| 摘要 |
A method of reclamation of the used foundry sand, especially with an inorganic geopolymer binder system, wherein the reclamation occurs in batches so that friction elements located on two shafts rotate inside each dose of the used sand, wherein the reclamation is done by rotation of the impact bars (3) in the used sand moving in the fluidized bed, where the volume ratio of impact bars (3) to the volume of the batch of the used sand is in the range from 0.03 to 0.10, wherein the air passes through the layer of the sand with the velocity which ranges from 1,5 to 4 times the threshold velocity of fluidization, wherein for quartz sands the fluidization threshold speed is equal to 0,17 m/s. An equipment for performing the method of reclamation of the used foundry sand according to the claims 1 to 3, comprising a container casing (1), in which shafts (2) provided with impact bars (3) are arranged in a certain distance between them, wherein the container casing (1) has in its ground plan section shape of an oval, wherein spaced from its bottom there is a permeable bottom (6) of the fluidized bed attached on a carrier (5), and further, the container casing (1) is in its upper part provided with a dosing opening (8), wherein in its lower part has the container casing (1) the unloading opening (9) and the inside of the container casing (1) is provided with a wear-resistant lining (11), furthermore, in the container casing (1) there is arranged a pair of vertically oriented shafts (2) on which cylindrical impact bars (3) are attached. |
