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  • Gold Ore Roasting Techniques

    A more recent paper, “Roasting of Arsenical Gold Ores and Concentrates” by F. R. Archibald contains a bibliography listing 23 references on the subject of roasting gold and silver ores. There are four general types of roasting furnace in use: the horizontal, multiple-spindle type, of which the Edwards furnace and modifications of it are typical;

  • Roasting. Continued

    Gold forms, at a very low heat, a peculiar chloride which decomposes at a higher temperature, and then remains metallic, except as a portion of it may be again chloridized, in the same form, by chlorine from decomposing base chlorides, during the cooling of the ore, after being withdrawn from the furnace. The gold chloride formed in roasting contains less chlorine than that formed by the cold ...

  • Newbery–Vautin chlorination process - Wikipedia

    According to the nature of the ore, or the size of the grains of gold, this movement is continued from one to four hours, during which time the gold, from combination with the chlorine gas, has formed a soluble gold chloride, which has all been taken up by the water in the barrel. The chlorinator is then stopped, and the gas and compressed air allowed to escape from the valve through a rubber ...

  • Cyanide-free gold leaching in exceptionally mild chloride ...

    10/10/2019  It was found that impurity metals iron and copper originating from the gold ore (Fe 1.6% and Cu 0.05%), were advantageous self-initiating oxidants and 87% of gold could be dissolved in pure calcium chloride (2.8 M) solution. In addition, no bromide, which is a commonly added aggressive additive in modern cyanide-free processes, was required. The lowest chloride concentrations applied

  • How to Leach Gold Ore With Chlorination Sciencing

    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. Grind the ore so that all parts of the ore are open to the HCL mixture. Add your ore to a plastic-tub cement mixer along with 10 pounds of river rock and turn the mixer until ...

  • US8894740B2 - Process for the recovery of gold from an

    A process and system for recovery of gold from an ore having the steps of i) providing the ore containing the gold to be recovered, ii) leaching the ore in an oxidative chloride medium, including a nitrogen species to produce a solution comprising gold; and iii) recovering the gold from the solution. The gold in a preferred embodiment is recovered from refractory and carbonaceous ores.

  • recovery of gold from ores with chlorine in 1898 - Gold ...

    05/02/2013  The gold chloride was washed out of the ore by a stream of water from a tank. The water entered the vat through a pipe at the lowest part and percolated upwards through the ore until the gold content in the solution was extremely low. It was important to take samples of the solution to determine the presence of gold. A sliding door in the bottom of the vat was opened and the residue from the ...

  • US4353740A - Chlorine extraction of gold - Google Patents

    ore gold chloride process iron Prior art date 1981-09-11 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Fee Related Application number US06/301,239 Inventor Wendell E. Dunn Current Assignee (The listed assignees may be inaccurate. Google has ...

  • Gold Chlorination Processes Methods

    Loss of gold by volatilization was recognized from time to time and was the cause of serious monetary loss in treating gold-silver ores by chloridizing roasting, but the reason for this loss seemed to be little understood. In 1891—1893 Croasdale discovered that a commercially complete (above 90%) volatilization of gold could be obtained from Cripple Creek ores by roasting with salt. About ...

  • How to Choose Gold Smelting Flux - Superb

    Zinc Chloride; All of these chemicals perform various functions in the smelting of Gold. Each of them contribute their own specific quota in ensuring that the resulting gold bullion is pure. Below are some of the unique roles played by each kind of flux. Borax. A white crystalline mixture which is in powdered form at room temperature. Borax helps to lower the smelting point temperature of the ...

  • US4353740A - Chlorine extraction of gold - Google Patents

    ore gold chloride process iron Prior art date 1981-09-11 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Fee Related Application number US06/301,239 Inventor Wendell E. Dunn Current Assignee (The listed assignees may be inaccurate. Google has ...

  • Leaching of an oxide gold ore with chloride/hypochlorite ...

    An oxide gold ore was subjected to chloride/hypochlorite leaching at room temperature. The effects of three factors, including Ca(OCl)2 vs. NaOCl, OCl− concentration, and HCl concentration on ...

  • Cyanide-free gold leaching in exceptionally mild chloride ...

    10/10/2019  It was found that impurity metals iron and copper originating from the gold ore (Fe 1.6% and Cu 0.05%), were advantageous self-initiating oxidants and 87% of gold could be dissolved in pure calcium chloride (2.8 M) solution. In addition, no bromide, which is a commonly added aggressive additive in modern cyanide-free processes, was required. The lowest chloride concentrations applied

  • US8894740B2 - Process for the recovery of gold from an

    A process and system for recovery of gold from an ore having the steps of i) providing the ore containing the gold to be recovered, ii) leaching the ore in an oxidative chloride medium, including a nitrogen species to produce a solution comprising gold; and iii) recovering the gold from the solution. The gold in a preferred embodiment is recovered from refractory and carbonaceous ores.

  • Chloride as an Alternative Lixiviant to Cyanide for Gold Ores

    01/01/2016  Chlorine was first used in recovery of gold from its ores in 1851 by Karl Friedrich Plattner, who used metallic iron to cement gold from the chloride leach solution (Aaron, 1881). The barrel chlorination process used chlorine gas generated with bleaching powder and sulfuric acid inside a rotating barrel. In 1863, Plattner's method of chlorination leaching was introduced into gold mines in

  • Procedure for processing sulphide gold containing arsenic ...

    The task is solved in that in the method for processing sulfide gold-arsenic-antimony concentrates and ores, including rihtovanie, roasting, condensation of gaseous compounds of antimony and arsenic, gold leaching of the calcine, according to the invention the mixture is prepared by mixing the concentrate or ore and chloride and/or ammonium fluoride at a mass ratio of 10:0,3-3,0, are firing in ...

  • How to Purify Gold Sciencing

    The unpurified gold ore is fashioned into a 100-ounce anode, whereas pure gold strips make up the cathode. The electrolyte solution is a mix of gold chloride and hydrochloric acid. When an electric current passes from the anode to the cathode through the electrolyte, the gold at the anode dissolves and collects at the cathode. The refinery melts the cathode and casts it into bars of at least ...

  • Leaching of an oxide gold ore with chloride/hypochlorite ...

    An oxide gold ore was subjected to chloride/hypochlorite leaching at room temperature. The effects of three factors, including Ca(OCl) 2 vs. NaOCl, OCl − concentration, and HCl concentration on gold leaching performance were investigated. Due to formation of CaOCl+ complex in solution and hence less reactivity, calcium hypochlorite produces a sluggish gold leaching kinetics, taking twice the ...

  • recovery of gold from ores with chlorine in 1898 - Page 1 ...

    24/10/2013  ClO- species, supplied by the NaOCl). Gold recoveries in excess of 80% were reported for several gold ores when NaOCl concentrations of 1 to 2 gm./litre were employed; however, high NaOCl consumptions (.5 to 1.0 kg./ton of ore) hamper the commercialization of the process."

  • How to Choose Gold Smelting Flux - Superb

    Zinc Chloride; All of these chemicals perform various functions in the smelting of Gold. Each of them contribute their own specific quota in ensuring that the resulting gold bullion is pure. Below are some of the unique roles played by each kind of flux. Borax. A white crystalline mixture which is in powdered form at room temperature. Borax helps to lower the smelting point temperature of the ...

  • recovery of gold from ores with chlorine in 1898 - Page 1 ...

    24/10/2013  ClO- species, supplied by the NaOCl). Gold recoveries in excess of 80% were reported for several gold ores when NaOCl concentrations of 1 to 2 gm./litre were employed; however, high NaOCl consumptions (.5 to 1.0 kg./ton of ore) hamper the commercialization of the process."

  • 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.

  • Chloride as an Alternative to Cyanide - SGS

    concentrates, provides an alternative to cyanide for gold ores. The process generates oxidizing conditions in the autoclave capable of forming the Au. 3+ ion, and gold chloro-complexes result from the addition of small quantities (~5-10 g/L) of sodium chloride to the autoclave. The principles of the PLATSOL ® process are briefly described, and several applications of the process to gold ...

  • Procedure for processing sulphide gold containing arsenic ...

    The task is solved in that in the method for processing sulfide gold-arsenic-antimony concentrates and ores, including rihtovanie, roasting, condensation of gaseous compounds of antimony and arsenic, gold leaching of the calcine, according to the invention the mixture is prepared by mixing the concentrate or ore and chloride and/or ammonium fluoride at a mass ratio of 10:0,3-3,0, are firing in ...

  • Alternative lixiviants to cyanide for leaching gold ores ...

    Grinding the ore with ceramic rather than iron balls was required to prevent cementation of gold chloride (Ferron et al., 2000). The concentrate tested was a flotation concentrate assaying 14.7% Cu, 3.05% Ni, 0.14% Co, 26.7% S, 1.4 g/t Au, 2.2 g/t Pt and 9.9 g/t Pd. Pressureoxidation conditions were 2251C, pulp density 11%, retention time 120 min and oxygen overpressure was 689 kPa. The ore ...

  • Additional of NaCl on Chloride Leaching of Gold Ore from ...

    T1 - Additional of NaCl on Chloride Leaching of Gold Ore from Indonesian Artisanal Mining. AU - Harjanto, S. AU - Pratama, F. W. AU - Lazuardiyani, A. AU - Taris, M. AU - Salam, M. Y. PY - 2019/1/1. Y1 - 2019/1/1. N2 - An alternative method of amalgamation to extract gold in small-scale industries was investigated by means of chloride-ion-based solution leaching. In this study, the addition of ...

  • Leaching of an oxide gold ore with chloride/hypochlorite ...

    An oxide gold ore was subjected to chloride/hypochlorite leaching at room temperature. The effects of three factors, including Ca(OCl) 2 vs. NaOCl, OCl − concentration, and HCl concentration on gold leaching performance were investigated. Due to formation of CaOCl+ complex in solution and hence less reactivity, calcium hypochlorite produces a sluggish gold leaching kinetics, taking twice the ...

  • Gold processing Britannica

    Gold processing, preparation of the ore for use in various products.. For thousands of years the word gold has connoted something of beauty or value. These images are derived from two properties of gold, its colour and its chemical stability.The colour of gold is due to the electronic structure of the gold atom, which absorbs electromagnetic radiation with wavelengths less than 5600 angstroms ...

  • CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING OF

    gold recovery. However, cyanidation after dissolving the ore sample in hydrochloric acid (HCl), sulfuric acid (H 2 SO 4), ferric chloride (FeCl 3) and nitric acid (HNO 3), re-spectively, increased the gold recovery to 98.1%. This shows that the ore is a sulfide refractory gold ore (Saba et al., 2011).

  • Bulk Density Chart

    Ammonium Chloride 38 609 Ammonium Nitrate 49 785 Ammonium Nitrate Pills 38 609 Ammonium Perchloride 62 993 Ammonium Phosphate 55 881 Ammonium Sulphate 69 1105 Amorphous Silica 11 176 Anthracite, Powdered 35 561 Antimony Oxide 44 705 Antioxidant (Granules) 41 657 . Antioxidant (Powder) 28 449 Apple Slices Diced 15 240 Aquafloc 10 160 Arsenic Trioxide 41 657 Asbestos 22

  • 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.

  • chloride roasting complex gold ore - Mining

    Chloride Roasting of a Complex Gold Ore and Treatment of Chloride Fume for Precious-Metal RecoveryExperimental Results. »More detailed. gold ore processing chlorination in Alamo, United States – Gold Gold extraction by chlorination using a pyrometallurgical process chlorine gas. References Deng, H., Li, X., 1987. Chloride roasting of a complex gold ore and »More detailed ...

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  • CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING OF

    gold recovery. However, cyanidation after dissolving the ore sample in hydrochloric acid (HCl), sulfuric acid (H 2 SO 4), ferric chloride (FeCl 3) and nitric acid (HNO 3), re-spectively, increased the gold recovery to 98.1%. This shows that the ore is a sulfide refractory gold ore (Saba et al., 2011).

  • Alternative lixiviants to cyanide for leaching gold ores ...

    Grinding the ore with ceramic rather than iron balls was required to prevent cementation of gold chloride (Ferron et al., 2000). The concentrate tested was a flotation concentrate assaying 14.7% Cu, 3.05% Ni, 0.14% Co, 26.7% S, 1.4 g/t Au, 2.2 g/t Pt and 9.9 g/t Pd. Pressureoxidation conditions were 2251C, pulp density 11%, retention time 120 min and oxygen overpressure was 689 kPa. The ore ...

  • Process for treating refractory gold ores by roasting ...

    Cupric chloride leaching is an attractive alternative for the treatment of pyritic refractory gold ores. In this context, the kinetics of pyrite dissolution was studied in cupric chloride ...

  • chlorine hcl to dissolve gold from ores

    Leaching of an oxide gold ore with , Leaching of an oxide gold ore with chloride/hypochlorite solutions , Chlorine had been used to dissolve gold from ores and , and chlorine as lixiviants for gold. gold ore dissolve - lakshayinstituterohtakin. When combined with hydrochloric acid, the mixture produces chlorine that dissolves gold from gold ore This was the first commercial method used for ...

  • Gold Ore Processing, Volume 15 - 2nd Edition

    Gold Ore Processing: Project Development and Operations, Second Edition, brings together all the technical aspects relevant to modern gold ore processing, offering a practical perspective that is vital to the successful and responsible development, operation, and closure of any gold ore processing operation.This completely updated edition features coverage of established, newly implemented ...

  • Full text of "Roasting of gold and silver ores : and the ...

    Full text of "Roasting of gold and silver ores : and the extraction of their respective metals without quicksilver" See other formats ...

  • PREG-ROBBING OF GOLD IN CHLORIDE-BROMIDE SOLUTION

    activated carbon to the gold ore with carbon addition of 0 (Test 1), 0.01 (Test 2), 0.1 (Test 3), 1 (Test 4), 5 (Test 5), and 10% w/w (Test 6). All the gold chloride-bromide leaching experiments were conducted in a 5 dm3 titanium reactor with baffles and a reflux condenser. The agitator used was of GLS-type. Temperature was adjusted automatically and verified using a thermometer. The acid ...

  • Chemical tests for the metal content of various ores

    Gold: A test known as Darton's is believed to be a valuable means of detecting minute quantities of gold in rocks, ore tailings, etc. "Small parts are chipped from all the sides of a mass of rock, amounting in all to about ounce. This is powdered in a steel mortar and well mixed. About half is placed in a capacious test tube, and then the tube is partly filled with a solution made by ...