Method for making blister copper from highly magnetic copper oxide slag in one step and kiln for making blister copper

Abstract

The invention discloses a method for preparing crude copper by one step from high magnetic copper oxide slag and a kiln for preparing the crude copper. The method comprises the following steps: molten high magnetic copper oxide slag is discharged into the kiln capable of horizontally rotating for reduction smelting; a fluxing agent is added to adjust a Fe / SiO2 ratio of the high magnetic copper oxide slag as 1.5-1.8; nitrogen is fed to stir the high magnetic copper oxide slag in the reduction smelting process; after mattes being 15-20 weight% of the high magnetic copper oxide slag or copper concentrates being 30-45 weight% of the high magnetic copper oxide slag are fed for smelting reduction, melts in the kiln are removed slag after clarification and separation; then, a wind port is switched to introduce compressed oxygen-enriched air; the kiln rotates for converting the melts in the kiln to oxidize the mattes in the kiln to obtain the crude copper; then, the melts are removed the slag again after settling separation; and finally, the crude copper is discharged. The method can reduce the copper content and the magnetic iron content in the high magnetic copper oxide slag, improves the fluidity of the oxide slag, is convenient for settling separation of copper in the oxide slag, improves the direct yield of smelted copper, reduces the energy consumption in the smelting process, and enhances the yield.

Description

technical field [0001] The method belongs to non-ferrous metallurgy process and equipment technology, and is a method for producing blister copper from high magnetic copper oxide slag in one step and a kiln for producing blister copper. Background technique [0002] At present, the highly magnetic copper oxide slag produced by top blowing furnaces, bottom blowing furnaces or flash converting furnaces has high copper content and high magnetic iron content in slag. The furnace itself does not have the ability to reduce slag or settle and separate, resulting in slag containing copper. A large amount of slag containing copper circulates in the smelting process, which leads to problems such as high energy consumption of copper smelting. Copper matte oxygen-enriched blowing is an intensive smelting process. The copper in the material is strengthened into cuprous oxide, and cuprous oxide has a high solubility in iron slag, and it is easy to form high magnetic copper oxide slag with...

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Problems solved by technology

The main treatment methods in the industry are: beneficiation method after slow cooling of slag, reduction sulfuration and dilution method in subsidence electric furnace, remelting ingredients after water quenching, etc. The disadvantages of these methods are low recovery rate of beneficiation, large copper loss, and low reduction efficiency of electric furnace , The bottom of the furnace is easy to form a frozen layer, high energy consumption, water quenching and remelting bring about increased energy consumption, and a large amount of copper circulation in the system

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