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Then, frictional resistances between sand particles is eliminated, viscosity drops to zero and liquefaction is achieved. the second concentrator was described to me by an acquaintance on the net. he had ground black sand to 400 mesh in a small ball mill to release hidden gold values. i assume the material was dry but i cannot confirm this.
My mill is built out of scrap steel, so the strikes are probably all made of mild steel. the drum is an old water pressure tank, and is allot harder than mild steel. it eats 2.5 material pretty fast, and spits it out beach sand fine, and finer. i too have the option of running my mill wet, but have found that i like to run mine dry.
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