| Popis: |
This paper makes an experimental research of the thermal and wet reclamation technology of used sodium silicate bonded sand, determines the technological process of thermal and wet reclamation of used sodium silicate bonded sand, and found that the larger the size of sand lump is, the longer the granulation will take; the higher the water temperature is, the shorter time the granulation of sand lump will need; and the stirring of water can significantly reduce the granulating time of sand lump. The quality of sodium silicate bonded sand reclaimed by a combination of stirring scrubbing and flushing overmatches the sand reclaimed by pure flushing; and as the water temperature goes up, with the same conditions of reclamation, the content of residual Na2O in the reclaimed sand will drop, and the ratio of removed binder film will increase. Compared to raw sand, the tensile strength of ester-hardened sodium silicate bonded sand mixed by reclaimed sand is slightly lower. |
