| 摘要 |
PROBLEM TO BE SOLVED: To easily and surely separate mixed sand of Ni ore slag-made spherical artificial sand and natural silica sand into both these sands. SOLUTION: The mixed sand of the Ni ore slag-made spherical artificial sand and the natural silica sand is heated at≥400°C, desirably≥600°C and further desirably at 1000°C and thereafter, the artificial sand and the natural silica sand are classified with a magnetic separation. Regenerated sand is heated at≥400°C and then, the blackened natural silica sand can be changed into the white color with the casting, and the artificial sand is held to the black color even by heating and therefore, both these sands can be distinguished with the visual observation. The progressing degree of the classification can be confirmed with the naked eye and can surely be separated by performing the magnetic separation to both these sands. In this way, the effect of which the containing ratio of the artificial sand can surely be managed can be obtained. COPYRIGHT: (C)2007,JPO&INPIT
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