By comparing the dissolution of silver sulfide in the cop Sect. C, 1983, 92 (4): 216. perthiosulfate solution with and without ammonia, it is ob [8] Jeffery, Kinetic aspects of gold and silver leaching in served that the presence of ammonia significantly decreased ammonia thiosulfate solutions, Hydrometallurgy, 2001, 60 (1): the silver extraction ratio. Silver sulfide can be dissolved ...
One promising alternative to cyanide for the leaching of gold is thiosulfate due to its low toxicity and efficiency in leaching gold from lowgrade and carbonaceous ores and concentrates. Much of the published research focuses to optimizing the reagent concentrations to develop a suitable process for industrial appliions. However, there are few studies on the effect of silver content on ...
such as silver nitrate, and sodium salts of nitrate, carbonate, sulfite, sulfate, ... Complexity of gold leaching process with thiosulfate 9 The use of gold colloids for kinetic studies 11 Objectives 14 Chapter 2 Literature review 15 History and recent progress on gold extraction using thiosulfate 15 Goldcoppersulfur species and electrode potentials 17 Goldcopper ...
· Thiosulfate leaching is a process that recovers gold from ore without the use of cyanide. Jacob Jason Demedici developed the thiosulfate leaching process because in .
The beneficial effect of silver in gold leaching by oxygen in alkaline cyanide and thiosulfate media has been reported by previous researchers. This paper describes a preliminary study of a similar effect in thiosulfate leaching of gold by ammoniacal copper(II) at ambient temperature. Silver dissolves faster than gold in ammoniacal copper(II) thiosulfate solutions.
· In the second stage, leaching of gold and silver values with ammonium thiosulfate was performed, and this yielded a removal of % silver and gold % with a liquid–solid ratio of 2:1. Thiosulfate consumption was g/L, which is economically affordable for this head ore with gold and silver content of g/ton and 310 g/ton, respectively.
leaching gold and silver, easy to get and manipulate. This work is done in the Technological Institute of Parral in a lowgrade ore from the southern region of the state of Chihuahua. This document has been enriched presented in the IMEC 2014, with the increase of series V and VI. Key words: Leaching, cyanide, ammonium thiosulfate. 1. Introduction
thiosulfate (S 2O 3 2 –) are created along with sulfide. This is illustrated simplistically in the following scenario. ... The gold/silver alloy was prepared by the same procedure, with the exception that silver nitrate was added to the solution resulting in a deposit containing approximately 5% silver by mass (which for simplicity will be referred to as gold/silver). In one experiment ...
· Nitritecopper is a totally new and promising silver leaching system. • NO 2 –Cu 2 + system is capable of complexing silver metal without thiosulfate.. Nitrite ions act as a complexing as well as oxidizing agent. • Leaching is controlled by chemical reaction of lixiviant at the Ag surface.
· Thiosulfate system is considered an interesting alternative leaching process for precious metals. Nevertheless, most of the literature published on these conventional thiosulfate leaching solutions has been focused on the use of ammonia and copper to generate the cupric tetraamine complex, which acts as a alytic oxidant for silver.
· Thiosulfate–nitrite–copper is a promising silver leaching alternative system. Cupric–ammonia complexes are produced insitu without the addition of ammonia in the system. Antlerite and copper hydroxide are produced on the silver particle. Sulfite decreases the oxidative ability of the system and the silver leaching kinetics.
THIOSULPHATE LEACHING – AN ALTERNATIVE TO CYANIDATION IN GOLD PROCESSING ALTERNATIVES TO CYANIDE IN GOLD PROCESSING THIOSULPHATE LEACHING Thiosulphate leaching is a process that removes gold from gold bearing ores without the use of cyanide. Although not as aggressive a leaching agent as cyanide, thiosulphate offers several technological advantages .
leaching gold and silver, easy to get and manipulate. This work is done in the Technological Institute of Parral in a lowgrade ore from the southern region of the state of Chihuahua. This document has been enriched presented in the IMEC 2014, with the increase of series V and VI. Key words: Leaching, cyanide, ammonium thiosulfate. 1. Introduction The mining industry in the extraction of gold ...
In 1932 Geiger 1 began to use methylene blue in treatment of cyanide poisoning. The antidotal action of the dye was shown by Wendel 2 and Hug 3 to be due to the formation of methemoglobin, which successfully competes with the respiratory enzyme, ferricytochrome oxidase, for cyanide ions. Subsequent reports 4 indie that methylene blue is not an efficient antidote because it is a poor ...
The leaching of silver sulfide with the thiosulfate–ammonia–cupric ion system. Hydrometallurgy 1998, 50, 243–260. [Google Scholar] AlvaradoMacías, G.; FuentesAceituno, ; NavaAlonso, F. Study of silver leaching with the thiosulfatenitritecopper alternative system: Effect of thiosulfate concentration and leaching temperature.
gold and silver from residues of the amoniacal oxidation leaching of sulphidic copper concentrates. Extractions of 88 95% Au and 83 98% Ag were attained within 2 to 4 hours at 40 60°C in thiosulphate leaching of the oxidation leach residues of Manitoba chalcopyrite concentrates analyzing .
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