| Gold hole of gold ore deposit to clear big faults on the east side,and in the north back to double back inclined structure,ore-bearing rock broken,the structure is loose,and is a very solid rock,mining technology is difficult,with the actual mining on the layered approach used in the dry filling method of ore body adaptability is poorer,the production problems such as low efficiency,severe resource loss;In addition,the high flow pit tailings reservoir of the mine has been in operation for many years,and the service life is only four years,so it will face the difficult problem of tailings disposal.In order to solve the above problems effectively,the method of constructing paste filling technology is put forward.And paste filling technology can realize the safe and efficient operation,in addition to depends on the mining process and packing process,the adaptation degree between the more mainly depends on the selection of filling materials,the preparation of paste and pipeline whether meet the requirements in three stages,among them,the security and stability of the filling pulp conveying is the key to realize filling process efficiently.Therefore,this paper focuses on the paste filling technology and slurry pipe transport parameters optimization of Jindong gold mine.Based on the analysis of the mining technical conditions of the mine,three mining methods suitable for different types of veins are compared and selected respectively.In addition,the physical and chemical properties of filling materials,the law of full tailings concentration and settlement,the strength characteristics of filling body,the optimization of slurry pipeline transport parameters,and the design of filling process are studied in combination of theory and practice.The main research contents and conclusions are as follows:(1)Through the analysis of the mining technical conditions of the mine,the veins of the three mining areas are respectively in line with the type of slow thin vein,dip thin vein type,acute thin vein type;Several mining methods suitable for the three types of veins are put forward and compared,and it is concluded that the two-step slicing and subsequent filling mining method is adopted for the slow and thin veins,the upward slicing and filling mining method is adopted for the inclined and thin veins,and the continuous downward drift filling mining method is adopted for the acute and thin veins.(2)Laboratory test study on filling materials.Through the analysis of the physical and chemical properties of the filling material,the filling material is determined.According to the experimental results of flocculation and sedimentation of tailings,FL4540 was selected as the flocculation and sedimentation polymerization agent of tailings slurry,and the dosage was 50g/t.SNF625 S was used as flocculant,and the dosage was 30g/t.The optimal dilution concentration of pulp is 8%～10%.The recommended feeding speed of thickener is about0.28t/m2·h～0.57t/m2·h.By packing material proportioning test,made the paste glue powder as cementing material,identified the mine a backing,two layered with glue filling sand ratio is1:6,the concentration of 62% matching parameters,the rest of the layered step and two step road filling 1:8,concentration of the paste respectively 58% and 60% than 1:15,concentration of colloidal matching parameters.By testing the rheological parameters of slurry,the yield stress and plastic viscosity of slurry with different concentrations were obtained under the condition that the cement-sand ratio was 1:6.(3)according to the idea of orthogonal test design and USES the FLUENT software for each scheme are numerically simulated,analyzed the filling times line and bend radius of curvature,pipe diameter,inlet velocity and the concentration of the five parameters in the process of slurry in pipeline frictional resistance loss,the largest pipeline wall shear stress and the influence of the maximum velocity of the bend,The order of the influence degree of each parameter on the resistance loss along the pipeline is obtained as follows: concentration >Pipe diameter & GT;Inlet flow rate >Filling fold line & GT;Curvature radius of elbow;The order of the influence of each parameter on the maximum wall shear stress of pipeline is as follows: concentration >Inlet flow rate >Filling fold line & GT;Curvature radius of elbow >Pipe diameter;For the maximum flow velocity at the elbow,the inlet flow velocity of slurry has the greatest influence on the maximum flow velocity at the elbow,while other parameters have no obvious difference.Taking the resistance loss along the path,the maximum wall shear stress of the pipeline and the maximum flow rate at the bend as the judging factors,the parameter combination of the optimal scheme is obtained through comprehensive analysis:The filling doubling line is 2,the curvature radius of the elbow is 1m,the inner diameter of the pipe is 150 mm,the flow rate of the slurry is 2.0m/s,and the slurry concentration is 58%.In this scheme,the resistance loss in the whole process is less than the gravitational potential energy of the slurry,and the self-flow transportation can be realized.The dynamic pressure and flow rate of the slurry in the process of moving in the pipeline are the same.In the straight pipe section,the high dynamic pressure and flow velocity are concentrated in the center of the pipe,and the high dynamic pressure and flow velocity in this area are known as the "flow core area".When the slurry is closer to the pipe wall,the "boundary effect" will appear,and the dynamic pressure and flow velocity values decrease rapidly and approach zero.(4)According to the research results of the laboratory test of filling materials and the optimization of slurry pipeline transport parameters,the process of the paste filling system of the whole tailings in Jangjindong gold mine is designed,and through the field investigation of the operation of the key equipment of the system,it is concluded that the technical indexes are basically up to standard. |
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