三山岛金矿新立矿区西南部矿体属海底开采，海底充填倍线达13，水平输送距离超过2000 m，属于高倍线强阻力输送充填料浆。为了解决充填料浆输送距离长、倍线高、输送阻力大等技术难题，进行了分级尾砂物化性能测试，充填骨料配比试验，管道输送阻力模拟等研究。研究结果表明，分级尾砂颗粒较粗，脱水性好，但是在输送过程中易沉降；添加细颗粒，能改善分级尾砂的流动性；推荐料浆配比为1：6~1：8，料浆输送质量分数为72%。通过充填料浆环管阻力输送试验和理论计算，得出料浆最大输送阻力为9MPa，除去自重水力压头，需加泵压6 MPa。工业应用结果表明，分级尾砂高倍线充填是可行的，为海底矿床安全开采提供了保障，实现了高倍线充填海底矿床。
The southwest orebody in Xinli district of Sanshandao gold mine is deep-sea metal deposit mining. The undersea backfilling is characterized by high filling times line and strong resistance to transport, because the filling line reaches up to 13 and the horizontal pipe is over 2000 m. The physical-chemical properties of classified tailings, proportion of slurry with classical tailings as aggregate, the resistance of pipeline transportation are studied to solve the technological problems of filling including long filling pipe, high filling timesline, and high resistance. The results indicate that classified tailings, which are good for dehydration as coarse particles and easily settle, are fit for backfilling after adding fine particles. The suggested dosage is 1:6 -1:8 (cement to classified tailings) with mass fraction 72%. By the round-pipe test and theoretic calculation, the maximal transport resistance may reach 9 MPa, so a pumping pressure of 6 MPa is required besides the hydraulic pressure. The application in mine shows the feasibility of the technology, which can provide safety for deep sea mining in the future as well as realize high filling times line filling in deep sea mining .
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