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Contaminated sites left over from metallurgical plants refer to the pollution of soil, groundwater and other environmental media caused by metallurgical production activities, mainly including heavy metals, organic matter, acidic substances and other pollutants. These pollutants have caused serious

Contaminated sites left over from metallurgical plants refer to the pollution of soil, groundwater and other environmental media caused by metallurgical production activities, mainly including heavy metals, organic matter, acidic substances and other pollutants. These pollutants have caused serious harm to human health and the ecological environment, and effective remediation measures are required for treatment.

Desen Washing Plant is a mobile leaching and sorting module that integrates material conveying, leaching and classification, and fine sand grading and screening. The processing output per hour can reach 10-15 cubic meters. This equipment is mainly suitable for projects such as soil leaching restoration, mine restoration and cleaning, tailings recovery, mining waste land pollution restoration and other projects with small processing volume and high requirements on project site space. The device has the following advantages:

The equipment has a wide range of applications and can be applied to multi-category leaching repair projects.

Modular design of equipment functions, flexible combination and configuration. According to the needs of the project, single-vehicle operation or multi-vehicle joint operation can be realized.

The design of the whole vehicle is novel, the appearance and size meet the requirements of road transportation, and the trailer is flexible and flexible, and it is not subject to geographical restrictions.

The modular design of the equipment, the pipe flanges between the modules can be operated, which greatly shortens the period of equipment entry and exit.

The equipment adopts DCS distributed electronic control system to realize decentralized control of equipment, centralized operation and monitoring, and hierarchical management. Data at all levels can be exchanged reliably through the bus without affecting each other. With 5G cloud IoT, the running status of the equipment is clear at a glance.

Application cases of Desen Washing Plant in the restoration and treatment of legacy contaminated sites in metallurgical plants:

Comprehensive treatment project for a legacy site of a smelting enterprise in Hunan: The total area of the site is about 20hm2, and the previous survey determined that the polluted area is about 21300m2, and the main pollutants are heavy metals such as lead, zinc, and cadmium. In-situ restoration of contaminated sites is carried out using the joint restoration technology of "solidification-stabilization + safety isolation + ecological closure". Among them, the "solidification-stabilization" technology uses Desen Washing Plant to carry out leaching and grading treatment of contaminated soil, and adds curing agents and stabilizers for curing and stabilization treatment. The "safe isolation" technology uses materials such as high-density polyethylene (HDPE) membranes and geotextiles to isolate and cover the solidified and stabilized soil. The "ecological closure" technology uses vegetation coverage and landscape construction to beautify and restore the ecology of the isolation layer. The project does not requisition new land, and the cost is reasonable. After restoration, it will be used as an ecological park, and the expected effect has been achieved.

Soil mobile leaching restoration project 2 in Beijing: The total area of the site is about 2.5hm2, and the previous survey determined that the polluted area is about 1.5hm2, and the main pollutants are heavy metals such as chromium, nickel, and copper. The Desen mobile washing plant is used to carry out leaching and grading treatment of contaminated soil, and add reducing agent and complexing agent for chemical reduction and complexation treatment. The treatment capacity of this project is about 3000t, and the treatment cycle is about 3 months. The treatment efficiency is high, and the treatment cost is low. The treated soil has reached the third-level standard of the national soil environmental quality.

The above are some cases of the application of Desen Washing Plant in the restoration and treatment of legacy contaminated sites in metallurgical plants. It can be seen that the Desen technical team has deeply participated in the standard repair of nearly a hundred domestic leaching repair projects. From process design, equipment series upgrade to equipment technical operation, it has accumulated rich case experience and continuously optimized the leaching repair process. It has laid a solid foundation for the intelligent and low-carbon development of equipment.