Phelps Dodge is hardly a stranger to SX/EW, having first used the environmentally friendly process on a large scale in 1987. In 1985, the company initiated large-scale leaching of oxide ores and waste dumps using sulfuric acid and, two years later, using SX/EW to recover the copper.
copper sulphate to an EW plant at another location with lower power unit cost. The disadvantage is the problem of recycling the sulphuric acid regenerated in EW back to the leach/SX facility. Cementation Cementation with scrap iron is a long-established process which largely met its demise with the advent of SX/EW.
Jun 16, 2020 Based on test-work results, pressure leaching is operating at 220 C and 7 bar oxygen overpressure. Copper from is recovered by SX-EW. The client in this case has an existing heap leaching operation, and this was used to neutralize …
LX-SX-EW aims to concentrate the aqueous copper solution from a few g/l to around 40-50 g/l and to eliminate the chloride, ferrous, manganese and other impurities that may cause problems in the downstream electrowinning process. There are six different methods for leaching: heap, dump, in-situ, agitation, autoclave and vat.
In the ten years from 2003 to 2013 global mine production of copper has increased by over 23% to meet demand while the weighted average head grade has dropped from 0.9 to 0.7% Cu.
Heap leaching & SX-EW is a method of extracting pure copper from oxide ore by placing the crushed ore on a pad in a heap and spraying the leaching solution, sulphuric acid, over the heap. The acid trickles through the heap and dissolves the copper mineral into solution. The leach solution collects at the bottom of the pad in a collection pond.
Copper recovery by L/SX/EX in 1968 In 1968 there were only two widely practiced copper leaching processes using dilute sulphuric acid. The first process, vat leaching of high-grade copper oxide ore followed by EW of copper from the leach solution, produced low quality copper cathode at relatively high cost. In 1968 the tonnage of high-
Solutions after leaching with copper content up to 1.5 g/dm3 are suitable for the SX-EW process. 3. CONCLUSION Results of experimental laboratory testing of copper leaching from flotation tailings indicate that the highest degree of copper leaching was achieved in the following process parameters: time: 4 h,
Dump Leach/SX-EW Casa Grande In Situ/SX-EW Miami Oxide Heap Leach/SX-EW1 Dump Leach/Cementation Mineral Park In Situ/Cementation Dump Leach/Cementation Sierrita Sulphide Dump Leach/SX-EW2 Twin Buttes Sulphide Oxide Agitation Leach/SX-EW Total TABLE 1 (CONT'D) COPPER AND MOLYBDENUM PRODUCTION OF LARGE ARIZONA COPPER …
Jul 27, 2020 Figure 6: Aerial Photo of 25 Million Pound Per Year SX-EW Plant. The SX-EW plant is currently only 20% utilized. Figure 7: High-Grade Waste Area. A total of 11 to 12 million tonnes of high-grade waste has been placed since early 2019 and by the end of 2022, approximately 48 to 52 million tonnes are expected to be under irrigation. Figure 8 ...
Leach rates of up to 250 kg/h have been achieved processing copper concentrates, zinc concentrates and blends of different types of sulphides, according to the company. The pilot plant also contains a solvent extraction and electrowinning (SX-EW) section and has successfully produced high purity copper cathodes as a proof of concept.
Agitation 1 – 35 1.4 – 2.0 Ambient or elevated Low – high Concentrate 25 – 80 1.0 – 2.0 Highly elevated High Figure 1. Copper production processes from various ore reserves. SX/EW was developed to treat oxide ores, which were considered to be waste. It was discovered that secondary sulfides could also be leached.
Feb 01, 2017 Even though a large number of molecules with a wide variety of extractive functionalities have been proposed as extractants to be used for the recovery of copper from sulfuric acid leach solutions, only the hydroxy oximes have been used in commercial copper SX-EW plants. The basic structure for these copper extractants is shown in Figure 8.
Sep 26, 2019 The development of SX-EW has allowed copper extraction in areas where sulfuric acid is not available or cannot be produced from sulfur within the copper ore body, as well as from old sulfide minerals that have been oxidized by exposure to air or bacterial leaching and other waste materials that would have previously been disposed of unprocessed.
The mineralogy of copper leaching: concentrates and heaps. Copper ‘81, Copper Hydrometallurgy Short Course. Ottawa, June 1991. Google Scholar ... Anon. Trends and implications of the continued developments of sx/ew copper production. Pincock, Allen and Holt, Inc., March 1990. Google Scholar. 26. Anon. Predicted sx/ew copper production. …
leaching is subjected first to copper SX and EW to recover the copper and second to zinc SX and EW to recover the zinc after removal of some impurities such as iron, silica, etc. The acidic raffinate solution leaving SX is recycled to the leaching operations. A series of process flowsheet were designed and developed, and a comparative analysis was
Sulphuric acid used as the leaching agent is a by-product of pyrometallurgical copper production at KGHM. Initially it was utilised or sold. With the SX-EW method in place sulphuric acid is curetly used by all KGHM's facilities in the world. KGHM applies this technology at several of its facilities: Sierra Gorda in Chile.
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