leaching of copper from tailings using ammonia

In situ recovery, an alternative to conventional methods

Copper is the most popular commodity (after uranium) that is mined by ISR (Table 1). There are references to primitive forms of in situ leaching of copper in Roman times, and maybe even long before that in China (O'Gorman et al., 2004). The San Manuel copper mine in Arizona is the best known copper mine exploited by ISR (O'Gorman et al., 2004).

Industrial Application of Ammonia Assisted Cyanide Leaching

AMMONIA ASSISTED CYANIDE LEACHING Previous WorkThe use of ammonia to reduce the consumption of cyanide during the leaching of gold from copper-bearing ores was patented in 1902 by Bertram Hunt (Hunt 1902), during the first period of intense R&D activity in gold metallurgy that followed the invention of the cyanide process by J.S. MacArthur and

From Tailings to Treasure? Miners Make Money Reprocessing

New technology allows it to recover up to 40% of the gold left in particle form in tailings. DRD Gold extracted 33,600 ounces of gold, worth nearly US$40 million, in the last quarter of 2013. Mintails, a mine tailings processor, has developed new technology to process 350,000 tons of slimes from its extensive tailings resources.

Copper recycle from sulfide tailings using combined leaching

A comparison leaching with alkaline bacteria, ammonia or a combination of the two clearly indicated that copper recovery was remarkably better with combination that Cu extraction rate increased from 4.42% (48 days, ammonia leaching) or approximately 20% (30 days, alkaline bacterial leaching) to 29.57% (30 days, combined leaching).

PDF The use of geometallurgy in the processing of a complex

ammonia into the cyanide leach, was published in 2018 (Hedjazi & Monhemius, 2018). the gold remaining in the tailings by cyanide leaching.A geometallurgical factors, such as gold grade, copper grade, cyanide leaching amenability and consumption, and ore mineralogy. 4 The use of geometallurgy

A REVIEW OF COPPER CYANIDE RECOVERY FOR THE

insoluble. There have been a number of studies into the application of the copper/ammonia/ cyanide process for the treatment of copper-containing ores (6, 7). It has been shown that the addition of ammonia to the cyanide solution results in a lower cyanide consumption and an increased selectivity of gold leaching over copper.

Optimal Conditions for Ammonia Leaching of Copper/Chalcocite

Ammonia leaching can be used in non-oxidative, oxidative and reductive leaching [16]. The ammonia leaching process is more environment friendly than conventional acid heap leaching, which uses sulphuric acid to dissolve copper and cobalt [11]. The reported difficulty encountered with the ammonia leaching approach, however,

ammonia-ammonium chloride leach copper minerals - BINQ Mining

leaching of copper from tailings using ammonia/ammonium chloride . Leaching of copper from tailings using ammonia/ammonium chloride for leaching of different copper minerals. 13,14 The The Ammonia Leach for Copper »More detailed

Common Copper Tailings Reprocessing Methods-xinhai

The leaching of copper tailings is to convert the solid phase copper compound into the copper ion in the liquid phase, and then extract the metallic copper from the leaching solution. According to different leaching reagents, it can be divided into acid leaching, ammonia leaching, bacterial leaching, and electrochemical leaching.

PDF] Selective leaching for the recovery of Copper from

This paper reported on the leaching behavior of printed circuit board (PCB) using a new leaching agent of ammonia-ammonium persulfate, to recover copper. Cu and Zn leaching were found to be fast and reached equilibrium in 6h whereas for Ni, prolonged leaching time was needed. The best leaching efficiency was found to be around 99% Cu, 60% Zn and 9% Ni with 5M ammonia, 0.5M

PDF Leaching of Malachite Ore in Ammonium Sulfate Solutions

In ammonia leaching of oxidized copper ores, as the dissolution reactions happen at mildly acidic or basic conditions, some metal impurities, which pass into the solution during the dissolution of ore, precipitate because of the high pH of the solution.

AMMONIA LEACHING IN THE COPPER INDUSTRY: A REVIEW

Ammonia leaching was first used for recovery of non-ferrous metals such as copper from oxide ores or ores containing pure copper, but gradually the use of this technology was developed from more

US3403020A - Leaching of copper from ores with cyanide and

US3403020A US418324A US41832464A US3403020A US 3403020 A US3403020 A US 3403020A US 418324 A US418324 A US 418324A US 41832464 A US41832464 A US 41832464A US 3403020 A US3403020 A US 3403020A Authority US United States Prior art keywords copper cyanide ore hcn recovery Prior art date 1964-12-14 Legal status (The legal status is an

Heap leaching - Wikipedia

Heap leaching is an industrial mining process used to extract precious metals, copper, uranium, and other compounds from ore using a series of chemical reactions that absorb specific minerals and re-separate them after their division from other earth materials.

PDF The selective leaching of copper from a gold-copper

gold leaching either using the same process at elevated temperature (40-60 °C), as patented by the authors, or using a cyanidation process. Copper selective leaching will reduce the gold losses due to a cementa-tion mechanism of gold in the presence of metallic copper as all of the metallic copper will dissolve in the pre-leaching stage.

Copper Oxide Leaching - Continuous Vat & Glycine Leaching

compared to acid leaching Recovers additional revenue from copper oxides with precious metal credits Glycine has the potential to leach precious metals as well as copper oxide. The graph shows how gold and copper can be leached simultaneously from a tailings. GlyLeachTM can continually extract the copper to completion with minimal slumping

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