhaust amount of SO2 flue gas and cladding of a cold material with blister copper are effectively solved. Meanwhile, the quantity and components of the flue gas are relatively stable; the combustible gas generated by the reduction zone can be combusted bythe oxidation zone before exhaust for secondary utilization, so that waste heat of reduced flue gas is effectively utilized; the blister copper fire refining process has the advantages of low energyconsumption, environment friendliness, small quantity of the flue gas, high production efficiency and the like.

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 and precious metals. Impurity elements will have adverse effects on the conductivity and mechanical properties of copper, while valuable elements such as rare metals and precious metals need to be comprehensively recycled to improve resource utilization. Copper fire refining refers to the fire method of removing impurit...

AI Technical Summary

Problems solved by technology

Due to the inherent limitation of the reverberatory furnace structure, whether it is manual feeding or mechanized feeding, the feeding speed is slow, the supplementary heat in the whole process and the low thermal efficiency of the reverberatory furnace all lead to high fuel costs for the anode plate

After the completion of the five stages of the traditional reverberatory furnace, the operation of the next furnace is continued, the productivity is low, and the production cost is high

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