the magnetic separator machine is assembled on a bucket chain dredger which can lower cost and enhance efficiency.the dredger can dig and suck sand from 0-20m depth underwater and can process about 80-100m3 material per hour .if bigger bucket chain dredger is used , the capacity will reach 200m3/hr, the separation grade of sand is more than 60%.according to customers' request,the dredger can be equipped with one separator or two separator 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.