how to use ammonium sulfate for gold leaching

  • Absorption Residue by Ammonium Sulphate

    The role that ammonium sulphate plays in the sulphating roasting process and corresponding reaction mechanism are discussed. The roasting kinetics were analysed to elucidate the extraction characteristics of manganese and iron. The effect of ammonium sulphate to PAR ratio, roasting temperature, roasting time, leaching temperature, leaching time,

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  • Leaching and recovery of gold using ScienceDirect

    Conventional gold ore processing is generally conducted by leaching finely divided ore in a basic solution of alkali metal cyanide. Zerovalent metals are oxidised from the metallic state to soluble MX+ ions by dissolved oxygen, and these metal ions are then strongly complexed by

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  • (PDF) Assesment of Ammoniacal Ammonium Sulphate Leaching

    ABSTRACT In the current study, ammoniacal ammonium sulphate leaching (AASL) and pre aeration. as a pretreatment step before the cyanidation of a copper bearing gold ore was studied. Direct cyanide. leaching of the ore resulted in only a ~10% extraction of gold indicating the refractory character of the. ore.

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  • Leaching of gold and silver from printed circuit board of

    The results for leaching gold with alternative reagents, sodium thiosulfate and ammonium hydroxide, show that the best extraction was achieved at 0.1M sodium thiosulfate and 0.2M ammonium hydroxide, when adding 0.1M of hydrogen peroxide as an oxidation agent, obtaining approximately 11% of gold.

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  • LEACHING OF MALACHITE ORE IN AMMONIUM SULFATE

    ammoniacal solutions, ammonium sulfate was cho sen as solvent in this study. In addition, the solution containing sulfate is more suitable for electrolytic recovery of copper from the solution. During the leaching step of this study, the overall reaction occurring between malachite and ammo nium sulfate can be written as follows 344 22

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  • Nitrogen Flashcards Quizlet

    1. Ammonium Sulfate 2. Ammonium Nitrate 3. Ammonium Phosphate 4. Ammonium Phosphate Sulfate 5. Calcium Nitrate 6. Urea (Synthetic Organic 7. UN 32 Solution 8. Sodium Nitrate

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  • LEACHING OF MALACHITE ORE IN AMMONIUM SULFATE

    Leaching of Malachite Ore in Ammonium Sulfate Solutions and Production of Copper Oxide 159. Brazilian Journal of Chemical Engineering Vol. 32, No. 01, pp. 155 165, January March, 2015. fraction versus reaction time, and the kinetic analysis is performed by using heterogeneous reaction models.

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  • Recovery of rare earth elements adsorbed on clay minerals

    The present study investigates the use of ammonium sulfate as a lixiviant in the recovery of rare earth elements (REE) from clays. Rare earth ions are physically adsorbed on clay minerals, with concentrations ranging from 0.05 to 0.5 wt.%.

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  • Ammonium Sulfate As a Lawn Fertilizer Hunker

    Ammonium sulfate also breaks down quickly on contact with water, which means it's at high risk of leaching into groundwater and must be reapplied frequently for a long lasting effect. Its formulation is 21 0 0, which means it contains no phosphorous or potassium, two major plant nutrients.

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  • US3957602A Recovery of copper from chalcopyrite

    Description. One sample was directly leached under ammoniacal conditions while the other sample was initially leached with copper sulfate followed by the ammoniacal leach reaction. The leach solution had a concentration of 80 grams per liter of ammonium sulfate and 75 grams per liter of ammonia as ammonium hydroxide.

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  • Leaching of Gold from the Waste Mobile Phone Printed

    The ammonium thiosulfate contents in the leach liquors were in agreement with the quantity of gold leached in the respective pH ranges. In this process the copper sulfate worked as a catalyst. The experiment conducted with complete PCBs scrap exhibited a maximum leaching of 78.8% gold at the above optimised condition.

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  • Ammonium Sulfate As a Lawn Fertilizer Hunker

    Ammonium sulfate also breaks down quickly on contact with water, which means it's at high risk of leaching into groundwater and must be reapplied frequently for a long lasting effect. Its formulation is 21 0 0, which means it contains no phosphorous

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  • THIO LEACHING Gold Refining Forum

    Thiosulfate is an excellant method of leaching salts of metals. Sodium Thiosulfate will leach all of the salts of silver and gold and leave a colorless solution. Pgm salts will leave an orange to red solution. Ammonium Thiosulfate is an alternative to cyanide leaching.

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  • Effect of additives on thiosulfate leaching of a gold ore

    improved the stability of gold thiosulfate species in solution while carboxy methyl cellulose (CMC) improved gold leaching, but gold was not stable in solution. There was an optimum CMC dosage, and beyond this, further addition of CMC hindered gold leaching. The surfactant sodium dodecyl sulfate (SDS) had a similar effect to CMC. At an agitation

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  • Dual lixiviant leaching process for extraction and

    The optimal concentrations of thiourea, ammonium thiocyanate and ferric sulfate for leaching gold from ore A were 0.13 M, 0.78 M and 0.028 M, respectively, and the gold extraction was 95% under these conditions.

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  • Ammoniacal thiosulphate leaching of gold ore

    The ammoniacal thiosulphate leaching of gold is dependant on both ammonia and thiosulphate concentration. The leaching is improved significantly at a particular ratio of ammonia to thiosulphate concentration and that ratio varies from ore to ore.

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  • Gold cyanidation

    Gold cyanidation. It is the most commonly used leaching process for gold extraction. Production of reagents for mineral processing to recover gold, copper, zinc and silver represents approximately 13% of cyanide consumption globally, with the remaining 87% of cyanide used in other industrial processes such as plastics, adhesives, and pesticides.

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  • Extraction of Iron and Manganese from Pyrolusite

    The residue from desulfurization and denitrification of exhaust gas treatment process with pyrolusite ore as absorbent is regarded as a potential source of iron and manganese. In this study, an extraction process is proposed for recovery of iron and manganese with ammonium sulphate roasting followed by sulphuric acid leaching. Firstly, the conversion mechanism was analyzed through mineral

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  • COMPARISON OF CYANIDE AND THIOSULPHATE LEACHING

    Arsenic sulfides such as arsenopyrite have a negative effect in gold leaching. 5. Copper sulfides ores that contain gold associated with copper sulfide minerals belong to this class. Chalcopyrite and chalcosite are the main copper minerals and they have a detrimental effect in gold leaching. 6.

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  • Why Ammonium Sulfate? Proven Source of Sulfate Sulfur

    Sulf N 174; ammonium sulfate fertilizer provides two essential nutrients your crops need ammonium sulfate and sulfate sulfur. It also provides the cost efficiency you require. As a high analysis fertilizer offering, it packs 900 pounds of total plant food per ton, making more efficient use of your fertilizer bins.

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  • Ammonium Sulfate As a Lawn Fertilizer Garden Guides

    Ammonium Nitrate Disadvantages. The effects on the lawn of high doses of nitrogen are short lived, and it can cause fertilizer burn. Fertilizer burn is dehydration caused by a buildup of salt. The grass blades turns brown, yellow or tan in strips. Severe burn will kill the grass. Sandy soils are subject to leaching,

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  • Ammonia Leaching A New Approach of Copper Industry in

    Dec 10, 20130183;32;Ammoniacal Leaching of Other Elements. Ammonia leaching has also been used for recovery of nickel and cobalt from oxide, sulfide and complex ores. For example, the so called Caron process was developed to recover nickel and cobalt from low grade ores such as lateritic ores with an ammoniaammonium carbonate solution.

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  • Dual lixiviant leaching process for extraction and

    The optimal concentrations of thiourea, ammonium thiocyanate and ferric sulfate for leaching gold from ore A were 0.13 M, 0.78 M and 0.028 M, respectively, and the gold extraction was 95% under these conditions. The molar ratios of thiourea to thiocyanate to ferric

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  • Effect of additives on thiosulfate leaching of a gold ore

    leaching, but gold was not stable in solution. There was an optimum CMC dosage, and beyond this, further addition of CMC hindered gold leaching. The surfactant sodium dodecyl sulfate (SDS) had a similar effect to CMC. At an agitation speed of 250 r/min, 100% leach recovery of gold was achieved with 0.03 M fresh ammonium thiosulfate, 2 mM EDTA

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  • Assesment of Ammoniacal Ammonium Sulphate Leaching

    ~10% to ~30%). These findings have demonstrated that ammonia/ammonium sulphate leaching prior to the cyanide leaching can be used suitably for the pretreatment of refractory copper bearing gold ores.

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  • THIOSULPHATE LEACHING AN ALTERNATIVE TO

    leaching process are benign, and there is great potential to apply the technology in those jurisdictions of the world where the use of cyanide is banned outright, or is subject to intense negative publicity for environmental reasons. The main chemical components of the leaching process (ammonium thiosulphate and ammonium sulphate) are

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  • Thiosulfate leaching of gold A review Request PDF

    Thiosulfate 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

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  • Leaching of Gold from the Waste Mobile Phone Printed

    viz. ammonium thiosulfate concentration, copper sulfate concentration, pH and pulp density was studied. A leaching of 56.7% gold was obtained under the optimum condition of 0.1M ammonium thiosulfate, 40 mM copper sulfate, pH 10 10.5, pulp density 10 g/L at room temperature and stirring speed of 250 rpm in 8h duration.

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  • The treatment of coppergold ores by ammonium thiosulfate

    In conclusion, ammonium thiosulfate leaching for gold recovery preferably should be performed at low thiosulfate concentrations, ranging from 0.1 to 0.2 M; an ammonia to thiosulfate ratio of 12; copper concentrations ranging from 50 to 100 ppm; an alkaline pH, preferably 910;

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  • A Method for Leaching or Dissolving Gold from Ores or

    lurgical gold extraction routes utilize a leaching step to produce a gold bearing solution as an intermediate product while the recycling of secondary gold from electronic and precious metal scrap is based on the selective and fast dissolu tion of the precious metal. Therefore, A Method for Leaching or Dissolving Gold from Ores or Precious

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  • (PDF) Ammonia Leaching A New Approach of Copper Industry

    Ammonia and ammonium salts have been recognized as effective leaching agents in hydrometallurgical processes due to low toxicity and cost, easy recovery and high selective recovery of metals.

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  • Leaching of gold and silver from printed circuit board of

    The results for leaching gold with alternative reagents, sodium thiosulfate and ammonium hydroxide, show that the best extraction was achieved at 0.1M sodium thiosulfate and 0.2M ammonium hydroxide, when adding 0.1M of hydrogen peroxide as an oxidation agent, obtaining approximately 11% of gold.

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  • COPPER(II) EXTRACTION FROM AMMONIA LEACH SOLUTION

    Ammonia leaching is frequently used in hydrometallurgy for processing of oxide and sulfide ores, concentrates or by products, particularly those containing significant amounts of carbonate rocks, which during the acidic leaching contribute to increased acid consumption. Ammonia and its salts (carbonate or sulfate) are very effective and

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  • Sodium Thiosulphate Gold Leaching

    The gold industry has been seeking alternative reagents for leaching gold from low grade ores for the past 25 years. The cost and transport of cyanide, the poor recovery of gold from carbonaceous ores, the lack of selectivity of cyanide towards copper minerals and the cost of waste treatment are real factors which can make cyanide unattractive in some circumstances.

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  • Thiosulphate Dropped Testing for PM? Page 2 Gold

    When we mix the sodium thiosulfate with the ammonium sulfate, we were told to use a very small amt of copper sulfate, as well. Those three put the ph at about 7.5 after we add the ore. Some people on this forum have said the ph needs to be between 9

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  • Ammonia Gold Dissolution Leaching

    Ammonia and Ammonium sulfate were used as lixiviants. The pH of the solution was adjusted by changing the ratio of ammonium ions (NH4+) to free ammonia (NH3). The pH of the solution was measured at room temperature and unless otherwise mentioned, this value was kept constant at 10.2. Sodium sulfate was used as the supporting electrolyte.

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  • The treatment of coppergold ores by ammonium thiosulfate

    Ammonium thiosulfate is particularly attractive as an alternative to cyanide for the treatment of coppergold ores. The presence of copper is desirable in a thiosulfate leach, whereas it is detrimental in a cyanide leach.

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  • Treatment of copper rich gold ore by cyanide leaching

    Preleaching of ore can be undertaken to remove reactive copper minerals prior to cyanide leaching of gold. SCERESINI and STAUNTON [17] proposed the removal of copper by cyanide leaching without aeration prior to gold extraction and then adsorption of copper on activated carbon.

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