extraction of gold by chlorination

extraction of gold by chlorination

Gold extraction by chlorination using a pyrometallurgical ...

2009-3-1 · Dunn, 1982, Dunn et al., 1991 have extracted gold by chlorination using pyrometallurgical processes at temperatures lower than the ones mentioned above, from refractory minerals and alloys, with a previous roasting process. The objective of this research was, on one hand, to study gold extraction from an alluvial material, through a ...

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Gold extraction by chlorination using a pyrometallurgical ...

2009-12-3 · 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 ...

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The Extraction of Gold by Amalgamation and Chlorination

2019-10-31 · The Extraction of Gold by Amalgamation and Chlorination By RALPH W. BIRRELL University of Melbourne he gold ores found above the waterline in the Lachlan Fold Belt of south eastern Australia in the 1850s, were free milling, meaning that most of the gold could be easily separated from the quartz by crushing, followed by

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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 ...

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(PDF) Gold extraction from pyrite cinders by high ...

Abstract. This study investigated of the extraction of gold from pyrite cinders by means of chlorination at high temperature using calcium chloride as the chlorinating agent. -

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Simultaneous extraction of gold and zinc from refractory ...

2020-4-1 · Trans. Nonferrous Met. Soc. China 30(2020) 1111−1123 Simultaneous extraction of gold and zinc from refractory carbonaceous gold ore by chlorination roasting process Hong-jun WANG1, Ya-li FENG1, Hao-ran LI2, Jin-xing KANG1 1.

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(PDF) Extraction of Gold and Silver in the Selective ...

2017-10-9 · The selective chlorination of cyanidation tailing for the extraction of gold and silver investigated. The reaction operated at different conditions and studied their effect on the extraction of Au ...

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Simultaneous extraction of gold and zinc from refractory ...

2020-4-23 · 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. State Key Laboratory of Biochemical Engineering, Institute ...

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Leach Gold by Sodium Hypochlorite / Chlorine ...

2021-1-19 · A temperature of 24° to 30° C in the chlorination pulps was considered to be near-optimum for gold extraction by subsequent cyanidation. A chlorine addition rate corresponding to 15 hr treatment time with sufficient chlorine for favorable extraction gave the desired residual hypochlorite value of less than 0.2 pct.

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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

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Simultaneous extraction of gold and zinc from refractory ...

2020-4-23 · 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. State Key Laboratory of Biochemical Engineering, Institute ...

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Chlorine extraction of gold - DUNN; WENDELL E.

A process for treating a particulated gold bearing ore to recover the gold therein is disclosed. 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 volatile gold chlorides and volatile gold-iron chlorides in the chlorine off gases followed by condensing ...

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Gold Leaching from a Refractory Gold Concentrate by the ...

Gold Leaching from a Refractory Gold Concentrate by the Method of Liquid Chlorination. Chao Li, Beijing Key Lab of Green Recycling and Extraction of Metals, University of Science and Technology, 30# Xueyuan Road, Beijing, 100083,China ...

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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 ore were investigated.

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Simultaneous extraction of gold and zinc from refractory ...

2020-4-4 · A novel process based on chlorination roasting was proposed to simultaneously recover gold and zinc from refractory carbonaceous gold ore by using NaCl as chlorination agent. The effects of roasting temperature, roasting time and NaCl content on

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Extraction of platinum and gold from copper anode

2020-8-24 · Gold and platinum, as precious metals, have a low chemical activity and show a high ability of resistance to dissolution. Traditionally, a chlorination leaching method is directly used to extract Pt and Au from copper anode slimes, in which the Pt and Au are chlorinated and transferred to acidsoluble PtCl 6 2- and AuCl4

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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

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金矿非氰化浸金研究进展

2020-11-15 · Wang H J, Feng Y L, Li H R, et al. Simultaneous extraction of gold and zinc from refractory carbonaceous gold ore by chlorination roasting process. Trans Nonferrous Met Soc China, 2020, 30(4): 1111 doi: 10.1016/S1003-6326(20)65282-7 [6] Yang T Z, Rao S

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Recovery of gold from carbonaceous ores by simultaneous ...

For this reason and because of the expense of cyanide compounds, the gold extracting industry attempts to reduce or eliminate cyanidation steps in gold extraction methods. One method for eliminating or reducing the degree of the cyanidation step in a gold extraction method is the extraction of the recoverable gold with only a chlorination step.

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Gold recovery from refractory gold concentrates by ...

2019-3-1 · and could improve gold extraction of flotation concentrate treated by oxidative roasting (Xu et al., 2015). Pressure oxidation technology for the treatment of refractory gold concentrates has been deployed in some countries. Shuiyindong gold deposit is one of the Carlin-type deposits which is a typical

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The Chlorination of Gold Ores. - Digitised Collections

2020-2-20 · 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

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Gold Leaching from a Refractory Gold Concentrate by the ...

Gold Leaching from a Refractory Gold Concentrate by the Method of Liquid Chlorination. Chao Li, Beijing Key Lab of Green Recycling and Extraction of Metals, University of Science and Technology, 30# Xueyuan Road, Beijing, 100083,China ...

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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 ore were investigated.

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

Read More

Recovery of gold from carbonaceous ores by simultaneous ...

For this reason and because of the expense of cyanide compounds, the gold extracting industry attempts to reduce or eliminate cyanidation steps in gold extraction methods. One method for eliminating or reducing the degree of the cyanidation step in a gold extraction method is the extraction of the recoverable gold with only a chlorination step.

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5 Methods of Gold-Silver Ore Extraction | Mining Pedia

2020-10-16 · The silver chloride obtained by roasting is easily dissolved in the cyanidation process. But the chlorination roasting has the following disadvantages: 1) The consumption of sodium chloride is large (up to 10~15% of the weight of the material); 2) The chlorides of gold and silver will volatilize and escape, causing the loss of gold and silver.

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金矿非氰化浸金研究进展

2020-11-15 · Wang H J, Feng Y L, Li H R, et al. Simultaneous extraction of gold and zinc from refractory carbonaceous gold ore by chlorination roasting process. Trans Nonferrous Met Soc China, 2020, 30(4): 1111 doi: 10.1016/S1003-6326(20)65282-7 [6] Yang T Z, Rao S

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Recycled Lithium from Simulated Pyrometallurgical Slag by ...

Simultaneous extraction of gold and zinc from refractory carbonaceous gold ore by chlorination roasting process. Transactions of Nonferrous Metals Society of China 2020, 30 (4) , 1111-1123.

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Gold recovery from refractory gold concentrates by ...

2019-3-1 · and could improve gold extraction of flotation concentrate treated by oxidative roasting (Xu et al., 2015). Pressure oxidation technology for the treatment of refractory gold concentrates has been deployed in some countries. Shuiyindong gold deposit is one of the Carlin-type deposits which is a typical

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The leaching and adsorption behaviour of gold ores

2021-12-22 · factor in the enhanced gold extraction in the presence of activated carbon for the ores. Kinetic models were developed for the leaching of gold from the ore, adsorption onto activated carbon and preg-robbing at the ore surface. A variable order empirical model of the Mintek form was used to describe leaching, while adsorption was ...

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