As part of the thiosulphate process at Goldstrike, gold-bearing ore is heated as a thick slurry of ore, air, water and limestone in large pressure chambers or autoclaves and then pumped into the ...

Thiosulphate gold leaching has received considerable attention as an alternative technology to the cyanidation of gold ores due to environmental reasons [1] [2]. But the high consumption is the ...

gold ore to 62% with a thiosulphate consumption of 19kg/t.Sulphate addition could not ùnprove the thiosulphate stability significantiy, Gold Ieachmg at high pulp density (62%) produced the same gold extraction and greatiy reduced the thiosulphate consumption to 13kg/t. The mnieral content of the ore dso infiuenced the gold ...

Oxidized gold ores are ... thiosulphate as lixiviant, ferric as oxidant and thiourea as a catalyst for gold oxidation might be usable for anaerobic leaching of gold ores. This work also indicated that the ... IN PLACE LEACHING OF OXIDIZED GOLD DEPOSITS 45 systems under anaerobic conditions. The oxide gold ore

These ores have proven to be amenable to thiosulfate leaching under mild conditions. Gold leaches rapidly as the gold thiosulfate complex, which, because of its low affinity for graphitic carbon, does not suffer the preg-robbing phenomenon that is a feature of these ores in cyanide leach circuits.

Copper-catalyzed thiosulfate leaching is being investigated by the U.S. Bureau of Mines as a potentially economical and environmentally safe method for heap leaching or in situ leaching of low-grade oxidized gold ores. Six variables were investigated in fractional factorial screening tests ...

movable leaching agitation tank plant in azerbaijan india; effective gold leaching and its parameters; extraction of gold by leaching proces; widely gold mine processing equipment gold ore leaching; gold leaching mining machine equations; various thiosulfate gold from black copper ore; gold mining plant double impeller leaching agitation tank ...

Ammoniacal thiosulfate leaching of gold from a refractory ore using a full factorial design. Download. Ammoniacal thiosulfate leaching of gold from a refractory ore using a full factorial design.

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.

gold leaching processing. Accordingly, a number of studies have been carried out to develop a useful and economically profitable process for gold leaching by thiosulphate. Concentrate pretreatment is necessary in thiosulphate leaching process when gold appears in company with sulphidic or carbonaceous ores. They both have the

Gold recovery by catalytic copper ammonium thiosulphate solution has been studied. Such a process strategy is very attractive for leaching certain difficult-to-treat ores and presents lessened lixiviant toxicity compared to cyanide. Newmont Gold Company has evaluated the ammonium thiosulphate heap leach process for gold recovery from low- grade carbonaceous sulphidic refractory ores following ...

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 …

Apr 25, 2017· How to Leach Gold Ore With Chlorination ... The use of chlorine is both the cheapest and most plentiful method for leaching gold. When you mix sodium chloride and hydrochloric acid together, you produce a form of electrolysis that removes gold from rock and soil.

other metallic impurities, namely copper, gold, iron and zinc, is eliminated by choosing an appropriate electrolysis potential. Key Words: Silver recovery, silver extraction, thiosulphate leaching Introduction Precious metals such as gold and silver have traditionally been recovered from ores by leaching with alkaline cyanide solution1−3. By ...

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 ...

Sodium Thiosulphate Gold Leaching. 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 ...

The thiosulphate leaching of gold ores has great potential to reduce the impact on the environment compared to the cyanidation process. Unlike cyanide, which is highly toxic, the chemicals used in the thiosulphate leaching process are benign, and there is great potential to apply the technology in those jurisdictions of the world where the use of

Thiosulphate Leaching Mining SGS. Thiosulfate leaching is a process that recovers gold from ore without the use of cyanide. SGS developed the thiosulfate leaching process because in some jurisdictions, increased regulation pressure means that cyanide cannot be used or transported.

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 deposits associated with preg-robbing ores. The thiosulphate leaching ...

Ammoniacal thiosulphate leaching of gold finds a better substitute as it is non-toxic and environmentally safe as compared to the toxic cyanide system for gold extraction. In the present study, an attempt is made to assess the feasibility of ammoniacal thiosulphate leaching of gold ore …

PDF | In this current study, the extraction of gold from a high grade copper-rich gold ore by copper-assisted ammoniacal thiosulphate leaching was studied by adopting Taguchi L 9, (3 3 ...

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.

Ammoniacal thiosulphate solution allows the solubilization of gold as stable anionic complex. Leaching of gold occurs at appreciable dissolution rates. The aim of this work is devoted to a preliminary evaluation of the feasibility of thiosulphate leaching for the extraction of gold from precious metals ores on a laboratory scale.

Thiosulphate 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 thiosulphate leaching process are benign. This technology offers great potential in those jurisdictions where the use of cyanide is banned outright, or is subject to intense negative ...

A process for recovering gold in which an ore slurry of refractory sulfidic and refractory carbonaceous ore having preg-robbing characteristics due to the presence of organic carbon is subjected to pressure oxidation in an autoclave. The oxidized ore slurry is mixed with a thiosulfate salt lixiviant, which mixture is maintained at a pH between 7 and 8.7 while the slurry is agitated in a ...

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.

As part of the thiosulphate process at Goldstrike, gold-bearing ore is heated as a thick slurry of ore, air, water and limestone in large pressure chambers or autoclaves and then pumped into the new 'resin-in-leach' circuit that takes place inside large stainless steel tanks.

leaching of a gold ore, i.e. EDTA, carboxy methyl odium dodecyl sulfate (SDS) was investigated. EXPERIMENTAL Materials A milled gold ore sample with a solid content of 50% was provided by a gold mine and used in the leaching tests without further treatment. The gold ore sample was a refractory ore mainly containing 6