The zinc precipitation process, the Merrill-Claude process, is a very mature and well known technique. For the case where the amount of the leachate is small and the gold concentration is high, it is suitable to use zinc precipitation. The zinc precipitation process typically involves leachate precipitation, degassing, precious metal precipitation, and sediment filtration. The reaction of gold precipitation onto the zinc surface can be expressed by the following formula:

2Au(CN) 2 - +Zn 2Au+Zn(CN) 4 2-

Zinc consumption is an important consideration when using the zinc powder (silver) precipitation process. The theoretical consumption of zinc by chemical formula should be 0.17 g of Zn∕gAu. In fact, the consumption of zinc varies greatly depending on the chemical nature of the solution. For dilute heap leaching, the zinc consumption per gram of gold precipitated varied from 10 to 30 g. The consumption of excess zinc is mainly due to impurities in the leachate and dissolved oxygen.

The C stud Roll Forming Machine is rollformer used to produce the C stud frame. the c stud frame machine is used with the U track frame, which together to form the drywall and suspended ceiling system. Same as the U track roll forming machine, the c stud roll forming machine include the decoiler, the main rollforming system and the hydraulic system, the receiving table. there are normal sped c stud machine, which is 25-30 meters per minute. the U track machine , which is about 60 meters per minute.

U Track Rollformer

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