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Gold ore whose types of deposits are diverse and complex is the mineral assemblage of gold. With features of chalcophile affinity and high melting point, the gold ore includes conglomerate type, porphyry type, quartz vein type and volcanic rock type, etc.

Gold ore whose types of deposits are diverse and complex is the mineral assemblage of gold. With features of chalcophile affinity and high melting point, the gold ore includes conglomerate type, porphyry type, quartz vein type and volcanic rock type, etc.

For gold extraction the most used extraction technique is the MerrillCrow process which uses lixiviants as sodium or potassium cyanide for gold leaching at alkaline conditions

Cyanide is one of toxic compound composed of carbon and nitrogen which usually found in wastewater of many process industries such as electroplating nylon fibers resins herbicides and mineral processing plant For example Cyanide is used in industrial processes for gold and silver extraction Khodadadi et al 2005 Extraction of gold

Cyanide control in the metallurgical process of gold extraction in AngloGold SA Influence of oxygen Whilst cyanide is one of the major drivers if not the major driver of gold dissolution it cannot be viewed in isolation particularly in respect to the relationship between cyanide and

Jun 25 2018 · Gold is a precious commodity and as a result large scale extraction operations are prevalent Negative Effects of Gold Mining The price of gold has skyrocketed People are digging into their jewelry box to find gold to sell and others are panning for gold hoping to find that giant nugget The chemical cyanide is used in the

Gold Cyanide Heap Leaching Process shangyichem com Gold Cyanide Heap Leaching Process The successful application of heap leaching to the extraction of gold from lowgrade deposits has been one of the main factors in higher output since the 1970s especially in the United States It is a low cost process that extracts a soluble precious metal or copper compound by dissolving the metal content

The maximum grade of 7182 ppm with 9903 extractionrecovery of gold and 3434 ppm with 7383 extraction of silver was obtained for 30 minutes ground sample at dosage of sodium cyanide NaCN

Already 75 years ago it was found in batch experiments that hydrogen peroxide increases the gold extraction rate but the results were not convincing enough It was also found that hydrogen peroxide attacks the cyanide a process which was developed over the last 10 years by Degussa to destroy cyanide in gold mine effluents

Production Output The effect of pH on gold extraction Condition 20 solid 06 MPa 300 min1 80°C 1 NaCN 1 h Parga et al 2007 The recovery of gold in the leaching process is the result of a chemical reaction which is pH dependant Optimum levels of gold extraction can only occur when the pH is at the correct level The extraction

After various experiments upon the raw concentrates it was found that if the material was ground to 100mesh and agitated for 32 hr about 85 per cent of the gold and 70 per cent of the silver could be extracted at an expense of about 65 lb of cyanide per ton This result promised a very fair return especially in a case where no other