CNOOC Hubei Dayukou Chemical Co., Ltd.
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Project Name: CNOOC–Hubei Dayukou
Construction period: 2024
Filling capacity: 130 m³/h (daily processing capacity: 3,000 t)
Case description: Using the dihydrate phosphogypsum cemented backfilling process, the maximum required transport distance can reach 5.3 km.
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Introduction/Results
The nation’s first project to implement a dihydrate phosphogypsum‑based cemented backfilling process for mine ecological restoration and research; located in Zhongxiang, Hubei Province, it features a complete set of backfilling equipment. The annual backfilling capacity is 1 million cubic meters, with slurry mass concentrations ranging approximately from 57% to 62%. Slurry slump meets or exceeds 26 cm, mixing and slurry‑making capacity is ≥130 m³/h, the backfill pump delivers a maximum actual flow rate of 130 m³/h, with a maximum outlet pressure of ≥13.0 MPa, and the required maximum transport distance is up to 5.3 km.
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