Research And Application On Key Technology For Downhole Coal Flow Jig Separation

At present, the gangues which are used in the gangue backfill mining are comingfrom the washing and excavation in underground coal mines. The coal material minedfrom the working face is lifted up to the surface and transported to the coal dressingcompanies to conduct the upgrading process. In that period, the washed gangues aretransported to the underground gobs again to be regarded the backfill material in thebackfill mining technology. However, this makes the gangues be transported betweenthe surface and underground level, increasing the gangue transportation fee. In thesame time, the washing on the surface also results in many types of environmentproblems. Therefore, the researchers in China study the gangue separation costgradually. But the underground gangue separation must address some problemsincluding the process of coal mud water, the gangue separation system technology, therelevant equipment and the installation space. In this thesis, the author analyzed themain problems studying the solving methods. Through the methodology includingtheoretical analysis, three dimensional modeling, dynamic simulation and numericalsimulation, the gangue separation system arrangement, the technique of solving thecoal mud water underground were researched. The virtual technique of ADAMS isadopted do the dynamic simulation analysis, confirming the quick return feature of theunderground bundle jig. Beyond that, the numerical simulation is used to study thedeformation controlling technology within large area of roadways. The followingresults are gained:(1) The gangue separation system is determined for specific mines. Also, thetechnique regarding processing the coal mud water is designed. Beyond that, with thecombination of processing coal-mud-water, the optimization design of coal-gangueseparation is given.(2) Aiming at the specific conditions in underground mines, the jigger ismodified. The jigger separation machine is designed for the underground coal andgangues. Also, the mechanism of underground buddle jig is optimized and thedesigning parameters are analyzed. In the same time, the3D model and mechanicalanalysis are given regarding the underground buddle jig, confirming its mechanicalcharacteristics.(3) The deformation controlling method of large area chamber with a width of6.2m and height of9.27m is studied. The construction sequence of the undergroundlarge area chamber is studied with numerical simulation, finding that the descending construction is better for controlling the surrounding rock from deforming comparedwith the ascending technique. Also, the rock bolting net plus lining with acombination of union support are proposed, providing the reliable installing space forthe separation system. This makes the coal and gangues separation be realized,providing the technique support for large area roadway support and construction.