Abstract: A method of stowing a goaf of potash salt ore comprising making wall slurry into barricades each have the same area as the sectional area of a tunnel and a thickness of 0.5 to 5 meters inside the underground tunnels in goaf of potash salt ore, with the interval between adjacent barricades being 5 to 100 meters, then stowing the interval between the barricades by using the filling slurry is described. The stowing method uses the wall slurry of high strength that is solidified with a gelling agent as the main bearing material, and uses the solidified filling slurry with a low strength as the main filling material, which has a good effect when compared with conventional filling materials. Moreover, the stowing method effectively utilizes the tail liquids, thereby reducing the addition of other additives, decreasing the cost, avoiding the discharge of liquid waste and relieving the environmental pressure.

Abstract: The present invention relates to a stowing method for a goaf of potash salt ore comprising making wall slurry into barricades each have the same area as the sectional area of a tunnel and a thickness of 0.5 to 5 meters inside the underground tunnels in the goaf of potash salt ore, with the interval between adjacent barricades being 5 to 100 meters, then stowing the interval between said barricades by using the filling slurry. The stowing method of the present invention uses the wall slurry of high strength that is solidified with a gelling agent as the main bearing material, and uses the solidified filling slurry with a low strength as the main filling material, which has a good effect when compared with conventional filling materials in that, the amount of additives that are used is smaller, the solidification time is short, the stowing strength is more adjustable, and the stowing cost is lower.

Abstract: Systems and methods for making sliders having larger roll off shapes and smaller pole tip recessions on the overcoat areas of air bearing surfaces (ABS) are provided. In certain example embodiments, at least one row bar may be positioned on a lapping machine's mounting fixture. Each row bar may include at least one slider, and each slider may include a side having a thin-film element formed thereon. A dummy bar may be positioned on the mounting fixture such that the dummy bar is lapped before any of the row bars. Then, the mounting fixture may be used to bring the surface of each row bar into contact with the lapping table's lapping surface. The row bar may be rotationally lapped such that for each row bar, the side having the thin-film element is lapped first. Thus, sliders having small pole tip recessions and larger roll off shapes may be produced.