In the past, dry screening was a common practice in the concrete wastewater treatment mining industry. However, as global markets advance, more efficient washing systems have emerged as the preferred method for producing silt-free materials. Mining companies that use washing and scrubbing systems can ensure higher-quality end products by effectively eliminating contaminants.

Why Mining Concrete Wastewater Treatment Companies Use Washing Systems

Mining companies employ washing systems to improve the quality of their target products by reducing and eliminating unwanted materials. Contaminants such as chemical or mineral impurities can degrade product quality, making washing an essential step in the refining process.

Washing systems also play a crucial role in accurately separating materials based on particle size. Unlike dry separation systems that rely on gravity or air currents, water-based washing screens provide more precise cut-points and higher efficiency at small apertures.

Dry Separation vs. Washing Systems

Dry Separation

Dry separation methods, such as standard sizing screens for coarse fractions or air classifiers for sand and fines, cannot match the efficiency and final product quality of modern washing systems. Factors such as latent moisture content, sticky or agglomerated materials, and the presence of low-mass contaminants can be better addressed through wet washing systems.

Common Contaminants Requiring Removal:

• Excess fines (<75μm / 200#) in concrete sand
• Excess sea minerals in marine-dredged sand
• Sulfates found in sand deposits
• Surface contaminants (e.g., FeO2 in high-quality silica sand)
• Clays adhering to aggregates or minerals
• Trash in recycled materials (e.g., plastic, paper, grass in construction debris)
• Oils and heavy metals in excavated soils or tar sands

Each of these contaminants requires a well-designed washing system to achieve optimal efficiency and quality.