The method of roadway-by-roadway backfilling mining to protect roof and replace pillar for bauxite under coal seam
China's bauxite reserves under coal seam are extremely rich,accounting for more than 50％of the national bauxite reserves.With the gradual depletion of shallow surface bauxite resources in China,underground bauxite,especially bauxite under coal seam,will become the development trend and inevitable choice of bauxite development.In view of the mutual influence of strata movement in the process of coal and bauxite co-mining at present,it was put forward that the method of roadway-by-roadway backfilling mining to protect roof and replace pillar for bauxite under coal seam.Each bauxite pillar was divided into several mining roadways,and each mining roadway was backfilled immediately after mining to achieve timely roof protection and control strata movement.Each mining roadway was mined and backfilled successively according to the design sequence to realize the replacement mining of bauxite pillar and backfill body,and finally ensured the normal mining of bauxite and the upper coal seam.This method has been successfully applied to Aojiawan Bauxite Mine of Shanxi Huaxing Alumi-num Co Ltd.The backfill body was in close contact with the roof,and the displacement of roof and floor after backfilling was controlled within 20 mm.This method can effectively control the strata movement after mining of bauxite,ensure the continuity of overlying coal seam,and realize the protective mining of bauxite against overlying coal seam.After backfilling,the roof can be protected in time,and the overall stability of stope can be improved,which can solve the technical problem of weak direct roof control of bauxite.The bauxite recovery rate was increased from 45％to 78％,and the ore A/S dilution rate was controlled at 5.06％.The backfilling equipment was installed in the underground,and occupied a small space,which has the advantages of miniaturize,portable and low cost.The overall technical and economic benefits are significant.A complete technical system of roadway-by-roadway backfilling mining to protect roof and replace pillar adapted to the site has been formed,which is technically feasible and economical.It can provide technical support for the realization of co-mining of coal seam and bauxite,and has a great popularization and application prospect.
coal measuresbauxite under coal seamroadway-by-roadway backfilling miningpillar recoverycoal seam and bauxite miningcoordinated mining
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