Water jacket centrifuge is also called Nelson centrifugal concentrator, which is fit for the selecting and recovery of sand gold and rock gold. It¡¯s an ideal equipment for inland, river sand gold and rock gold selecting to replace amalgamating plate. Application shows that the recovery can be as high as 99%, especially for the case in recovering the natural gold in lode ore with 65% of the ore having a milling size of 0. 074mm, the recovery for the natural gold is expected up to 98%. For those natural gold of 0.004mm in particle size, the recovery is 97%. The cleaning up cycle is 1~4 hours for Rock gold, and 4-8 hours for Sand gold.The upgrade ratio is up to 1,000 times