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Case Study of Cast Stone Composite Pipe Used for Underground Backfilling at the Lingnan Gold Mine in Shandong Zhongkuang
Shandong Zhongkuang Group’s Lingnan Gold Mine has installed a 10,000-meter-long cast‑stone composite pipeline for underground backfilling, serving as the tailings transport line. The project was officially commissioned in 2017, with a daily processing capacity of 10,000 tons of raw ore. To date, it has been operating continuously and stably without any abnormalities, demonstrating excellent process compatibility and outstanding operational reliability. This project stands as a benchmark for high‑concentration, structured‑flow backfilling using full‑tailings in the Jiaodong region’s typical fine‑grained gold deposits. It employs cast‑stone composite pipes to enable gravity‑driven self‑flow transport, with a hydraulic gradient of 9.8‰, a maximum self‑flow ratio of 9.6, and an hourly backfilling rate of up to 180 m³, delivering stable and highly efficient transport performance.
The project transports full‑tailings slurry with a d₅₀ of 0.028 mm and a −200 mesh fraction of 82%. The gangue contains abundant flaky mica and hard quartz particles, while the filling slurry has a concentration of 69% and a neutral to slightly alkaline pH. These conditions impose severe operating challenges, combining fine‑particle shearing with particle‑induced erosion and exhibiting relatively high rheological resistance. Thanks to its outstanding wear and erosion‑resistance, the cast‑stone composite pipe is ideally suited to the complex downhole filling requirements of high‑concentration, high‑resistance slurries. Years of continuous operation have amply demonstrated that this composite pipe offers a robust structure, exceptional wear resistance, and virtually maintenance‑free performance, with exceptionally strong practicality and operational adaptability—providing a high‑quality, mature solution for high‑concentration tailings‑slurry conveyance in domestic gold‑mine underground filling applications.
Penglai Hua'an Cast Stone Pipe Fittings Co., Ltd.
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