Leaching Process Bisulfide

bisulfide gold leaching - paroisse-de-bastogne.be

New Alternative To Cyanidation: Biocatalyzed Bisulfide, This paper describes progress in development of an alternative to cyanidation, bisulfide leaching, for extracting gold, silver from refractory ores and concentrat While bisulfide leaching can be implemented abiolically, significant benefits accrue from its practice as a bioprocess integrating precious-metals liberation and extraction steps

YES TECHNOLOGIES: Cyanide-free biocatalyzed leaching of ...

If needed, excess sulfur can be recovered as a byproduct. By using the natural sulfur cycle, the process provides a complete solution to the gold recovery problem. Potential Competitive Advantages: More environmentally friendly-- the bisulfide leaching agent used is about 200 times less toxic than cyanide. Since its invention in 1899 ...

Leaching (chemistry) - Wikipedia

Leaching is the process of a solute becoming detached or extracted from its carrier substance by way of a solvent.. Leaching is a naturally occurring process which scientists have adapted for a variety of applications with a variety of methods. Specific extraction methods depend on the soluble characteristics relative to the sorbent material such as concentration, distribution, nature, and size.

Bioextraction Mechanisms of Metals From Their Ores

Dissolved sulfate waste produced during this process is converted into dissolved bisulfide by sulfate reducing bacteria which then neutralizes acidic pH of waste. Gold is dissolved in this bisulfide solution and recovered with activated charcoal or zinc dust. The described process of gold leaching is in fact natural sulfur cycle and it has been ...

PDF Leaching of Gold from the Waste Mobile Phone

Thiosulphate leaching is a process that removes gold from gold bearing ores without the use of cyanide Although not as aggressive a leaching agent as cyanide thiosulphate offers several technological advantages including its lower toxicity and greater efficiency with gold ... Ammonium thiosulfate Bisulfide Iodide Ammonia Bromide Hypochlorite ...

leaching for silver

The process design of gold leaching and carbon in pulp . The carbon in leach (CIL) process illustrated in Figure 3 is a variation of the CIP process In this process carbon is added directly to the leach circuit so that the leaching and adsorption processes proceed simultaneously Capital cost is reduced as only one set of agitators for both ...

Gold Ore Processing, Volume 15 - 2nd Edition

Gold Ore Processing: Project Development and Operations, Second Edition, brings together all the technical aspects relevant to modern gold ore processing, offering a practical perspective that is vital to the successful and responsible development, operation, and closure of any gold ore processing operation.This completely updated edition features coverage of established, newly implemented ...

gold cyanide leaching process

Gold Metallurgy and Leaching Process. Leaching, often gold, is the process of extracting a soluble constituent from a solid by means of a solvent. In extractive metallurgy, of gold, it is the process of dissolving a certain mineral (or minerals) from an ore or a concentrate, or dissolving certain constituents from materials such as a ...

Uranium, Cesium, and Mercury Leaching and Recovery from ...

The process effluents are generated by a leaching step, a rinsing step or a leachate treatment step. These effluents can be recycled using a counter-current recirculation. In five treatment loops, leaching and rinsing effluents were reused from a loop ( X ) to the next loop ( X + 1) to improve the productivity of the process.

Method for thiosulfate leaching of precious metal ...

Jun 27, 2006· The process of claim 19, further comprising: contacting the pregnant thiosulfate leach solution and/or a barren thiosulfate leach solution with a sulfide and/or bisulfide and/or a polysulfide to convert polythionates in the pregnant thiosulfate leach solution and/or barren thiosulfate leach solution into thiosulfate; and thereafter contacting ...

Carbon disulfide - Wikipedia

Carbon disulfide, also spelt as carbon disulphide, is a colorless volatile liquid with the formula CS 2.The compound is used frequently as a building block in organic chemistry as well as an industrial and chemical non-polar solvent.It has an "ether-like" odor, but commercial samples are typically contaminated with foul-smelling impurities.

Biocatalyzed leaching of precious metal values - HUNTER ...

Sep 12, 1995· In this embodiment of the process, reactor 230 is a side-stream reactor. The rate of addition of portion 220 to reactor 230 may be controlled by pH controller 232 which operates valve 234 to create an optimum pH for precious metals leaching in bisulfide leach solution 238 …

Introduction of Copper Ore Dressing Process - Xinhai

Gold CIL (Carbon in Leach) Process is an efficient design of extracting and recovering gold from its ore. By cyaniding and carbon leaching crushed gold ore slurry simultaneously, CIL process lower the gold mining operation cost and increase gold recovery rate to a degree of 99%.

Sulfide/Bisulfide/Sulfite Leaching | Sulfur | Sulfide

LEACHING Of these possible lixiviants only the bisulfide and bisulfite ions appear to have any practical use under ambient conditions. YES Technologies described a process using bisulfide generated from sulfate reducing bacteria as a lixiviant for gold, although bisulfide ions can readily be generated from hydrogen sulfide gas.

CA2617415C - Method for thiosulfate leaching of precious ...

leach solution thiosulfate thiosulfate leach process Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Active Application number CA002617415A Other languages French (fr) Other ...

A Fundamental Study of the Alkaline Sulfide Leaching of ...

Sulfide is able to act as a lixiviant for the process, and the polysu lfide is the oxidant. The leaching reaction was found to be chemically controlled for both the hydroxide and su lfide systems. It was also shown that gold leaching is very slow when either pure gold samples are used, or when hydrosulfide is used in place of sulfide ions.

Gold Extraction - an overview | ScienceDirect Topics

It may also selectively leach precious metals from base-metal concentrates (Hunter et al., 1998). One of the limitations would seem to be the bio-reduction of sulfate ion using organic substrates for bisulfide regeneration. The bisulfide process is recyclable, but oxidation to sulfate is theoretically possible.

A fundamental study of the alkaline sulfide leaching of gold

A benefit of this process is that during the partial oxidation of the sulfide minerals, the gold tends to accumulate in the elemental sulfur (Fair and Van Weert, 1989; Barth et al., 1998). Since the sulfur can be easily separated from the gangue minerals, this provides a simple way of producing a concentrated gold sample prior to leaching.

Cyanide alternative leaching reagents for gold recovery ...

Bisulfide o o - o - o o Halides + + - o + - / o Thiosulfate o - + - + + + Although thiosulfate shows some drawbacks like a high reagent consumption and a complex disso-lution reaction, it is the most promising leaching reagent for the hydrometallurgical gold recovery from e-waste.

Sulfide/Bisulfide/Sulfite Leaching | Sulfur | Sulfide

5 6 - Free download as Powerpoint Presentation (.ppt / .pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online.

Sodium bisulfite - Wikipedia

Sodium bisulfite (or sodium bisulphite, sodium hydrogen sulfite) is a chemical mixture with the approximate chemical formula NaHSO 3.Sodium bisulfite in fact is not a real compound, but a mixture of salts that dissolve in water to give solutions composed of sodium and bisulfite ions. It is a white solid with an odour of sulfur dioxide.Regardless of its ill-defined nature, "sodium bisulfite" is ...

US Patent for Method for thiosulfate leaching of precious ...

Feb 04, 2010· The leaching retention time is dependent on the material being leached and the temperature, and will range from about 1 hour to 96 hours, preferably from about 2 to about 16 hours, and most preferably from about 4 to about 8 hours. The absence or substantial absence of copper and/or ammonia in the leach greatly simplifies the process.

KINETICS OF GOLD LEACHING IN ALKALINE ... - MAFIADOC.COM

During the alkaline sulfide leaching process, in excess of 90% of the arsenic and antimony is leached leaving behind a high grade copper-sulfide residue [1, 2]. The coppersulfide solids are ideally transferred to a smelter while the leached solution is further processed to precipitate arsenic and antimony.

Leaching of Pyrrhotite from Nickel Concentrate

The utilized leaching process generates by-products, in the form of large quantities of Fe2+ in solution and gaseous H 2 S. To recover Fe2+, crystallization of iron(ii) sulfate (FeSO 4∙nH 2 O) from leach solution through cooling have been studied. The crystallized crystals were further dehydrated into the monohydrate (FeSO 4∙H 2

Portable gold leaching system

Portable gold leaching system HFC Refrigerants (55) HST Hydraulic Cone CrusherHST series hydraulic cone crusher is combined with technology such as machinery, hydraulic pressure, electricity, automation, intelligent control, etc., representing the most advanced crusher technology in the world.

Berend Wassink - UBC Materials Engineering

Solvent extraction-electrowinning process for the recovery of copper and cyanide from copper-gold ore leach solutions. The work was funded by a number of companies. Laboratory work was carried out on the various unit operations to establish suitable conditions for the process. Lab scale continuous testing was carried out on numerous occasions.

US7066983B2 - Method for thiosulfate leaching of precious ...

leach solution process pregnant precious metal Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Active Application number US10/446,548 Other versions US20040035252A1 (en Inventor ...

Leaching of silver sulfide with ferricyanide–cyanide ...

The substitution of cyanide for thiosulfate in the leaching process of mining tailing with silver contents of the order of 60 g/ton, showed that the more oxidizing environment improved the silver ...

US Patent for Method for recovering precious metals and ...

Jun 15, 2012· The present disclosure is directed to a process for recovering a precious metal from a pregnant leach solution using a resin extractant. The precious metal is eluted from the loaded resin using an eluant comprising trithionate. The barren resin is contacted with a sulfide, bisulfide, and/or polysulfide to convert sorbed trithionate to thiosulfate.

PLEASE DO Nar REMOVE FROVI LIBRARY

water soluble, to thevery soluble sodium bisulfide (NaSH), by ion exchange, and then releasing hydrogen sulfide by treating the sodium bisulfide with water and carbon diox­ ide in a reaction analogous to reaction A. The hydrogen sulfide was then converted to sulfur by the Claus process (9-10). However, applying the Claus process to the larger ...

Alternative Lixiviants to Cyanide for Leaching Gold Ores ...

Jan 01, 2016· Sulfide/Bisulfide/Sulfite Leaching—Process Conditions The possible processes investigated using sulfur-based lixiviants for gold are listed in Table 27.6 . The mechanism of gold dissolution and precipitation from aqueous sulfide solutions under a range of conditions has received considerable attention in the early geological literature (e.g ...

NSC Pressure Leaching: Industrial and Potential ...

Alkaline sulfide lixiviation of sulfur residues from the Nitrogen Species Catalyzed Pressure Leaching process ( Anderson, 2003 Anderson,, 2008 Anderson,, 2014Anderson and Twidwell, 2008) has ...

A fundamental study of the alkaline sulfide leaching of ...

Sulfide is able to act as a lixiviant for the process, and the polysulfide is the oxidant. The leaching reaction was found to be chemically controlled for both the hydroxide and sulfide systems. It was also shown that gold leaching is very slow when either pure gold samples are used, or when hydrosulfide is used in place of sulfide ions.

NIOSHTIC-2 Publications Search - 10007345 - Recovery of ...

The paper summarizes the results of continuing laboratory studies using an activated carbon catalyst which was loaded with sulfur through oxidation of ammonium bisulfide solution. The extraction of the sulfur that forms in situ on the catalyst is a key area in the development of the sulfur recovery process.