Strategies For Optimisation of Gold Processing Plants
After 6 hours at 125°C elution is only 80% complete. At 135°C it is 92% complete. At 140°C it is 98% complete when use in conjunction with a closed circuit pressurised electrowinning cell (Baxter and Siddall 1988). The physisorption of gold on to activated carbon is exothermic releasing ~42 J/mole/ 0 C.
اقرأ أكثرUS Patent for Method for recovering gold from activated carbon …
The present invention is intended for effectively removing copper, iron, sulfur, which are impurities, from activated carbon on which gold is adsorbed before gold eluting in the point of view of gold recovery, and is related to a method for eluting gold from an activated carbon on which at least sulfur (S) and gold (Au) are adsorbed, whereas the activated carbon is washed …
اقرأ أكثرACTIVATED CARBON REGENERATION METHOD AND GOLD RECOVERY METHOD
The activated carbon regeneration method according to any one of claims 11, 12, and 13, which is intended for the used activated carbon after elution of the gold from the activated carbon on which the gold has been adsorbed, the activated carbon having been used for adsorption of the gold in a gold-containing liquid, wherein the gold-containing ...
اقرأ أكثرElution of gold from carbon by the micron solvent distillation ...
After analysis for gold, the kinetic activities of these gold- and solvent-stripped carbons were compared with the same carbon stripped according to the Anglo elution procedure. The analytical and kinetic activity results are shown in Table 5 whilst the rates of elution under different presoak and solvent conditions are shown in Fig. 6.
اقرأ أكثرgold elution from activated carbon - avisizano.it
Activated carbon is an adsorbent that increases the concentration of gold in the solution phase For example – An ore containing 3 g t is leached mixed with carbon which loads to 3 000 g t a concentration up of 1 000 times During elution in which the gold is removed from the carbon This is diluted to 300 g t gold in a nbsp.
اقرأ أكثرmethods for carbon reactivation after gold elution
Activated Carbon in Gold Cyanidation. Elution of gold cyanide from activated carbon 73 Unless otherwise specified the pre treatment step was conducted outside the column in glass beakers for 30 min in 20 ml of a 20 g KCN I solution at room temperature After the …
اقرأ أكثرThe mechanism of elution of gold cyanide from activated carbon
Numerous articles have appeared on the mechanism of the adsorption of gold cyanide onto activated carbon. In contrast, little information is available on the mechanism of elution of the adsorbed gold. It is the objective of this article to formulate such a mechanism on the basis of batch and column elution tests without analyzing adsorbed species on the carbon directly. …
اقرأ أكثرUS3920403A - Method of desorbing gold from activated carbon …
Gold in the form of its cyanide complex is desorbed from activated carbon by contacting the carbon with a stripping liquid at temperatures above that 130*C but below the decomposition temperature of the gold cyanide complex. The stripping liquid may comprise water, dilute caustic or dilute caustic cyanide.
اقرأ أكثرAARL Carbon Stripping System Operation: Elution
copper and magnesium which can impede both the elution step and the later adsorption of gold onto the carbon after it has been returned to the CIP circuit. Acid washing of carbon is in fact used as a temporary substitute for thermal reactivation of carbon in some plants. Preheat Stage Buy Gold Stripping & Electrowinning Equipment
اقرأ أكثرUltrasonic elution of gold from activated carbon - ScienceDirect
The Anglo elution procedure ( Davidson and Duncanson, 1977; Davidson and Veronese, 1979) is an alternative approach, which elutes gold in 8–12 h using deionised water at 100–120 °C. In this procedure, the carbon is pre-soaked with 5% w/v NaCN/1% w/v NaOH solution. This process is sensitive to the quality of water used.
اقرأ أكثرElution and Carbon Reactivation - Mineral …
Carbon Fouling & Deactivation. Fouling of carbon with associated deactivation is fairly rapid in CIP circuits. Acid washing and elution only partially reactivate carbon and so for its repeated use, thermal reactivation after each loading is …
اقرأ أكثرmethods for carbon reactivation after gold elution
The mechanism of elution of gold cyanide from activated, Reactivation of the carbon surface occurs when the adsorbed/decomposed cyanide is removed by the eluant At high temperatures of pretreatment, such as used in practice, it is not necessary to include a reactivation term in the mathematical model for elution...
اقرأ أكثرThe mechanism of elution of gold cyanide from activated carbon
The presence of spectator cations (M n+) enhances the formation of M n+ {Au (CN) 2− } n ion pairs on the carbon, which in turn suppress the elution of gold cyanide. The dynamics of removal of these cations determine the horizontal position of the gold peak in an elution profile. When the concentration of cations in the eluant is high and no ...
اقرأ أكثرUltrasonic elution of gold from activated carbon | Request PDF
The elution of gold and silver from activated carbon using organic solvents and the reactivation of the eluted carbon. Report No. 6, Anglo-American Research Laboratories, Johannesburg, South Africa.
اقرأ أكثرComparison of elution methods for carbon loaded with gold …
In this test work, a solution containing 3 % thiourea, 1% NaOH and 0.05 % NaCN was used to elute gold Elution methods for carbon/gold thiourea complex 855 thiourea complex from carbon at 95. Figure 4 shows that the rate of elution is fast. 97 % of the gold was eluted with 20 bed volumes eluant. The eluted carbon assayed 0.17 mg Au/g.
اقرأ أكثرChapter 8
Elution and reactivation - Gold and silver are desorbed from the carbon into a concentrated so1 ution with the stripped carbon being ... Commercial or mine-si te laboratory units can use several carbon adsorption methods to perform the three steps identified above. The paragraphs which follow deal primarily with the loading step and the various ...
اقرأ أكثرThe elution of gold from activated carbon using deionized water
The pretreatment of gold-loaded activated carbon with a relatively strong sodium cyanide solution prior to elution with deionized water at 90 to 125i?½Chas been shown to have a most beneficial effect on the elution of gold. The findings emphasize the important role played by the calcium cation and the hydroxyl anion in effecting efficient elution of gold.
اقرأ أكثرACTIVATED CARBON IN GOLD RECOVERY-22June'12
6 | P a g e to loadings of approximately 12000 g/t carbon. The amount of gold left in solution is 0,2 mg/l. No matter how long the mixing is allowed to continue, no more gold will be
اقرأ أكثرmethods for carbon reactivation after gold elution
Apr 12, 2013 0183 32 >Crusher and Mill >elusion machine for gold recovery, Elution Carbon Reactivation, A number of methods for the recovery of gold from waste ....
اقرأ أكثرReactivation Process of Activated Carbons: Effect on the …
The best reactivation results of the SAC were achieved via acid washing with HNO 3 at 20% v / v and 50 °C over 30 min, and a subsequent thermal reactivation at 850 °C over 1 h. The final reactivated carbon had an iodine number of 1199 mg I 2 /g AC, a k value of 14.9 mg Au/g AC, and a BET surface area of 1079 m²/g.
اقرأ أكثرMETHOD FOR RECOVERING GOLD FROM ACTIVATED CARBON
The present invention is intended for effectively removing copper, iron, sulfur, which are impurities, from activated carbon on which gold is adsorbed before gold eluting in the point of view of gold recovery, and is related to a method for eluting gold from an activated carbon on which at least sulfur (S) and gold (Au) are adsorbed, whereas the activated carbon is washed …
اقرأ أكثرWO2016104113A1 - Method for recovering gold from activated carbon …
The purpose of the present invention is to make it possible: to, before gold is eluted, effectively remove copper, iron, and sulfur, which are impurities from the standpoint of gold recovery, from activated carbon on which gold has been adsorbed; and to efficiently elute the gold. Provided is a method for eluting gold (Au) from activated carbon on which at least sulfur (S) and Au have …
اقرأ أكثرmethods for carbon reactivation after gold elution
nbsp 0183 32 16 The activated carbon regeneration method according to any one of claims 11 12 and 13 which is intended for the used activated carbon after elution of the gold from the activated carbon by using a cyanide solution on which the gold has been 17 . Read more
اقرأ أكثرACTIVATED CARBON IN GOLD RECOVERY - Kemix
There are two methods in which activated carbon is produced: 1. Chemical In which the raw material is mixed with acids such as Phosphoric or Sulphuric acid, dried then heated up to 650 °C. In the Calcination step the impregnated chemicals dehydrate the raw material resulting in charring and creation of a porous structure.
اقرأ أكثرKinetics of elution of gold from activated carbon by zadra method
Show abstract. Dynamic modelling of competitive elution of activated carbon in columns using neural networks. Article. Dec 1995. MINER ENG. Jannie S J Van Deventer. S. P. Liebenberg. Leon Lorenzen ...
اقرأ أكثرReactivation Process of Activated Carbons: Effect on the …
Spent activated carbon (SAC) was obtained from a carbon in pulp (CIP) leaching process for gold extraction. Chemical and physical reactivations were evaluated using several acid-wash procedures (HCl, HNO 3, H 2 SO 4) and thermal treatment (650-950 °C) methods, respectively. The effect of the reactivation processes on the mechanical properties ...
اقرأ أكثرContinuous Elution for Extraction of Gold from Carbon
The continuous elution process is a continuous counter-current system operating in a pressure vessel at elevated pressure and temperature in which both carbon and the eluate are simultaneously moving through each other in opposite directions. During this process the carbon particles enter the top of the vessel loaded with gold and exit barren ...
اقرأ أكثرElution and Carbon Reactivation - Mineral Processing & Metallurgy
Carbon Fouling & Deactivation. Fouling of carbon with associated deactivation is fairly rapid in CIP circuits. Acid washing and elution only partially reactivate carbon and so for its repeated use, thermal reactivation after each loading is essential. Reactivation kilns are basically of two types; rotary kilns and vertical kilns. The use of ...
اقرأ أكثرelution and carbon regeneration in gold processing
Elution and Carbon Reactivation - Resource book. ELUTION & CARBON REACTIVATION 4444 Introduction During the CIL process, gold is leached from the ore using an alkaline cyanide solution. The resulting gold cyanide complex ions are then concentrated and separated from the slurry by adsorbing onto activated carbon.
اقرأ أكثرMethod for recovering gold from activated carbon - Google
The purpose of the present invention is to make it possible: to, before gold is eluted, effectively remove copper, iron, and sulfur, which are impurities from the standpoint of gold recovery, from activated carbon on which gold has been adsorbed; and to efficiently elute the gold. Provided is a method for eluting gold (Au) from activated carbon on which at least sulfur (S) and Au have …
اقرأ أكثرThe elution of gold from activated carbon using deionized
Fig. I-The elution of gold, silver and nickel from activated carbon after pretreatment with 10 per cent potassium carbonate-5 per cent potassium hydroxide. carbonate or the higher pH (hydroxide) was individually responsible for the efficient elution, or whether a strong hydroxide pretreatment in the absence of added carbon- ate would suffice.
اقرأ أكثرGold extraction process by activated carbon adsorption
The process of extracting gold from cyanide pulp or solution by activated carbon adsorption includes CIP method, CIL method and CIC method. A. Gold is adsorbed and leached from cyanide pulp or solution with activated carbon to produce gold-bearing carbon. B. The desorption treatment of gold-loaded carbon makes gold on carbon re-transferred into ...
اقرأ أكثرAu Recovery Using an Activated Carbon Column | SpringerLink
The feasibility of a process involving the use of activated carbon in a multistage column (NIMCIX contactor) for the recovery of gold from unclarified pregnant solutions was investigated on pilot-plant scale. It was found that satisfactory extractions, corresponding to a recovery of 99.6 percent, can be achieved with an average gold concentration of 0.0077 …
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