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Developments in the pretreatment of refractory gold minerals by nitric acid D.X. LI College of Environmental Science and Engineering, China The paper covers many literature reports of processes using nitrogenous species as an oxidant for processing refractory gold ores, especially development in the pretreatment of refractory gold
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 .
Pretreatment 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, .
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
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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 ( sulfurbased compounds or carbon,), or grinding, in order to free smaller particles of gold that are trapped inside other elements or inside the gangue.
mainly about the refractory gold leaching easily through arsenic removal to expose gold, changing the composition, physicchemical and electrochemical properties of the ore. Currently, there are four main methods of pretreatments of refractory gold ores with As. Pretreatment options for dealing with refractory gold ores are illustrated in Fig ...
Microwave assisted pretreatment of refractory gold concentrate. Gold is considered to be refractory when it cannot be easily recovered by alkaline cyanide leaching. The vast majority of refractory gold occurs in sulphidic minerals such as pyrite .
The characteristics of refractory gold ores and the principles of selecting pretreatment program are development and new trends of the methods of roast,pressure oxidation and bio oxidation in recent years are summarized.
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 .
Research status of carbonaceous matter in carbonaceous gold ores and biooxidation 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
The treatment process of a lowgrade refractory gold ore containing sulfide minerals and carbonaceous matters was studied in this work. The gold extraction of this ore by allsliming cyanidation was only %. Hence, a pretreatment was necessary. In this paper, a flotationpreoxidationcyanide leaching process was developed.
MICROWAVE IRRADIATION PRETREATMENT OF A REFRACTORY GOLD CONCENTRATE by 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.
Figure Process options for thermal pretreatment of refractory ores ..... 25 Figure Decomposition of FeS2 to FeS as coal is heated above 500°C ..... 26 Figure Mechanism for aggregation of gold particles during the roasting of
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
It has been established that a processing scheme consisting of calcination followed by cyaniding gives a % recovery of gold from the concentrate, which is % higher than obtained in the control test. 3. A model has been developed for the process of heating a goldcontaining gravity concentrate in a microwave radiation field.
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 ...
Sep 01, 2007· Microwave pretreatment of a double refractory gold ore Microwave pretreatment of a double refractory gold ore Nanthakumar, B.; Pickles, ; Kelebek, S. 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.
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 ...
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 .
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 glass reactor with aeration and stirred at 250 rpm. Leach solutions were prepared using deionizeddistilled water at the prescribed concentration of reagents.
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.
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 ...
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 .
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