Abstract: In light of the problems in classified tailing-cemented filling by pipe gravity-flow, a series of process improvement methods are proposed, including multi-point feeding and vertical bar distribution. The engineering practice shows that the modified process can greatly reduce the segregation and non-uniform distribution of filling material, which can efficiently raise the integral strength of the fill roof, providing a strong technical support for large sectional area mining in high sulfur instable orebody.

Key words: Classified tailing, Cemented filling, Strength, Filling process