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Behind China's continuous leadership in global coal production lies a silent environmental crisis. Over 500 million tons of coal gangue accumulate annually, like a persistent black "ailment." These "by-products" from coal mining and washing processes contain hidden heavy meta

Behind China's continuous leadership in global coal production lies a silent environmental crisis. Over 500 million tons of coal gangue accumulate annually, like a persistent black "ailment." These "by-products" from coal mining and washing processes contain hidden heavy metals, sulfides, and other pollutants. Not only do they consume precious land resources, but the pollution generated by their weathering and leaching, like an "invisible" hand, seriously threatens soil, water bodies, and the atmosphere. Facing this severe challenge, Desen Environment, with its profound soil remediation technology accumulation, has launched the coal gangue washing equipment, opening up a new path for pollution control and resource regeneration.

Four-Dimensional Technical Matrix: Building a Pollution Control "Safeguard Network"

Desen's independently developed coal gangue washing equipment takes physical separation and chemical extraction technologies as the core, creating a precise and efficient pollution control system. Its modular design is like a sophisticated "industrial jigsaw puzzle," with four core units working in tandem:

Crushing and Screening System: The hydraulic cone crusher and vibrating screening equipment form a "golden partnership." Acting like precise "ore tailors," they can finely control the particle size of coal gangue to below 5mm, laying a high-quality foundation for subsequent processing.

Enhanced Leaching Unit: Based on the principle of mass transfer kinetics, the multi-stage countercurrent cyclone leaching technology, combined with the independently developed chelating agent and surfactant compound system, forms a "heavy metal". With a super-strong turbulent intensity of 15 - 20m/s, the mass transfer efficiency of pollutants far exceeds that of traditional washing processes, enabling efficient desorption of heavy metals.

Solid-Liquid Separation System: The combination of a screw press sludge dewatering machine and a plate-and-frame filter press, through a gradient pressure dewatering process, significantly reduces the moisture content of the treated coal gangue, transforming "wet coal gangue" into "dry materials" that are easy to handle.

Wastewater Treatment Module: The combined process of "neutralization precipitation - advanced oxidation - membrane separation," like a professional "water quality purifier," targets and removes heavy metal ions, sulfides, and other pollutants. The treated water quality meets the first-level standard of the Integrated Wastewater Discharge Standard (GB8978 - 1996), and the water resource reuse rate is remarkable.

The industrial IoT intelligent control system installed on the equipment serves as the "intelligent brain" of the entire device. Through the PLC and DCS systems, it realizes full-process automated monitoring, and can adjust parameters such as crushing ratio, leaching agent ratio, and dewatering pressure in real-time according to the composition of coal gangue. Even in the face of complex and changing working conditions, it ensures the stability and reliability of the treatment effect.

Practical Applications Prove Effectiveness: Customized Solutions Solve Governance Challenges

In a large coal mine in North China with severe heavy metal pollution, traditional treatment methods repeatedly failed. The technical team of Desen Environment conducted in-depth on-site investigations in the mining area and "tailored" precise optimizations to the leaching process and reagent formulations of the washing equipment according to the characteristics of coal gangue. During the trial operation period, faced with the problem of unstable heavy metal removal efficiency, technicians worked day and night, adjusted the parameters of multi-stage countercurrent cyclone leaching and the addition ratio of chelating agents through repeated trials, and finally achieved a significant increase in the removal rates of heavy metals such as lead and cadmium. The treated coal gangue meets the relevant resource utilization standards and has been transformed into "new building materials" for road construction in the mining area, not only solving the pollution problem but also reducing the consumption of new sand and gravel materials, achieving a win-win situation of environmental and economic benefits.

Full-Cycle Services: Technology Empowers a Green Future

With continuous technological innovation, Desen's coal gangue washing equipment has won a number of national invention patents and utility model patents. The company's original three-level technology transfer system of "R&D - pilot test - engineering" can provide customized solutions for the characteristics of coal gangue in different mining areas. From pre-project pollution surveys and feasibility analyses, to equipment installation and commissioning, operator training, and full-life cycle operation and maintenance services, Desen Environment provides customers with worry-free and efficient one-stop environmental governance services in the "turnkey project" mode, safeguarding the green mountains and clear waters with technological strength.