Sodium thiosulfate At the beginning of the development of the chemical the formula of this additive was considered Na2S2O4 and was named sodium hypo sulfate The short name is called Hypo Later its formula Na2S2O3 was established Due to its acronym hypo becoming more popular its common name is still hypo today Sodium thiosulfate Preparation
Get PriceA paper published by L Elsner in 1846 first correctly identified the chemical reaction that forms the basis of all gold cyanide leaching processes 4 Au 8 NaCN O 2 2 H 2 O → 4 Na [Au CN 2] 4 NaOH The equation is well known but the successful application of this reaction in a gold mining operation is rarely straightforward
Get Pricethiosulphate leaching of gold is often conducted in the conventional cu nh 3 s 2 o 3 2− h 2 o system that has been studied for more than three decades abbruzzese et al 1995;aylmore and
Get PriceGold sodium thiosulfate is a fairly common sensitizer with elicitation of symptoms linked to gold in jewelry occupational exposure to gold dental restorations gold plated intracoronary stents and previous rheumatoid arthritis treatment How can you avoid contact with Gold Sodium Thiosulfate
Get PriceThiosulfate is considered a non toxic alternative to cyanide and can leach gold faster than cyanide In the conventional cyanide process the recovery of gold and silver from ores is hindered by a variety of metal impurities like copper arsenic antimony zinc and nickel since these consume either cyanide or oxygen
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Get PriceAssociated Sufide Minerls in Thiosulfate Leaching of Gold Problems and Solutions Doctor of Philosophy Thesis Queen ́s University Chemistry 2024; Cyanide is used eXiensively in the mining industry to leach gold and silver from their ores Cyanide in the form of sodium or potassium cyanide is added in excess to that required
Get PriceThiosulfate leaching can be considered a non toxic process the gold dissolution rates can be faster than conventional cyanidation and due to the decreased interference of foreign cations high gold recoveries can be obtained from the thiosulfate leaching of complex and carbonaceous type ores In addition thiosulfate can be cheaper than cyanide
Get PriceA two level full factorial design 23 was adopted to investigate the effects of concentration of thiosulfate 0 2 1 M Na2S2O3 ammonia 0 5 1 M NH3 and copper 0 05 0 1 M CuSO4 on the
Get Priceus patent leaching gold for caustic soda joola phenix red rubber imaigenostredame be thickener type for caustic soda where is gold mined in africa where iron is mined wet grinder south african where is copper mined in south africa us patent leaching gold for caustic soda gold mining equipment vibrating bed element about gold being mined adit mining machine 30 cfr 75 380 d 7 iv 3 techniques of
Get PriceWhile thiosulfate is a potential option you do need to look at the mineralogy of the deposit It widely known that cyanide does not always work and some other process must be used This may include pretreatment to make the ore leachable So always look at the ore and its characteristics do not just assume that one process or another will work
Get PriceGold dissolution and copper suppression during 2024 3 1 In the presence of copper sulfide minerals leaching gold at high pH is performed by adding caustic soda instead of lime Adding lime at pH > 11 can decrease the gold dissolution due to the formation of passivating films of gypsum on the gold surface Kudryk and Kellogg 1954 Capacity
Get PriceIn order to form hyposulphite double salts the gold must become oxidised the oxygen being derived from the air absorbed by the solution Consequently it is the quantity 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
Get PriceProcesses for recovering gold from copper gold ores thiosulfate leaching or gold ores copper catalyzed thiosulfate leaching using ion exchange technology are disclosed The processes include subjecting the gold bearing and copper bearing thiosulfate solution to a pH and/or temperature adjustment to reduce tetrathionate concentration in the thiosulfate solution prior to contacting with an ion
Get PriceThiosulfate leaching can be considered a non toxic process the gold dissolution rates can be faster than conventional cyanidation and due to the decreased interference of foreign cations
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Get PriceCaustic Soda And Sodium Thiosulfate Leach For Gold Mar 01 2024 By leaching at high pH 12 5 using caustic soda copper precipitates as Cu 2 O/CuO/Cu OH 2 and releases cyanide ions In the presence of copper sulfide minerals leaching gold at high pH is performed by adding caustic soda instead of lime Read More
Get PriceNov 25 2012Caustic soda Lye sodium hydroxide NaOH is a very strong base the opposite of acid it will not dissolve gold some base metals can react with it to form oxides and hydroxides of these metals or the metals may break down like solder Inquire Now US4738718AMethod for the recovery of gold using
Get PriceSodium aurothiosulfate or sanocrysin is the inorganic compound with the formula Na3[Au S2O3 2]·2H2O [clarification needed] This salt contains an anionic coordination complex of gold I bound to two thiosulfate ligands It is colorless [1] [2] History [ edit]
Get PriceSodium gold thiosulfate AuH2Na3O6S4 CID 27176 structure chemical names physical and chemical properties classification patents literature biological
Get PriceSodium hydroxide NaOH an inorganic compound with following synonyms 1 Caustic soda 2 Lye 3 Sodium hydrate NaOH widely used the inorganic industrial chemical NaOH is having certain properties like Sodium hydroxide s chemical formula is NaOH NaOH molecular weight of 39 997 g/mol Sodium hydroxide is contained ph of 12 14
Get PriceVarious aspects of the invention involve interactions between ion eXchange resins and gold bearing thiosulfate Solutions BACKGROUND OF THE INVENTION One of the conventional methods for the extraction of gold from its ores requires a cyanidation process in which a finely ground gold bearing ore is leached with a Solution containing cyanide ion
Get PriceRatings ‐‐ Chemical Effect Explanation of Footnotes A = Excellent 1 Satisfactory to 72°F 22°C B = Good Minor Effect slight corrosion or discoloration 2 Satisfactory to 120°F 48°C C = Fair ‐‐ Moderate Effect not recommended for continuous use Softening loss of strength swelling may occur D = Severe Effect not recommended for ANY use
Get PriceThiosulfate leaching of roasted concentrate resulted in 98% gold and 93% silver recovery after 48 hours Under the conditions used in this study reagent consumption was high ranging from 36 to 70
Get PriceI recently read that sodium thiosulfate can be used for gold and silver leaching in much the same way as cyanide but with no worries about toxicity This intrigues me aqua regia is a pain to work with and cyanide is too toxic for an amateur but thiosulfate is already one of my favorite reagents cheap nontoxic and has so many uses
Get PriceEffect of different pH ranges in gold leaching by chloride —hypochlorite solutions a as well as distribution of HClO species as a function of pH Experimental conditions were 25 g/L of Ca OCl 2 and 15 g/L of NaCl 10% of solids w/v −37 0 µm at room temperature Full size image
Get PriceIn this research the adsorption process of gold thiosulfate complex on thiol modified activated carbon was studied Thioglycolic acid ATG was impregnated in activated carbon and its adsorption ability was tested with synthetic solutions of gold and sodium thiosulfate Au 10 mg·L 1 Na 2 S 2 O 3 0 1 mol·L 1 pH = 10 0
Get Pricein gold recovery the objective of this study is figuring out the effect of sodium nitrite as an oxidizing reagent on cyanidation of refractory gold ore Cyanide leaching of the concentrate was performed at 20% w/w of solid 500 gram of refractory sulfide gold ore concentrate in a 2 5 liter glass reactor with aeration and stirred at 250 rpm
Get PriceSDS Catalog # Name Synonyms; LC10030 LC10030 Acetate buffer for chlorine for cyanide Acetate buffer pH 4 for chlorine Acetate buffer for cyanide
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