Abstract: A control method for crushing massive furnace slag using a swingable type crushing apparatus in which a crushing clearance is increased or decreased in a stepwise manner by a hydraulic mechanism depending on crushing conditions of the massive furnace slag, which may be blast furnace slag, convertor slag, and electric furnace slag. A hydraulic pressure of a hydraulic mechanism is detected as a variable of the crushing conditions and is compared with a set value so as to adjust the crushing clearance.

Abstract: An operational control method for a cylindrical crusher in which furnace slag is supplied to the cylindrical crusher through supply means and said furnace slag is crushed to obtain a furnace slag product, wherein particle size distribution and iron content ratio of a furnace slag product are detected and variable control of a supplying amount from the supply means and/or revolution speed of a cylindrical crusher is carried out within a predetermined range.

Abstract: A slag disposal method for disposing of slags produced in furnaces during iron or steel making processes comprises employing the steps of magnetic sorting of masses of crude slags of a size greater than a value ranging between 300 to 500 mm obtained from the furnaces into slags rich in iron (above about 50 to 60 percent) and slags not rich in iron (below about 50 to 60 percent) and then applying a compressive force to the slags rich in iron to cause a coarse crushing and/or deformation to reduce the size and at the same time increase the iron content due to the breaking and separation of the slags from the metal. Further magnetic sorting and sieving after griding are provided to obtain concentrates having high iron content and to improve recovery efficiency.

Abstract: A shell structure of a heavy-load type rod mill including a barrel having an outlet port and with a plate thickness of t.sub.1, and a pair of trunnions having journals integrally formed thereon and with a plate thickness of t.sub.2, which trunnions are welded to the barrel. At the weld joining the barrel and the trunnion, the relationship between the plate thickness t.sub.1 of the barrel and the plate thickness t.sub.2 of the trunnion is t.sub.1 .ltoreq.t.sub.2 .ltoreq.2t.sub.1.

Abstract: A liner for the outlet port of a rod mill including a cylindrical body provided on the peripheral edge of an opening of the liner and projecting outwardly through the outlet port to prevent a rod from exiting the liner. The projecting length of the cylindrical body on the side close to the end portion of the barrel of the rod mill is preferably longer than that on the opposite side.

Abstract: A slag breaker for breaking slags from furnaces has a stationary breaker plate and a rocking breaker plate defining therebetween a breaking chamber and provided on the opposing surfaces thereof with undulations. The size of the outlet of the breaking chamber is about 1/5 to 2/5 of that of the inlet of the breaking chamber. The size of the outlet of the breaking chamber is internationally changed cyclically and incrementally, by the operation of a hydraulic mechanism which is equipped with a specific dust proof means.

Abstract: A system and method for adjusting a gap between rotary striking blades or hammers and an operating plate in a crusher without interrupting the operation thereof are disclosed. In one embodiment, the system includes a sensing bar provided on a slider, a shifting device for the slider, a moving device for the operating plate and a controlling device electrically connected to motors of the slider and the moving device. In operation, the sensing bar is brought into contact with the rotating striking blades or hammers by shifting the slider, whereby detecting the extent of wear of the striking blades or hammers from the total shifting distance of the slider, and the operating plate is then moved to the extent commensurate with the detected wear.