A method for removing carbon from high-carbon copper-containing hot metal by injecting CO2

Abstract

A method of removing carbon in a high-carbon copper-containing molten iron by injection of carbon dioxide. The method comprises the following steps: (1) feeding the high-carbon copper-containing molten iron into an induction furnace; (2) injecting carbon dioxide gas into the high-carbon copper-containing molten iron, and stirring; (3) stopping injection when the mass percent of the carbon in the high-carbon copper-containing molten iron is less than or equal to 0.2%; and (4) post-processing carbon monoxide to generate carbon dioxide for recycling, and separating the copper-containing molten iron from molten slag. According to the method, the injected carbon dioxide reacts with carbon in a melt to generate carbon monoxide. After escaping, the carbon monoxide is combusted to regenerate carbon dioxide, and the carbon dioxide is recycled. The carbon dioxide is a weak-oxidation gas and cannot react with copper. The carbon dioxide also has dephosphorization function and desiliconization function.

Description

technical field [0001] The invention belongs to the field of metallurgy, in particular to a CO injection 2 A method for removing carbon from high-carbon copper-containing iron water. Background technique [0002] With the rapid development of copper smelting technology, the production of blister copper in my country has increased rapidly. At the same time, the stockpiling of copper slag has also increased greatly. As of 2015, the stockpiling of copper slag in my country has reached more than 270 million tons. The storage of such a large amount of waste not only occupies a large amount of land and pollutes the environment, but also contains a large amount of valuable metal elements in the copper slag, and the copper and iron content is higher than the grade of the ore. The waste of copper slag is also a waste of resources. [0003] At present, the utilization of copper slag is still focused on extracting copper and iron separately, and the recovery value is limited. The sim...

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Problems solved by technology

Patent application number 201010108198.7 proposes an electromagnetic induction furnace blowing CO 2 Clean steel smelting method for decarburization, using CO injection 2 The gas is decarburized, and the amount of decarburization is controlled by the furnace gas analysis system, but it does not involve the application of valuable metal elements, and there is no decarburization and copper preservation involved.

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