Method for extracting iron-copper alloy from high-temperature molten copper slag

Abstract

The invention provides a method for extracting iron-copper alloy from high-temperature molten copper slag. According to the method, the high-temperature molten copper slag from a copper smelting furnace passes through a copper slag trough with a reduction function, then directly flows into a copper slag ladle with a reduction function and is subjected to reducing reaction, and crushing and magnetic separation are carried out after the slag ladle is cooled, thereby obtaining the iron-copper alloy. According to the method, external heat sources are not needed, and the latent heat of the molten copper slag is utilized sufficiently, so that valuable iron in the molten copper slag is subjected to reduction and collection in a low-cost manner. The method has the advantages of simple process, small investment, energy saving, environmental friendliness, low cost and high economic value.

Description

technical field [0001] The invention belongs to the field of resources and environment, and in particular relates to a method for extracting iron-copper alloy from high-temperature molten copper slag. Background technique [0002] In recent years, the output of electrolytic copper in China has grown rapidly. In 2011 alone, the national output of electrolytic copper reached 5.1 million tons; according to statistics, the production of one ton of copper produces 2.2 tons of copper slag, and the output of copper slag in 2011 reached 1,000 tons. tons. The copper slag contains about 40% iron, mainly fayalite (2FeO×SiO 2 ) and magnetic iron oxide (Fe 3 o 4 ) exists in the form of Therefore, if the iron in the copper slag can be extracted at a low cost, not only can the waste be reused, the industrial waste can be made harmless, but also significant economic benefits can be obtained. [0003] There are two main ways to deal with copper slag and recover iron in my country: [0...

AI Technical Summary

Problems solved by technology

[0005]This method has the following disadvantages: 1. Generally, the temperature of copper slag coming out of the furnace is about 1250°C, so this method needs to further heat the molten copper slag to a higher temperature (>1500°C), which requires a lot of energy

2. In order to further reduce the viscosity of slag and speed up the reaction speed, other additives need to be added to reduce the viscosity of slag; but this not only increases the cost of raw materials, but also these raw materials need to absorb heat and heat up, which also increases energy consumption

3. The copper slag is stirred at high speed at high temperature, which puts forward higher requirements on the high temperature corrosion resistance and mechanical properties of the stirring parts, coupled with the complex composition, so the selection of lining refractory materials in the high temperature reduction furnace is very strict, which Parts will also cost a lot

Compared with the first process, although this process can be carried out at a lower temperature (~1250°C), this method needs to cool the molten copper slag first, which causes a great waste of latent heat of molten copper slag, so Oxidation roasting-crushing magnetic separation process does not utilize the latent heat in the molten copper slag, which increases the cost

Images