Processing Gold Quarry refractory ores

JOM ◽  
1989 ◽  
Vol 41 (4) ◽  
pp. 43-45 ◽  
Author(s):  
D. M. Hausen
Keyword(s):  
Refractory Ores ◽  
Gold Quarry

Color and Casta in the Andean Silver Industry

2020 ◽  
pp. 259-293
Author(s):  
Allison Margaret Bigelow
Keyword(s):  
Latin America ◽  
Seventeenth Century ◽  
Colonial Latin America ◽  
Traditional Methods ◽  
Refractory Ores ◽  
Shed Light

Amalgamation technologies allowed refiners throughout colonial Latin America to profitably extract silver from a wider variety of metals, including even the most refractory ores. These expanded processing capabilities meant that mineral classification and sorting became even more important, as metallurgists had to identify which silver metals to treat with traditional methods and which ones to refine by amalgamation. The vocabularies used to classify metals provide critical evidence of Indigenous contributions to silver refining in the seventeenth century. By tracing the incorporation and removal of Andean color and spatial vocabularies, this chapter shows how scientific writers and translators replaced Indigenous classifications of matter with a racialized language of metallic “castas” that included “pacos,” “mulatos,” and “negrillos.” The chapter concludes by suggesting how a reading of color signatures in khipus might shed light on Andean miners’ experiences in ways that traditional historiographic methods have not yet allowed.

Thiocarbamide Leaching of Gold and Silver from Refractory Ores and Concentrates

1995 ◽  
Vol 15 (1-4) ◽  
pp. 137-137 ◽  
Author(s):  
V. V. LODEITSHIKOV ◽  
A. F. PANTCHENKO ◽  
O. D. KHMELNITSKAYA ◽  
V. Y. BYVALTSEV
Keyword(s):  
Refractory Ores

scholarly journals Clustering of protons as the main factor in increasing the activity of leaching solutions at their electrochemical and photochemical processing

2020 ◽  
Vol 192 ◽  
pp. 02014
Author(s):  
Arthur Sekisov ◽  
Anna Rasskazova
Keyword(s):  
Aqueous Solutions ◽  
Uv Light ◽  
Theoretical Substantiation ◽  
Highly Active ◽  
Refractory Ores ◽  
Photochemical Processing ◽  
Water Gas ◽  
Dispersed Gold ◽  
Main Factor ◽  
Electron Interactions

The theoretical substantiation for the proton clustering process during electrochemical and photochemical processing of technological solutions is provided in the paper. This process provides a significant increase in the efficiency of leaching of gold from refractory ores. It was proposed that the chemical processes in aqueous solutions occur not only due to electronic (interelectronic) interactions, but also as a result of proton-electron interactions. The hypothesis is substantiated. Proton-electron interactions play an important role in the destruction and formation of chemical bonds between the solvent and the solute, as well as between dissolved substances. Compounds with a polymer-like structure can be formed during the electrolysis of aqueous solutions of different reagents, containing oxygen dimers (O-O). Hydrated cluster shell of active water molecules is formed around these polymer-like compounds. A metastable region of clustered protons is formed. Water-gas emulsion is formed during electrolysis and irradiatin with UV light. Highly active oxidants such as atomic oxygen, superoxide radical ion, ozone, and hydroxyl radical are synthesized in the gas bubbles. These compounds intensify protonation processes during hydration. The results of experiments on column activation leaching of dispersed gold from large-volume sample of refractory ore from the Pogromnoye deposit prove the validity of the theoretical substantiations.

scholarly journals Preg-robbing of Gold by Carbonaceous Materials Encountered in Gold Processing

2017 ◽  
Vol 17 (2) ◽  
pp. 50-55
Author(s):  
F. Amanya ◽  
G. Ofori-Sarpong ◽  
V. Anni ◽  
R. K. Amankwah
Keyword(s):  
Activated Carbon ◽  
Wood Chips ◽  
Carbonaceous Materials ◽  
Gold Ores ◽  
Gold Processing ◽  
Treatment Processes ◽  
Adsorption Capacities ◽  
Increasing Trend ◽  
Refractory Ores ◽  
Pre Treatment

Processing of gold from refractory ores containing carbonaceous materials (CM) poses challenges due to the ability of the CM to preg-rob dissolved gold. Depending on the type and maturity of CM encountered, preg-robbing of aurocyanide ion can lead to reduction in gold recovery ranging from a few percentages to more than 50%. Knowledge on the type of CM present, and its capacity for gold adsorption is important in predicting pre-treatment methods that can deactivate the CM and reduce its ability to preg-rob. This paper, as part of an on-going work, presents results on the degree of adsorption by the various carbonaceous materials encountered in gold processing, and estimates the amount of aurocyanide complex preg-robbed by them. To do this, various weights of carbonaceous materials (wood chips, charcoal, barren carbon and fresh activated carbon) were contacted with gold solution for a given period of time. The percentages of gold adsorbed on the various carbons were determined, and the results showed an increasing trend of preg-robbing in favour of wood chips < charcoal < barren carbon < activated carbon. Of all the CMs, wood chips have not undergone any carbonisation and/or activation, and thus exhibited the lowest affinity. The adsorption capacities in grams of gold per tonne of carbon over a 24-hr period were 30-65 for wood chips, 320-370 for charcoal, 410-420 for barren carbon and 580-650 for activated carbon. The trend shows direct correlation with the activities and the degrees of graphitisation and maturity of the various carbonaceous materials. It is thus important to characterise carbonaceous gold ores to know the maturity of the CM present, which will inform on the pre-treatment processes required. Keywords: Preg-Robbing, Wood Chips, Charcoal, Activated Carbon

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