gold recovery by chlorination

gold recovery by chlorination

(PDF) Gold recovery from WEEE by chlorine system

The experimental results showed that the gold recovery could be over 90 %. For the kinetics analysis of the cementation, the activation energy value was found to be

Read More
Gold Chlorination Processes & Methods

2016-8-31 · Chlorination Process for Gold. This process was based on the fact that chlorine, in the presence of moisture, converts gold into the trichloride AuCl3 , which is soluble in water and removed by washing, the gold being then precipitated by ferrous sulphate, sulphur dioxide, hydrogen sulphide, or charcoal. Coarse gold requires long contact and ...

Read More
Gold extraction by chlorination using a pyrometallurgical ...

The feasibility to recover the gold present in alluvial material, by means of a chlorination process, using chlorine as a reactive agent, has been studied.

Read More
Gold extraction by chlorination using a pyrometallurgical ...

2009-3-1 · The direct chlorination of a pure gold was also studied up to a temperature of 1223 K.These experiments demonstrated that the precious metal is not attacked at that temperature, in agreement with the literature, which indicates that the reaction of direct chlorination of gold is produced at high temperatures (Panias and Neou-Syngouna, 1990).The fact that gold chlorination is reached at lower ...

Read More
The recovery of gold from refractory ores by the use of ...

Recently, the U.S. Bureau of Mines examined the recovery of gold by chlorination of refractory carbonaceous and sulfidic ores, comparing various treatment methods in which a ground ore pulp is contacted with chlorine gas and activated carbon is added to the pulp for a carbon-in-chlorine leach (CICL). The objective of this research was to demonstrate the basic feasibility of CICL technology ...

Read More
Gold extraction by chlorination using a pyrometallurgical ...

2009-12-3 · rine reagent and a simplification of gold separation and purification. The chlorination equipment used in the laboratory has a simple design and permits a safer use of chlorine gas. References Deng, H., Li, X., 1987. Chloride roasting of a complex gold ore and treatment of chlorine fume for precious-metal recovery-experimental results ...

Read More
Recovery of gold from sulfide refractory gold ore ...

2021-11-23 · In this study, A novel method for gold recovery from refractory gold ore was proposed with the purpose of improving recovery efficiency of gold and reducing environmental pollution. The method consisted of two stages roasting for arsenic and sulfur removal, gold recovery by thiourea leaching, followed by an enhanced chlorination roasting for ...

Read More
Gold recovery from refractory gold concentrates by ...

2019-3-1 · process of gold bearing sulfur concentrate consumes a lot of energy and releases pollutants such as SO 2 into the air. Couldn’t achieve a satisfactory recovery by electro-chlorination, Zhu et.al had researched leaching of refractory gold ores by ultrasonic-assisted electro-chlorination, the application of

Read More
Chlorination - an overview | ScienceDirect Topics

Chlorination leaching is used in PGM refineries around the world. Table 29.2 summarizes the feed materials, chlorination conditions, and gold recovery methods and efficiencies within the refinery processes (adapted from information provided in Crundwell et al., 2011).The feedstocks are high-value, low-volume materials often derived from base metal refineries, typically containing ∼25% Pt ...

Read More
The recovery of gold from refractory ores by the use of ...

Recently, the U.S. Bureau of Mines examined the recovery of gold by chlorination of refractory carbonaceous and sulfidic ores, comparing various treatment methods in which a ground ore pulp is contacted with chlorine gas and activated carbon is added to the pulp for a carbon-in-chlorine leach (CICL). The objective of this research was to demonstrate the basic feasibility of CICL technology ...

Read More
Gold extraction by chlorination using a pyrometallurgical ...

2009-12-3 · rine reagent and a simplification of gold separation and purification. The chlorination equipment used in the laboratory has a simple design and permits a safer use of chlorine gas. References Deng, H., Li, X., 1987. Chloride roasting of a complex gold ore and treatment of chlorine fume for precious-metal recovery-experimental results ...

Read More
Chlorine extraction of gold - DUNN; WENDELL E.

The chlorination reaction may be conducted under pressures of 1 to 2 atmospheres, absolute. In order to obtain the maximum recovery of gold from the ore, staged reactors may be used. The amount of chlorine consumed to made gold by-products is small since the amount of gold in the ore is generally small. Excess chlorine is used in the process.

Read More
Gold recovery from refractory gold concentrates by ...

2019-3-1 · process of gold bearing sulfur concentrate consumes a lot of energy and releases pollutants such as SO 2 into the air. Couldn’t achieve a satisfactory recovery by electro-chlorination, Zhu et.al had researched leaching of refractory gold ores by ultrasonic-assisted electro-chlorination, the application of

Read More
Miller Gold Refining Process by Chlorination

2016-3-24 · The pot is allowed to stand under a hood to carry off the fumes until the gold has solidified. The liquid chloride and fluxes are then poured into a mould provided with a hood. The pot is then broken, and the cone of gold dropped into the guard pot, and

Read More
Extraction of Gold

Bromine acts more energetically than chlorine, and has also been employed in the extraction. The recovery of the gold is effected similarly, and the bromine is then liberated by the action of chlorine, but it is impossible to prevent loss of bromine. Cyanide-process The extraction of gold by the cyanide-method is of great technical importance.

Read More
Treatment of refractory carbonaceous sulfide ores for gold ...

Gold recovery by carbon-in-leach cyanidation following chlorination, with 200 pounds of chlorine per ton of ore, is 87%. In this ore, total sulfur is about 2.3%, and sulfide sulfur is about 2.0%. Total carbon is about 0.9%, of which organic carbon is about 0.75%. Iron is about 2.25%.

Read More
A Review on Alternative Gold Recovery Re-agents to Cyanide

2016-8-18 · The importance of gold recovery from low grade ores and flotation tailings is continuously increasing due to raising gold demand and thereby high gold prices. However, due to raising social awareness of the ecological impacts of cyanidic gold

Read More
The leaching and adsorption behaviour of gold ores

2020-8-28 · 1.2 THE RECOVERY OF GOLD BY CY ANIDATION AND CIP/CIL PROCESSING 2 1.2.1 Cyanidation chemistry 2 1.2.2 Adsorption of aurocyanide onto activated carbon 3 1.2.3 Adsorption of aurocyanide at the ore surface 4 1.2.4 CIP/CIL processing of ores 5 1.2.4.1 Cyanide losses during CIP /CIL processing 7

Read More
黄金冶炼氰渣火法处理研究现状及展望-Research Status and ...

Gold is wrapped by iron ore and vein stone, which can be recovered effectively only by pyrometallurgical process. Current pyrometallurgical processes include gold and silver recovery by chlorination volatilization roasting, iron recovery by reduction roasting and magnetic separation, and gold and iron recovery by cyanide slag-copper concentrate combined smelting.

Read More
Gold extraction by chlorination using a pyrometallurgical ...

2009-12-3 · rine reagent and a simplification of gold separation and purification. The chlorination equipment used in the laboratory has a simple design and permits a safer use of chlorine gas. References Deng, H., Li, X., 1987. Chloride roasting of a complex gold ore and treatment of chlorine fume for precious-metal recovery-experimental results ...

Read More
Miller Gold Refining Process by Chlorination

2016-3-24 · The pot is allowed to stand under a hood to carry off the fumes until the gold has solidified. The liquid chloride and fluxes are then poured into a mould provided with a hood. The pot is then broken, and the cone of gold dropped into the guard pot, and

Read More
Chlorine extraction of gold - DUNN; WENDELL E.

The chlorination reaction may be conducted under pressures of 1 to 2 atmospheres, absolute. In order to obtain the maximum recovery of gold from the ore, staged reactors may be used. The amount of chlorine consumed to made gold by-products is small since the amount of gold in the ore is generally small. Excess chlorine is used in the process.

Read More
Extraction of gold and silver in the selective ...

2019-4-9 · The best recovery values were 95.32% of Au and 85.32% of Ag at 1373 K and 1.5 h with 5% KCl. The results show that gold chlorination reaction was controlled by the interfacial chemical reaction, and the apparent activation energy was 40.05 kJ/mol. Silver has an activation energy of about 8.97 kJ/mol, and silver removal is performed by diffusion ...

Read More
SELECTIVE RECOVERY OF GOLD FROM HYDROCHLORIC

2010-11-22 · The paper presents the results obtained in the selective recovery of gold from hydrochloric solutions using Amberlite XAD-7 ion-exchange resin. Experimental tests were conducted on real solutions obtained following selective leaching of gold from different metallurgical wastes, through wet chlorination. It was noticed that the

Read More
Treatment of refractory carbonaceous sulfide ores for gold ...

Gold recovery by carbon-in-leach cyanidation following chlorination, with 200 pounds of chlorine per ton of ore, is 87%. In this ore, total sulfur is about 2.3%, and sulfide sulfur is about 2.0%. Total carbon is about 0.9%, of which organic carbon is about 0.75%. Iron is about 2.25%.

Read More
Recycling gold and copper from waste printed circuit ...

2014-12-24 · Chlorination is a feasible alternative for the recovery of metallic elements due to the higher dissolution rate, non-polluting character and selective leaching of different metals by controlling the redox potential. In the present study, an efficient and less-polluted chlorination process to recycle gold and copper from waste PCBs was investigated.

Read More
(PDF) Gold Extraction and Recovery Processes For Internal ...

Gold Recovery from Solution The common processes for recovery of the solubilized gold from solution are (certain processes may be precluded from use by technical factors) [5,6]: Carbon Adsorption Merrill-Crowe process Electrowinning Ion-exchange/Solvent Extraction (i) Carbon Adsorption The process known as carbon in pulp, or charcoal in pulp or ...

Read More
US5074910A - Process for recovering precious metals from ...

The present invention is a process to recover precious metals from sulfide ores. It involves chlorinating a mixture of an ore concentrate and salt to form a liquid melt. The salt preferably contains potassium chloride. This chlorination is carried out at a temperature between 300° and 600° C. while stirring. The process converts precious metals in the elemental and sulfide forms into ...

Read More
废催化剂中铂族金属回收现状与研究进展 - USTB

2019-11-26 · The Chemistry of Gold Extraction. Littleton: Society for Mining, Metallurgy, and Exploration, Inc., 2006 [27] Shams K, Beiggy M R, Shirazi A G. Platinum recovery from a spent industrial dehydrogenation catalyst using cyanide leaching followed by ion exchange.

Read More