with large power consumption. according to literature 10 , the most appropriate method for processing the refractory sulfide ore is the method of hydro-chlorination along with thiocar-bamide. as a method of processing the gold-containing tailings of the refractory sulfide concentrates we chose the method of electrochemical oxidation of
perfect compatibility with the flexicone oxidation process. environmental friendliness. low cost of equipment and reagents . iodine-iodide technology leaching of gold, silver and palladium from ores and concentrates. we have developed iodine-iodide gold leaching technology in an environment with a ph of 4-9.
with a fine ore slurry in tanks. heap leaching is generally used to recover gold from low-grade ore, while tank leaching is used for higher grade ore. cyanidation is the primary means of recovery of fine gold and silver. in this process, solutions of sodium or potassium cyanide are brought into contact with an ore, which
extraction is usually low and cyanide consumption is high because of base metal complex formation. several researchers 2-5 reported acidi c thiourea to be more reactive and less affected by suuidj . minerals in complex ores; but, as with caustic cyanide, gold and silver extrac tion is usually low with complex sulfide gold-silver ores. a
about two-thirds of the worlds silver resources are contained in base-metal sulfide deposits reese, 1991 . these ores are beneficiated almost exclusively by flotation. silver recovery during flotation, however, often is low, especially in the complex, fine-grained ores being developed in alaska.
g. deschênes, in gold ore processing second edition , 2016. 4.1 low-sulfide ore. while gold and silver recovery and reagent consumption were dependent on the ore mineralogy table 43.11 . despite the lower gold recovery for the flotation concentrate, the copper dissolution and reagent consumption are both much lower for the thiosulfate
the method of pre-roasting of sulfide ores and their processing products containing gold and silver, assay analysis involves the oxidation of ores oxygen in fireclay boats in a muffle furnace at two modes of firing, and the firing begins at a temperature of 250-300 o c and hold it for 10-15 minutes and finish at a temperature of 450-500 o with
sulphide ores optimize your recovery and reagent consumption for sulfide ores with customized technical solutions. at clariant mining solutions, we are proactive solution-seekers committed to optimizing your mineral processing operations through creative problem-solving.
the kell process is the benchmark in efficient, low-energy metals recovery with low environmental impact - towards a sustainable carbon-neutral, toxic-free mining operation. kell technology the kell process has been developed for extraction of platinum group metals pgm , gold, silver and base metals from pgm sulfide flotation concentrates
ultrasound-assisted leaching as a greener method in mineral processing: improved silver extraction from a sulfide-based mineral concentrate without increasing cyanide consumption
cadmium, cobalt, copper, lead, molybdenum, nickel, silver, zinc, and gold and platinum group metals can be found in sulfide forms. these concentrated ore deposits are considered low grade because of the economic costs associated with processing, but they can be separated economically when prices for these metals rise on the open market.
using cyanide to recover gold from sulfide ores generally results in 30 to 35% recovery, and the best i have heard of is around 50% recovery. the fine coating of a iron compound definitely appears to be a key component of the inability of cyanide to efficiently leach low grade pyritic ores.
in many locations where they had initially been recovering 90% of the assay values processing oxidized surface ore, with the rebellious sulfide ores they were recovering less than 50%. the rest of the precious metals in their ore simply flowed uselessly out from the mill and into the tailings pond.
dissolution of silver from ores56. although it is e ective, high reagent consumption and uncertain extent of gold and silver recovery hinder large scale application. other processes have been developed for the use of halogens in the extraction and recovery of precious metals from ores.
fig. 3: flow sheet of the processing of lateritic ores natural environment research council, 2008 recovery of nickel and processing of magmatic sulfide ores. the processing of magmatic sulfide ores differs from laterites: sulfide ores are crushed in multiple steps to separate the ore minerals from the gangue.