In this research, cyanide and chloride–hypochlorite leaching of gold from a pyritic concentrate (particle size: −75+53 µm, gold content: g/t) were compared. It was shown that only % of gold was extracted after 24 h leaching by cyanide, as compared to % after 8 h by chloride–hypochlorite. Effect of ultra–fine milling of the concentrate on the leaching was investigated ...
Ferric chloride leaching of gold resulted in higher redox potentials, OCPs, and dissolution rates than cupric chloride leaching. It was found that the redox potential could be used to estimate the gold dissolution rate, since it had a positive linear correlation with the logarithm of the gold dissolution rate.
Nov 01, 2018 · Chloridebromide leaching is one of the widely investigated alternative lixiviants for gold recovery. However, gold is known to adsorb or precipitate readily on the carbonaceous matter present in the ore, being one of the challenges in chloride process development.
Feb 16, 2015 · Gold Leaching from a Refractory Gold Concentrate by the Method of Liquid Chlorination. Chao Li, Beijing Key Lab of Green Recycling and Extraction of Metals, University of Science and Technology, 30# Xueyuan Road, Beijing, 100083,China.
An alternative method of amalgamation to extract gold in smallscale industries was investigated by means of chlorideionbased solution leaching. In this study, the addition of NaCl and optimization of chlorideionbased leaching of gold was analyzed by using the Taguchi Method. Indonesia gold ore processed from artisanal mining was utilized in this study.
Leaching dissolves the gold out of the ore using a chemical solvent. The most common solvent is cyanide, which must be combined with oxygen in a process known as carboninpulp. As the cyanide and oxygen react chemically, gold in the pulp dissolves.
Abstract An oxide gold ore was subjected to chloride/hypochlorite leaching at room temperature. The effects of three factors, including Ca(OCl)2 vs. NaOCl, OCl− concentration, and HCl concentration on gold leaching performance were investigated. Due to formation of CaOCl+ complex in solution and hence less reactivity, calcium hypochlorite produces a sluggish gold leaching kinetics, taking ...
A process of leaching gold comprising the steps of: a) leaching copper from copper sulfide ore material that contains gold or contains silie ore containing gold until the copper grade is reduced to wt % or less; b) mixing the resulting material having a copper grade of wt % or less with a gold leaching solution selected from the group consisting of a first solution containing ...
![[PDF] Appliion of alternative lixiviants for secondary ...](/2cx5e1n/423.jpg)
Some preliminary results on the secondary leaching of previously heap leached gold ore are presented. Alternative lixiviants for gold comprising chlorine, thiourea and thiosulphate were compared with cyanide using bottle roll tests. Chlorine was subsequently selected for column leaching tests. Column tests at, and gL1 Cl2 at pH 2 were conducted.
Feb 16, 2015 · Gold Leaching from a Refractory Gold Concentrate by the Method of Liquid Chlorination. Chao Li, Beijing Key Lab of Green Recycling and Extraction of Metals, University of Science and Technology, 30# Xueyuan Road, Beijing, 100083,China.
Oct 13, 2021 · Traditionally, once gold ore is mined from the ground, it''s crushed to a powder and passed through a series of tanks in a process called leaching. Cyanide is then used to separate the gold from the ore into the leached solution. With the new process, the leaching and recovery process is done with chloride, one of two elements in table salt.
All the leaching metal of gold leaching tailings treated by Na 2 S 2 O 5 and H 2 O 2 can meet the backfilling requirements ( mg/L) of TSPC. Considering fully with effectiveness and practicability, the best conditions for decomposition of cyanide from leach tailings are first treated in g/L Na 2 S 2 O 5 at pH 10 for 3 hours and then 2 mL ...
Apr 08, 2013 · A process for the extraction of gold from a goldbearing ore or concentrate, comprising the steps of leaching the goldbearing ore or concentrate with a lixiviant of hydrochloric acid and magnesium chloride at atmospheric pressure at a temperature of at least 90° C. and an Eh of at least 900 mV. After a liquid/solids separation step, the solution obtained is subjected to an organic solvent ...
During the roasting of gold concentrate to improve gold recovery, arsenic is released into the air and valuable elements such as Fe, Cu, Zn, and Pb are converted into oxide minerals. In this research, we evaluated the release of As and the loss of valuable metals during the acid baking and hot water leaching processes used for gold concentrate. The acid bake tests were conducted for gold ...
May 04, 2019 · CIL gold leaching process mainly include : Impurity removal, condense before leaching, leaching and adsorption, desorption and electrowinning, hydrometallurgy, regeneration of activated carbon, Tailings treatment, used water treatement, etc . removal: remove the impurity like the grass rootsawdust before cyanide leaching ...
Oxidative chloride, sulfide, and ammonialeaching processes are generally more applicable for the extraction of gold or platinum group metals as a byproduct from base metal sulfide concentrates. Despite the research interest and pilot plant trials on many of the noncyanide gold lixiviants, the majority are still at the development stage.
Oct 06, 2021 · Traditionally, once gold ore is mined from the ground, it''s crushed to a powder and passed through a series of tanks in a process called leaching. Cyanide is then used to separate the gold from the ore into the leached solution. With the new process, the leaching and recovery process is done with chloride, one of two elements in table salt.
