METHOD AND DEVICE FOR RECOVERING GRAIN IRON FOR PULVERIZATION OF BLAST FURNACE WATER GRANULATED SLAG

PURPOSE:To provide the device for prolonging the service life of a vertical type roller mill by attracting the grain iron extruded from an inner peripheral side at the time of pulverizing blast furnace water granulated slag by means of an electromagnet plate provided at a pulverized matter collision plate, thereby facilitating the sepn. from a coarse-grain component and increasing the recovery rate of the grain iron. CONSTITUTION:This grain iron recovering device 9 is constituted of the pulverized matter collision plate 7, the electromagnet plate 8 mounted thereto and a partition plate 16 segmented from hot air flow 11 from a wind box 4 and is installed over the entire circumference so as to enclose the outer peripheral part of the table 2. The pulverized matter which is mixed with the grain iron and is passed and moved through the groove part of a curved part then through the projecting part 6 of the outer peripheral part of the table by the centrifugal force of the table 2 is brought into collision against the pulverizing collision plate 7 and is transported upward by the hot air flow 11. The grain iron is moved in a descending direction by a specific. gr. difference and is nearly horizontally moved by the attraction force of the electromagnet plate 8 fixed to the collision plate 7, by which the grain iron is attracted to the electromagnet plate 8. The attracted grain iron is dropped and recovered into the grain iron recovering device 9 by the periodic control to open a magnetic field power source.