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gold dissolution in alkaline thiourea solution

Reaction mechanism of gold dissolving in alkaline thiourea solution was studied by electrochemical methods such as cyclic voltammetry chronopotentiometry AC impedance linear sweep voltammetry Apparent activation energy of anodic process of gold electrode dissolving in alkaline thiourea solution is 1491 kJmol Rate determining step is the process of gold thiourea complex diffusing away

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Dissolution Behavior of Gold in Alkaline Media Using
Dissolution Behavior of Gold in Alkaline Media Using

dissolution of gold in thiourea solutions is much faster than in cyanide solutions The dissolution of gold in thiourea solutions was reported for the first time in 1941 and it was continued in 1960 It has been reported that gold dissolves 1 more efficiently with thiourea in acid than in alkaline solution Thiourea

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Dissolution Behavior of Gold in Alkaline Media Using Thiourea
Dissolution Behavior of Gold in Alkaline Media Using Thiourea

Therefore sodium sulfite catalyzes the gold dissolution process and stabilizes the thiourea With this study it was possible to establish the feasibility of using thiourea in an alkaline medium for the dissolution of gold and the conditions under which it is possible to dissolve the gold in that medium

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Mining Thickener for Mineral Processing  Low Cost
Mining Thickener for Mineral Processing Low Cost

In this paper fundamentals development and the recent research progresses of gold leaching in alkaline thiourea solution which is the most prospective substitute for dissolving gold in cyanide solution are reviewed The mechanism of gold dissolution is the theoretical foundations for gold leaching in thiourea solution

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Research status and prospect of gold leaching in alkaline
Research status and prospect of gold leaching in alkaline

Sa et al 1984 have studied the dissolution of gold scrap in alkaline thiourea solution Although gold dissolution is only 01 mgcm 2 under the conditions of the concentration of thiourea being 8 Na 2 O 2 being 16 flux of oxygen being 033 dm 3 min for 90 min pH being over 13 and temperature being controlled at 303 K the substrate of

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Gold dissolution in acidic thiourea and thiocyanate
Gold dissolution in acidic thiourea and thiocyanate

The dissolution of gold in acidic thiourea solutions together with the oxidation of thiourea on gold platinum and glassy carbon GC electrodes has been investigated using voltammetric methods

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Thiourea for Extraction of Gold  Silver from Silver Ores
Thiourea for Extraction of Gold Silver from Silver Ores

Leaching Chemistry of Gold Silver and Manganese Thiourea is a reducing and complexing agent and can be used for the processing of gold and silver The redox potential of goldI and silverI thiourea complexes in acidic thiourea solutions are 0380 and 0023 V vs SHE respectively Kazakov et al 1983 Lodeishchikov et al 1975

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gold leaching solution
gold leaching solution

gold leaching solution Gold leaching in cyanide starved copper solutions Mining Gold leaching in cyanide starved copper solutions in the presence of glycine Ores in which gold occurs in chemical composition The most commonly used process for gold extraction with dilute alkaline cyanide solution and air is US4557759A Iodine leach

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The leaching of gold silver and their alloys in alkaline
The leaching of gold silver and their alloys in alkaline

theamounts of dissolved gold in the leaching solution to determinethe activation energy for gold dissolution in glycine solutions Fig 1 shows the effect of temperature on the kinetics of gold leaching It can be seen that there is an induction time of 48 h and after this time the gold dissolution increases dramatically as the temperature

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The Decomposition of Thiourea in Water Solutions  Journal
The Decomposition of Thiourea in Water Solutions Journal

On GoldI Complexes and Anodic Gold Dissolution in Sulfite–Thiourea Solutions Journal of Solution Chemistry 2017 46 4 9891003 DOI 101007s1095301706169 Taking up the Formation of Metal Sulfides from Metal–Thiourea Alkaline Solutions Comments on Inorganic Chemistry 2017 37 2 99115 DOI 1010800260359420161230547

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Leaching GoldSilver Ores With Sodium Cyanide and
Leaching GoldSilver Ores With Sodium Cyanide and

Cyanide extracts gold in an alkaline medium and although no oxidant other than air from agitation is generally applied addition of an oxidant may be beneficial 4 The dissolution of gold by cyanide iy expressed by with gold solubilized as an anionic complex EXPERIMENTAL Thiourea leaching solutions were pre

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Electrochemical Oxidation of Gold and Thiourea in
Electrochemical Oxidation of Gold and Thiourea in

The oxidation of thiourea has also been studied on a gold electrode where the thiourea concentration used was so low that the dissolution of gold was not appreciable1516 At higher thiourea concentrations gold dissolution occurs17 In the work described in this paper the dissolution of gold in acidic thiourea solutions and the oxidation

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Electrochemical kinetics of gold dissolving in alkaline
Electrochemical kinetics of gold dissolving in alkaline

Jun 13 2006 · Read Electrochemical kinetics of gold dissolving in alkaline thiourea solution Journal of Central South University of Technology on DeepDyve the largest online rental service for scholarly research with thousands of academic publications available at your fingertips

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A Method for Leaching or Dissolving Gold from Ores
A Method for Leaching or Dissolving Gold from Ores

A Method for Leaching or Dissolving Gold from Ores or Precious that alkaline solutions of alkalimetal cyanides eg NaCN KCN dissolve 1538 kPa above the solution The dissolution of gold was measured gravimetrically weighing accurately the gold

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STUDY ON SELECTIVE DISSOLUTION OF GOLD IN ALKALINE
STUDY ON SELECTIVE DISSOLUTION OF GOLD IN ALKALINE

Abstract Gold dissolves easily in an alkaline thiourea solution with Na 2 SO 3 and Na 2 S 2 O 8 where the accompanied elements of Au such as Ag Cu Ni and Fe can hardly was considered that electrochemical reduction and catalytic action of SO 3 2prevent thiourea from decomposing irreversibly and accelerates dissolution of S 2 O 8 2as an oxidant can control the

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Mining Thickener for Mineral Processing  Low Cost
Mining Thickener for Mineral Processing Low Cost

In this paper fundamentals development and the recent research progresses of gold leaching in alkaline thiourea solution which is the most prospective substitute for dissolving gold in cyanide solution are reviewed The mechanism of gold dissolution is the theoretical foundations for gold leaching in thiourea solution

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A REVIEW OF GOLD LEACHING IN ACID THIOUREA SOLUTIONS
A REVIEW OF GOLD LEACHING IN ACID THIOUREA SOLUTIONS

No passivation of the gold surface is observed in simple acidic solutions However in actual leaching systems some sulfide minerals significantly catalyze the redox reaction between thiourea and ferric ion causing high thiourea consumption if ferric ion is present in excess

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Electrochemical kinetics of gold dissolving in alkaline
Electrochemical kinetics of gold dissolving in alkaline

Jun 13 2006 · Read Electrochemical kinetics of gold dissolving in alkaline thiourea solution Journal of Central South University of Technology on DeepDyve the largest online rental service for scholarly research with thousands of academic publications available at your fingertips

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DISSOLUTION OF GOLD WITH CYANIDE REPLACING
DISSOLUTION OF GOLD WITH CYANIDE REPLACING

Dissolution of gold in alkaline thiosulfate solution is shown in Eq 2 Reaction 2 is slow unless Cu2 that works as an oxidant catalyses it Eq 3 Feng 2011 Ammonia is also needed to Polarization curves of gold in thiourea solution with pH 10 and 18 and temperatures 25 and 40 ˚C

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Thiourea Gold Leaching  Metallurgist  Mineral Processing
Thiourea Gold Leaching Metallurgist Mineral Processing

The kinetics of thiourea dissolution of gold have been studied extensively Initial interest in thiourea as an extractantcomplexing agent for gold dates back to a 1941 paper by Plaskin and Kozhukhova Interest was renewed by these researchers in 1960 and since then several investigators have studied the goldthiourea system

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Kinetic Investigation and Dissolution Behavior of Cyanide
Kinetic Investigation and Dissolution Behavior of Cyanide

May 10 2019 · Thiourea showed a continuous gold dissolution over time 026 M thiourea 002 M iron sulfate 015 M sulfuric acid The average dissolution rate of thiourea

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Cyanide and Other Lixiviant Leaching Systems for Gold with
Cyanide and Other Lixiviant Leaching Systems for Gold with

Jun 10 2010 · Selection of a leaching system for gold involves consideration of ore texture and mineralogy chemical requirements leaching techniques the development of flowsheets and environmental management Aqueous dissolution chemistry for alkaline neutral and acid systems is mainly considered here All systems require an oxidant to oxidise gold and a ligand to complex with gold in solution

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A Method for Leaching or Dissolving Gold from Ores
A Method for Leaching or Dissolving Gold from Ores

A Method for Leaching or Dissolving Gold from Ores or Precious that alkaline solutions of alkalimetal cyanides eg NaCN KCN dissolve 1538 kPa above the solution The dissolution of gold was measured gravimetrically weighing accurately the gold

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Effect of pH Alkalinity on Gold Leaching
Effect of pH Alkalinity on Gold Leaching

Effect of pH Alkalinity on Gold Leaching Previous Next Researchers investigated the effect of calcium hydroxide and sodium hydroxide on the rate of dissolution of gold in cyanide solutions containing 010 NaCN Their work was done on gold discs having a surface area of 10 sq cm 100 ml of cyanide solution was used and this was aerated

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gold leaching solution
gold leaching solution

gold leaching solution Gold leaching in cyanide starved copper solutions Mining Gold leaching in cyanide starved copper solutions in the presence of glycine Ores in which gold occurs in chemical composition The most commonly used process for gold extraction with dilute alkaline cyanide solution and air is US4557759A Iodine leach

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Gold and Silver Leaching in Alkaline Amino Acids
Gold and Silver Leaching in Alkaline Amino Acids

Gold silver and copper can be all be differentially leached using glycine allowing sequential leaching with change in temperature and oxidant typeconc Heating the leach solution between 40 and 60 °C was found to enhance the gold dissolution significantly in alkaline amino acid –peroxide solutions

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