Abstract: The paper introduced that the gravity-flowed filling was successfully achieved under extra great times line conditions by three techniques of large diameter, small flow and low flow rate, according to the law of high concentration slurry pipeline transportation in Jianchaling Nickel Industry Co., Ltd. Then, the gravity-lowed cemented filling with high concentration slurry pipeline was realized with significant economic and technical benefits obtained. Lastly, the general applicability of this technique and its innovation were evaluated.

Key words: Filling times line, Large diameter, Small flow, High concentration, Low flow rate