Sand Making Apparatus, Sand Making Method, and Made Sand

摘要

Provided are a sand-making apparatus, a sand-making method and made sand, which canmake effective use of the excessive by-product powder produced at a crushing step. The sand-making apparatus comprises a crusher (10), a first sorter (30) forwind- or sieve-sorting the crushed material into coarse particles (X), fine particles(Y) and powders (Z), and a dust collector (80) for sucking and recovering the powders(Z). Midway of the first selector (30) and the dust collector (80), there is disposeda second sorter (60) for sorting the powders (Z) into coarse powders (Z1) and finepowders (Z2) by the vacuum of the dust collector (80). The mixture of the fineparticles (Y) and the coarse powders (Z1) is made into the sand, so that contributionis made to an improvement in the properties of concrete and a reduction of the excessby-product powder.