Device and method for recovering high calcium content fine particles from waste concrete, and recycled waste concrete fine particles

Abstract

The present invention provides a recovery method, recovery device, and recycled waste concrete fine particles that can separate and recover high-calcium-containing fine particles composed mainly of cement hydrate from waste concrete using a non-heating method based on density and fine particle content. [Solution] The method for recovering high-calcium-containing fine particles from waste concrete according to the present invention recovers high-calcium-containing fine particles, primarily composed of cement hydrate, from waste concrete generated during concrete demolition. First, the waste concrete is ground in a grinder, and then fine particles with a maximum particle size of 5 mm or less are recovered by sieving. Next, the ground fine particles are fed into a fine particle separation section 2, the underside of which is made of a porous plate 3, and air is blown from below the porous plate 3. By blowing air, the fine particles contained in the ground fine particles are separated into the upper layer, and the separated fine particles can be recovered.

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