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The present invention is applicable to improving the recovery of gold by adapting the chloride or thiourea leaching processes The presence of an oxidizing agent in combination with an alternating electric field apparently ensures that the oxidation state of the gold is raised to enable the formation of a soluble complex with a suitable lixiviant
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Feb 15 2007018332A novel reagent for gold leaching was synthesized and the leaching conditions investigated The reagent 1phenyl2thio32hydroxyethyl urea dissolved gold at relatively high yields gt95 in the presence of an oxidant FeIII in a sulfuric3032
T1 THIOUREA LEACHING OF GOLD AND SILVER TECHNOLOGY UPDATE AND ADDITIONAL APPLICATIONS AU Hiskey J B PY 1984121 Y1 1984121 N2 The review of recent literature relating to the use of thiourea as a lixiviant for gold and silver indicates only4753
Nov 23 2012018332A solution composition that permits the use of thiourea is provided The process is to form a solution that improves on one hand the velocity of gold and silver extraction from minerals and other materials that contain them improving the stability of the thiourea in the leaching solution and on the other the direct electrorecovery of the metals from the solution3520
Specifically the patent refers to a process to form a solution that improves on one hand the velocity of gold and silver extraction from minerals and other materials that contain them improving the stability of the thiourea in the leaching solution and on the other the direct electrorecovery of said metals from the aforementioned solution4113
The reduction of goldIthiourea occurs242933 according toreaction 2and isdiffusion controlled at cathodic overpotentials between 015 and 035V after which slight inhibition occurs29Atthepeak ofthe curve forcathodic current versus potential Fig 1the4416
Nov 09 2015018332Very interesting info on Theo leaching Thanks to all I have access to several hundred lbsof broken china and glass per week all with 2422k gold trimplating I have been using HCLCl to remove the gold then dropping it with SMB But with this method I end up with a lot of HCL which I reuserecycle in a variety of ways3426
Sep 28 2020018332As result of this comparison thiourea stands out as the most promising alternative gold leaching reagent to cyanide Comparison of different leaching reagents Gold production amount t and3052
In order to determine the maximum size to which an ore may be ground for CLS leaching thiourea leaching or any kind of leaching a number of tests should be run One can rough grind to 40 mesh or even 20 mesh and run several CLS 2 tests on 2 pounds or one ounce of ore See Chapter 74918
The treatment of these dumps does not require an ore pretreatment stage since for the actual grainsize class 0074 mm 5811 the content of cyanided gold is 897 This work presents the results of studying the extraction of gold from the dumps by thiourea leaching3482
lurgical gold extraction routes utilize a leaching step to produce a goldbearing solution as an intermediate product while the recycling of secondary gold from electronic and precious metal scrap is based on the selective and fast dissolution of the precious metal Therefore A Method for Leaching or Dissolving Gold from Ores or Precious4338
gold thiourea salts solution leaching Prior art date 19900223 Application number PCTAU1991000057 Other languages French fr Inventor Craig Clinton Kenna Original Assignee Cra Services Limited Priority date The priority date is an assumption and is not a legal conclusion3233
Leaching with a relatively concentrated thiourea solution 1MCS NH 2 2 resulted in 83 gold and 75 silver extraction in four hours With the treated flue dust residue gold extraction was about 60 Gold and silver extraction with cyanide was sensitive to3952
Request PDF Thiourea bioleaching for gold recycling from ewaste Recycling and reuse of electronic wastes ewastes are becoming an increasingly critical strategy for securing metal resources4183
Thiourea has been recognised for a long time as an acidstable complexant for gold Generally the use of thiourea has been shown to exhibit enhanced leaching kinetics compared to cyanide but suffers the disadvantage of excessive reagent consumption Thiourea leaching is particularly com patible with the extraction of gold from refractory ores4127
Mill leaching a viable substitute for mercury amalgamation in the May 26 2009 other reagents such as thiosulphate thiourea bromine chlorine This centrifuge was designed for artisanal miners and oper ates with variable 2001 there were 400 gold processing plants using amalgamation in Northget price4610
The use of thiourea for gold leaching is very well known however the electrowinning process has receivcd little attention ln this paper the int1uence of thiourea concentration and temperature on the cathodic behavior of gold in acidic thiourea soutions was studied with different3059
The objective of this study was to investigate thiourea leaching of gold present in the uranium tailings Sulfuric acid treatment for raw material is important in order to dissolve uranium as well as to remove easily leachable metals The acidic thiourea solution was proposed as a nontoxic possible alternative process route to cyanide in gold dissolution3907
Feb 15 2007018332It was found using a rotating disk experiment that when the leaching solution contained 10 thiourea 05 sulfuric acid and 01 ferric ions the rate of gold3125
minerals Article Analysis and Prediction of the Thiourea Gold Leaching Process Using Grey Relational Analysis and Articial Neural Networks Rui Xu 1y Xiaolong Nan 2y Feiyu Meng 1 Qian Li 1 Xuling Chen 1 Yongbin Yang 1 Bin Xu 1 and Tao Jiang 1 1 School of Minerals Processing and Bioengineering Central South University Changsha 410083 China3406
Thiourea is a noncyanide lixiviant for gold leaching which efficiently recovers gold Orgul and Atalay 2002 but this is not an economical route for the gold leaching due to its high consumption4940
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 away4079
The objective of this work was to recover gold and silver from the printed circuit board PCB of discarded mobile phones by thiourea leaching Effects of thiourea concentration leaching temperature leaching time and ferric ion Fe3 concentration on the recovery of gold and silver were investigated The PCB was pretreated physically to reduce the thiourea consumption and enhance the4105
Thiourea leaching has been applied to a refractory gold concentrate previously treated by bacterial oxidation Following the biooxidation gold has been leached in acidic thiourea solutions under different pH1 24 thiourea concentrations 2 15 g1 ferric ion concentrations 004 3 g1 and temperatures 298 333 K3216
T1 THIOUREA LEACHING OF GOLD AND SILVER TECHNOLOGY UPDATE AND ADDITIONAL APPLICATIONS AU Hiskey J B PY 1984 Y1 1984 N2 The hydrometallurgical application of thiourea in processing precious metal ores and concentrates has reached the development stage4900
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