Recovery of vanadium and molybdenum from spent ...

Under microwave-assisted conditions (600 W, 10 min, 90℃, 2.0 mol·L -1 NaOH, and 0.20 g·mL -1 solid-liquid ratio), the leaching efficiencies of V and Mo reached 94.35% and 96.23%, respectively. It has been confirmed that microwave energy has considerable potential to enhance the efficiency of the leaching process and reduce the leaching time.

Hydrometallurgy 2021-2022- & …

Improving gold recovery from a refractory ore via Na2SO4 assisted roasting and alkaline Na2S leaching: Xiaoliang Liu · Xiaoliang Liu · Qian Li · Zhang Yan · Zhang Yan · Tao Jiang · Yongbin Yang · Bin Xu · Yinghe He: Recovery of lithium in seawater using a titanium intercalated lithium manganese oxide composite

Review Pretreatment Process on Refractory Gold Ores with As

refractory gold ore.8,9) Haque K E used microwave to dis-pose of arsenical pyrite and gold concentrate with pyrite, the gold leaching rate reached 98%.10) Liu Quanjun etc. made a test for a gold mine in Guizhou province. The ore without micro-wave pretreatment could be hardly leached in cya-nide. On the other hand the cyanide leaching of gold ore

improved grindability and gold liberation by microwave

Microwave-assisted leaching experiments for gold recovery were conducted for the refractory gold concentrate. More extreme reaction conditions (nitric acid concentration > 1.0 M) facilitated the decomposition of passivation species derived from metal ion dissolution and the liberation of gangue minerals on the sulfide surface.

Microwave energy for mineral treatment processes—a brief ...

This review is a brief account of R&D results generated from microwave-assisted mineral treatments tests. The R&D results demonstrate that microwave energy has potential in mineral treatment and metal recovery operations such as heating, drying, carbothermic reduction of oxide minerals, leaching, roasting/smelting, pretreatment of refractory gold ore and concentrate, …

Leaching of Refractory Gold Ores by Microwave Irradiation ...

The present paper attempts to assess the effects of microwave irradiation on the leachability of refractory gold ores. Characteristics of the crystal structure and microstructure of the ores were determined by x-ray structural analysis (XRD) and scanning electron microscopy (SEM) before and after microwave irradiation. Compared to conventional processes, …

US5824133A - Microwave treatment of metal bearing ores and ...

US5824133A US08/614,352 US61435296A US5824133A US 5824133 A US5824133 A US 5824133A US 61435296 A US61435296 A US 61435296A US 5824133 A US5824133 A US 5824133A Authority US United States Prior art keywords cavity ore concentrate microwave energy Prior art date Legal status (The legal status is an assumption and is not a …

Pore Evolution in Refractory Gold Ore Formed by Oxidation ...

Refractory gold ore is usually affected by the associated carbonaceous matter through the preg-robbing effect, which is eliminated by oxidation roasting, followed by leaching, to achieve a satisfactory gold leaching efficiency. Roasting–leaching experiments, pore structure measurements, scanning electron microscopy (SEM), and X-ray diffraction are used to explore …

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Recovery of gold from refractory gold ores: Effect of pyrite on the stability of the thiourea leaching system 1 Hong Qin Xue-yi Guo +1 Lei Zhang 《:》 SCIE EI CAS CSCD 20216956-964,9

Minerals | Free Full-Text | Methods of Ore Pretreatment ...

The microwave pretreatment results showed positive improvements at pilot scale mining applications in 2017. The results of ore pretreatment using electric and ultrasonic methods showed up to 24% and 66% improvement in energy consumption, respectively. The former and the latter have been piloted for gold and carbonate ore, respectively.

Microwave pretreatment of a double refractory gold ore ...

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 ores.

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[13] BADRI R, ZAMANKHAN P. Sulphidic refractory gold ore pre-treatment by selective and bulk flotation methods[J]. Advanced Powder Technology, 2013, 24(2): 512-519. [14] ESPITIA S L M, LAPIDUS G T. Pretreatment of a refractory arsenopyritic gold ore using hydroxyl ion[J]. Hydrometallurgy, 2015, 153: 106-113.

Recovery of gold from the refractory gold concentrate ...

Microwave-assisted leaching experiments for gold recovery were conducted for the refractory gold concentrate. More extreme reaction conditions (nitric acid concentration > 1.0 M) facilitated the decomposition of passivation species derived from metal ion dissolution and the liberation of gangue minerals on the sulfide surface.

Iron ore grindability improvement by microwave pre-treatment

Pre-treatment in a microwave oven with maximum microwave radiation-proof oven cooker window (to visualize the power of 900 W of weakly paramagnetic ore (25.1% Fe, 9.6% SiO2) sample during treatment), stirrer fan cover (plastic shield to cover was realized with the samples (100 g) of iron spathic ore of particle the stirrer fan, which operates ...

(PDF) Microwave-assisted leaching—a review | Mohammad Al ...

It was indicated that microwave energy The main types of dielectric polarization are (Metaxas could have a potential application in comminution, and Meredith, 1983): drying, pre-treatment of refractory gold ores, coal desulphurisation, leaching, roasting, carbon reactiva- electron polarization due to the change of electron tion, carbothermic ...

Synthetic Ore Samples to Test Microwave/RF Applicators and ...

leaching, roasting, smelting, pretreatment of refractory gold ore and concentrate, spent carbon regeneration and waste management. A similar review was done by Jones et al. (2002). Both papers concluded that challenges for microwave-assisted mineral treatments remain to …

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Abstract: It is difficult to enrich the gold by conventional method for some refractory gold ore, hence, pretreatment is an effective way to improve the gold leaching ratio.In this paper, problems existing in treating gold ore were briefly analyzed, and the present situation and progress of some pretreatment methods were introduced.

Separation and Purification Technology - lu.ac.ir

drying and an-hydration, microwave-assisted mineral leaching, microwave-assisted roasting and smelting of sulfide concentrate, microwave-assisted pretreatment of refractory gold concentrate, microwave-assisted spent carbon regeneration and microwave-assisted waste management [3]. Inthecomminutionprocess,microwavepretreatedoresshowa

Microwave-assisted acid pretreatment for enhancing ...

The microwave-assisted pretreatment was therefore considered as one of the emerging pretreatment technologies, even though feasibility studies are still needed to evaluate the viability of using microwave technology in a commercial biorefinery . Combinations of solvent and catalyst are important for pretreatment.

WEI LI CARBOTHERMIC REDUCTION KINETICS OF ILMENITE ...

assisted mineral leaching, microwave assisted roast-ing and smelting of sulphide concentrate, microwave assisted pretreatment of refractory gold concentrate, microwave assisted spent carbon regeneration, coke making and activated carbon production, and micro-wave assisted waste management, etc. [22-31]. For microwave processing of ilmenite ...

Optimizing the alkaline oxidation pretreatment of a ...

Sodium hydroxide was used for pretreatment of the refractory gold–silver ore from the Akoluk deposit. The alkaline pretreatment process significantly improved the gold recovery from 49.3% to 85.4%. Hasab et al : Combining sulfide oxidation and gold leaching using chloride/hypochlorite solution

UMaT - Staff Web Directory

Ofori-Sarpong, G, Osseo-Asare K., and Tien, M. (2011), "Fungal pretreatment of sulfides in refractory gold ores", Minerals Engineering, 24 0, 499-504 Amankwah, R K and Ofori-Sarpong, G (2011), "Microwave heating of gold ores for enhanced grindability and cyanide amenability", Minerals Engineering, 24 6, 541-544

IMPROVED ROASTING OF SOME COLOMBIAN GOLD ORES

Thus, it is a refractory gold ore, due to the effect of the latter, so roasting is a good approach for increasing its recovery. Table 5 shows the mineral composition for the microwave roasted sample. It can be seen that all the pyrite, and most of the lesser compounds, are gone, generating hematite and some non-crystalline phases, instead.

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.

: ;;;; Abstract: In order to reveal the damage law of metagranulite under microwave radiation, the microwave radiation experiments were carried out on metagranulite of gold-bearing ore body from Danyin Mining Co., Ltd..The results show that the localized high-temperature melting zone is an iron-rich zone,where a large ...

Concentrate Using Microwave Assisted Leaching

2.2.2. Microwave-Assisted Leaching: Recovery of Gold Microwave-assisted leaching was performed by heating a 500 mL Pyrex glass containing 200 mL of nitric acid (1.0, 3.0, and 5.0 M) and 20 g of the refractory gold concentrate. Figure1shows the schematic of the laboratory-scale microwave-assisted leaching developed in this study. The flask was