heap leaching thiosulfate

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A Brief Note on the Heap Leaching Technologies for ... - …

Heap leaching is a low-cost technology used in industrial mining to recover precious metals such as gold and uranium, along with several other highly sought after metals like copper, from their primary resources (ores and minerals). For many decades, there has been a growing demand for heap leaching due to its environmental benefits. Heap leaching provides mining …

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GOLD LECHING FROM A SAUDI ORE BY THE …

Gold leaching from a Saudi ore by the nonpolluting thiosulfate process 61 thiosulfate media other than copper and ammonia (Zhang et al., 2005; Chandra et al., 2005). Carbonaceous sulfide ores after oxidative pre-treatment are typically very easy to leach with thiosulfate, while complex metal sulfide ores are much more difficult to treat.

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Method of gold extraction from sulphide gold-bearing ores

Method of gold extraction from sulphide gold-bearing ores. C22B3/04 - by leaching (C22B0003180000 takes precedence);; C22B11 - Obtaining noble metals. FIELD: metallurgy. SUBSTANCE: method includes leaching by solution of mixture of hydrosulphite and sodium thiosulfate and ammonium, sorption of complex thiosulfate-gold on heavy-basic anionite ...

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Solution chemistry factors for gold thiosulfate heap leaching

The Newmont Mining, Nevada, operation has successfully developed a combined biooxidation–thiosulfate heap-leaching process for carbonaceous/high sulfide ores and a direct thiosulfate heap ...

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A novel method for the recovery of silver from ...

The most advanced is the thiosulfate heap leaching of low grade carbonaceous preg-robbing ores by Newmont Mining Co. In most alternative cyanide leaching processes, reductions in the quantity of ...

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Gold Extraction in Carbonaceous Ore using Thiosulfate

Research focused on maximizing gold extraction while minimizing reagent consumption at conditions suitable for heap leaching. Experimental Procedure. Thiosulfate leaching studies were conducted on a low-grade …

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Ammonium Thiosulfate Heap Leaching - Technische ...

A Novel Thiosulfate System for Leaching Gold Without the Use of Copper and Ammonia. Ji, J. / Fleming, C. / West-Sells, P. G. / Hackl, R. P. / TMS | 2003. print version. 245. A Process for Counteracting the Detrimental Effect of Tetrathionate on …

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Thiosulfate Leaching of Gold from Copper Bearing Ores

Thiourea leaching from an oxidized gold-copper ore with 90-95% gold extraction was also reported (McInnes et al., 1989). However, acid pre-leaching of soluble copper was required in order to reduce thiourea consumption to acceptable levels. Ammoniacal Thiosulfate Leaching. Ammonium thiosulfate has been used in photography for many decades.

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(PDF) Thiosulfate Leaching In Carbonaceous Gold-Bearing ...

Heap leaching with cyanide was proposed by the U.S. Bureau of Mines in 1969 as a means of extracting gold from low- grade ores. The gold industry adopted the technique in the 1970s, soon making heap leaching the dominant technology in gold extraction (Da Rosa and Lyon 1997).

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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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Solution chemistry factors for gold thiosulfate heap leaching

Thiosulfate heap-leaching applicationSince the cyanidation process has been very successful in treating oxide ores and non-preg-robbing ores over the years, from a technical point of view, it is still the preferred process for the recovery of precious metals whenever possible. However, cyanide has problems leaching gold occurring in ...

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Heap Leach: Mining's breakthrough technology - …

Heap leaching (HL) is a flexible and constantly developing mineral processing and extraction technology that is gaining popularity and recognition for …

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Method for thiosulfate leaching of precious metal ...

The process is similar to those discussed above except that thiosulfate leaching is performed by heap leaching 400 techniques. The comminuted precious metal-containing material 404 can be directly formed into a heap (in which case the material would have a preferred P 80 size of from about 2 inches to about ¼ inch, ...

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Leaching behaviour of sulphides in ammoniacal …

Heap leaching is a well-established extractive metallurgical technology enabling the economical processing of various kinds of low-grade ores, which could not otherwise be exploited ...

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METHOD FOR THIOSULFATE LEACHING OF PRECIOUS …

The optimum solution thiosulfate concentration to maintain during heap leaching 136 and therefore the optimum solution thiosulfate concentration in the thiosulfate lixiviant 122 will depend on the nature of the material being leached, but will preferably range from about 0.005 to about 2 molar (M), more preferably about 0.02 to about 0.5 M, and ...

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Heap Leaching of Gold-Bearing Deposits: Theory and ...

Groudev SN, Sasova II, Groudeva VI et al. Pilot scale microbial heap leaching of gold from a refractory ore at the Zlata Mine, Bulgaria. In: Vargas T, Jerez CA, Wiertz JV et al, eds. Biohydrometallurgical Processing. Vol I. Santiago: University of …

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THIOSULPHATE LEACHING – AN ALTERNATIVE TO …

Whether the leaching is performed in stirred tank reactors or heaps, the size and type of equipment needed for a thiosulphate leaching flowsheet is very similar to a conventional cyanide leach. SGS is a global technical leader in the field of thiosulphate leaching, and our laboratory and industry experts have spent years designing and developing

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COMPARISON OF CYANIDE AND THIOSULPHATE …

Before leaching the gold, ore must be crushed and grinded into small particles, usually particle size varies between 30 and 180 μm. Free milling ores are ready for leaching after crushing and grinding whereas refractory ores need pretreatment. It is important to pretreat a refractory ore before leaching to achieve better gold extraction.

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Review of gold leaching in thiosulfate-based solutions ...

The use of ammoniumâˆ'thiosulfate solutions to leach gold and silver from the oxidizing leaching residue of copper sulfide concentrates was reported by BEREZOWSKY and SEFTON in 1979 [25]. The authors claimed that the leaching rate of gold was higher than that by conventional cyanidation and halogen leaching method.

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MURDOCH RESEARCH REPOSITORY - Murdoch University

evaluate the potential benefit from further leaching of residual gold, particularly for secondary heap leaching, through application of cyanide, chlorine, thiourea, thiosulfate and hydrochloric acid. From the experiments conducted it was concluded that the chlorine/chloride system has good potential for further

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Method for thiosulfate leaching of precious metal ...

The leaching time for thiosulfate was 48 h, compared to 24 h for cyanide, but this time difference is not a significant factor for heap, dump, or in situ leaching applications. The higher thiosulfate consumption, which was only twice that of cyanide, is also good, considering this may be offset by 200 j.w. LANGHANS Jr. ET AL. the lower cost of ...

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Characterization of solute transport parameters in leach ...

Heap leaching is essentially a process in which metals are extracted from mine ores with lixiant. For a better understanding and modeling of this process, solute transport parameters are required to characterize the solute transport system of the leach heap. For porous media like leach ores, which contain substantial gravelly particles and have a broad range of particle size …

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Solution chemistry factors for gold thiosulfate heap leaching

Thiosulfate is an alternative lixiviant for the leaching of precious metals. Research and development of thiosulfate leach technology has been prompted by environmental concerns with the use of cyanide and problems associated with the processing of difficult-to-treat ores.

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Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill ...

Thiosulfate is one of alternative reagents to cyanide; many plants still uses cyanide as the primary reagent for gold leaching even though its side effects to environment are well known. While thiosulfate is a potential option, you do need to look at the mineralogy of the deposit.

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Thiosulfate - an overview | ScienceDirect Topics

A combined chemical and biological heap leaching of an oxide gold-bearing ore containing 3.5 g/ton of gold and 14.0 g/ton silver has been reported. One thousand tons of crushed ores (−15 mm) were heap leached in stages. Initial treatment involved alkaline solutions of pH 10–10.5 containing protein hydrolysates and thiosulfate (mixture of ...

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