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Ammonium aluminium sulfate | 18 Publications | 107 Citations | Top ...
Ammonium aluminium sulfate is a(n) research topic. Over the lifetime, 18 publication(s) have been published within this topic receiving 107 citation(s). Popular works include Recovery of high surface area alumina from aluminium dross tailings, Extraction-spectrometric determination of lead in high-purity aluminium salts. and more.
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Ammonium thiosulphate leaching of gold from printed circuit board waste
NH3 concentrations that were too low reduced the amount of Cu (NH3)42+ (oxidizing agent for gold) that was available, which in turn also reduced Au leaching. The optimum S2O32-/NH3 ratio for the range of parameters that were investigated was found to be 0.5. A change in NH3 concentration was found to have a more significant effect on Au ...
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Water column leaching recovery manganese and ammonium sulfate from ...
Jun 18, 2022Toxic species, manganese sulfate (MnSO 4) and ammonium sulfate ((NH 4) 2 SO 4) that plentifully incorporated in the upstream acid leaching and neutralization for standard electrolyte preparation, are left into EMR and liable to release into the natural environment with the help of rainfall (Zheng et al., 2018), especially in southern China ...
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In Situ Leach Mining of Uranium - World Nuclear Association
Otherwise, acid (sulfate) leaching is generally better. In this case the leach solution is at a pH of 2.5-3.0, about the same as vinegar. Acid leaching gives higher uranium recovery - 70-90% - compared with 60-70% for alkaline leach, and operating costs are about half those of alkaline leach.
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Kinetic aspects of gold and silver leaching in ammonia-thiosulfate ...
The leaching of gold in thiosulfate solutions is an electrochemical reaction involving the oxidation of gold to gold thiosulfate, as shown in Eq. (1). The standard potential for this reaction is 0.15 V [1], and thus, dissolved oxygen ( E °=0.4 V in alkaline solutions [2]) should oxidise gold to gold thiosulfate.
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A Review on Various Aspects of Jarosite and Its Utilization ... - IIETA
In 2010 Vu et al. [52] investigated the approaches for the production of pigment quality magnetite from jarosite, which were precipitated from manganese sulfate leach liquors. They observed that the ammonium and sodium jarosite produced from the acidic leaching solution was transformed into pigment-quality magnetite by alkali decomposition of ...
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Geomembrane Liners for Radioactive or Hazardous Waste Liquid, Such as ...
Aug 30, 2022Most gold heap leaching plants often use vehicles, front-end loaders, and bulldozers to transport and unload ore to build piles, and at the same time loosen them in time to prevent the ore piles ...
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Ammonium Sulfate | Mosaic Crop Nutrition
A solution containing dissolved ammonium sulfate is often added to post-emergence herbicide sprays to improve their effectiveness at weed control. This practice of increasing herbicide efficacy with ammonium sulfate works particularly well when the water supply contains significant concentrations of calcium (Ca), magnesium ( Mg) or sodium (Na).
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Ammonium sulfate leaching of NaOH-treated monazite
Results of the ammonium sulfate leaching tests conducted on a monazite sample (d80 = 14.61 μm) at 0.5 M (NH 4) 2 SO 4, pH 4, and ambient temperature after the NaOH pretreatment step in 10, 30, and 50 % solutions at 80 °C for 24 h; a) total REE recoveries, b) element-by-element recoveries.
WhatsApp:+8617329420102The Extraction of Gold from E-waste by Hydrometallurgy
In this research, gold leaching will be based on laboratory criterion and copper extraction will be according to laboratory standards and a pilot study,Kamberovic, et al.11 So as to leach electronic and electrical waste and extract gold and silver, ammonium thiosulfate could be used as a leaching agent and copper sulfate could be applied as a ...
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10.1016/S0301-7516(03)00107-8 | DeepDyve
Ammonium thiosulfate is an inexpensive, nontoxic reagent, used mostly for fertilizer. Acceptable leaching rates using thiosulfate are achieved in the presence of ammonia with cupric ion acting as the oxidant. Newmont has developed a heap leach process using ammonium thiosulfate for gold recovery from low-grade carbonaceous sulfidic gold ores.
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Thiosulfate Leaching of Gold from Copper Bearing Ores
Ammoniacal Thiosulfate Leaching Ammonium thiosulfate has been used in photography for many decades. It is also used as fertilizer and from an environmental standpoint, has a definite advantage over cyanide. Dissolution rates of gold and silver in thiosulfate are comparable to those for thiourea and faster than cyanide.
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Serpentinite Carbonation Process Routes using Ammonium Sulfate and ...
The serpentinite is assumed to be mined at the Hitura nickel mine and transported (550 km) to a CO 2 mineralisation plant at an industrial lime kiln by truck. 99.5 % of the ammonium sulfate is recycled within the process and make-up ammonium sulfate and ammonia are transported to the site by truck (200 km) from a regional (storage) facility.
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A study of thiosulfate leaching of gold from carbonaceous ore and the ...
The objective of this study was to investigate leaching of gold from carbonaceous ore using ammoniacal thiosulfate solutions, and to determine the consumption of thiosulfate during leaching. The quantitative determination of thiosulfate in the leached solution in the presence of sulfite and sulfate ions was accomplished by means of flow ...
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Separation of polythionates and the gold thiosulfate complex in gold ...
A method for the separation of the polythionates (S x O 6 2−, x= 3-5) in gold thiosulfate leach solutions using ion-interaction chromatography with conductivity and ultraviolet (UV) detection is described. Polythionates were eluted within 18 min using an eluent comprising an acetonitrile step gradient at 0.0 min from 15% v/v to 28% v/v, 3 mM TBAOH, and 2.5 mM sodium carbonate, operated ...
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Thiosulfate leaching kinetics of gold in the presence of copper and ...
It is clear that gold leaches faster at higher ammonium concentrations; such a result is certainly surprising. It has also been found that the addition of ammonium ions affects the kinetics of the copper (II)-thiosulfate reaction, as shown in Figure 12. It is clear that this reaction also occurs at a higher rate at the lower pH values.
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metallurgy - Leaching | Britannica
Leaching. Oxides are leached with a sulfuric acid or sodium carbonate solvent, while sulfates can be leached with water or sulfuric acid. Ammonium hydroxide is used for native ores, carbonates, and sulfides, and sodium hydroxide is used for oxides. Cyanide solutions are a solvent for the precious metals, while a sodium chloride solution dissolves some chlorides.
WhatsApp:+8617329420102A Sustainable Method for Ti, Al and Mg Recovery from Titanium-Bearing ...
6 days agoA sustainable method for Ti, Al, and Mg recovery from titanium-bearing blast furnace slag (TBBFS) coupled with CO2 sequestration by leaching residue is proposed. The results show that the original mineral phase of the TBBFS could be destroyed by ammonium sulfate roasting, in which the valuable metals were converted to sulfates. Subsequently, Ti, Al, and Mg in the roasting slag were effectively ...
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University of Nevada
consumption, using ferric ammonium sulfate as a. Page No. catalyst- ATS autoclave leach tests. 42. Gold extraction from BMG ore in absence of ... 1 Percent gold extraction versus leaching time for Carlin and Battle Mountain Gold (BMG) ores- cyanidation bottle roll tests. 57.
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Thiosulfate leaching of natural Acanthite ore in copper-ammonia ...
Thiosulfate leaching of natural Acanthite ore in copper-ammonia-ammonium sulfate medium: Creator: Lai, Yueh (Yves) Publisher: University of British Columbia: Date Issued: 2017: Description: Silver is commonly present in acanthite in nature. Reagents like cyanide are used to extract silver from acanthite ores.
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Fundamental Insights into Deactivation by Leaching During Rhenium ...
5 ammonium groups. However, these catalysts all demonstrated some leaching during DODH of diethyl tartrate with 3-pentanol as reductant and solvent.22 Sharkey et al. tried using a catecholate ligand with a tether as an anchoring strategy, but rhenium was found to leach.23 In an approach to replace the expensive rhenium by alternative metals in supported deoxydehydration
WhatsApp:+8617329420102Effect of Pyrite on Thiosulfate Leaching of Gold and the Role of ...
the solution and facilitated the gold leaching in the presence of pyrite. Keywords: gold leaching; thiosulfate; pyrite; additives; passivation 1. Introduction Ammoniacal thiosulfate has been studied over the last three decades as a nontoxic and highly-efficient alternative lixiviant to cyanide for leaching gold from gold ores with copper(II ...
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SciELO - Brasil - Leaching of gold and silver from printed circuit ...
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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1-Ammonium Thiosulfate Ecological Viable Alternative to Replace Sodium ...
leaching gold and silver, easy to get and manipulate. This work is done in the Technological Institute of Parral in a low-grade ore from the southern region of the state of Chihuahua. This document has been enriched presented in the IMEC 2014, with the increase of series V and VI. Key words: Leaching, cyanide, ammonium thiosulfate. 1. Introduction
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Ammonium Thiosulfate - The Chemical Company
Ammonium Thiosulfate. Ammonium thiosulfate is a white crystalline solid inorganic compound with the chemical formula H 8 N 2 O 3 S 2, and CAS 7783-18-8. The slightly toxic compound is used in photography, leaching of gold and silver, and as a fertilizer. Request Quote.
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Gold Metallurgy and Leaching Process - Mineral Processing & Metallurgy
Gold and Silver Leaching. For Gold and Silver, the most common leachants used are Na or K cyanides in the presence of oxygen, Thiourea (NH 2. CS.NH 2), also in the presence of oxygen, or Ammonium polysulphide (NH 4) 2 Sx, especially for Gold. Optimum physical conditions for cyanidation are: Maximum temperature of 85 o C, Operating ph range of 9 ...
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US6632264B2 - Gold recovery from thiosulfate leaching - Google
Processes 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 ...
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Thiosulfate leaching of gold—A review - ScienceDirect
The ammoniacal thiosulfate leaching process for gold and silver extraction has been reviewed in terms of leaching mechanism, thermodynamics, thiosulfate stability, and gold recovery options. The application to different ore types and process options have also been discussed.
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Cyanide Gold Leaching with Copper Present - Hydrometallurgy: Leaching ...
1st, the leaching pH was reduced to a minimum, taking very good care that it does not fall out. Under this parameter, the leaching of gold can be improved by depressing the copper leaching. pH 9.5. 2nd low concentrations of cyanide but without lowering them, in our experience was 250-300 ppm of free cyanide.
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The treatment of copper-gold ores by ammonium thiosulfate leaching - CORE
The behaviour of thiosulfate, tetrathionate and sulfate in solution was studied using ion chromatography. The copper sulfide minerals chalcopyrite and enargite seem to be unreactive toward an ammonium thiosulfate leach. Covellite and chalcocite leach to a slight extent in this leaching system.
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Gold Recovery Process from Primary and Secondary Resources Using ...
In this process, pulverized ores are leached using alkaline cyanide solution to extract gold as gold (I)-cyanide complexes according to the following reaction: 2 2 2 4Au + 8CN − + O 2 + 2H 2 O = 4AuCN 2 − + 4OH − E3 Figure 14. Flow sheet of conventional gold recovery process from gold ores using alkaline cyanide solutions.
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Vanadium element extraction methods - smelting, leaching, roasting ...
The general process of obtaining vanadium from its ores is in the form of vanadium pentoxide (V 2 O 5) through performing a variety of processes like smelting, leaching, and roasting after which the pentoxide is reduced to ferrovanadium or vanadium powder. Very pure vanadium metal resembles titanium with respect to certain physical properties ...
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ammonium carbonate leaching of copper - Sebocom Construction
The effect of reaction temperature on the leaching rate of copper from the malachite ore in ammonium sulfate solutions was examined at temperatures of 30, 40, 50, 60, and 70 °C. While conducting these experiments, the values of ammonium sulfate concentration, solid to liquid ratio, particle size, and stirring speed were fixed at 4 mol/L, 2 g ...
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Ammonium thiosulfate - Infogalactic: the planetary knowledge core
This process is a nontoxic alternative gold cyanidation. Other. It can be used as an fertilizer. As suggested by some research studies it can be used as an additive to coal-waste mixtures to reduce formation of very dangerous dioxins and furans. See also. Thiosulfate; Sodium thiosulfate; Ammonium sulfate; References. ↑ MSDS - Ammonium Thiosulfate
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Gold leaching by organic base polythionates: new non-toxic and secure ...
The proposed method of the gold recovery comprises leaching with a solution of a mixture of sodium and ammonium hydrosulfite and thiosulfate, by sorption of the thiosulfate-gold complex on a highly basic anion exchanger and by isolation of the highly basic anion exchanger, the sorption being carried out 2-10 hours after the leaching.
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Industrias Peñoles | Other products
Ammonium Sulfate. Fertilizer in the form of brown and white crystals, used to deliver nitrogen and sulfur to crops. Specification sheet. Ammonium Sulfate; Download . ... Chemical in the form of blue crystals used in mining in zinc flotation processes and gold leaching. Specification sheet. Copper Sulfate; Download . Antimony Trioxide.
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Processing - ENVIRONMENTAL ISSUES - Establishment of Uranium ... - 123dok
Leaching. Leaching is the main chemical reagent consumer in the milling process. In addition to dissolving uranium, leaching mobilizes a range of potential contaminants, apart from radionuclides. Reagent addition (quantity) can be minimized by: — Optimization of leach conditions to minimize dissolution of gangue (waste rock) components;
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A comprehensive study of the leaching behavior and dissolution kinetics ...
The leaching behavior of an Iranian copper oxide ore in sulphuric acid was investigated in detail to evaluate the influence of various factors, to optimize the dissolution conditions and to determine the kinetics of the leaching. The results indicated that the increase in the leaching time and temperature enhanced the leaching rate of copper.
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Leaching of gold from sulphide concentrates with thiosulphate ...
A process in the leaching gold from sulfide ores with the oxidized products of the disproportionation of elemental sulfer and OH-ions in the presence of phase transfer catalysis based on the research of gold leaching with mixed solutions of thiosulfate and polysulflde was developed. Over 90% of the gold present was extracted in 2 hours from two concentrates tested under the conditions proposed.
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Is Ammoniathiosulphate, Cupric sulfate and Ammonia good at leaching ...
First of all, both thiosulfate and ammonia will leach gold, but not at the dilute concentrations you are using. Barrick has built a plant in Nevada which uses thiosulfate to recover gold, so it...
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