scholarly journals New Chloride Leaching Process for Gold Extraction from Refractory Ores

Gold Bulletin ◽  
1997 ◽  
Vol 30 (1) ◽  
pp. 20-20 ◽  
Author(s):  
WS Rapson
Keyword(s):  
Gold Extraction ◽  
Leaching Process ◽  
Chloride Leaching ◽  
Refractory Ores

Sandioss, an alternative reactive to NaCN for the Au leaching process by agitation for an oxide type mineral

2018 ◽  
Vol 2 (1) ◽  
pp. 1 ◽  
Author(s):  
Manlio Heras Romero ◽  
Nilton Quispe Ciudad ◽  
Juan Vega Gonzales
Keyword(s):  
Atomic Absorption ◽  
Sodium Cyanide ◽  
Variance Analysis ◽  
Gold Content ◽  
Leaching Tests ◽  
Gold Extraction ◽  
Fire Assay ◽  
Leaching Process ◽  
Mineral Type

The influence of the Sandioss reagent was studied as an alternative for the gold’s leaching by agitation of a mineral-type oxide. The evaluated variables were: the hydrogen potential (pH) with levels 7, 9 and 11, the concentration of Sandioss leach at 250 ppm, 500 ppm and 750 ppm, and the leaching time at 12, 24 and 48 hours. For each concentration of the leaching agent, a test was conducted in parallel with sodium cyanide at a pH = 11 to prevent the volatilization of cyanide. The solutions taken were analyzed by atomic absorption to determine the gold content in solution and tails were analyzed by fire assay. From the result of the leaching tests it can be concluded that for a better gold extraction with the Sandioss leaching, it is obtained at a concentration of 750 ppm of Sandioss, pH of 11 and time of 48 hours, obtained 79.15% extraction. Finally, the variance analysis at a level of 95% confidence shows that the variables studied significantly influence the extraction of gold and is presented as an alternative to the use of NaCN.

scholarly journals Mechano-Activation and SHS of Difficultly Taken Ore

2014 ◽  
Vol 13 (3-4) ◽  
pp. 189
Author(s):  
O. Bayrakova ◽  
O. Golovchenko ◽  
S. Aknazarov
Keyword(s):  
Mechanical Activation ◽  
Chemical Activation ◽  
Leaching Rate ◽  
Optimal Conditions ◽  
Optimum Conditions ◽  
Activation Time ◽  
Technological Parameters ◽  
Leaching Process ◽  
Grinding Media ◽  
Refractory Ores

Technological parameters of opening refractory ores by mechanical activation which determine remaining and the morphology of the samples after mechanical activation, SHS synthesis and the leaching process has been defined. Mechano-chemical activation of arsenopirita in different modes increases process have been defined. Optimal conditions for activation: time - 30 min at a ratio of grinding media and mineral 2:1. Leaching rate was higher for the activated samples the same amount of time than the original. Extraction of gold for the chosen optimum conditions is 93.2-95 %.

scholarly journals Evaluation of the inhibition process effect “Preg-robbing” for gold recovery (AU)

Veritas ◽  
2020 ◽  
Vol 21 (1) ◽  
pp. 67
Author(s):  
Gregorio Urbano Palma Figueroa ◽  
Javier Alonso Villegas Aragón ◽  
María del Carmen Camiña Pacheco ◽  
Lilia Mary Miranda Ramos ◽  
Antonio Erick Linares Flores Castro ◽  
...  
Keyword(s):  
Acidic Medium ◽  
Complex Structure ◽  
National Society ◽  
Gold Extraction ◽  
Valuable Metal ◽  
Leaching Process ◽  
Extraction Processes ◽  
Extraction Performance ◽  
Inhibition Process ◽  
Gold Mineral

Currently, the National Society of Mining, Petroleum and Energy (SNMPE) states that in recent years the production of gold in Peru has reduced, since in 2016 there was a production of 153 MT, compared to 2005 with a production of 208 MT. Until 2018, a production decrease of 5.4% was established and in 2017 a decrease of 11.3%. Currently there is a need to develop research on gold extraction processes in low recovery minerals with traditionally used processes, due to the complex structure of gold that prevents their extraction. It is necessary to evaluate new processes that are environmentally friendly and that are sustainable in the environmental and economic aspects. In the present work, the applicability of leaching with NaCl and KNO3 in acid medium in a sulphurous gold mineral was evaluated, through the process of leaching with oxidizing salts, which allows to process hydrometallurgy the various forms of gold minerals present in nature. The sample is composed in percentages by Quartz 24%, Carbonates Dolomite 22%, Calcite 6%, Arsenopyrite 19%, Pyrite 5%, Galena 4% and clays associated with traces of Native Au-Electrum, which were interfering with the process of leaching of the sample. A pretreatment by gravimetric concentration was carried out using the Falcón equipment, with the aim of releasing the encapsulated gold and eliminating the interfering agents, facilitating the leaching action of the oxidizing salts. When testing the concentrations of the oxidizing salts, it was found that for the concentrations of 86.86 g/l of NaCl, 21.96 g/l of KNO3 and 125.93 g/l of H2SO4, a maximum recovery of 26.62% gold was obtained. Based on the results from the factorial design, an increase in gold extraction performance was observed; obtaining a maximum recovery of 29.31% of the gold; in the process it was determined that dissolved gold is affected by the presence of clays, producing the "Preg-robbing" effect of the valuable metal and consequently decreasing the recovery of gold after 8 leaching hours. According to the results, it is concluded that the leaching process with oxidizing salts in acidic medium for the type of mineral used, is mainly affected by the presence of coarse gold and electrum associated with clays, establishingconditions of degree of release according to the granulometry in the gold leaching process.

Improving the gold leaching process of refractory ores using the Jetleach reactor

2019 ◽  
Vol 134 ◽  
pp. 300-308 ◽  
Author(s):  
Jean Jacques Kalombo Mbayo ◽  
Henry Simonsen ◽  
Sehliselo Ndlovu
Keyword(s):  
Gold Leaching ◽  
Leaching Process ◽  
Refractory Ores

scholarly journals Characterization of gold ore from Babakan Loa Sub-District and leaching study in cyanide solution

2021 ◽  
Vol 882 (1) ◽  
pp. 012027
Author(s):  
L O Arham ◽  
F R Mufakhir ◽  
I A Putri ◽  
Wahab ◽  
H Z Hakim ◽  
...  
Keyword(s):  
Grain Size ◽  
Clay Content ◽  
Xrd Analysis ◽  
Cyanide Solution ◽  
Gold Extraction ◽  
Gold Ore ◽  
Leaching Process ◽  
Wet Chemical ◽  
Ore Characterization

Abstract Research on the characterization of gold ore from Babakan Loa sub-district and studies of leaching in cyanide solution has been carried out. This research was conducted to determine the characteristics of gold ore from Babakan Loa and the leaching behavior in cyanide solution. The preparations carried out were crushing and grinding to obtain several size fractions. The ore characterization was carried out through XRD, XRF, SEM-EDX, and wet chemical analysis. XRD analysis results show that the main mineral phases are quartz, hematite, goethite, kaolinite, montmorillonite, and berlinite. The main constituents of the ore were Si (60.96%), Fe (10.71%), K (5.47%), and Al (19.53%). The Au content was 7.8 ppm, and the results of SEM-EDX analysis show that the gold grain size is smaller than 10µm. The leaching process showed that the highest percent gold extraction data of 92.7% was obtained in experiments with 1000 ppm sodium cyanide concentration, 10% solids percent, and 104-149µm grain size. Increasing the percentage of solids and the reduction in grain size led to a decrease in the percentage of gold extraction. The clay content was suspected to be the cause of the ineffectiveness of the leaching process in this study.

scholarly journals Substantiation of the effective geotechnological parameters of activation heap leaching of gold from refractory ores

2020 ◽  
Vol 192 ◽  
pp. 02002
Author(s):  
Anna Rasskazova ◽  
Paul Korpi
Keyword(s):  
Large Scale ◽  
Chemical Activation ◽  
Heap Leaching ◽  
Copper Recovery ◽  
Low Grade ◽  
Hydrometallurgical Processing ◽  
Ore Preparation ◽  
Chloride Leaching ◽  
Refractory Ores ◽  
Study Laboratory

The difficulties associated with the hydrometallurgical processing of refractory ores and some methods of their solution are discussed in the article. Difficulties associated with leaching of goldcopper ores are characterized. Gold and copper content is 0.5 ppm and 0.37 % respectively in the primary ores of the Malmyzh deposit. The ore is characterized as low grade. The geotechnology method of heap leaching is feasible for low grade ores processing. The characteristics of ore material favorable for heap leaching are listed in the paper. The current trends in ore preparation for heap leaching are briefly described. Hydrodynamic parameters of spraying are one of the important aspects influencing the process result. The hydrodynamic regimes implemented in the processes of heap leaching are listed and methods for determining the rational irrigation regime and the method of feeding the solution are given. Technological studies are required for any type of ore to assess the feasibility of heap leaching. Typically, technological studies begin with laboratory stage, then large-scale research are performed and the pilot-plant tests allows assessing the feasibility of the technology on the industrial scale. In this study, laboratory scale column leaching research were carried out. A method of activation chloride leaching with sulfuric acid-peroxide pre-oxidation was developed and tested. The leaching solutions were activated by the method of electro-photo-chemical activation with sequential electrolysis and ultraviolet irradiation. As a result of the experiment, 68-80% copper recovery was achieved.

Sign in / Sign up

Export Citation Format

Share Document