A kind of method for the treatment of refractory ascontaining gold ore bath smelting concentration of valuable metals, the present invention, by after treating refractory ascontaining gold ore and coppercontained material, flux mix, joins in composition hightemperature slag, is passed through oxygen and carries out oxidizing semlting.by controlling.
A process of biooxidation followed by thiosulfate leaching of gold from refractory gold concentrate was investigated. mineralogical studies on the concentrate showed that very fine gold grains 10 m were encapsulated in pyrite and arsenopyrite, while the proportion of monomer gold was only 21. the goldbearing sample was identified as a highsulfur fine.
A significant contemporary challenge for gold mining companies is to define economic process options for treating more complex ore bodies as the less refractory ores become depleted. demonstration of economic treatment options allows gold companies to maintain and increase their ore reserves. the selection of options to treat a specific ore is significantly impacted by.
As a pretreatment method of refractory gold ore, carbonaceous matter cmatter flotation was investigated with multistage flotation by rougher, scavenger, and cleaner stages. different dosages of kerosene and mibc 4methyl2pentanol were applied and the optimum dosage was selected by testing in each flotation stage. with the combination of each.
Changes in sulfide sulfur concentration and the formation of oxide phases during fungal treatment were confirmed using raman spectroscopy and xray diffraction analysis. these results suggest that p. chrysosporium is a potential microorganism for oxidative decomposition of metal sulfides associated with refractory gold ores.
Currently, a greater percentage of gold is extracted from low grade, refractory gold ores, following depletion of most high grade deposits 8. increasing complexity of these refractory ores warrants improvement in our fundamental and applied knowledge underpinning sustainable, costeffective, commercial gold extraction process and commodity.
Dispose of arsenicbearing refracttory gold ore. it is an effective method for the carbon refractory gold ore and is used in preprocess of high arsenic gold ore. beijing general research institute of mining and metallurgy has studied a refractory gold ore bearing high arsenic in guizhou. it used water chlorination to leach gold and gold leaching rate.
During the period from 1994 to 2009 the percentage of world gold production from refractory gold ores increased from 5 to over 10. examples of refractory ore treatment include pressure oxidation of flotation concentrates. pressure oxidation of whole ore.
For coarse grain size of gold after crushing and grinding by flotation, gravity concentration, cyanide leaching process or several process combined treatment will be able to complete the separation of gold and gangue minerals, but there are some curing refractory gold ores due to coarse size or thin and gangue minerals symbiosis relations complex factors.
For gold recovery from refractory ores in this article, pretreatment such as bioleaching before cyanidation is discussed as an alternative technique to treat refractory gold ores containing pyrite and arsenopyrite. there are two methods of bacterial leaching, namely stirred reactor bioleaching and bioheap leach processes.
Gold in iron sulfide minerals such as pyrite and arsenopy rite. such deposits are called refractory gold ores due to the encapsulation of fine particles of gold in the ore host. a clear boundary between refractory and nonrefractory ore in terms of gold recovery is not well defined, but several authors have pointed out that less than 60 gold.
Gold miners are facing a reserves crisis, and what is left in the ground is becoming more and more challenging to process.refractory gold reserves, which require more sophisticated treatment methods in order to achieve oxideore recovery rates, correspond to 24 percent of current gold reserves and 22 percent of gold resources worldwide exhibit 1.
Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80 even after fine grinding. 1 arsenicbearing refractory gold ore has stones extremely difficult to deal with. in the stones, gold is locked up in arsenic mineral matrix as the form of microscopic or submicroscopic lattice.
However it is the treatment of refractory gold ores that the greatest diversity of new developments is evident. because of the overwhelming dominance of the cyanide process for gold extraction over the past 100 years. the term refractory applied to a gold ore simply means that a high gold recovery is not attainable by cyanide leaching.
Hydrometallurgy, 34 1994 383395 383 elsevier science b.v., a m s t e r d a m refractory goldbearing ores a review of treatment methods and recent advances in biotechnological techniques nieves iglesias and francisco carranza chemical engineering department, universityof sevilla, 41012 sevilla, spain received janu revised version.
In addition the paper describes the various precyanidation treatment methods for carbonaceous refractory gold ores namely, 1 flotation and depression, 2 blanking, 3 the use of activated carbon or resin in leach, 4 roasting, 5 chemical oxidation and 6 bioleaching. keywords carbonaceous refractory gold ores mineralogy roasting chemical oxidation.
In wet chlorination chlorine or chlorine oxidant is used in the treatment of arsenicbearing refracttory gold ore. the water chlorination is employed to leach the gold and gold leaching rate can reach as high as 91.48. however high cost of chlorides and corrosion of equipment are the main disadvantages in the application of wet chlorination.
Mesothermal gold ores in the archaean yilgarn craton of western australia are dominated by a pyrite arsenopyrite pyrrhotite sulphide assemblage. many of these ores are refractory to varying degrees and require treatment by roasting, bacterial oxidation or finer milling.
Mms has successfully developed the leachox process for the treatment of sulphide gold ores. the leachox process flowsheet can be designed to treat refractory or double refractory ores that contain preg robbers. it can also be used to treat standard, non refractory, flotation and gravity concentrates in a more cost effective manner than.
Oxidative pretreatment of refractory gold oresconcentrates and passivation of carbonaceous material using nitric acid based processes i.e., nitrox and arseno redox were also tested in.
Refractory carbonaceous sulfide ores are treated in a manner so as to improve gold recovery by a treatment in specific combination of steps whereby the ore is treated with chlorine after pretreatment and before cyanidation the particular steps in the treatment of the ore have been found to be necessary as the conventional pretreatment will not improve the yields on any.
Refractory gold ore b y ktanr, karden m.s., department of mining engineering supervisor assoc. prof. dr. n. emre altun february 2017, 113 pages in this work, the possibility of gold extraction using cyanide leaching from a refractory type gold ore, particularly rich in arsenic minerals of realgar and orpiment, was assessed.
Refractory gold ore needs pretreatment for cyanidation to be effective in gold recovery. ailbhe goodbody looks at the advantages and disadvantages of the most common pretreatment options, and speaks to some companies that offer or use the processes a.
Refractory ores, in which gold is often embedded within asbearing and acidgenerating sulfide minerals, are becoming the main gold source worldwide. these ores require an oxidizing pretreatment, prior to cyanidation, to efficiently breakdown the sulfides and enhance gold liberation. as.
Roasting and refractory gold ore . during roasting, refractory gold ore is treated with extremely hot air. this causes the sulfites to oxidize, separate from the ore, and become sulfur dioxide. once all of the sulfides are oxidized, the.
Sherritts refractory gold technology is used to recover gold from refractory sulphide feedstocks. many gold ores and concentrates contain fine grained gold locked within sulphide minerals, such as pyrite andor arsenopyrite, unavailable for recovery by conventional leaching. in sherritts gold process, the sulphide and arsenide minerals are completely oxidized by.
The current high gold price is increasing the focus on the development of refractory gold ores and concentrates. metso outotec can deliver the three main oxidative processes for the treatment of refractory gold concentrates biox, pressure oxidation, and roasting and also supply equipment for ultrafine grinding as a fourth, non.
The ground ore is leached with cyanide in a pipe reactor at a pressure of between 5 and 8 mpa. the terminal ph value of the pulp is controlled to be 10 or less than 10. a.
The leachox refractory gold process has to date been applied to the selectivetreatment of several refractory gold ores but on a relatively small scale.gold recovery optimization of a refractory concentrate by ,01052011 ellis, s., 2003, ultra fine grinding a practical alternative to oxidative treatment of refractory gold ores.
The plant has seen a number of upgrades and modifications in its circuits which were motivated by cost, operational and throughput constraints.the objective of this paper is therefore to highlight the mines experience in the treatment of its complex carbonaceous refractory sulfide gold ores with emphasis on plant operations and improvements.