roasting sulfide concentrates for gold

Refractory Gold Ore Treatment 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. The roaster is a circulating fluid-bed unit.

Controlling SO 2 emissions in the roasting of gold concentrate

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. …

Gold roasting technology advances and how to handle …

Refractory gold-ores are characterized by low gold recoveries in direct cyanide leaching. The reasons for low recovery are sulphides, carbon or arsenic due to encapsulation or …

Recovery of gold from sulfide refractory gold ore: Oxidation …

A complete process of gold recovery from sulfide refractory gold ore was proposed. The recovery efficiency of Au was increased by adding pyrite during the …

Dearsenification of gold concentrates via microwave roasting

Arsenic can cause environmental pollution and also affect mineral processing efficiency. To determine the mechanism of separating arsenic from minerals, microwave roasting tests were conducted using Hunan arsenic sulfide gold concentrate as a raw material. The heating behaviour of gold concentrates under microwave irradiation was …

Gold Extraction from a Refractory Sulfide …

Most gold deposits occur associated with sulphides like pyrite and arsenopyrite; thus, precious metal dissolution is possible by oxidizing auriferous sulfide concentrate using simultaneous pressure …

Smelting high sulfides Gold concentrates

Let's guess there are 4 cups in a pound, correct me if I am wrong, my kitchen skills are nonexistent. So 4 cups is one pound times 8 grams Gold per cup so 32 grams per pound of concentrate. Rounding the 32 down to 1 troy ounce you have a concentrate used in the video of 2000 oz per ton. That is a world of difference from 6 oz …

Methods and Equipment for Breaking Down Gold …

Pyrolysis of gold sulfide concentrate with dispensed additives of water vapor and ammonium chloride has significant promise for application: for preparation …

ROASTING OF SULFIDE MINERALS

ROASTING OF SULFIDE MINERALS In addition to common metals like copper, lead, zinc, and nickel a number of other metals such as antimony, bismuth, cadmium, cobalt, mercury, and molybdenum occur as sulfide minerals. Sulfides are not reduced with the most widely used redu-cing agents, carbon and hydrogen, because the free energy change for the ...

Sulfation Roasting of Nickel Oxide–Sulfide Mixed Ore Concentrate …

Sulfation roasting, a common activation technique, is a potential method for cleaner production of nickel from complex low-grade ores. In this study, nickel oxide–sulfide mixed ore concentrate was roasted with the addition of ammonium sulfate under a static air atmosphere, and the roasted products were leached by water, in order to evaluate the …

Roasting of Gold Ore in the Circulating Fluidized-Bed Technology

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 high gold recovery (>90%) during cyanide leaching. Gold roasting is typically a metallurgical fluidized bed process.

Roasting and Refractory Gold Ore

As we have discussed previously on this blog, gold cyanidation can be a very effective means of extracting gold from mined ore. However, the process is ineffective for refractory gold ores – which are made up of sulfide minerals that block the cyanide solution from leaching the gold out of the ore.

Recovery of gold from sulfide refractory gold ore: Oxidation …

Different from traditional high-temperature roasting, concentrated sulfuric acid was used as both an oxidant and leaching agent in a sulfide-encapsulated refractory …

Fluidized roasting-stage leaching of a silver and gold …

Semantic Scholar extracted view of "Fluidized roasting-stage leaching of a silver and gold bearing polymetallic sulfide concentrate" by Bin Xu et al. ... Consolidation in calcines is a common problem in the oxygen-enriched air roasting of refractory gold concentrates containing sulfur and carbon when the initial temperature is greater than …

Gold Ore Roasting Techniques

Roasting of flotation concentrates. The treatment scheme at Lake Shore includes direct cyanidation followed by flotation of the sulphides, roasting of the …

Comparative investigations on sulfidic gold ore processing: …

The gold recovery from the Sand Farming was comparable to POX and roasting. Roasting calcine yielded the gold extraction of 70% while gold extraction from POX residue showed about 90%. ... High grade whole ores or upgraded sulfide concentrates can be processed using POX or roasting processes but the high capital and operating …

Complete process and equipment solutions for refractory …

Outotec can deliver the three main oxidative processes for the treatment of refractory gold concentrates – BIOX, pressure oxidation, and roasting – and …

A clean and efficient innovative technology for refractory …

Specifically, roasting oxidation is a widely utilized method in the pretreatment of sulfide gold ore, aiming to break down the compact sulfide inclusions …

Fluidized roasting-stage leaching of a silver and gold …

The process of fluidized roasting-stage leaching has been developed in this paper to extract silver and gold and their associated metals including copper, zinc and antimony from a complex polymetallic sulfide concentrate. Sintering of the concentrate with high Pb content might be avoided during fluidized bed roasting under appropriate …

Methods and Equipment for Breaking Down Gold-Containing Concentrates

At the same time, roasting gold ores and concentrates is applied at a number of the overseas enterprises. This shows that hightemperature processes remain the main methods for preparing gold-bearing ores and concentrates for leaching. ... Pyrolysis of gold sulfide concentrate with dispensed additives of water vapor and ammonium …

Processing of Refractory Gold-Bearing Sulfide Concentrates…

This review presents an updated data on various technologies for the processing of refractory gold-bearing sulfide concentrates. It primarily focuses on the hydrometallurgical treatment for ...

Recovery of Gold from the Refractory Gold …

However, most of the sulfide minerals in a refractory gold concentrate react to form a harmful gas during roasting and the iron oxide produced during roasting encapsulates invisible or fine gold . Pyrite is …

Leaching of Gold and Silver from a Complex Sulfide Concentrate …

The author compared pretreatments of permanganate oxidation and oxidative roasting on gold cyanidation from a high carbon-, arsenic- and antimony-bearing sulfide gold concentrate and achieved considerable gold extraction . Feng and Deventer used an oxidative ammonia leaching pretreatment to enhance the rate of gold leaching from …

Microwave Pyrolysis Pretreatment of High Arsenic Refractory Gold …

In particular, roasting oxidation is widely used in the pretreatment of low-arsenic-content gold sulfide concentrates. 18,19 However, in the process of roasting oxidation of RGRs, "overroasting," "sintering," and "underroasting" can occur owing to the violent exothermic reaction of sulfide oxidation, and the removal of arsenic is ...

Gold Concentrate Roasting

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Roasting developments – especially oxygenated roasting

The air roasting of concentrates that are refractory because of their high sulfide content has been successful because the process is exothermic at sulfide sulfur concentrations in excess of 15% owing to the heat released on oxidizing the sulfides. ... because the gold is locked within sulfide minerals and the carbonaceous matter …

Roasting of Sulfide Minerals

The chemistry of sulfide roasting is complex involving numerous reactions. Roasting of sulfides, in general, is exothermic and hence the temperature of the ore lump remains high enough for the desired chemical reactions to occur fairly early during the roasting process. This chapter also attempts to demonstrate as to how the …

Recovery of gold from sulfide refractory gold ore: Oxidation …

This research focused on procedures for recovering gold from sulfide refractory gold ore in a clean and efficient way through a sequential separation method. The total recovery efficiency of gold reached 98.06%.

Roasting Developments – Especially Oxygenated Roasting

CFB roasting plant for gold-bearing whole ore. ... Sulfide concentrates were excellent supplemental fuel source, but a consistent supply was difficult to source. In 2010 elemental sulfur or sulfur prill was determined to be the best option for the roaster fuel requirements and temperature control.