the magnetic separating machine is assembled on a bucket chain dredger which can low the cost and enhance the efficiency. the dredger can dig or suck sand from 10-20m depth underwater and process about 80-100m3 materials per hour.if bigger bucket chain dredger is used, the capacity will reach 200m3/hr.the separation grade of iron sand is more than 60%.according to customers' request, the dredger can be equipped with one separator or two separators or three separators if sand sieving and washing machines are assembled on the dredger,the customer can collect sand for construction at the same time .