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study on microwave pretreatment of refractory

The cyanide leaching rate of gold was 92.03% by microwave roasting with roasting time of 15 min and roasting temperature at 480°C; and the cyanide leaching rate was 86.63% by conventional

leaching of refractory gold ores by microwave irradiation

The non-isothermal leaching kinetics of primary titanium-rich material by microwave heating was investigated, and the temperature-pressure curves of leaching system and microwave absorption

microwave pretreatment of a double refractory gold ore

Sep 01, 2007 · For both conventional and indirect microwave roasting, gold recoveries of over about 98% were achieved after cyanide leaching. For microwave roasting, both the total carbon removal rates and the heating rates were higher and the specific energy consumptions were lower than the corresponding values for conventional roasting

study onmicrowavepretreatment of refractory

The cyanide leaching rate of gold was 92.03% by microwave roasting with roasting time of 15 min and roasting temperature at 480°C; and the cyanide leaching rate was 86.63% by conventional

(pdf) recovery ofgoldfrom the refractorygold

The recovery rate of gold in the leach residue was improved with microwave-assisted leaching, with a gold recovery of ~132.55 g/t after 20 min of the leaching experiment (2.0 M nitric acid),

microwave heating applications in mineral processing

Dec 10, 2011 · Generally, refractory gold concentrate or ore is pretreated by roasting, O 2-pressure leaching or bacterial leaching, to render it amenable to gold recovery by alkaline cyanide leaching (Haque, 1987a, b)51, 52. Because microwaves in general heat sulphidic minerals easily, it should be possible to pretreat sulphidic refractory gold concentrate by microwave energy

microwave-assisted leaching-a review[j] | request pdf

The recovery rate of gold in the leach residue was improved with microwave-assisted leaching, with a gold recovery of ~132.55 g/t after 20 min of the leaching experiment (2.0 M nitric acid

recovery ofgoldfrom sulfide refractorygold ore

Apr 01, 2021 · Sulfide gold ores account for a large proportion of refractory gold ores, therefore, it is very meaningful to recover gold from sulfide gold ores (Ubaldini and Vegliò, 2000, Saba, 2011, Hammerschmidt, 2016). Moreover, the major gold leaching process for extracting gold from ores and concentrates is still cyanide leaching

pretreatment process on refractorygold oreswith as

Kyuesi and Haque, etc. have studied the role of microwave in the gold extraction process of arsenic-bearing refractory gold ore. 8, 9) Haque K E used microwave to dispose of arsenical pyrite and gold concentrate with pyrite, the gold leaching rate reached 98%

pretreatment of arsenic-bearing gold orewithmicrowave

Jun 01, 2016 · Abstract In this paper, the removal of arsenic from arsenic-bearing gold ore through air oxidation and sodium hydroxide leaching with microwave irradiation was studied. Firstly, single-factor experiments were carried out

effect of sodium carbonate on alkaline self-leachingof

In this paper, the removal of arsenic from arsenic-bearing gold ore by air oxidation and sodium hydroxide leaching with the microwave irradiation was studied. Firstly, single factor experiments

leaching of nickel laterite ore assisted by microwave

In this paper, the removal of arsenic from arsenic-bearing gold ore by air oxidation and sodium hydroxide leaching with the microwave irradiation was studied. Firstly, single factor experiments

microwave assisted atmospheric acid leachingof nickel

May 21, 2010 · Kinetic experiments showed that the leaching of nickel in a sulphuric acid medium was controlled by chemical reaction occurring on the surface of laterite ore. The apparent activation energy was 38.9 kJ/mol. Microwave heating technology is efficient, clean, and easy to control and facilitate continuous processing of materials

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