Precious metal refining machine system chemical principle

Precious metal refining machine system chemical principle:
Crude copper (Copper enrichment metal powder)through medium frequency induction furnace smelt,pouring to anode plate,stainless steel cathode Plate as cathode starting sheet,the mixed liquor of vitriol(H2SO4) and copper sulfate (CuSO4) as mixed liquor.
After electrify, copper dissolution into copper ions from anodic move to the cathode (Cu), arrived at the cathode to get electronic then separate out pure cupper(also called electrolytic copper).The impurities in the crude copper more lively than copper such as Tin and zinc will dissolve to ion (zinc and Tin).Because these ions compared with copper ion is not easy separate out, so just need adjust potential difference can avoid these ion separate out on the anode.
The impurity less lively than copper such as gold und silber deposition at the bottom of the electrolyzer.Then electrolytic out the pure copper cathode,which the thickness can get 1-2mm,as the cathode plate of the production slot to continue electrolysis,precipitation in the bottom of the cell called “anode mud”,which is rich in gold and silver,is very expensive,And which reprocessing has a very high economic value.