scholarly journals Effect of hydrogen peroxide and lead(II) nitrate on gold cyanide leaching of Malaysian mesothermal deposit gold ore

2020 ◽  
Vol 56 (5) ◽  
pp. 905-918
Author(s):  
Norlia Baharun ◽  
Ong Pek Ling ◽  
Mohammad Rezaei Ardani ◽  
Kamar Shah Ariffin ◽  
Ali Yaraghi ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Gold Cyanide ◽  
Cyanide Leaching ◽  
Gold Ore

Research on the Gold Ore Leaching in Iodine-Iodide System

2013 ◽  
Vol 634-638 ◽  
pp. 3227-3233
Author(s):  
Xian Ping Luo ◽  
Min Hu ◽  
Chang Li Liang ◽  
Qing Hai Ge
Keyword(s):  
Chemical Reactions ◽  
Thermodynamic Data ◽  
Influence Factors ◽  
Promising Method ◽  
Cyanide Leaching ◽  
Gold Ore ◽  
Leaching Experiments

Iodine-iodide leaching gold ore is a promising method alternative to cyanide leaching. In this paper, Eh—pH diagram of Au-I--I2-H2O system was established through calculating the equilibrium potentials of the main chemical reactions based on the thermodynamic data of the actual iodide leaching of gold system. Gold ore leaching experiments in iodine-iodide system under different influence factors were carried out to verify the effectiveness of the Eh-pH diagram. The results indicated the diagram of Eh-pH can effectively guide the actual gold ore leaching in iodine-iodide system.

Microwave-Assisted Grinding of Bolkardag (Nigde, Turkey) Gold Ore and Enhanced Cyanide Leachability

2018 ◽  
Vol 115 (5) ◽  
pp. 508 ◽  
Author(s):  
Cemaliye Seflek ◽  
Oktay Bayat
Keyword(s):  
Particle Size ◽  
Power Level ◽  
Microwave Treatment ◽  
Cyanide Leaching ◽  
Gold Ore ◽  
Work Index ◽  
Significant Difference ◽  
Bond Work Index ◽  
Pre Treatment ◽  
Silver Extraction

This experimental work aims at studying the effect of particle size on the microwave pre-treatment for the grindability of Bolkardag (Nigde, Turkey) gold ore for cyanide leaching. Three different particle size batches (−8 + 4.7 mm, −4.75 + 2 mm and −2 + 1 mm) were used for microwave treatment. Each sub-samples were exposed to four different power levels of microwave energy (0.09, 0.18, 0.36 and 0.6 kW) at exposure times of 5, 10, 15 and 30 minutes and then grindability characteristic of the treated samples were investigated with Berry and Bruce comparative grindability method. It was clearly seen that increasing power level and exposure time caused a reduction in comparative Bond Work index. A maximum reduction in Bond Work index (73.54%) was achieved by 0.6 kW at 30 minutes of microwave treatment. Compared to the untreated sample’s results, gold and silver extraction rates increased, using microwave-treated samples, about 7% and 9% after 77 hours cyanide leaching, respectively. Additionally, the hydrated lime added samples (after 0.6 kW at 30 minutes of microwave treatment) were used in the cyanide leaching tests to determine the possible effect. It was observed that there was no significant difference on leaching extraction rates using lime free or lime added samples. Applying microwave pre-treatment before cyanide leaching, the gold and silver extraction rates could be increased and also the cost of communition could be reduced due to easier breakage of the ore due to a significant decrease in Bond Work index.

Beyond the Mother Lode

2018 ◽  
Vol 95 (1) ◽  
pp. 2-24
Author(s):  
Adam M. Romero
Keyword(s):  
Economic History ◽  
Gold Mining ◽  
Gold Rush ◽  
Cyanide Leaching ◽  
Gold Ore ◽  
Critical Node ◽  
Chemically Induced ◽  
Mother Lode

This article narrates California's chemically induced second gold rush through the lens of synthetic cyanide. In coupling California's geological, environmental, and economic history to the changing nature of gold ore in the late 1880s, it explores the role that the development of cyanide leaching and the industrialization of cyanide production had on California's mining landscapes. As such, it places California as a critical node in the globalization of cyanide leaching techniques. In doing so, it links disparate geographies and histories together to explore the chemicalization of California gold mining.

scholarly journals INVESTIGATION OF THE AMENABILITY OF A COPPER-RICH REFRACTORY GOLD ORE TO CYANIDE LEACHING

2020 ◽  
pp. 225-234
Author(s):  
Deus Albert MSUMANGE ◽  
Ersin Yener YAZICI ◽  
Oktay CELEP ◽  
Hacı DEVECİ
Keyword(s):  
Cyanide Leaching ◽  
Gold Ore ◽  
Refractory Gold

scholarly journals Ore treatment hydrogen peroxide during heap leaching of gold

2021 ◽  
Vol 316 (1) ◽  
pp. 5-14
Author(s):  
Ye. K. Yessengarayev ◽  
◽  
B. N. Surimbayev ◽  
B. S. Baimbetov ◽  
S. V. Mamyachenkov ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Heap Leaching ◽  
Past Century ◽  
Laboratory Studies ◽  
Sulfide Sulfur ◽  
Cyanide Leaching ◽  
Column Tests ◽  
The Past ◽  
Ore Treatment ◽  
Gold Bearing

Over the past century, many problems have been focused on the problems of low leaching rate of gold and methods have been developed to intensify the leaching of gold. Among these methods, the use of hydrogen peroxide to accelerate the leaching of gold is known. In order to intensify the leaching process, the indicators of cyanide leaching of gold from ore using hydrogen peroxide were studied. This article presents the results of assay-gravimetric, chemical, and mineralogical analyses of gold-bearing ore from the Sari Gunay Deposit (Iran). The content of sulfide sulfur ore belongs to the category of low-sulphide, by oxidation of sulphur (50.70%) to the category of oxidized ores. Thermodynamic analysis of possible reactions of ore components with hydrogen peroxide is carried out. Laboratory studies on cyanide leaching of gold have shown that the maximum recovery of gold is 52.92% at a concentration of hydrogen peroxide of 0.5%, the recovery of gold without ore treatment is 52.03%. The results of laboratory and column tests with and without treatment with hydrogen peroxide (H2O2–0.5%) were compared. Treatment of gold-bearing ore with hydrogen peroxide during heap leaching of gold increases gold recovery by 1.2% and amounts to 55.89%, without treatment - 54.69%. This increases the consumption of sodium cyanide by 0.04 kg/t.

scholarly journals Intensification Behavior of Mercury Ions on Gold Cyanide Leaching

Metals ◽  
2018 ◽  
Vol 8 (1) ◽  
pp. 80 ◽  
Author(s):  
Qiang Zhong ◽  
Yongbin Yang ◽  
Lijuan Chen ◽  
Qian Li ◽  
Bin Xu ◽  
...  
Keyword(s):  
Mercury Ions ◽  
Gold Cyanide ◽  
Cyanide Leaching

Fundamental Kinetic Models for Gold Ore Cyanide Leaching

1996 ◽  
Vol 35 (4) ◽  
pp. 353-361 ◽  
Author(s):  
D. H. Rubisov ◽  
V. G. Papangelakis ◽  
P. D. Kondos
Keyword(s):  
Kinetic Models ◽  
Cyanide Leaching ◽  
Gold Ore

scholarly journals CIL Gold Loss Characterization within Oxidized Leach Tails: Creating a Synergistic Approach between Mineralogical Characterization, Diagnostic Leach Tests, and Preg-Robbing Tests

Minerals ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 557 ◽  
Author(s):  
Mohamed Edahbi ◽  
Raphaël Mermillod-Blondin ◽  
Benoît Plante ◽  
Mostafa Benzaazoua
Keyword(s):  
Mineralogical Composition ◽  
Carbonaceous Matter ◽  
Gold Cyanide ◽  
Cyanide Leaching ◽  
Native Form ◽  
Mineralogical Characterization ◽  
Sulphide Minerals ◽  
Refractory Gold ◽  
Synergistic Approach ◽  
Final Residue

A double refractory gold ore contains gold particles locked in sulphides, solid-solution in arsenopyrite, and preg-robbing material such as carbonaceous matter, and so on. The diagnostic leach test (DLT) and preg-robbing (PR) approaches are widely used to investigate the occurrence and the distribution of refractory gold. DLT serves to qualitatively evaluate the gold occurrences within the ore. Preg-robbing, or the ore’s capacity to fix dissolved gold, is evaluated to determine physical surface interactions (preg-borrowing) and chemical interactions (preg-robbing). The objective of this project is to characterize the refractory gold in Agnico Eagle Mine’s Kittilä ore using the DLT and PRT approaches coupled with mineralogical analyses to confirm testing. The studied material was sampled from the metallurgical circuit following carbon in leach (CIL) treatment at the outlet of the autoclave in order to investigate the effect of the autoclave treatment on the occurrence and distribution of gold. Different reagents were used in the DLT procedure: sodium carbonate (Na2CO3), sodium hydroxide (NaOH), hydrochloric acid (HCl), and nitric acid (HNO3). The final residue was roasted at a temperature of around 900 °C. These reagents were selected based on the mineralogical composition of the studied samples. After each leaching test/roasting, cyanide leaching with activated carbon was required to recover gold cyanide. The results show that gold is present in two forms (native and/or refractory): to a small extent in its native form and in its refractory form as association with sulfide minerals (i.e., arsenopyrite and pyrite) and autoclave secondary minerals that have been produced during the oxidation and neutralization processes such as iron oxides, iron sulfates, and calcium sulfate (i.e., hematite and jarosite), along with carbonaceous matter. The results of DLT indicate that 25–35% of the gold in the tails is nonrecoverable, as it is locked in silicates, and 20–40% is autoclave products. A regrind can help to mitigate the gold losses by liberating the Au-bearing sulphide minerals encapsulated within silicates.

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