With the acceleration of urbanization, the amount of urban waste generated is also increasing, and the impact on the urban environment is also becoming more and more significant. In order to solve the problem of garbage, many cities use Incineration to treat garbage. However, the slag produced by Incineration contains a large amount of heavy metals, which will have a serious impact on the environment and human health if not treated. Therefore, the recovery of heavy metals from Incineration slag has become an important environmental protection issue.
Heavy metals in Incineration slag mainly include copper, lead, zinc, nickel, chromium, etc. These heavy metals have a great impact on the environment and human health. If the Incineration slag is directly dumped into the environment, these heavy metals will gradually penetrate into the soil and water sources, causing environmental pollution. If people eat these heavy metal contaminated foods by mistake, it will have a serious impact on their health and even lead to diseases such as cancer.
In order to solve this problem, the recovery of heavy metals from Incineration slag has become a hot topic. Next, we will introduce the specific operation steps of recovering heavy metals from Incineration slag.
1、 Slag treatment
The first step of recovering heavy metals from Incineration slag is to treat the slag. The purpose of slag treatment is to separate heavy metals from the slag for subsequent treatment. The commonly used slag treatment methods include water washing, oxidation, reduction, etc.
2、 Heavy metal separation
After slag treatment, the heavy metals in the slag are separated. There are many methods for separating heavy metals, and the commonly used methods include ion exchange, solvent extraction, membrane separation, etc. These methods can effectively separate heavy metals from the slag, providing a foundation for subsequent treatment.
3、 Heavy metal recovery
After the separation of heavy metals, heavy metal recovery can be carried out. There are many methods for heavy metal recovery, and the commonly used methods include electrolysis, chemical precipitation, adsorption, etc. These methods can recover the separated heavy metals and effectively utilize them.
4、 Wastewater treatment
During the process of heavy metal recovery, a certain amount of wastewater will be generated. These wastewater contain a large amount of heavy metals, and if directly discharged into the environment, it will cause serious pollution to the environment. Therefore, wastewater treatment is also an important link in the process of recovering heavy metals from Incineration slag. Common wastewater treatment methods include chemical precipitation, ion exchange, membrane separation, etc.
5、 Heavy metal utilization
After the above steps, the heavy metals in the Incineration slag are recycled. These heavy metals can be used for manufacturing electronic products, aerospace materials, building materials, etc. By recycling heavy metals, not only can resource waste be reduced, but environmental pollution can also be reduced.
In a word, heavy metal recovery from Incineration slag is a very important environmental issue. By treating the slag, separating heavy metals, recovering heavy metals, and treating wastewater, the heavy metals in the slag can be separated and recycled, thereby reducing resource waste and environmental pollution. At the same time, this is also a very promising industry that can contribute to socio-economic development.