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Diy dredge nozzle classifier8/22/2023 ![]() Conventional Suction Dredges do not allow for Much Classification Then, gravity can be used to direct the different size-factions of material to separate recovery systems with controlled water-flows and riffle sizes specifically designed to recover gold effectively from each size-fraction. Feeding a plant well above the ground allows plenty of drop for water and gravity to direct material through multiple sizes of classification screens. This is all rather easy to accomplish with surface processing plants where earth-moving equipment can be used to feed a plant some distance above the ground. The smaller you can classify the size of the material, which can be directed by and even milder flow of water over lower-profile riffles, the finer-sized gold that you can effectively recover. The small-sized material can then be directed to a milder-flow of water over a shorter set of riffles. It is well-established that if you want to effectively recover finer particles of gold, you must first separate them from the larger-sized materials which are being washed through your recovery system by a higher-velocity flow of water. Classification is the Key to Fine Gold Recovery
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