In the limestone quarries of Lanao del Norte Province, Philippines, dust generated from mining operations was once a prominent conflict between ecological protection and production efficiency. PM2.5 and PM10 particles produced during limestone crushing, transportation, and stockpiling not only affected the surrounding ecological environment but also posed a threat to the health of workers. Today, as a high-efficiency dust control equipment, fog systems have become the core support for the green transformation of quarries with their full-scenario adaptability, building a dust reduction system featuring “source suppression + process control + full-area coverage”.
The core advantage of fog systems lies in precise targeted dust reduction, which perfectly meets the needs of various operational links in quarries. After blasting operations, long-range fog systems can be quickly activated. The adjustable fog particles (30-150μm) form a high-density fog curtain, instantly capturing a large amount of dust generated by blasting and preventing dust from spreading to surrounding areas, with a dust reduction efficiency of over 90%. For the crushing and screening process – a key dust-prone area – fixed fog systems work in synergy with enclosed workshops. They form a circular fog screen at the material inlets and outlets, firmly confining dust within the operation area. When combined with a negative pressure dust collection system, the particulate matter emissions at the factory boundary meet environmental protection standards.
The control of secondary dust during transportation also cannot do without the assistance of fog systems. Intelligent fog systems installed along the roads in quarries can monitor air quality in real-time through dust sensors. When the PM10 concentration exceeds the standard, they automatically start spraying. With 360° rotation, they cover the entire road section, moistening the road surface while capturing dust generated by vehicle movement. Compared with traditional sprinklers, fog systems save more than 60% water. Moreover, the fine fog particles do not affect vehicle traffic, achieving a win-win situation for environmental protection and efficiency. In the finished product stockpiling area, fog systems spray regularly to maintain moisture. Combined with roof enclosures, they form a three-dimensional protection, effectively suppressing wind-induced dust, maintaining stable material moisture content, and ensuring storage safety.
By scientifically deploying fog system solutions, the quarries in Lanao del Norte have not only solved the problem of dust pollution but also achieved multiple benefits. The dust concentration in the operation area has dropped from hundreds of mg/m³ to below the national standard limit, protecting the respiratory health of workers; the surrounding vegetation coverage has recovered well, and the risk of ecological damage has been significantly reduced. Intelligent fog systems support remote control and automatic adjustment, which can dynamically adjust the operation mode according to dust concentration and humidity, greatly reducing manual intervention and lowering operation and maintenance costs.
As a powerful tool for the green transformation of the limestone mining industry, fog systems, with their high-efficiency, energy-saving, and flexible dust reduction capabilities, provide a practical solution for the limestone quarries in Lanao del Norte to realize the “coexistence of ecological protection and economic development”. In the future, with the in-depth integration of intelligent monitoring and fog system technology, it will further promote the upgrading of dust control in quarries towards “precision, intelligence, and full-area coverage”, safeguarding the green mountains and clear waters of Mindanao.
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