chlorination of refractory ore

Refractory Gold | Mining | SGS

The use of chlorine deactivates the carbonaceous matter under strongly oxidizing conditions. However, the consumption and cost of chlorine are prohibitive for many ores ; Blinding and deactivation of the carbonaceous minerals with an organic compound such as kerosene is a cheaper alternative to chlorine and has been tested with many ores.

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CHLORIDE HYPOCHLORITE OXIDATION AND LEACHING …

of the chloride/chlorine lies in the handling. Thus, it is important to select an effective substitute for chlorine. For extraction of gold from the refractory ores in which gold is surrounded by sul-fide minerals, oxidative pretreatment of the ore is essential to oxidize the sulfides and expose gold.

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Extraction of metals from complex sulfide nickel ...

The chlorination selectivity for metals could give guidance to the extraction of metals (especially for valuable metals) either in nickel sulfide ore or other minerals with a complex metal occurrence.

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Process for recovering metals from refractory ores ...

Apr 14, 1992· The present invention is a process to recover metals from refractory ores. It involves the chlorination of an ore concentrate in the presence of solid salt at …

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Roasting (metallurgy) - Wikipedia

Roasting is a process of heating of sulphide ore to a high temperature in presence of air. It is a step of the processing of certain ores.More specifically, roasting is a metallurgical process involving gas–solid reactions at elevated temperatures with the goal of purifying the metal component(s). Often before roasting, the ore has already been partially purified, e.g. by froth flotation.

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

Sep 01, 1990· 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.

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Gold Ore Processing Chlorination In Alamo

Gold Ore Processing Chlorination In Alamo Feb 05, 2013 · The chlorination process of extracting gold From its matrix, and from from concentrates, is freely alluded to in newspapers and amongst miners; and yet, as a rule, the principle is but vaguely understood, even by men who make mining their business.

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Gold extraction by chlorination using a pyrometallurgical ...

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. Transactions Institution of Mining and Metallurgy (C: Mineral Processing Extractive

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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.The optimum conditions were as follows: NaClO concentration of 1.5 mol/L ...

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Chloride-hypochlorite oxidation and leaching of refractory ...

of the chloride/chlorine lies in the handling. Thus, ... Gold telluride ores are important gold refractory ores due to the presence of sulfides and other gangue materials. The classification and ...

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The Role of Chlorine in the Passivation of Preg ... - AusIMM

Analytical, spectrographic, microscopic and electron-optical methods have been applied to demonstrate the proposed mechanism of chlorine-carbon bonding, as well as to evaluate the advantages and limitations of chlorination in the pretreatment of refractory carbonaceous gold ores.

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process gold chlorination - imaigenostredame.be

Patent US5236676 Pressure chlorination of refractory google patents US5236676. A method and apparatus are described for recovering gold from aqueous slurries of refractory gold chlorination of refractory Process for the recovery of gold . Inquire Now [PDF] Recovery of Gold from Alluvial Sand by Wet revistadechimie ro pdf OLTEANU FILCENCO A 2 10 pdf

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NIOSHTIC-2 Publications Search - 10011072 - Carbon-in ...

Chlorination in the treatment of refractory gold ores is applicable in many low-grade gold operations. When usable, this treatment provides an economic means of consuming sulfides and deactivating disseminated organic carbon. Chlorination, however, is a pretreatment technique that requires the neutralization of the

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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 ...

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US5236676A - Pressure chlorination of refractory gold ores ...

A method and apparatus are described for recovering gold from aqueous slurries of refractory gold ores containing sulfidic and/or carbonaceous matter. The method entails pretreating an ore slurry with chlorine in a multi-compartment autoclave operated at an elevated pressure. The chlorine used in this pressure chlorination pretreatment can be in either the gaseous or liquid state.

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Mineral Processing and Extractive Metallurgy Review

Apr 27, 2007· Developments such as heap leaching, in-situ leaching, carbon-in-pulp (CIP), carbon-in-leach (CIL) resin-in-pulp (RIP), and pretreatment of refractory ores …

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The reasons of gold refractory, Gold ore classification ...

Classification of refractory ores. ... If silver is the main economical mental, we can try to use medium preprocessing method, such as chlorination of ore or concentrate ore, soda leaching, and ...

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How to Make 24K Gold | Sciencing

24K gold is the highest purity of gold commercially sold. It has numerous industrial and investment uses, but the term 24K gold is most commonly associated with jewelry. Because gold is an element, it cannot really be made. However, gold can be refined to the 24K …

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How to Leach Gold Ore With Chlorination | Sciencing

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 the ore is 200 mesh or more. 200 mesh means there are at least 200 particles in one square inch of ore.

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Effect of Pretreatment of Sulfide Refractory Concentrate ...

A clear boundary between refractory and non-refractory ore in terms of gold recovery is not well defined, but several authors have pointed out that less than 60% gold recovery by direct cyanide leaching, after fine grinding of mineral indicates a refractory mineral [1]. The refrac- tory ore must be destroyed or attacked by chemical

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Methods of Processing of the Gold-Containing Refractory ...

method for processing the refractory sulfide ore is the method of hydro-chlorination along with thiocar-bamide. As a method of processing the gold-containing tailings of the refractory sulfide concentrates we chose the method of electrochemical oxidation of sulfides in the ore pulp with the use of various chlo-

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Chlorination Leaching of Refractory Ores - Hydrometallurgy ...

Chlorination leaching of floatation concentrate could be a route for treatment of refractory ores instead of roasting, BIOB or POX - some companies are also testing fine grinding and oxygen injection using shear reactors in alkaline cyanide systems. Direct leaching of ores becomes very expensive using chlorine systems.

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gold refractory,ore classification,preprocessing methods

The reasons of gold refractory, ore classification, and preprocessing methods. I. The reason of the gold mineral refractory. There are so many types of reasons that caused the difficulty of gold ore processing, including physical element, chemical element, and mineralogical element. In summary, the difficulties consist of the following ...

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Roasting and chlorine leaching of gold-bearing refractory ...

This paper deals with gold extraction from a refractory concentrate by chlorine leaching. The process considers a pre-treatment of refractory materials by low temperature oxidation carried out with low oxygen concentration. The oxidized material is treated by leaching with brine.

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Titania Tetrachloride Reactor (Chlorinator) Plants ...

Titanium ore in the presence of carbon and chlorine gas will produce titania tetrachloride (TiCl 4) in refractory-lined reactors.Further refinements convert titania tetrachloride into titanium dioxide (TiO 2), a white pigment used for paints.. VISIL ®, a moderate-density, vitreous silica firebrick, offers benefits for reactors and downstream dryers fed with high-purity titanium ore.

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Refractory Gold Ore Treatment Methods

Cyanidation and concentration of gold and silver ores. List Gold Refractory Process Methods. The use of roasting for the oxidation of sulfides has declined over the years. However. Resolute Mining resurrected the Syama project in Mali by converting the process from a whole-ore roast to flotation followed by concentrate roasting.

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NIOSHTIC-2 Publications Search - 10007514 - Refractory Ore ...

An investigation undertaken by the Bureau of Mines examined the recovery of gold by chlorination of refractory carbonaceous and sulfidic ores. Comparisons were made between various treatment methods in which a pulped ore is contacted with chlorine gas and activated carbon is added to the pulp for a carbon-in-chlorine leach (cicl).

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Research on chlorination leaching of pressure-oxidized ...

The main ores of the concentrate are pyrite (FeS2) and arsenopyrite (FeAsS), where gold disseminated in the fine or ultrafine natural gold state. This concentrate is a typical refractory ore, and its gold percent leached is 42.7% when directly chlorination-leached.

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