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我们采用一种简便易行的方法来收集铁屑:将条形或蹄形磁铁用塑料薄膜(或布、厚纸等)包起来。然后用其两极在河沙中反复移动,由于一般河沙中都杂有铁砂,所以不用多久,磁铁周围就会吸引附着不少铁屑,再将磁体与铁屑一起拿到纸上或容器中,把包磁体的塑料薄膜拿下来,使磁铁离开铁屑,铁屑就会掉到纸上或容器中,收集起来待用。在这里需要注意的是,磁铁外面必须包上塑料薄膜,如果用裸露的磁铁去吸铁屑,虽然也可以吸附砂中铁屑,但要从磁铁上取下铁屑,则很困难。
We use a simple and easy method to collect the iron scraps: Wrap the bar or shoe magnets with a plastic film (or cloth, thick paper, etc.). Then use its poles to move repeatedly in the river sand. Since iron sand is common in the river sand, it will take a long time for the magnets to attract a lot of iron scraps around and then take the magnets together with the iron scraps onto paper or containers. Remove the plastic film containing the magnets so that the magnets leave the iron chips. The iron chips will fall onto the paper or container and be collected for use. It should be noted here that the magnets must be coated with a plastic film. If bare irons are used to attract iron chips, although it is also possible to adsorb the iron chips in the sand, it is difficult to remove the iron chips from the magnets.