| ABSTRACT:Because of using caving method in Shengda Iron Mine, the underground goaf was not made treatment, leading to surface subsidence and the Quaternary allurium and the ocean formation’s serious destruction and the underground gushing water increasing, the consequences will greatly affect the safety of mine personnel and equipment, and serious damage to the ecological environment. So in order to ensure the safety of the underground resources mining, the mine must use the backfilling for treating underground goaf. The key of backfilling was back-filling quality and efficiency, but backfilling quality and efficiency based on backfilling materials, technical parameters, reliability of system and advanced, this paper research the process of fines-cementation backfill based on the mining conditions and the filling materials in minig. Through field research, laboratory testing, theoretical analysis, process design, and other means, it has deeply study the filling materials, filling ratio, network parameters, the filling system process design, and analyzed the reliability of backfilling system. The main contents and conclusions of this paper are summarized as follows:1. With the other mining’s filling experience, it choose a kind of fines-cement material which is produced in Jiaojia mining as the cementitious materials. Based on the experimental result of comparing the fines-cement material with the ordinary portland cement, it find that the fines-cement material has the advantage of well cementation and high strength, which can provide a theoretical basis for application of fines-cement material as a cementitious material in cement backfilling.2. By analyzing the physical properties of tailings and testing the filling ratio, it get the best ratio. The cementation plane:ratio (coment: tailings)was1:4, the other place:ratio (coment:tailings)was1:8-1:10. And it recommend the lime as expanding material for roof-contacted filling. The append mass of lime is5%mass of fines-cement material, mass concentration=72%. It got the flow feature experimentation of the optimized proportion slurry, to determine slump and settlement, which show that the optimized proportion slurry with good performance of transmission, meet the requirements of pipeline transportation by gravity fully.3. The pipeline parameters of filling transportation were confirmed. Through theoretical calculations, it receive critical velocity, pipeline diameter and pipeline resistance. It proved that the transportation depending gravity was reliable by theoretical analysis. And pipe wall thickness was calculated by the total resistance of pipeline to determine the type of pipeline.4. This paper had designed the process for fines-cementation gravity transportation backfill System of Shengda Ming. It completed the design of major facilities program and equipment selection based on thefilling capability.A program of backfilling general layout plan of station and underground pipeline system was designed. The total investment of backfilling system was about9.3364million yuan. The backfilling costs that the slurry’s filling ratio was1:4were144.7yuan/m3or41.58yuan/t. The backfilling costs that the slurry’s filling ratio was1:8were94.5yuan/m3or27.15yuan/t.5. The fines-cement backfilling had been evaluated. It not only make the best of Mining’s rejected material to reduce the accumulation of tailings, but also is good for protecting surface construction and improving the recovery of mineral resources. It save the filling cost and meet the requirements of the filling. So it has good environmental benefit, economic benefits and social benefits. |
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