Dry separation method of volcanic ejecta deposit minerals, dry separation device of volcanic ejecta deposit minerals, manufacturing method of fine aggregate and volcanic glass material

摘要

PROBLEM TO BE SOLVED: To provide a dry type separation method of a volcanic ejecta mineral deposit, that can increase the yield of fine aggregate with a density of 2.5 g/cmor more, and thereby improve a conventional method for regulating particle size of ordinary Shirasu.SOLUTION: A gravel fraction is removed from a volcanic ejecta mineral deposit and the remainder is fed to at least one kind of a wind-force sorter 11 selected from among a circulation type wind-force sorter and a blowing-up type wind-force sorter, in order to be sorted into a coarse grain fraction and a fraction other than the coarse grain fraction. The coarse grain fraction is fed to a specific gravity difference sorter 21 of an air table type, which blows air from below toward a porous plate while oscillating the porous plate inclined at a predetermined angle from a horizontal direction, and then a selection from an upper end of the porous plate is recovered as fine aggregate.SELECTED DRAWING: Figure 1