Abstract: In order to optimize the tailings filling technology and economic indicators for an iron mine, tests have been carried out about slurry concentration, cement-sand ratio and new gelling materials. The results showed that ① cement is the main factor affecting the strength of the filling test block. Increasing slurry concentration is beneficial to enhance the strength of the test block. The strength of the test block increased rapidly at the age of 7~28 d, reaching twice of the original. The strength of the test block generally increases at the age of 28~90 d, especially when the cement content is more. ② The yield stress of the slurry is positively related to the slurry concentration after eliminating the factors such as settlement and agglomeration. The slurry mass concentration for non cemented filling should be 74%~72%, and that for cemented filling should be 73%~71%. ③ The addition of cementation powder is conducive to improving the strength of the filling body test block. Therefore, the mine should carry out research and demonstration on the replacement or partial replacement of mining cement with new cementation materials.

Key words: filling mining, gelling materials, slurry concentration, cement-sand ratio