Laboratory-Scale Sulphation Roasting Testwork for Copper …
This process is generally applied to sulphide minerals. During roasting, the sulfide is converted to an oxide, and sulfur is released as sulfur dioxide, a gas. For the ores Cu2S (chalcocite) and ZnS (sphalerite), balanced equations for the roasting are:- 2 Cu2S + 3O2 → 2 Cu2O + 2 SO2 2 ZnS + 3 O2 → 2 ZnO + 2 SO2 PROCESSES There are several ...
IMPROVEMENT OF SULFATIZING ROASTING OF …
Phase transformations, mechanisms of decomposition, and oxidation of sulphide minerals are ... components during copper-zinc sulphide raw material roasting is modelled using an HSC Chemistry 6.0
(PDF) Leaching of Copper Sulphides
In the ten years from 2003 to 2013 global mine production of copper has increased by over 23% to meet demand while the weighted average head grade has dropped from 0.9 to 0.7% Cu.
Treatment of metal sulphide concentrates by roasting and …
the concentrate was roasted at 1050°C to convert base-metal sulphides to oxides, and the PGMs from sulphide minerals to their elemental states. the roasted concentrate was then treated in a two-stage leaching process. Up to 97% of the platinum, 92% of the palladium, and 99% of the gold were extracted from the roasted concentrate 31 ...
Conventional versus microwave-assisted roasting of sulfidic …
In this study, sulfidic tailings of Neves Corvo Cu-Zn-Pb-mine (Portugal) underwent conventional roasting (CR) and microwave-assisted roasting (MR) to compare the effect of …
Chapter 2 Roasting of Sulfide Minerals
In flash roasting, the preheated ore is injected through a burner. This process is most appropriate for the roasting of sulfides, which oxidize exothermally and require no additional fuel. In flash roasting, the benefits of a counter flow operation are partially lost. The use of fluidized beds for roasting fine concentrate is obviously ...
Sulfation Roasting of Copper Sulfide Concentrates: Re
Most of the past attempts by plant operators and many researchers to apply sulfation roasting to primary sulfide minerals, including bornite and chalcopyrite, have generally failed. The obstacle to success has been formation of the acid-insoluble copper ferrite. The only sulfation roasting and roaster calcine leaching project that has ever ...
Differentiate between calcination and roasting.
In the process of roasting, ore is heated above its melting point in the presence of air or oxygen while in calcination, ore is heated above its melting point in the absence of air or very limited amount of oxygen supply. 2. Roasting is mostly done for sulphide minerals while calcination is mostly applied in decomposition of carbonate ores. 3.
Phase transformation and roasting kinetics of cobalt-rich …
Cobalt is usually recovered as a by-product of copper extraction [14].There is a large amount of cobalt element in African cobalt-rich copper sulfide ore (CRCS), and the copper to cobalt ratio in the mineral is up to 3:1, which means that cobalt is highly enriched [15].Carrollite (CuCo 2 S 4) is the main load mineral of cobalt in CRCS, due to the dense structure of …
Optimized roasting of complex copper sulphide …
Boliden Mineral AB, Semtech Metallurgy AB, LTU Project duration - ... Roasting of complex sulphide concentrates have potential to remove minor elements through vaporisation. Detailed knowledge of minerals and mineral composition will facilitate an optimized roasting process.
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 ...
Recovery of gold from sulfide refractory gold ore: Oxidation roasting …
Therefore, sequential removing As and S from the sulfide refractory gold ore were achieved successfully under the following conditions: First stage roasting to remove As, temperature 500 ℃, air flow rate 10 mL/min, roasting time 45 min; Second stage roasting to remove S, temperature 650 ℃, air flow rate 100 mL/min, roasting time 60 min. XRD ...
Roasting of Sulfide Minerals
Download Citation | 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 ...
Improvement of Sulfatizing Roasting of Refractory Copper-Zinc Sulphide
Catalytic sulphation roasting of a complex sulphide concentrate (Kirki, Greece) containing 35.3% Zn, 15.1% Pb and 8.6% Fe, was carried out to sulphate zinc and lead and transform iron sulphides to ...
The leaching of sulphide minerals in chloride media
In this regard, LEACHING SULPHIDE MINERALS IN CHLORIDE MEDIA 19 TABLE 2 Recent fundamental studies on the leaching ofchalcopyrite in FeCI3 media Material Reference Conclusions Natural chalcopyrite 54 single crystal Natural chalcopyrite 55 single crystal Natural high purity, massive chalcopyrite Natural chalcopyrite sawn massive and powders ...
Gold Ore Roasting Techniques
A comprehensive description of roasting practice is to be found in a series of articles entitled "Roasting Gold-Silver Sulphide Ores and Concentrates" by M. W. von Bernewitz. 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 ...
Optimization of microwave-assisted roasting: Box-behnken …
Previous research confirmed that the highest temperature for roasting gold sulfide ore was achieved at a water composition of 9 % [85]. ... Promoting the oxidation of sulfide minerals facilitates the formation of sulfate compounds, thereby minimizing the emission of sulfur gas to the environment. By controlling the temperature, further ...
Roasting of Sulfide Minerals
In the extraction of metals from sulfides, roasting is applied to achieve different objectives depending on the overall process flow sheet. Such objectives include one or more of …
ROASTING OF SULFIDE MINERALS
In roasting, air in large amounts, sometimes enriched with oxygen, is brought into contact with the sulfide mineral concentrate. This is done at elevated temperatures when oxygen combines with sulfur to form sulfur dioxide and with the metal to form oxides, sulfates and so on.
Lecture 15: Thermodynamics of roasting Contents
Roasting of complex sulphide ores Technology of roasting Conclusions Reference Key words: roasting, dead roasting, Predominance area diagram Preamble Roasting is gas/solid reaction in which sulphide is converted to oxide or sulphate or even to metal. Whether roast product is oxide or sulphate or partially sulphide would depend on temperature and
(PDF) Sulfide Mineral Roasting for Metal Extraction
The combined methods involving low temperature roasting of sulfide copper minerals with potassium chlorides without the formation of sulfurous gases and their evolution into the …
Method of roasting sulphide minerals
sulphide minerals roast ferrites Prior art date 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 - Lifetime Application number US111652A Inventor Read John Burns Melville F Coolbaugh
US5254320A
A method for roasting sulphide ores or ore concentrates containing precious metals is practiced in a furnace, typically in a fluidized bed. The ore and a sulphur-binding lime-containing material are supplied to a roasting furnace in which the ore is roasted with the emission of heat and sulphur dioxide. The lime-containing material--such as calcium hydroxide--is mixed into the cooling …
ALTA Gold 2012 E-Doc
concentrate for high sulphide recovery discussed below indicated that the silver minerals do not correlate directly with the sulphide minerals. The slow leaching kinetics of at least half the silver could be due to the association of silver with the mineral acanthite (Ag 2S) which is slow leaching. 10 100 1000 10000 100000 0.10 1.00 10.00 100. ...
Roasting in Metallurgy
Chemistry of Oxidising Roasting. Sir Wm. Roberts- Austen discusses as follows the roasting of a "mixture consisting of sulphides mainly of iron and copper, with some sulphide of lead, small quantities of arsenic and …
sbm/sbm mineral roasting process and equipment.md at …
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
The natures of zinc sulfide concentrates and its …
This process is generally applied to sulfide minerals. During roasting, the sulfide is converted to an oxide and sulfur is released as sulfur dioxide, a gas. For the ores that consist of Cu2S (chalcocite) and ZnS (sphalerite), balanced equations for …
Theory and Practice of Roasting Sulphide Concentrates
Hence, roasting is a chemical process.The object of roasting is, by changing, chemically, mineral constituents of sulphide ores, to make the economic recovery of the desired •Constituent metal …
Microwave roasting of a carbonaceous sulphidic gold concentrate
The sulphide minerals present were; arsenopyrite (FeAsS), pyrite (FeS) and pyrrohtite (FeS). Muscovite (KAl 2 (AlSi 3 O 10)(F,OH) 2) and chlinochlore (Fe,Mg,Al) 6 (Si,Al) 4 O 10 (OH) 8 were also detected. ... In both roasting processes, the sulphide sulphur was readily eliminated. Due to the high temperatures generated in microwave heating ...
Isothermal Sulphation Roasting of Nickel Sulphide …
Isothermal Sulphation Roasting of Nickel Sulphide Minerals … 225. reaction interface during the oxidation of sulphides. However, Figs. 4c and d show significant liquid phase sintering morphology. This morphology may be due to the fact that after the addition of sodium sulphate, an intermediate liquid phase was