Application of Composite Gelling Agent in Filling Paste of Yunfeng Bauxite in Guizhou Province
In order to promote the resource utilization of industrial waste slag and reduce the carbon emission of filling mining,cement-slag-red mud composite gelling agent was used to modify the filling slurry of Yunfeng Bauxite Mine in Guizhou Province.Compressive strength,flexural strength,shrinkage rate,permeability,freeze-melt resistance durability tests and microstructure observation were carried out,and the influence rule and mechanism of cementing agents on backfill properties were analyzed.Combined with the field observation,the economic benefit of filling mining was evaluated.The results show that the compression strength,flexural strength,dry shrinkage,permeability resistance and freeze-thaw durability of the specimens modified by red mud and slag powder are significantly improved compared with the single cement paste specimens.When the mass ratio of cement,slag and red mud in the composite gelling agent is 2∶1∶1,the properties of the filling paste reach the best.The use of composite gelling agent can promote the hydration reaction and micro-aggregate reaction of the gelling material,and then improve the physical and mechanical properties of the filling paste.The application example of the self flow filling platform in Yunfeng Bauxite Mine shows that using cement-slag-red mud composite gelling agent to modify the filling paste improves the efficiency of solid waste resource utilization and can create significant economic benefits.
Filling pasteGelling agentSolid waste resourcesPhysical and mechanical property
万方数据
维普
