microwave pretreatment of a refractory gold

One possible remedy is to roast the ore and thus oxidize the pyrite and remove the organic carbon. In this research, microwave roasting of a double refractory gold ore was investigated as an alternative method and the results were compared to those obtained by conventional roasting. Abstract: To provide a theoretical basis for a suitable process to extract gold from refractory gold concentrates, process mineralogy on the acid leaching residue of gold calcine was studied by chemical composition, X-ray diffraction, scanning electron microscopy-energy spectrum, and mineral dissociation analysis.The results showed that the acid leaching residue contained Au 68.22 g/t, Ag 92

Gold recovery from refractory gold concentrates by

Gold recovery from refractory gold concentrates by pressure oxidation pre-treatment and thiosulfate leaching Li Yu 1, Shimei Li 1, Quanjun Liu 1*, Jiushuai Deng 2,1*, Bin Luo 1, Yuanqin Liang 1, Liuchuang Zhao 1, Hao Lai 1 1 State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Faculty of Land Resource Engineering,

It was also found that pretreatment only in highly alkaline media (pH 13) can be effective in gold recovery. Gold and silver extractions during subsequent cyanidation were improved from 69.4 to 80.7% for gold and 44.4 to 88.9% for silver, where the extraction yields of arsenic, iron, and zinc were 93.7, 75.9, and 26.9%, respectively.

Double refractory gold ores, such as Barrick's Goldstrike ore, contain both pyrite and carbonaceous matter and the latter results in the loss of gold from solution during cyanide leaching. One possible remedy is to roast the ore and thus oxidize the pyrite and remove the organic carbon. In this research, microwave roasting of a double refractory gold ore was investigated

A total gold extraction of 70.2% could only be reached via direct cyanidation from a refractory As-, S- and C-bearing gold concentrate calcine, and the gold extraction varied noticeably with different size fractions. The reasons for unsatisfactory gold extraction from the calcine were studied through analyses of chemical composition, chemical phase and SEM-EDS of different sizes of particles.

A new pretreatment technology of refractry gold ore-mincrowave roast is introduced.Its principle and research situation in the country and oversea are described. Through comparisons with other pretreatment methods, the advantages of microwave roast are exhibited evidently Problems need to be solved at present are brought forward.


Use of Ozone for Gold Extraction from a Highly Refractory

Ozonization in acidic media of an arsenopyritic-pyritic highly refractory gold concentrate (110 g Au/t) as a treatment prior to cyanidation was evaluated. While the conventional cyanidation of this concentrate recovers only 9% of the gold, a pretreatment with ozone before the cyanidation increases the gold recovery to 23%.

Demonstration of economic treatment options allows gold companies to maintain and increase their ore reserves. Refractory gold ores are those that do not yield high gold recoveries in conventional cyanide-leaching circuits, even when the ore is finely ground. The cause of low gold recoveries can be either

Fracture and emolliating of rocks has been traditionally used in the process of ore dressing. This process has always been given great attention. At the present stage of development of mining and processing industries except energy the efficiency of crushing rock and the increase the degree of extraction the problems arise preservation of individual inclusions crushed material or separation.

Metallurgical ContentRecover Gold by Roasting Pyrite OreRoasting of flotation concentratesRoasting Arsenopyrite Ore for GoldRoasting and leaching a sulphide concentrateRoasting and Processing Sulpho-telluride ore to recover goldFluoSolids Roasting SystemRoasting with a FluoSolids reactorWhy use Salts in the roasting processROASTING WITH SODA ASHGOLD LOSSES IN ROASTINGCalcination

The Use Of Microwave In Refractory Ore Benification. Microwave pretreatment of a double refractory gold ore . Sep 01 2007 Microwave pretreatment of a double refractory gold ore Microwave pretreatment of a double refractory gold ore Nanthakumar B. Pickles

microwave assisted pretreatment of refractory gold ores Gold Ore Crusher. Refractory Ore Gold And Pretreatment 2012, process crusher Refractory Ore Gold And Pretreatment 2012 164 Views. The is the professional mining get price. flotation method refractory gold ore

Pretreatment Process on Refractory Gold Ores with As J Stage Keywords: arsenic bearing gold ore, pretreatment process, refractory gold ore For technology, it developed from a roasting to two, from air to oxygen enriched roasting Microwave roasting is a new pretreatment, 24/7 Online; The Use Of Microwave In Refractory Ore Benification

The microwave is the electromagnetic radiation with the frequency in the between 300 MHz~300GHz. The microwave technology in metallurgy application research are mainly in heating, drying, oxide reduction, mineral processing such as the pretreatment of refractory gold and waste treatment, and metal recovery. The stone coal vanadium ore grinded was dealt with the microwave pretreatment in

Microwave assisted roasting for enhanced processing of

refractory gold ores can yield low rates, so they require implementation of extra stages, such as roasting, in order to eliminate the compounds that cause the refractoriness (e.g. sulfur-based compounds or carbon,), or grinding, in order to free smaller particles of gold that are trapped inside other elements or inside the gangue.

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Pretreatment Process on Refractory Gold Ores with As J Stage Keywords: arsenic bearing gold ore, pretreatment process, refractory gold ore For technology, it developed from a roasting to two, from air to oxygen enriched roasting Microwave roasting is a new pretreatment, 24/7 Online; The Use Of Microwave In Refractory Ore Benification

Metallurgical ContentRecover Gold by Roasting Pyrite OreRoasting of flotation concentratesRoasting Arsenopyrite Ore for GoldRoasting and leaching a sulphide concentrateRoasting and Processing Sulpho-telluride ore to recover goldFluoSolids Roasting SystemRoasting with a FluoSolids reactorWhy use Salts in the roasting processROASTING WITH SODA ASHGOLD LOSSES IN ROASTINGCalcination

The technological mineralogy of a gold deposit located in North-Western province of Zambia was carried out by using X-ray fluorescence spectroscopy (XRF), X-ray diffraction spectroscopy (XRD), and scanning electron microscope (SEM). The results showed that gold was highly dispersed in gold-bearing minerals such as pyrite, arsenopyrite, and some gangues in the form of natural gold and electrum.

Pretreatment of Refractory Ore in Gold ore processing. Please contact us through Live Chat to get price quotation and more info. high sulfide minerals gold ore tech microwave – Crusher South Africa. Microwave pretreatment is one of the emerging technologies A refractory ore generally contains sulfide minerals, Jaw Crusher. Impact Crusher.

For extraction of gold from the refractory ores in which gold is surrounded by sul-fide minerals, oxidative pretreatment of the ore is essential to oxidize the sulfides and expose gold. Pyrometallurgical oxidation by roasting is encountered with environmen-tal limitations; thus hydrometallurgical methods are preferred. These methods include

Amankwah, R K, Pickles, C A and Yen, W T (2005), "Gold recovery by microwave augmented ashing of waste activated carbon", Minerals Engineering, 18, 517-526. Amankwah, R K, Yen, W T and Ramsay, J (2005), "A two-stage bacterial pretreatment process for double refractory gold ores", Minerals Engineering, 18, 103-108.

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