Method for removing carbon in high-carbon copper-containing molten iron through injection of carbon dioxide

Abstract

The invention provides a method for removing carbon in high-carbon copper-containing molten iron through injection of carbon dioxide and belongs to the field of metallurgy. The method comprises the following steps that firstly, the high-carbon copper-containing molten iron is guided into an induction furnace; secondly, carbon dioxide gas is injected into the high-carbon copper-containing molten iron, and stirring is conducted; thirdly, when the mass percent of the carbon in the high-carbon copper-containing molten iron is smaller than or equal to 0.2%, injection is stopped; and fourthly, carbon monoxide is post-processed to generate carbon dioxide, the carbon dioxide is recycled, and the copper-containing molten iron is separated from slag. According to the method, the injected carbon dioxide reacts with the carbon in the melt to generate carbon monoxide, after escaping, the carbon monoxide is combusted to regenerate the carbon dioxide, and the carbon dioxide returns to be used; and besides, the carbon dioxide is a weak-oxidation gas and cannot react with copper, and the carbon dioxide further has the dephosphorizing function and the desiliconization function. By the adoption of the method for removing the carbon in the high-carbon copper-containing molten iron through injection of the carbon dioxide, the technology is simple, a stirring system is additionally arranged in the induction furnace, energy is saved, environmental friendliness is achieved, the cost is low, the greenhouse gas is utilized, and therefore the high economic value and the good environmental protection function are achieved; and the purpose of removing the carbon is achieved, and the copper element in the high-carbon copper-containing molten iron can be protected against the burning loss.

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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