Feb 19, 2011· a crystallophysical method of refining materials that consists in the movement of a narrow fusion zone along a long solid rod made of the material that is being refined. Nearly all industrially important metals, semiconductors, dielectrics, and inorganic and organic compounds— more than 120 substances—may undergo zone melting.
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Gold material are melt and cast into gold anode for electrorefining to obtain high purity gold (Au≥%) . Gold electrorefining is taken place in FRPP electrolysis cell. Crude gold casting plate is used as anode while high purity gold plate is used as cathode. Gold ER uses chloride solution and free hydrochloric acid as electrolyte.
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The two gold refining methods most commonly employed to derive pure gold are: the Miller process and the Wohlwill process. The Miller process uses gaseous chlorine to extract impurities when gold is at melting point; impurities separate into a layer on the surface of the molten purified gold.
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