caustic soda and sodium thiosulfate leach for gold

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feb 1 this corresponds to 0 27 x 10-3 mol/l accordingly the sodium cyanide concentration molecular weight lime or caustic soda must be used in order to the ph of the pulp to 10 or 11 this process technology is not used to leach the gold but only to make the cyanide ions accessible to the gold in the host

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patent woa2 - gold recovery process with hydrochloric

nov 8 a leaching the concentrate in hcl solution with gaseous chlorine to dissolve at least the gold and base metals in the concentrate the sodium ions in the anode compartment pass through a permeable diaphragm and combine with the hydroxyl ions to form sodium hydroxide - caustic soda 96

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sodium thiosulfate - wikipedia

4 naclo + na2s2o3 + 2 naoh 4 nacl + 2 na2so4 + h4o similarly sodium thiosulfate reacts with bromine removing the free bromine from solution solutions of sodium thiosulfate are commonly used as a precaution in chemistry laboratories when working with bromine and for the safe disposal of bromine iodine

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patent us - process of leaching gold - google patents

dec 6 further sodium thiosulfate which has the action of leaching gold is produced by a reaction between caustic soda and sulfur in the recovered material by the flotation method and thus gold is leached at this step the leach rate is increased by heating and/or introducing an oxygen-containing gas

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implementation of sodium hydroxide pretreatment for refractory

request pdf 10 /j hydromet 03 hydrometallurgy alkaline pretreatment of a refractory goldsilver ore containing antimony minerals such and there was little effect on the leaching of arsenic when the concentration of naoh was further increased while antimony was largely dissolved shu et al

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gold extraction from a copper bearing ore - j-stage

for all thiosulphate leach test grams ore sample was added into a ml of ammonium thiosulphate leach solution which was prepared by mixing ammonium hydroxide in the sodium thiosulphate solution the copper sulphate solution was then added and the ph was adjusted by naoh or h45o4 solution

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the alkaline sulfide hydrometallurgical separation recovery - saimm

2 when applied to arsenic trioxide as2o3 sodium arsenite is also formed the reaction is as follows 1 5 h4o + 2 na2s + ½ as2o3 naass2 + 3 naoh 3 naass 2 + na 2 s na 3 ass 3 and sodium thiosulfate na 2 s 2 o 3 also the waste alkaline sulfide solutions can be recycled for further gold leaching or

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adsorption of copper from an ammonia-thiosulfate media using

the ammonia-thiosulfate system with copper offers high gold leaching rates compared to the cyanide system because the reaction is catalyzed by cupric ions 1 thiosulfate na2s2o35h4o ammonium hydroxide nh4oh sodium hydroxide naoh sodium perchlorate naclo42h4o and sodium sulfite na2so3

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dissolution of gold and silver with ammonium thiosulfate from

apr 20 that are difficult to leach with cyanide and ammonium thiosulfate such as the well-known mangano argentiferous and proceeded to neutralize the acidity reaching a ph of 8 with calcium hydroxide then the material was caustic soda lime and ammonium chloride to obtain a ph of 8 and leach

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gold/silver heap leaching and management practices that

used sodium cyanide drums must be triple rinsed and disposed of appropriately when returnable bins are used the customer does not have to clean or dispose of containers lime cao or caustic soda naoh is used to maintain the alkalinity of the leach solution in a ph range of 9 to 11 reagent usage differs from site to

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sodium thiosulfate - wikipedia

4 naclo + na2s2o3 + 2 naoh 4 nacl + 2 na2so4 + h4o similarly sodium thiosulfate reacts with bromine removing the free bromine from solution solutions of sodium thiosulfate are commonly used as a precaution in chemistry laboratories when working with bromine and for the safe disposal of bromine iodine

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dissolution of gold and silver with ammonium thiosulfate from

apr 20 that are difficult to leach with cyanide and ammonium thiosulfate such as the well-known mangano argentiferous and proceeded to neutralize the acidity reaching a ph of 8 with calcium hydroxide then the material was caustic soda lime and ammonium chloride to obtain a ph of 8 and leach

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effect of pyrite on thiosulfate leaching of gold and the role - mdpi

jul 19 during gold leaching in ammoniacal thiosulfate solutions were investigated using pure gold foils the results gempolym m47 carboxymethyl cellulose cmc sodium carboxymethyl starch cms sodium humic acid ha etc and the adjustment of ph was implemented with naoh or hcl solution

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patent us - gold recovery from thiosulfate leaching

oct 14 processes for recovering gold from copper-gold ores thiosulfate leaching or gold ores copper catalyzed thiosulfate leaching using ion exchange the ion exchange resin once loaded with gold and optionally copper is eluted with a mixture of sodium tetrathionate ammonium thiosulfate and sodium sulfite

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leaching of gold and silver from printed circuit board of mobile phones

thus this study investigated the possibilities of extracting gold and silver present in pcb's from mobile phones by leaching with thiosulfate solutions 2 mechanical agitation and temperature of 25°c ± 2°c the ph of the system was controlled between 9 0 and 11 5 with sodium hydroxide naoh or sulfuric acid h4so4

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leaching of gold and silver from printed circuit board of mobile phones

thus this study investigated the possibilities of extracting gold and silver present in pcb's from mobile phones by leaching with thiosulfate solutions 2 mechanical agitation and temperature of 25°c ± 2°c the ph of the system was controlled between 9 0 and 11 5 with sodium hydroxide naoh or sulfuric acid h4so4

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the alkaline sulfide hydrometallurgical separation recovery - saimm

2 when applied to arsenic trioxide as2o3 sodium arsenite is also formed the reaction is as follows 1 5 h4o + 2 na2s + ½ as2o3 naass2 + 3 naoh 3 naass 2 + na 2 s na 3 ass 3 and sodium thiosulfate na 2 s 2 o 3 also the waste alkaline sulfide solutions can be recycled for further gold leaching or

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leach gold using hyposulphite of sodium aka thiosulfate gold

mar 19 the fact that gold will dissolve in sodium hyposulphite solutions is known from the lixiviation of silver and gold ores of free oxygen in the solution by which the reaction is determined as for one equivalent of gold dissolved one equivalent of caustic soda is set free thiosulfate gold extraction leach

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patent woa2 - gold recovery process with hydrochloric

nov 8 a leaching the concentrate in hcl solution with gaseous chlorine to dissolve at least the gold and base metals in the concentrate the sodium ions in the anode compartment pass through a permeable diaphragm and combine with the hydroxyl ions to form sodium hydroxide - caustic soda 96

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thiosulfate leaching of silver from a solid residue after pressure

nov 19 leaching with naoh solutions keywords atmospheric leaching silver sodium thiosulfate ammonia lubin copper concentrate introduction noble metals such as silver platinum group metals pgm and gold are recovered from primary and secondary resources by means of leaching the richest sources

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effect of pyrite on thiosulfate leaching of gold and the role - mdpi

jul 19 during gold leaching in ammoniacal thiosulfate solutions were investigated using pure gold foils the results gempolym m47 carboxymethyl cellulose cmc sodium carboxymethyl starch cms sodium humic acid ha etc and the adjustment of ph was implemented with naoh or hcl solution

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best quality caustic soda/sodium hydroxide at factory prices!

elution stripping of gold adsorbed onto activated carbon- elution involves feeding the carbon into a special pressure vessel called a column the carbon is pumped to the column and the water is drained a mixture of caustic soda and cyanide is pumped through the column to contact the carbon this mixture extracts the

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gold cyanidation - wikipedia

to prevent the creation of toxic hydrogen cyanide during processing slaked lime calcium hydroxide or soda sodium hydroxide is added to the extracting solution to ensure that the acidity during cyanidation is maintained over ph 10 5 - strongly basic lead nitrate can improve gold leaching speed and quantity recovered

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solution for precipitating gold from haucl4 solution - finishing

we let the solution stand overnight to settle down recover gold from it by washing it with water though i know sodium metabisulfite ferrous sulphate s02 copper can precipitate gold but with these above chemicals it takes whole day with auro its takes only few minutes the precipitation is over what could

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implementation of sodium hydroxide pretreatment for refractory

request pdf 10 /j hydromet 03 hydrometallurgy alkaline pretreatment of a refractory goldsilver ore containing antimony minerals such and there was little effect on the leaching of arsenic when the concentration of naoh was further increased while antimony was largely dissolved shu et al

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thiosulphate stability in gold leaching process - bibliothèque et

ammonium thiosulphate is an alternative gold leaching laaviant used to replace quautity depends on the particle size of the zinc powder and stirring streagth in this id content was i1 ieasured by the standard fke assay rriethod standard flux was prepared by rrixing the following reagmts litharge 22 parts soda ash

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leach gold using hyposulphite of sodium aka thiosulfate gold

mar 19 the fact that gold will dissolve in sodium hyposulphite solutions is known from the lixiviation of silver and gold ores of free oxygen in the solution by which the reaction is determined as for one equivalent of gold dissolved one equivalent of caustic soda is set free thiosulfate gold extraction leach

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hydrometallurgical recovery of metals from large printed circuit

sep 29 to simplify the metal leaching process large pieces of pcbs were used instead of a pulverized sample the chemical coating present on the pcbs was removed by sodium hydroxide naoh treatment prior to the hydrometallurgical treatment among the leaching reagents examined hydrochloric acid

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patent us - gold recovery from thiosulfate leaching

oct 14 processes for recovering gold from copper-gold ores thiosulfate leaching or gold ores copper catalyzed thiosulfate leaching using ion exchange the ion exchange resin once loaded with gold and optionally copper is eluted with a mixture of sodium tetrathionate ammonium thiosulfate and sodium sulfite

Get Price

patent us - process of leaching gold - google patents

dec 6 further sodium thiosulfate which has the action of leaching gold is produced by a reaction between caustic soda and sulfur in the recovered material by the flotation method and thus gold is leached at this step the leach rate is increased by heating and/or introducing an oxygen-containing gas

Get Price