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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 non-refractory ore in terms of gold recovery is not well defined, but several authors have pointed out that less than 60% gold
Pretreatment Of Refractory Ores Prior To Gold Leaching ... Pretreatment Of Refractory Ores Prior To Gold Leaching ... The most common leaching process for gold dissolution involves cyanidation, a process that has ...
In addition to the enhanced grindability, gold was released from the matrix of the host minerals at a coarser size, resulting in a significant increase in free gold recovery by gravity concentration. For a gold ore with a head grade of 6˙4 gt −1, the gold recovery improved from about 28% to 40% after microwave pretreatment.
reagent on cyanidation of refractory gold ore. Cyanide leaching of the concentrate was performed at 20%-w/w of solid (500 gram of refractory sulfide gold ore concentrate) in a 2.5-liter glass reactor with aeration and stirred at 250 rpm. Leach solutions were prepared using deionized-distilled water at the prescribed concentration of reagents.
The microwave pretreatment of a typically refractory flotation gold concentrate was investigated. The results demonstrated that a maximum gold recovery of 97% was achieved, and that gold ...
MICROWAVE IRRADIATION PRETREATMENT OF A REFRACTORY GOLD CONCENTRATE by K.E. Haque CANMET, 555 Booth St., Ottawa, Ontario, KIA OGl, Canada ABSTRACT Microwave energy was applied in the pretreatment of a typical refractory arsenopyritic gold concentrate.
With regards to the application of microwaves to refractory gold ores, Haque, 1987a, Haque, 1987b has studied the microwave pretreatment of refractory sulphidic ores and achieved gold extractions of over 98%. However, there is no information published on the microwave processing of the double refractory gold .
(a) non-refractory or free milling, with over 95% gold recovery, (b) mildly refractory, with 85-95% recovery, (c) moderately refractory, with 50-80% recovery and (d) highly refractory, with under 50% recovery. Research on refractory gold ores has shown that existence of submicroscopic gold particles is the main cause for refractory ores.
Pre-treatment of a refractory gold sulfide ore by means of ... by nitric acid, roasting or pressure oxidation....This last fact suggested high oxidation of the ...of refractory gold ores", Minerals Eng, 2, .
The process of crushing or decomposition before gold leaching is called pretreatment of refractory gold. Statistics show that, in the world, about 2/3 gold resource belongs to the difficult processing ores, and about 1/3 total output of world gold is produced from refractory gold. This proportion will further increase in .
Figure 2.12 Process options for thermal pretreatment of refractory ores ..... 25 Figure 2.13 Decomposition of FeS2 to FeS as coal is heated above 500°C ..... 26 Figure 2.14 Mechanism for aggregation of gold particles during the roasting of
Research status of carbonaceous matter in carbonaceous gold ores and bio-oxidation pretreatment ... Carbonaceous gold mines are important refractory gold ores. The previous results demonstrate that the carbonaceous matter is mainly composed of elemental carbon, organic acid and hydrocarbons. The dissolved aurocyanide complex is robbed by
Sep 01, 2007· Microwave pretreatment of a double refractory gold ore Microwave pretreatment of a double refractory gold ore Nanthakumar, B.; Pickles, C.A.; Kelebek, S. 2007-09-01 00:00:00 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.
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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 .
Gold Refractory Ores Microwave Assisted Recovery XSM is a leading global manufacturer of crushing and milling equipment (Gold Refractory Ores Microwave Assisted Recovery),XSM also supply individual (Gold Refractory Ores Microwave Assisted Recovery...) crushers and mills as well as spare parts of them.
By using the heating feature of microwave, it has shown from condition tests that the gold leaching recovery can be improved from 74% to more than 90% if the gold concentrates is treated for 5 minutes in a microwave oven at 450℃. Therefore, the gold leaching recovery of cyanide residue of more than 86% can be obtained in leaching plant. The results indicate that microwave pretreatment to ...
Microwave pretreatment of refractory gold... & related info |... (2003) Gu et al. Nonferrous Metals. The microwave pretreatment processes of refractory gold ores in solid and slurry, and effects of the microwave... Customer Service
The characteristics of refractory gold ores and the principles of selecting pretreatment program are introduced.The development and new trends of the methods of roast,pressure oxidation and bio oxidation in recent years are summarized.
improved grindability and gold liberation by microwave – Gold Ore . pretreatment of refractory gold ore with microwaves . a Sulphide Leach Process. Techniques used to recover gold from refractory .
It has been established that a processing scheme consisting of calcination followed by cyaniding gives a 94.8% recovery of gold from the concentrate, which is 8.3% higher than obtained in the control test. 3. A model has been developed for the process of heating a gold-containing gravity concentrate in a microwave radiation field.
The treatment process of a low-grade refractory gold ore containing sulfide minerals and carbonaceous matters was studied in this work. The gold extraction of this ore by all-sliming cyanidation was only 11.75%. Hence, a pretreatment was necessary. In this paper, a flotation-preoxidation-cyanide leaching process was developed.
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.
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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