Efficient environment-friendly recycling method of copper slag

Abstract

The invention discloses an efficient environment-friendly recycling method of copper slag. The method comprises the following steps that 1), after being dried, the copper slag is ground into powder, and copper slag powder is obtained through mesh filtering; 2), a sodium hydroxide solution is into the copper slag powder, the mixture is mixed uniformly and reacts in hot ball milling after mixing at the temperature of 153-210 DEG C for a preset time, the mixture is poured out and stands, and after solid-liquid separation, sodium silicate and filter residues are obtained; and 3), the filter residues in the step 2 are placed into a roasting machine, while the temperature rises up to the roasting temperature, industrial waste gas CO gas is added into the machine for the reduction reaction, the mixture is poured out after the preset time, and magnetic separation is utilized for obtaining iron and slag. According to the method, the sodium hydroxide solution is added into the copper slag to cooperate with hot ball milling, the structure of fayalite is accelerated to be damaged, sodium silicate can be generated through reaction with sodium hydroxide, silicon elements are recycled, and generation of flocculating gel silicon can be avoided.

Description

technical field [0001] The invention relates to a process for recycling copper slag, in particular to an efficient and environmentally friendly recycling method for copper slag. Background technique [0002] Copper slag is the slag produced in the process of copper smelting, mainly produced in the process of copper concentrate smelting, the typical composition of copper slag is 30% to 40% of Fe, 0.2% to 5% of Cu, and 35% of SiO2 % to 40%, the A12(h and Ca0 contents are all below 10%, and there are also a small amount of metal elements such as zinc, iron, and cobalt. It can be seen that the iron content in copper slag is very high. [0003] However, at present, the utilization rate of copper in copper slag in China is less than 12%, and the utilization rate of iron is even 1%. Most of the copper slag is piled up in the slag yard, which not only occupies land but also pollutes the environment, and is also a huge waste of resources. It has become an important factor hindering ...

AI Technical Summary

Problems solved by technology

[0003] However, at present, the utilization rate of copper in copper slag in China is less than 12%, and the utilization rate of iron is even 1%. Most of the copper slag is piled up in the slag yard, which not only occupies land but also pollutes the environment, and is also a huge waste of resources. Has become an important factor hindering the sustainable development of copper smelting enterprises

If all the iron in the copper slag can be recycled, it will not only solve the problem of environmental pollution caused by the accumulation of copper slag, but also provide a new raw material for the ironmaking industry, reduce the cost of ironmaking, and enable copper smelting enterprises to achieve sustainable development and the requirements of circular economy, but most of the existing copper slag recovery methods directly use concentrated sulfuric acid for multiple leaching to produce flocculating gel silica, and the recovery effect of valuable metals is not ideal, and most of the existing copper slag recovery methods only recover Valuable metals, ignoring silicon