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PDF Applications of NSC pressure leaching Corby

Applications of NSC pressure leaching C.G. Anderson, Ph.D. Director The Center for Advanced Mineral and Metallurgical Processing Montana Tech Room 221 ELC Building Butte, Montana 59701 [email protected] WWW.MTECH.EDU/CAMP ABSTRACT Industrially proven and applied nitrogen species catalyzed i.e. NSC acidic pressure leaching has been utilized to treat a number of ores,

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THE ADSORPTION AND ELUTION OF PLATINUM GROUP METALS

Higher cyanide concentration in the pre treatment step results in more efficient elution up to a point, and experiments suggest the possibility of an optimum cyanide concentration, beyond which elution efficiency starts decreasing. Introduction The carbon in pulp or carbon in leach CIP and CIL processes have been themercial

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WO2011010289A2 Leaching process for recovery of precious

This invention relates to a process for the recovery of precious metal/s from a precious metal containing material in an aqueous leach slurry or solution. The process includes the step of contacting the precious metal/s in the leach slurry or solution with a ligand selected from dithiooxamide rubeanic acid, or a substituted dithiooxamide.

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high temperature cyanide leaching of platinum group metals

High Temperature Cyanide Leaching of Platinum Group The U.S. Bureau of Mines Reno Research Center investigated, developed, and patented a high temperature cyanide leaching process for recovering platinum group metals PGM from automobile catalysts. A batch pilot plant was constructed at the center and operated to demonstrate this Get price

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Precious metals analysis : ALS

ALS has decades of expertise in reliable and reproducible precious metals analysis by fire assay, cyanide leach and aqua regia digestion at parts per billion to percent levels.

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Assessing a two stage heap leaching process for Platreef

results. Extractions of 20 platinum, 87 palladium and 46 rhodium were achieved, with additional base metal values extracted, within a further 3 week cyanide leach. The role of hydrogen peroxide, or a similar strong oxidant, in aiding the dissolution of PGMs was investigated, but not explored fully in the study. It is postulated that the addition of such oxidants may be beneficial to the

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Hydrometallurgical recovery/recycling of platinum by the

As the leaching was slow at room temperature and pressure, the studies were carried out at elevated temperatures and pressures, showing a cyanide leaching order of Pt Pd Rh due to the metal bonding strength ofplexes, which are ranked as RhCN 6 3 PdCN 4 2 PtCN 4 2 .

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Recovery of palladium, platinum, rhodium and ruthenium

1. Introduction. Palladium, platinum, rhodium and ruthenium, together with iridium and osmium, are called platinum group elements PGEs. These elements have a wide variety of applications in automobile, chemical, electrical, and medical industries Cowley, 2013.For example, Pd, Pt and Rh aremonly used in catalytic converters of automobiles.

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Stimulants The Hive

22/02/2003· Phenylalanine could be converted to benzyl cyanide.Benzyl chloride to benzyl cyanide is very easy also.Easy is benzyl alcohol to benzyl chloride too.Raf made 600 grams of benzyl cyanide out of 1,2 kg benzyl alcohol.If it goes like described in above patent then we

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Cyanide leaching chemistry of platinum group metals.

Previous research by the U.S. Bureau of Mines has shown that autoclave cyanide leaching of used automobiles exhaust catalysts for recovery of platinum group metals PGM is technically feasible. The purpose of this work was to investigate the chemistry of the dissolution of PGM in cyanide solutions

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Cyanide Leaching Method for Recovering Platinum Group

Spent automobile catalytic converters, containing one or more of the platinum group metals platinum, palladium, or rhodium are treated to recover these metals by leaching with a cyanide solution at a temperature greater than 100 deg. C to form metalplexes in solution, removing leached solids from the pregnant solution, and heating the solution to a temperature high enough to

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Cyanide leaching method for recovering platinum group

1. A method for recovering platinum group metal from a catalyst, comprising n a leaching a catalytic converter catalyst containing at least one platinum group metal selected from the group consisting of platinum, rhodium and palladium with a cyanide solution at a temperature greater than about 100.degree. C. to form soluble platinum group metalplexes in solution n b removing

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High Temperature Cyanide Leaching of Platinum Group Metals

High Temperature Cyanide Leaching of Platium Group Metals From Automobile Catalysts. Bureau of Mines 1992. Report of Investigations RI 9428. Platinum and its sister metals are in high demand and found only in a few deposits around the world. The Auto industry relies heavily on them in the use of Catalytic converters for exhaust systems. Many

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VERVIEW OF CYANIDE TREATMENT METHODS

Excess solution from heap or vat leaching operations Supernatant solution from tailings impoundments Seepage collected from ponds or tailings impoundments The term cyanide refers to one of three classifications of cyanide, and it is critical to define the class of cyanide that is to be removed in a treatment plant. The three

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Hydrogen Peroxide and Caro's Acid Powerful Oxidants for

of leach tanks where sodium cyanide, a lixiviate is added along with lime and air. After the gold solution is drawn off in a counter current decantation process, the tailings containing residual cyanide is sent to a tailings pond for disposal see Figure 1.

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Cyanide leaching method for recovering platinum group

3/11/1992· What is claimed is: 1. A method for recovering platinum group metal from a catalyst, comprising a leaching a catalytic converter catalyst containing at least one platinum group metal selected from the group consisting of platinum, rhodium and palladium with a cyanide solution at a temperature greater than about 100° C. to form soluble platinum group metalplexes in

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cyanide leach! cant get 99 Gold recovery Page 2 Gold

9/07/2014· One on the most famous cyanide poisoning events was when a worker died in apany that was processing scrap x ray film with cyanide/peroxide. There was even a 60 Minutes segment on it. Most everyone back then used cyanide for film but this changed abruptly after this death. Technically, cyanide is still about the best thing to use for

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Leaching and recovery of platinum group metals from UG 2

Leaching and recovery of platinum group metals from UG 2 concentrates yields were not good less than 40 per cent. Platinum leaching was particularly poor with cyanide ambient temperature. A HCl/chlorine leach on untreated material had the same effect as a cyanide leach with a nitric acid pre leach,

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VERVIEW OF CYANIDE TREATMENT METHODS mdma

Overview of Cyanide Treatment Methods 4 M. Botz This process is capable of achieving low levels of both cyanide and metals. Generally, the best application of this process is with solutions containing relatively low initial levels of cyanide when treated cyanide levels of less than about 1 mg/L are required. Oftentimes, solutions treated

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Glycine method Gold Refining

19/01/2017· g_axelsson wrote:I couldn't see anything about selective leaching of gold over copper.On the contrary, according to Oraby 2014, The selective leaching of copper from a goldcopper concentrate in glycine solutions a glycine solution was used to selectively leach copper, both metallic and in

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Chlorination Leaching of Refractory Ores Hydrometallurgy

Chlorination leaching of floatation concentrate could be a route for treatment of refractory ores instead of roasting, BIOB or POX panies are also testing fine grinding and oxygen injection using shear reactors in alkaline cyanide systems. Direct leaching of

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Mining Hydrometallurgy DuPont

Gold has been valued for its beauty, malleability, and noncorrosive properties for millennia. Themonly used process is to extract gold by cyanide leaching, which involves using substrates such as activated carbon for gold recovery. Our gold selective ion exchange IX resins, however, are more versatile substrates than activated carbon

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Leaching of gold, silver andpanying metals from

Acta Montanistica Slovaca Ročník 16 2011, číslo 2, 128 131 128 Leaching of gold, silver andpanying metals from circuit boards PCBs waste Jana Ficeriová1, Peter Baláž1 and Eberhard Gock2 Au Ag noble metal wastes represent a wide range of waste types and forms, with variouspanying metallic elements.

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A Review on Alternative Gold Recovery Re agents to Cyanide

The widely used chemical treatment process is the leaching with cyanide. After leaching, the pregnant solution is treated to precipitate the gold content via cementation or, more effectively, in resin pulps , . However, because of high toxicity of cyanide it has been discussed in last decades the possibilities of replacing cyanide with

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Innovative Thinking Technology

GlyLeachTM Turning orphan deposits and wastes into viable opportunities GlyLeachTM is the application of Glycine to leach fresh base and precious metal ore sources. These include the use of Glycine as a Lixivant in Dump/Heap Leaching, Continuous Vat Leaching, Traditional Vat Leaching, and Agitated Leaching flow sheets.

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Leaching platinum group metals in a sulfuric acid/chloride

A leaching process was established based on the ability of platinum group metals to form stableplexes in acidic chloride solutions. Industrial catalyst losses were examined for the recovery of platinum, palladium, and rhodium by leaching with a mixture of sulfuric acid and sodium chloride to avoid using aqua regia or autoclave

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Cyanide Leaching of Platinum Group Metals

A significant factores into play when high temperature cyanide leaching is utilized is the loss of cyanide by hydrolysis. The rate of the hydrolysis reaction is negligible at ambient temperatures, butes significant above 100° C. As a cyanide solution is heated, the rate of the following hydrolysis reaction increases rapidly:

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US Patent for Method of removing mercury from solution

FIG. 1 shows a typical gold cyanide leach process. Sodium cyanide is added to the ore along with lime and water including process recycle water from tailings. The ore is ground and thickened with flocculant. The underflow from the thickening process may be treated with the carbamates of Formula I, preferably potassium dimethyldithiocarbamate

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High Temperature Cyanide Leaching of Platinum Group Metals

High Temperature Cyanide Leaching of Platium Group Metals From Automobile Catalysts. Bureau of Mines 1992. Report of Investigations RI 9428. Platinum and its sister metals are in high demand and found only in a few deposits around the world. The Auto industry relies heavily on them in the use of Catalytic converters for exhaust systems. Many

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Prof Jacques Eksteen Curtin University, Perth, Australia

His recent research has been mostly in the area of leachingplex refractory ores, such a pressure leaching, bio heap leaching, cyanide heap leaching, investigating solar technology for process heating associated with heap leaching, new approaches to precious metals solid liquid separation, and using ion exchange, molecular recognition

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A new technique for extraction of platinum group metals by

Leaching of platinum and palladium with alkaline cyanide solutions has been shown to be feasible for a number of leach modes. The platinum and palladium leaching will typically take place at

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US20080105088A1 Method for thiosulfate leaching of

A traditional technique for recovering precious metals from precious metal containing ore is by leaching the material with a cyanide lixiviant. As used herein, a precious metal refers to gold, silver, and the platinum group metals e.g., platinum, palladium, ruthenium, rhodium, osmium, and iridium. Many countries are placing severe limitations on the use of cyanide due to the

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A Review on Alternative Gold Recovery Re agents to Cyanide

The widely used chemical treatment process is the leaching with cyanide. After leaching, the pregnant solution is treated to precipitate the gold content via cementation or, more effectively, in resin pulps , . However, because of high toxicity of cyanide it has been discussed in last decades the possibilities of replacing cyanide with

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STUDIES ON PLATINUM RECOVERY FROM SOLUTIONS AFTER LEACHING

sodium cyanide solutions were tested. After leaching, the metal ions in leach solutions have to be separated and purified by solvent extraction. Typical leach liquor contains economically valuable metal ions such as platinumIV, palladiumII, rhodiumIII nickelII and manganeseII. The influence of several factors on the efficiency and

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Studies on platinum recovery from solutions after leaching

After leaching, the metal ions in leach solutions have to be separated and purified by solvent extraction. Typical leach liquor contains economically valuable metal ions such as platinumIV, palladiumII, rhodiumIII nickelII and manganeseII. The influence of several factors on the efficiency and selectivity of platinumIV ions

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Mining Hydrometallurgy DuPont

Gold has been valued for its beauty, malleability, and noncorrosive properties for millennia. Themonly used process is to extract gold by cyanide leaching, which involves using substrates such as activated carbon for gold recovery. Our gold selective ion exchange IX resins, however, are more versatile substrates than activated carbon

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PDF Hydrometallurgical recovery/recycling of platinum by

This paper reviews platinum leaching from such resources using acidic and alkaline solutions in the presence of oxidizing agents, such as nitric acid and hydrogen peroxide, sodium cyanide and

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silver leaching plant equipment

Leaching Plant, Leaching Plant Suppliers and Manufacturers at , 1483 Results , Leaching Plant, Buy Various High Quality Leaching Plant Products from Global , China Mining Machinery Manufacturer Cyanide Leaching Equipment Gold , New Conditional Mining Concentration Silver Leaching Plant. Contact Supplier

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Sodium cyanide in Australia Chemlink

Sodium cyanide is manufactured by the Andrussow process using ammonia, natural gas, air, and caustic soda. The process reacts ammonia with natural gas and air over a platinum/rhodium catalyst to produce hydrogen cyanide gas. Raw Materials Ammonia. The production of 1 tonne of sodium cyanide requires: 0.65 tonnes oa ammonia. Caustic Soda

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The Manufacture of Hydrocyanic Acid by Andrussow Process

The Manufacture of Hydrocyanic Acid by the Andrussow Process By J. M. Pirie, Ph.D.,A.M.1.Chem.E. The manufacture of hydrocyanic acid by thebination of methane, ammonia and air has increased remarkably in recent years. Some of the features of this process, particularly the variety of platinum metal catalysts employed in it, are surveyed in this article.

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