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  • Gold extraction by chlorination using a pyrometallurgical

    01-03-2009· The objective of this research was, on one hand, to study gold extraction from an alluvial material, through a pyrometallurgical process, using chlorine gas as a reactant, and, on the other hand, to characterize the initial material and chlorination residues, using X-ray fluorescence (XRF), X-ray diffraction (XRD) and scanning electronic microscopy (SEM) techniques.

    The Chlorination of Gold Ores. Digitised Collections

    The Chlorination of Gold Ores. By Mr. Donald Clark, M.M.E., B.C.E. The ideal method for extracting fine gold would be to dis-solve out the gold with some solvent which would not attack other minerals present. The solvents known 6o years ago were chlorine, bromine, and cyanide of potassium. Yet in

    US4353740A Chlorine extraction of gold Google Patents

    The process includes roasting the ore to remove sulfides as sulfur dioxide followed by chlorination of the ore at a temperature of about 350° C. in the presence of iron to form a mixture of...

    The Extraction of Gold by Amalgamation and Chlorination

    The Extraction of Gold by Amalgamation and Chlorination 21 plates coated with mercury that caught the gold and any silver particles.24 Others followed Agricola and used blankets or cow hides to catch the gold, washing the blankets every few hours to collect the gold and sand particles that were then treated in

    Gold Chlorination Processes & Methods 911 Metallurgist

    31-08-2016· 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

    Gold extraction by chlorination using a pyrometallurgical

    recover gold from alluvial materials by an alternative process such as chlorination, preventing environmental pollution problems gen-erated by gold extraction and concentration by other conventional methods. Extractions of gold close to 99% were achieved, at a temperature of 873 K and at a reaction time of 5400 s, with no significant attack

    Gold Extraction by Chlorination Process YouTube

    24-08-2014· Modern technology has improved the process of using chlorine as a method to dissolve gold. Resin technologies have virtually eliminated the early problems as...

    Gold Bromination & Gold Chlorination= F(Silver)

    16-03-2016· The Solvent: In order to obtain a satisfactory extraction of gold by chlorination or bromination, it is essential to have an excess of reagent over that taken up by the ore. In working on a large scale, it has been found that the consumption of chemicals per ton of

    Extraction of Gold

    As a preliminary step the material is submitted to an oxidizing and chlorinating roasting, to convert metals other than gold into chlorides. After chlorination of the gold, preferably with chlorine under pressure, the metal is precipitated by hydrogen sulphide or ferrous sulphate, or the gold is precipitated by filtration through charcoal, and recovered by combustion of the charcoal.

    Simultaneous extraction of gold and zinc from refractory

    01-04-2020· OJEDA et al [26] investigated the feasibility of the extraction of gold from alluvial material by means of chlorination process, using chlorine as a reactive agent. And the highest recovery of gold was 98.23% at 873 K for 1 h.

    chlorination step by step process of gold extraction

    Gold cyanidation WikipediaGold cyanidation (also known as the cyanide process or the MacArthur-Forrest process) is a hydrometallurgical technique for extracting gold from low-grade ore byKe&chlorination step by step process of gold extraction

    Gold extraction by chlorination using a pyrometallurgical

    Technical Note Gold extraction by chlorination using a pyrometallurgical process M.W. Ojedaa,*, E. Perinob, M. del C. Ruiza a Instituto de Investigaciones en Tecnología Química (INTEQUI), Universidad Nacional de San Luis-CONICET, C.C. 290, 5700 San Luis, Argentina bÁrea de Química Analítica, Universidad Nacional de San Luis, San Luis, Argentina

    Newbery–Vautin chlorination process Wikipedia

    The Newbery–Vautin chlorination process is a process to extract gold from its ore using chlorination developed by James Cosmo Newbery and Claude Vautin.. Background. The process of gold extraction from ores via its absorption in chlorine gas, from which it

    Extraction of gold and silver in the selective

    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 control.

    EFFECT OF OXIDIZING AGENTS IN EXTRACTING GOLD

    Extracting the gold from anode slime had been attempted in the laboratory by applying wet chlorination method. Sodium hypochlorite (NaOCl) and hydrogen peroxide (H2O2) served as the oxidizing agents. Effects of various parameters such as solvent concentration, leaching time and temperature on the percent extraction of gold were studied.

    Extraction of platinum and gold from copper anode slimes

    EXTRACTION OF PLATINUM AND GOLD FROM COPPER ANODE SLIMES BY A PROCESS OF CHLORINATING ROASTING FOLLOWED BY CHLORINATING LEACHING S. Wang a,b,c, L. Li a,b,c,*, S.-D. Wang a,b,c, H. Wang a,b,c, G.-D. Wu a,b,c a* State Key Laboratory of Complex Non-ferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming, China

    Gold Leaching from a Refractory Gold Concentrate by

    “A comparison of alkali and acid methods for the extraction of gold from low grade ores,” Minerals Engineering, 1996. 9(10): 1033–1047 CrossRef Google Scholar 13. Mehdi Ghobeiti Hasab, Shahram Raygan, Fereshteh Rashchi.

    Chlorination Leaching of Refractory Ores

    For those interested in halide lixiviation of gold ores, I found the book by Prof. Thomas Kirke Rose of the Royal School of Mines: The metallurgy of Gold" very informative. Six editions were published between 1890 and 1910. It not only describes chlorination, but also informs on the action of bromine and iodine.

    Recovery of Gold from Incinerated Sewage Sludge Ash by

    In a series of studies into the development of an efficient and selective recovery process for gold that eliminates the need for water, the release behavior of gold from an incinerated sewage sludge ash heated to between 100 and 1000 °C under a chlorine gas stream was investigated. A release of gold was observed above 600 °C, with all gold being transferred to the gas phase at 1000 °C.

    How to Use Bleach on Gold Ore to Remove Gold Sciencing

    24-04-2017· This was the first commercial method used for gold extraction. Place the ore into the mortar and grind it to the size of sand grains. Put the ore grains into a plastic bowl. Add the 35-percent hydrochloric acid to the sodium hypochlorite bleach into a flask or beaker, in a two-to-one ratio of acid to bleach. Ensure that the liquid mixture is at

    How to Leach Gold Ore With Chlorination Sciencing

    25-04-2017· Gold can be leached from stone through alkaline or acidic-based products, including halogens, such as chlorine, iodine and bromine. Halogens are reactive, non-metal elements with seven electrons in their outer shell which allow them to easily

    Gold extraction by chlorination using a pyrometallurgical

    Technical Note Gold extraction by chlorination using a pyrometallurgical process M.W. Ojedaa,*, E. Perinob, M. del C. Ruiza a Instituto de Investigaciones en Tecnología Química (INTEQUI), Universidad Nacional de San Luis-CONICET, C.C. 290, 5700 San Luis, Argentina bÁrea de Química Analítica, Universidad Nacional de San Luis, San Luis, Argentina

    Synergistic extraction of gold from the refractory gold

    A synergistic extraction method for gold from the refractory gold ores via ultrasound and chlorination-oxidation was developed. The effects of solid-liquid ratio, extraction time, ultrasound power, NaClO concentration and NaOH concentration on the extraction rate of gold from the refractory gold

    Extraction of gold and silver in the selective

    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 control.

    Determination of the mechanism of the chlorination of gold

    01-08-1990· Sample Digestion and Combined Preconcentration Methods for the Determination of Ultra-Low Gold Levels in Rocks. Molecules 2019, 24 Chloride–hypochlorite leaching and hydrochloric acid washing in multi-stages for extraction of gold from a refractory concentrate Optimisation of the chlorination of gold in decopperized anode

    Simultaneous extraction of gold and zinc from refractory

    Simultaneous extraction of gold and zinc from refractory carbonaceous gold ore by chlorination roasting process Hong-jun WANG 1, Ya-li FENG, Hao-ran LI2, Jin-xing KANG1 1. School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2.

    Gold Leaching from a Refractory Gold Concentrate by the

    “A comparison of alkali and acid methods for the extraction of gold from low grade ores,” Minerals Engineering, 1996. 9(10): 1033–1047 CrossRef Google Scholar 13. Mehdi Ghobeiti Hasab, Shahram Raygan, Fereshteh Rashchi.

    EFFECT OF OXIDIZING AGENTS IN EXTRACTING GOLD FROM

    Extracting the gold from anode slime had been attempted in the laboratory by applying wet chlorination method. Sodium hypochlorite (NaOCl) and hydrogen peroxide (H2O2) served as the oxidizing agents. Effects of various parameters such as solvent concentration, leaching time and temperature on the percent extraction of gold were studied.

    Processing, smelting and refining gold World Gold Council

    The Miller process uses gaseous chlorine to extract impurities when gold is at melting point; impurities separate into a layer on the surface of the molten purified gold. The Miller process is rapid and simple, but it produces gold of only about 99.5 percent purity. The Wohlwill process increases purity to about 99.99 percent by electrolysis.

    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

    How to Leach Gold Ore With Chlorination Sciencing

    25-04-2017· Gold can be leached from stone through alkaline or acidic-based products, including halogens, such as chlorine, iodine and bromine. Halogens are reactive, non-metal elements with seven electrons in their outer shell which allow them to easily

    extraction of gold by chlorination crusherasia

    Gold extraction by chlorination using a pyrometallurgical process . Introduction. Over the last years, gold recovery has been the central issue in a wide range of studies as a consequence of its high demand and value. Extraction of gold by chlorination mineral processing system

    Synergistic extraction of gold from the refractory gold

    A synergistic extraction method for gold from the refractory gold ores via ultrasound and chlorination-oxidation was developed. The effects of solid-liquid ratio, extraction time, ultrasound power, NaClO concentration and NaOH concentration on the extraction rate of gold from the refractory gold

    EFFECT OF OXIDIZING AGENTS IN EXTRACTING GOLD FROM

    Extracting the gold from anode slime had been attempted in the laboratory by applying wet chlorination method. Sodium hypochlorite (NaOCl) and hydrogen peroxide (H2O2) served as the oxidizing agents. Effects of various parameters such as solvent concentration, leaching time and temperature on the percent extraction of gold were studied.

    How to Use Bleach on Gold Ore to Remove Gold Sciencing

    24-04-2017· This was the first commercial method used for gold extraction. Place the ore into the mortar and grind it to the size of sand grains. Put the ore grains into a plastic bowl. Add the 35-percent hydrochloric acid to the sodium hypochlorite bleach into a flask or beaker, in a two-to-one ratio of acid to bleach. Ensure that the liquid mixture is at

    A Method for Leaching or Dissolving Gold from Ores or

    lurgical gold extraction routes utilize a leaching step to produce a gold-bearing solution as an intermediate product while the recycling of secondary gold from electronic and precious metal scrap is based on the selective and fast dissolu-tion of the precious metal. Therefore, A Method for Leaching or Dissolving Gold from Ores or Precious

    Processing, smelting and refining gold World Gold Council

    The Miller process uses gaseous chlorine to extract impurities when gold is at melting point; impurities separate into a layer on the surface of the molten purified gold. The Miller process is rapid and simple, but it produces gold of only about 99.5 percent purity. The Wohlwill process increases purity to about 99.99 percent by electrolysis.

    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

    Utilization of gold-bearing and iron-rich pyrite cinder

    09-11-2017· The chlorination−volatilization process has been adopted to make full use of gold-bearing and iron-rich pyrite cinder. However, problems of low recovery rate, pulverization of pellets, and ring formation have been encountered during the industrialization of this process. The effects of various parameters on the volatilization rates of valuable metals and on the compressive strength of

    Metal Extraction Through Chlorine Metallurgy: Mineral

    Abstract. Chlorination has been an important process step in the extraction of many nonferrous metals from their ores and concentrates. Some of the important chlorinating agents are gaseous chlorine, hydrochloric acid, ferric chloride, carbon tetrachloride and some alkali or alkaline chlorides like, NaCl, CaCl 2 and NH 4 C1. Because of their high reactivity at a moderate temperature