Method for fusing and reducing iron from copper residue by blowing inert gas

Abstract

The invention discloses a method for fusing and reducing iron from copper residue by blowing inert gas which comprises the steps of: transferring a high-temperature copper residue from a pouring packet to a high-temperature reduction furnace, adding reducing agent and slagging agent which are crushed into the reduction furnace, performing high-temperature iron reduction reaction, stirring inert gases and blowing into a furnace hearth during the reaction, spraying the inert gases and stirring the fused residue, performing high-temperature smoke secondary combustion, collecting dust and washing after recycling the waste heat, injecting into the atmosphere after emptying, and discharging high-temperature molten iron and slag from an iron outlet and a slag outlet after finishing the reaction. The invention takes full advantages of high-temperature waste heat of the discharged copper residue in order to save energy and reduce emission. The process flow is short; the discharge of contaminant is less, the recovering ratio is high; the applicability is wide; the process flow for recycling iron from copper residue is shortened; the operation in each process flow is simple; and the maintenance cost for furnace is lower.

Description

technical field [0001] The invention relates to a method for recovering iron from copper slag by directly using a reducing agent to reduce iron in copper slag by blowing and stirring inert gas in a molten state, and belongs to the field of resources and environment. Background technique [0002] In recent years, China's iron and steel industry has developed rapidly. According to the World Iron and Steel Association, the total output of crude steel in 67 major steel-producing countries and regions in the world was 1.3435 billion tons in 2007, a year-on-year increase of 7.5%. This is the fifth consecutive year of growth. The speed is above 7%. Among them, China's output was 489 million tons, a year-on-year increase of 15.7%, accounting for 36.397% of global steel production, and it is the world's largest crude steel producer. In 2008, due to the impact of the global financial crisis, the global steel output was 1,329.71 million tons, an increase of -1.02% over last year, of w...

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Problems solved by technology

[0007] 2. Iron is enriched in magnetite through oxidation roasting-crushing magnetic separation process. This process has the disadvantages of low iron recovery rate and complicated follow-up treatment process

Relevant documents confirm that the highest recovery rate of iron in copper slag is maintained at about 85% through this process, and the enriched iron is concentrated in magnetite, which needs to be put into the blast furnace for reduction and ironmaking For ironmaking, the whole process is too complicated

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