During underground mining operations, mine water carries extremely high concentrations of rock fragments and coal dust particles. The water composition is complex and fluctuates dramatically with seasonal changes. Traditional, extensive sedimentation processes are simply inadequate for deep purification needs. Accelerated wear on pipe walls, frequent clogging of core membrane modules, and repeated exceedances of end-user water quality standards have long plagued major mining areas in Northwest China. Our company, DIEN, offers specialized water purification equipment for mining areas. As a direct supplier of reverse osmosis (RO) equipment, we offer complete water purification systems at low wholesale prices. DIEN Water Treatment in Xi'an has been deeply rooted in the mining water sector for over a decade, customizing specialized RO reverse osmosis purification units for different mineral types and water inflow characteristics. Using a cascade interception concept, we connect pretreatment and the RO core unit, transforming mine wastewater from source to end-user into compliant reclaimed water in one step. This equipment is widely applicable to various surface and underground water usage scenarios, including coal mine faces, metal ore processing plants, and non-metallic mineral processing areas.
RO Reverse Osmosis Equipment
The corrosive effects of micron-sized rock powder and charged coal dust in mine water on water purification devices are devastating. Conventional RO units on the market often skip pre-filter protection and directly feed water, leading to a vicious cycle of membrane scaling and clogging, a precipitous drop in water output, and repeated disassembly, cleaning, and shutdowns within two months of operation. To address this, the DIEN R&D team has created a unique five-stage purification path: first, a high-flow self-draining filter traps coarse sand, gravel, and coal slag; then, a double-layer thickened quartz sand bed deeply captures suspended particles; next, a manganese sand layer specifically oxidizes and removes dissolved iron and manganese; finally, a precision security filter provides a final interception, ultimately reducing turbidity to below 1 NTU before feeding it into the reverse osmosis core. This combined approach fundamentally builds an indestructible protective barrier for the membrane elements, extending the membrane replacement cycle by two to three times compared to the industry average. The entire unit adopts a skid-mounted integrated design, occupying minimal space and requiring no major construction work. Even temporary pumping stations beside mine tunnels can be quickly installed. It features a built-in fully automatic reverse flushing logic, allowing a single unit to support continuous water production around the clock, significantly reducing on-site inspection manpower.
Yulin Open-Pit Mine Real-World Verification
In a ten-million-ton-per-year open-pit coalfield in Yulin, Shaanxi Province, the turbidity of mine water surged past 120 NTU during the rainy season, carrying shale fragments and high-valence iron and manganese ions. The mine's previous simple treatment line was forced to shut down two or three times a week for sludge removal, resulting in alarming scale buildup on the cooling tower walls and frequent failures of flotation reagents due to water quality fluctuations. After introducing the DIEN team, engineers conducted on-site sampling and surveys, custom-designing a 15-ton-per-hour integrated RO reverse osmosis water purification unit—featuring an automatic inclined tube sedimentation tank with multi-media anti-clogging filter tanks at the front end and a dedicated anti-fouling membrane module at the rear. Since its commissioning, the three core indicators of the produced water—hardness, suspended solids concentration, and iron and manganese content—have all remained within acceptable limits. It has operated continuously without failure for over two years, requiring only routine maintenance every six months, and downtime has been reduced by more than 85%. The purified water is diverted for cooling mining equipment, watering and dust suppression on site roads, and use in employee dormitories. The overall water recycling rate in the mining area has significantly increased, resulting in a sharp reduction in annual water costs.
RO Reverse Osmosis Equipment
As a local Xi'an manufacturer, DIEN Reverse Osmosis Equipment offers a full range of specifications, supporting customization based on actual operating conditions. Their mining-specific water purification units support adjustments to tonnage, upgrades to corrosion resistance, and the addition of low-temperature heating systems. For high-mineralization or highly acidic water inflows, ion softening and pH adjustment modules can be added. Every RO reverse osmosis unit undergoes rigorous pressure and water quality testing before leaving the factory. The entire unit comes with a warranty. Repair requests within Shaanxi Province will be responded to within 24 hours. Sufficient stock of filter media, consumables, and membrane elements is maintained year-round.
If your mine is struggling with wastewater resource recovery, siltation, or fluctuating water quality, please contact Xi'an DIEN Water Treatment directly. We will provide free on-site sampling and testing, and offer you a customized integrated water purification solution and detailed quote.
