hypochlorite leaching of gold ore 6821

hypochlorite leaching of gold ore 6821

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

Chloride-hypochlorite technology of leaching of gold from ores and concentrates. We have developed a chloride-hypochlorite technology for leaching gold in an alkaline medium with a pH of 8-8.5. This technology makes it possible to operate the system under less corrosive conditions with a lower chloride concentration and can be used as an ...

(PDF) The Leaching of Gold-silver from Refractory Gold ...

The group of chemicals known as halides is composed of the elements fluorine, chlorine, bromine, and iodine. We will ignore fluorine because it does not

gold refractory,ore classification,preprocessing methods

Leach Gold Ore With Chlorination. Oct 06, 2015nbsp018332if the reading is less than 1000mv you need to add hypochlorite to get it up to 1000mv.when you add hypochlorite you will raise the ph so you will need to add hcl to get the ph back into range.if the redox is less than 1000mv you will start preferentially leaching base metals and will also precipitate out some of the already leached gold.

Advances in Gold and Silver Processing

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 ...

Leach Gold Ore with Chlorination - Gold Refining Forum

The tool was built for comparing scientific articles concerning cyanide-free leaching of gold ores/concentrates/tailings. Altogether, 50 cases of experiments were gathered in a case base. 15 different attributes related to the treatment of the raw material and the leaching conditions were selected to compare the cases.

Flexicone technology for sulfide ores | flexicone

Apr 15, 2020· Two-stage leaching was carried out: first to eliminate manganese from the sample using sodium sulfite (Na 2 SO 3) as a reductive reagent and sulfuric acid (H 2 SO 4) and a second stage to dissolve silver and gold with sodium hypochlorite (NaClO) and hydrochloric acid (HCl); the results show extraction around 96% for Mn and 98.73% and 83% of Ag ...

Assessing the Similarity of Cyanide-Free Gold Leaching ...

The hydrometallurgical leaching of native gold from gold-bearing ores or the dissolution of gold metal during the recycling of electronic and precious metal scrap is performed every day using hazardous chemicals such as sodium cyanide or aqua regia. These chemicals represent health and safety risks for workers and a serious threat for the

Hypochlorite Leaching of Gold Ore | Hydrochloric Acid ...

Apr 30, 2018· Using gold concentrate provided by its partner in Chile, DST was able to evaluate the effectiveness of its technology in a live setting. The company requested proposals from a number of suppliers for onsite sodium hypochlorite generation (OSHG) systems to produce the hypochlorite that is critical to the process.

A Method for Leaching or Dissolving Gold from Ores or ...

Classification of refractory ores. 1. Carbonaceous gold ore. There is organic carbon which can do ' Rob gold ' in gold and silver ore, and it causes that gold is adsorbed in the cyanide solution, make ore difficult to cyanide and leach. Generally, we use roasting …

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

hypochlorite for 2 hours, in order to remove the ... However, few rate expressions which describe the leaching of gold ores have been developed. A model, based on the shrinking-particle model, is ...

Method of gold extraction from sulphide gold-bearing ores

Leaching of an oxide gold ore with chloride/hypochlorite solutions

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

HYPOCHLORITE LEACHING OF GOLD ORE 7 1 Free Milling Gold Ore The free milling gold ore used in this study contains sulphide minerals, such as chalcopyrite and pyrite. Conventional cyanidation resulted in 95 % of the gold being extracted under strong leaching conditions, i.e., a grind of 90 % minus 200 mesh, leach with 1 g5 NaCN at pH 11.0 for

(PDF) Chloride-hypochlorite oxidation and leaching of ...

Keywords: gold leaching, ammonium thiosulfate, chloride, thiourea, thiocyanate Introduction The most common hydrometallurgical methods of primary raw material utilization in the production of gold are based on the use of cyanide (Hilson, 2006). In this method a weak sodium cyanide solution (NaCN) of ppm is used. Since the Baia Mare

Leaching of Trace Amounts of Metals from Flotation ...

Jan 01, 2016· A prefeasibility test on hypochlorite-leaching McDonald Gold Mine oxide ore in Montana gave 68% gold recovery compared with 73% obtained with cyanide (McNulty, 2001). Under the conditions used in their bottle-roll test work (pH 6.5, Eh 1.14 V (vs. SHE)), 33% solids (for 96-h leaching time) reagent consumption was 5.55 kg/t NaOCl and 3.25 kg/t ...

Gold Extraction Method Replaces Cyanide With Non-Hazardous ...

Leaching, often gold, is the process of extracting a soluble constituent from a solid by means of a solvent. In extractive metallurgy, of gold, it is the process of dissolving a certain mineral (or minerals) from an ore or a concentrate, or dissolving certain constituents from materials such as a calcines, mattes, scrap alloys, anodic slimes, etc., to achieve either one or two purposes ...

Gold Metallurgy and Leaching Process

Leaching of Gold A Nikoloski1 and N Stockton2 ABSTRACT Some preliminary results on the secondary leaching of previously heap leached gold ore are presented. Alternative lixiviants for gold comprising chlorine, thiourea and thiosulphate were compared with cyanide using bottle roll tests. Chlorine was subsequently selected for column leaching tests.

(PDF) Kinetic control study of gold leaching with cyanide ...

Leaching experiments of gold and silver from roasted concentrate were carried out using a chlorine-hypochlorite solution. The leaching rate of gold was 75% at 1.5:1 ratio of chlorine and ...

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

Leaching of an oxide gold ore with chloride/hypochlorite solutions

MURDOCH RESEARCH REPOSITORY

In this paper, gold leaching of a refractory sulfide concentrate by chloride–hypochlorite solution was investigated and effects of stirring speed, temperature and particle size on the leaching ...

Hypochlorite Leaching of Gold Ore

Hypochlorite pretreatment of a refractory carbonaceous gold ore showed promise as a method for oxidizing sulfidic and carbonaceous materials prior to conventional cyanide heap leaching. However, previous studies showed hypochlorite consumption is high and gold extraction is proportional to hypochlorite consumption.

Leaching and Adsorption of Gold from Lape-Sumbawa Rocks ...

Oct 24, 2013· From "Advances in Gold Ore Processing" by M.D. Adams: "Pre-treatment of carbonaceous or sulfidic ores by roasting or pressure oxidation is normally required prior to chlorine or bromine leaching to render ores relatively inert, and consequently reduce reagent consumption.

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

Oct 25, 2018· With decreasing ore grades, the tailings of mining operations are becoming of increasing interest as metal-containing secondary raw materials. The objective of the current work was to investigate chloride leaching of gold, copper, cobalt, nickel, and zinc present in the flotation tailings. In the current study, the effect of cupric ion as an oxidant (0–50 g/L) and NaCl (150–250 g/L) on ...