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of sulfur vapor in roasting gold ores :

Gold Ore Roasting Plant - Mineral Processing Metallurgy

2016-5-31  Ores of sufficient sulfur and carbon content can be treated autothermally. Some ores with low sulfur and carbon contents call for additional heating in order to maintain the roasting reaction. Since the gold content of most ores is low, large amounts need to be treated in order to ensure attractive economics. The goals of the roasting

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Recovery of gold from sulfide refractory gold ore ...

The method consisted of two stages roasting for arsenic and sulfur removal, gold recovery by thiourea leaching, followed by an enhanced chlorination roasting for gold recovery in the presence of ...

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Roasting and Refractory Gold Ore - Manhattan Gold Silver

2014-7-16  During roasting, refractory gold ore is treated with extremely hot air. This causes the sulfites to oxidize, separate from the ore, and become sulfur dioxide. Once all of the sulfides are oxidized, the remaining gold ore can be processed normally. The roasting method has been around for hundreds of years. Prior to the 20th century, the process ...

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Recovery of gold from sulfide refractory gold ore ...

2021-4-1  Typically, gold is encapsulated or finely disseminated in refractory gold ores and the direct cyanidation is not effective for gold extraction from these ores, even after the ore is ground to exceeding small particles (Nazari, 2017, Corrans and Angove, 1991).Especially for sulfide refractory gold ores, in order to recover gold, many oxidation pretreatment technologies were proposed including ...

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Smelting and Roasting Ores to recover gold, silver and ...

2014-6-26  The process works best when the ore is crushed to small pieces before roasting. Additives, such as common rock salt are often added to the mix before it is heated to enhance the reaction of the sulfides. Once the ores are fully roasted, and the sulfur is driven off, the extraction of the gold or silver from the ore is not especially difficult.

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Roasting developments – especially oxygenated roasting ...

2005-1-1  The roasting process is accomplished in two parallel circuits to heat carbonaceous refractory gold ores and oxidize the contained organic carbon and sulfide sulfur. As shown in Fig. 7 , each roaster is comprised of two bubbling, fluid-bed reactors in a single vessel

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ROASTING OF SULFIDE MINERALS - Wiley Online Library

ROASTING OF SULFIDE MINERALS In addition to common metals like copper, lead, zinc, and nickel a number of other ... greater affinity of copper for sulfur than for oxygen. Roasting is essentially a surface reaction where the oxide layer is formed first and ... 3 recovery and of bismuth ores for the removalofAs,SborZn(astheiroxides ...

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Review Pretreatment Process on Refractory Gold Ores

Roasting oxidation inevitably will emit a certain amount of toxic and harmful gases in the process. Microwave roast-ing is a new pretreatment to solve the problem. It uses min-eral absorption properties to heat minerals. In this way, gold, arsenic and sulfur can be separated from ores. The technical advantages of microwave roasting are ...

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A fundamental study of the alkaline sulfide leaching of

2015-12-27  Due to the increasing concerns over the emission of sulfur dioxide from roasting and smelting, there has been an increased interest in pressure oxidation as a means of treating gold bearing ores and concentrates. One of the problems with the partial oxidation of the sulfide host matrix to form elemental sulfur is that

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Pretreatment Process on Refractory Gold Ores with As

Gold ores are considered refractory if gold extractions from a conventional cyanidation process are less than 80% even after fine grinding. 1) Arsenic-bearing refractory gold ore has stones extremely difficult to deal with. In the stones, gold is locked up in arsenic mineral matrix as the form of microscopic or submicroscopic lattice.

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Roasting of Gold Ore in the Circulating Fluidized-Bed ...

Gold roasting is a process, applicable to refractory ores and concentrates that contain sulfide sulfur, organic carbon, and potentially arsenic. Removal of these compounds is necessary to achieve ...

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Process for treating refractory gold ores by roasting ...

2000-2-1  Microscopic gold inclusions in sulfide minerals cannot typically be extracted by conventional cyanidation. The gold ore must be pretreated to oxidize sulfide minerals associated with gold and to remove other minerals and chemical compounds that interfere in the cyanidation leaching process. The recovery of gold from refractory sulfidic-carbonaceous ores after roasting pretreatment was studied.

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(PDF) Conditions and Design Considerations for

Roasting of refractory gold ores has been a commercial process for many years. Improvements in design of fluidised bed roasting technologies and low capital and operating costs compared with other ...

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Gold Ore Roasting Plant - Mineral Processing Metallurgy

2016-5-31  Ores of sufficient sulfur and carbon content can be treated autothermally. Some ores with low sulfur and carbon contents call for additional heating in order to maintain the roasting reaction. Since the gold content of most ores is low, large amounts need to be treated in order to ensure attractive economics. The goals of the roasting

Read More
Review Pretreatment Process on Refractory Gold Ores

Roasting oxidation inevitably will emit a certain amount of toxic and harmful gases in the process. Microwave roast-ing is a new pretreatment to solve the problem. It uses min-eral absorption properties to heat minerals. In this way, gold, arsenic and sulfur can be separated from ores. The technical advantages of microwave roasting are ...

Read More
Roasting of Gold Ore in the Circulating Fluidized-Bed ...

Gold roasting is a process, applicable to refractory ores and concentrates that contain sulfide sulfur, organic carbon, and potentially arsenic. Removal of these compounds is necessary to achieve ...

Read More
A fundamental study of the alkaline sulfide leaching of

2015-12-27  Due to the increasing concerns over the emission of sulfur dioxide from roasting and smelting, there has been an increased interest in pressure oxidation as a means of treating gold bearing ores and concentrates. One of the problems with the partial oxidation of the sulfide host matrix to form elemental sulfur is that

Read More
Separation of Roasted Coating and Core in Double

Abstract. Compared with other pretreatments of sulfur arsenic-bearing gold, double-layered pellet roasting has an advantage that sulfur dioxide and arsenic trioxide volatilizing from this refractory gold ores can be solidified into the coating without emission during the roasting.

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Controlling SO 2 emissions in the roasting of gold ...

Acid pressure oxidation is generally believed to be the most effective pretreatment for refractory sulfide gold ores and concentrates, although it is ineffective for some ores. For such ores and concentrates (usually those containing both carbonaceous and sulfide materials), roasting remains the most effective pretreatment before cyanidation. However, the serious environmental damage that ...

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Effect of Pretreatment of Sulfide Refractory Concentrate ...

2013-12-24  gold in iron sulfide minerals such as pyrite and arsenopy- rite. Such deposits are called refractory gold ores due to the encapsulation of fine particles of gold in the ore host. 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

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Roasting of gold ore in the circulating fluidized-bed ...

Roasting of refractory gold ores has been a commercial process for many years. Improvements in design of fluidised bed roasting technologies and low capital and operating costs compared with other ...

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100th Anniversary Special Paper: Vapor Transport of

2005-11-1  The evolution of fluids leading to high-grade epithermal gold mineralization is initiated by an H 2 S-, SO 2-, Au-, and variably Cu- and As-rich vapor, which separates from an FeCl 2-rich brine in a subjacent porphyry environment. In the early stages of the hydrothermal system, vapor expands rapidly and on reaching the epithermal environment ...

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Roasting of Copper Smelter Feed

2017-6-5  Roasting, the first step in most copper smelters, is relatively inefficient as an arsenic removal process. Multiple-hearth roasters generally remove about 20 percent of the arsenic contained in the feed. Experimental fluidized-bed roasters have been

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Processing technologies for gold-telluride ores

2016-9-12  J. Zhang et al., Processing technologies for gold-telluride ores 3 ing roast, carburizing roast, and sintering or blast roasting. The high temperature can sufficiently decompose the tellu-rides and leave behind the valuable gold residue.

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Development of a Roasting Process for Arsenic Gold

2017-4-29  Development of a Roasting Process for Arsenic Gold-Bearing Concentrates try sulfidation roasting of concentrate in an inert atmosphere (nitrogen or complete fuel combustion products) in an easily sealed installation (shaft reactor or other sealed unit). Pyrite concentrate and elemental sulfur were tried as sulfidizer. Initial materials

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Sulfatizing roasting for copper and cobalt production

2011-11-10  roasting of metal sulfides was already one of the main technologies in the company. Outotec has developed roasting solutions for copper, gold, zinc, lead, molybdenum and pyrite ores. The continuously expanded and upgraded research facilities provide an excellent basis for

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Separation of Roasted Coating and Core in Double

Abstract. Compared with other pretreatments of sulfur arsenic-bearing gold, double-layered pellet roasting has an advantage that sulfur dioxide and arsenic trioxide volatilizing from this refractory gold ores can be solidified into the coating without emission during the roasting.

Read More
Controlling SO 2 emissions in the roasting of gold ...

Acid pressure oxidation is generally believed to be the most effective pretreatment for refractory sulfide gold ores and concentrates, although it is ineffective for some ores. For such ores and concentrates (usually those containing both carbonaceous and sulfide materials), roasting remains the most effective pretreatment before cyanidation. However, the serious environmental damage that ...

Read More
Development of a Roasting Process for Arsenic Gold

2017-4-29  Development of a Roasting Process for Arsenic Gold-Bearing Concentrates try sulfidation roasting of concentrate in an inert atmosphere (nitrogen or complete fuel combustion products) in an easily sealed installation (shaft reactor or other sealed unit). Pyrite concentrate and elemental sulfur were tried as sulfidizer. Initial materials

Read More
Effect of Pretreatment of Sulfide Refractory Concentrate ...

2013-12-24  gold in iron sulfide minerals such as pyrite and arsenopy- rite. Such deposits are called refractory gold ores due to the encapsulation of fine particles of gold in the ore host. 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

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The Role of Magmatic Sulfur in the Formation of Ore ...

This chapter focuses on S in porphyry-type ore deposits, layered-mafic-intrusion-hosted ore bodies, and magmatic sulfide deposits. Porphyry-type ore deposits, e.g., Bingham Canyon, Utah, U.S.A. and Grasberg, Irian Jaya, are important hosts of Cu, Mo, Au, and Ag.

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Recovery of gold from refractory gold ores: Effect of ...

2020-5-28  The extraction of gold from refractory gold ores (RGOs) without side reactions is an extremely promising endeavor. However, most RGOs contain large amounts of sulfide, such as pyrite. Thus, investigation of the influence of sulfide on the gold leaching process is important to maximize the utilization of RGOs. In this work, the effects of pyrite on the stability of the thiourea system were ...

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Processing technologies for gold-telluride ores

2016-9-12  J. Zhang et al., Processing technologies for gold-telluride ores 3 ing roast, carburizing roast, and sintering or blast roasting. The high temperature can sufficiently decompose the tellu-rides and leave behind the valuable gold residue.

Read More
100th Anniversary Special Paper: Vapor Transport of

2005-11-1  The evolution of fluids leading to high-grade epithermal gold mineralization is initiated by an H 2 S-, SO 2-, Au-, and variably Cu- and As-rich vapor, which separates from an FeCl 2-rich brine in a subjacent porphyry environment. In the early stages of the hydrothermal system, vapor expands rapidly and on reaching the epithermal environment ...

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Process for roasting refractory gold ores ...

1994-5-2  Roasting may be effected in an orthodox fluidized bed or a circulating fluidized bed. The use of methanol as a carbonaceous fuel surprisingly results in the fluidized bed in a more complete combustion to form CO 2 and H 2 O. It is believed that the refractory gold ores have a catalytic activity promoting the combustion of methanol.

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Roasting metallurgy Britannica

The most important operations are roasting, smelting, and refining. Roasting, or heating in air without fusion, transforms sulfide ores into oxides, the sulfur escaping as sulfur dioxide, a gas. Smelting ( q.v.) is the process used in blast furnaces to reduce iron ores. Tin, copper, and lead ores

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Biooxidation of High-Sulfur Refractory Gold Concentrate

Gold ores can be categorized into two types-free milling and refractory. Free milling ores are easy to treat. Gold in such ores is recovered by gravity separating techniques or direct cyanidation. Refractory gold ores, on the contrary, are difficult to treat and require pre-treatment prior to cyanidation, such as roasting, pressure oxidation, fine grinding and biooxidation.

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Roasting - A Study on Environmental Aspects, Off-Gas ...

Roasting of sulfide concentrates and refractory ores is an important process step in the production of metals and chemicals. Sulfides of iron, zinc, copper and other metals are oxidised with air between 600 and 1000C into metal oxides or sulfates and gaseous sulfur dioxide. Roasting of gold concentrates and ores is a typical processing step used to produce a porous calcine suitable for cyanide ...

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Gold Extraction from a High Carbon Low-Grade Refractory ...

Subsequently, the roasting of flotation concentrate favorably made the removal rates of carbon and sulfur reach 99.81% and 98.79%, respectively. After roasting, the gold in the roasted product was further enriched to 29.70 g/t and the optimal gold cyanide leaching extraction reached 93.66%.

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