About Us

MINEVIK Machinery is a leading and pioneering enterprise with the most advanced international level in R&D, manufacturing and selling of large-scale crushing & screening plants and beneficiation plants.

large-scale crushing & screening plants and beneficiation plants.

All of our equipment have got ISO international quality system certification, European Union CE certification and Russian GOST certification.

  • In central China-Zhengzhou, covering 140 thousand square meters
  • Win-win cooperation and create more value to customers
  • Exported large quantities and high-end mobile crushing plant and milling equipments to Russia, Kazakhstan, Indonesia, Ecuador, South Africa, Nigeria, Turkey more than 100 countries .

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Our Products

AS a leading global manufacturer of crushing and milling equipment, we offer including quarry, aggregate, grinding production and complete stone crushing plant. We also supply individual crushers and mills as well as spare parts of them.

Services

Our goal is to guarantee the excellent operation equipment with high safety for our customers and minimize the downtime of the machine by predictive maintenance. Kefid service and original accessories can be 100% trusted at the time of maintenance.

SERVICE AND SUPPORT

Minevik service and original accessories can be 100% trusted at the time of maintenance.

ACCESSORIES CENTER

striving to enable customers to get the parts in the nearest place.

SALES MARKET

Our sales market is spread all over more than 100 countries and regions

thiosulfate gold extraction

Leach Gold using Hyposulphite Of Sodium AKA Thiosulfate

Thiosulfate Gold Extraction The fact that gold will dissolve in sodium hyposulphite solutions is known from the lixiviation of silver and gold ores. The gold will dissolve only in small quantities.

THIOSULPHATE LEACHING – AN ALTERNATIVE TO

and greater efficiency with gold deposits associated with preg-robbing ores. The thiosulphate leaching process, followed by resin-in-pulp gold extraction, has been developed by SGS to the point where it is a technically and economically viable alternative to cyanidation for some gold bearing ore bodies. Whether the leaching is performed in

Thiosulfate leaching of gold A review | Request PDF

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.

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.

Gold extraction Wikipedia

Gold extraction refers to the processes required to extract gold from its ores.This may require a combination of comminution, mineral processing, hydrometallurgical, and pyrometallurgical processes to be performed on the ore.. Gold mining from alluvium ores was once achieved by techniques associated with placer mining such as simple gold panning and sluicing, resulting in direct recovery of

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.

Thiosulfate leaching of gold—A review ScienceDirect

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 gold recoveries can be obtained from the thiosulfate leaching of complex and carbonaceous-type ores. In addition, thiosulfate can be cheaper than cyanide.

Gold Extraction in Carbonaceous Ore using Thiosulfate

Two models were generated from the data to predict gold extraction and thiosulfate consumption as a function of the leaching parameters. The models predicted a gold extraction of 67 pct and reagent consumption of 2 kg S2O3²-/mt ore at 0.25 M S2O3²-, 0.0014 M Cu²+, 0.27 M NH4OH, 0.00625 M SO3²-, and leaching for 16 h.

Extraction of Gold and Copper from a Gold Ore Thiosulfate

The extraction of gold from thiosulfate solutions with amine oxide and its mixture with amines has been studied, the results show that the amine oxide (TRAO) has a higher extraction ability for

Sodium thiosulfate Wikipedia

Sodium thiosulfate is used in gold mining, water treatment, analytic chemistry, the development of silver-based photographic film and prints, and medicine. The medical uses of sodium thiosulfate include treatment of cyanide poisoning and pityriasis. It is on the World Health Organization's List

Ammoniacal thiosulfate leaching of refractory oxide gold

Jul 10, 2017· Various parameters of ammoniacal thiosulfate leaching of refractory oxide gold ore were studied on gold extraction. • The maximum gold extraction of 55% was achieved. • A transition in the process mechanism after a leaching time of 2 h was observed.

Thiosulphate Leaching | Mining | SGS

Thiosulfate leaching offers a number of benefits related to gold recovery yields and environmental concerns: Thiosulfate leaching of gold ores has great potential to reduce the impact on the environment. Unlike cyanide, which is highly toxic, the chemicals used in the thiosulfate leaching process are benign.

Improved thiosulfate leaching of a refractory gold

Base on the above, the thiosulfate leaching of a refractory gold concentrate calcine with several additives including sodium chloride, sodium sulfite, CMC, CMS (sodium carboxymethyl starch) and HA (sodium humic acid) has been studied in this paper to investigate a possible increase in gold extraction and/or decrease in thiosulfate consumption.

US6632264B2 Gold recovery from thiosulfate leaching

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

Sodium thiosulfate Wikipedia

Sodium thiosulfate is used in gold mining, water treatment, analytic chemistry, the development of silver-based photographic film and prints, and medicine. The medical uses of sodium thiosulfate include treatment of cyanide poisoning and pityriasis. It is on the World Health Organization's List of Essential Medicines.

CN101760628B Thiosulfate gold extracting method taking

The invention provides a thiosulfate gold extracting method taking diethylenetriamine as an additive, which is characgerized by comprising the following steps of: adding 0.03-3 mol/dm<3> of thiosulfate leaching agents to ore pulp which is subjected to wet grinding and has the mass concentration of 40 percent by water volume; then adding a diethylenetriamine and copper (II)

Gold leaching by organic base polythionates: new non-toxic

Gold leaching is the key stage in process of gold mining. There are a few well-reputed leaching methods using a variety of different reagents. Nowadays the most popular industrial processes include cyanide, thiourea, and thiosulfate leaching methods.

Sodium Thiosulfate Formula Sodium Thiosulfate Uses

It is an important antidote used for treating cyanide poisoning. Apart from its medical uses, it also has applications in water treatment, neutralizing bleach, leather tanning, gold extraction, photographic processing, and chemical heating pads. Health effects/safety hazards: Sodium thiosulfate is not a toxic material and is used for medical

Gold recovery from refractory gold concentrates by

be exposed. Mohammadi et al. investigated ammoniacal thiosulfate leaching of refractory oxide gold ore, and they obtained maximum gold extraction of 55% (Mohammadi et al., 2017). Shen et al. had researched the direct thiosulfate leaching of gold from refractory ore, and they achieved gold recovery of only 70% (Shen et al., 2013).

Barrick Thiosulfate Leaching of Double Refractory Ore

The purpose of the thiosulfate leaching method is to deliver better gold recovery from double refractory ore. Double refractory ore is comprised of sulfidic and carbonaceous materials. The use of thiosulfate solution combats the preg-robbing process caused by

Recovery of Gold from Thiourea, Thiocyanate, or

Abstract Sodium borohydride can be used as an efficient agent for reducing gold and silver in acidic solutions of thiourea, thiocyanate, thiosulfate, acid chloride, and acid nitrate. The Au(I) ion is reduced to metallic gold in the form of very fine crystals, as indicated by XRD and SEM analysis. The reduction reaction is carried out at ambient temperature for a very short period of

Sodium Thiosulfate: Formula, Properties, Risks and Uses

Sodium Thiosulfate: Formula, Properties, Risks and Uses Sodium thiosulfate is also available as its pentahydrate salt (Na 2 S 2 OR 3 .5H 2 OR). It is an ionic compound formed by two sodium cations Extraction of gold . Sodium thiosulfate is a component used as an alternative leaching agent to cyanide for the extraction of gold.

Golden alternative CSIRO

Mar 05, 2019· Demonstration plant for thiosulfate gold recovery process . The plant will demonstrate CSIRO’s thiosulfate-based recovery process – a non-toxic reagent to dissolve the fine gold out of ores (the gold that is not recovered by gravity) and its application – in the next stage towards its commercialisation.

Gold strike with thiosulphate CSIRO

Gold produced with a cyanide-free thiosulphate process is adding value to a US gold operation. Roger Nicoll reports that the process incorporates patented technology developed through a collaboration between Barrick Gold Corporation and CSIRO.

ALTA MetBytes What's Happening in Gold Ore Processing

CSIRO, Australia, has developed a thiosulfate-based reagent system for gold leaching that has excellent stability and shown broad applicability in the laboratory compared to the thiosulfate system commercially implemented by Barrick to treat double refractory gold ore following pressure oxidation at its Goldstrike Mine in Nevada, USA.

Associated Sulfide Minerals in Thiosulfate Leaching of

Associated Sulfide Minerals in Thiosulfate Leaching of Gold: Problems and Solutions Abstract The effects of some associated minerals on thiosulfate gold leaching were studied through thermodynamic analysis and leaching experiments on composite EFFECT OF GALENA ON GOLD EXTRACTION AND THIOSULFATE CONSUMPTION.....117 FIGURE 5

Gold Recovery from Nickel Catalyzed Ammonium Thiosulfate

Copper catalyzed ammonium thiosulfate leaching process has been proposed as an alternative gold extraction process to cyanidation. In order to recover gold from the ammonium thiosulfate solution, ion exchange process has been proposed as a gold recovery method using strongly basic anion exchange resin.

Gold Extraction and Recovery Processes

Gold Extraction Methods Although new process are being proposed on a regular basis, there have in fact been no dramatic changes in the metallurgical techniques for gold extraction since the introduction of the cyanide process (cyanide leaching or cyanidation) by McArthur and Forrester in 1887 [2]. A basic flowchart for the

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