Heating ores to elevated temperatures is called roasting, and it causes the oxygen in the air to convert the sulfur in the ore to sulfur dioxide, which is a gas and is emitted to the air. The process works best when the ore is crushed to small pieces before roasting.
iii ABSTRACT Roasting of double refractory ores found in the Carlin Trend is necessary to oxidize the sulfides and remove the organic matter prior to leaching for gold extraction.
The froth is skimmed off the surface and the enriched ore (mainly the copper mineral) is taken away for roasting. The mixture of water, foaming agent and paraffin is recycled. After this stage the enriched ore now contains about 25% copper by mass and is called copper concentrate.
While this method is applica le to all types of roasting where the elimination of sulphide e sulphur is required,-it is of especial advantags in roasting complex sulphide ores and concentrates containing zinc, lead, copper and iron preliminary to leadsmelting.
Aug 07, 1973· A method of roasting copper-iron-sulphide ore concentrate or mixture, wherein the ratio of sulphur values to copper values is preferably at least one, to yield a calcined product, for the separation a
Recovery of Gold in Pyritic Sulfide Ores The now extinct Us Bureau of Mines conducted numerous studies of gold in pyrite, and sulfide ores over the years, until their untimely demise in the 1990's.
Fluidized-bed roasting The ore particles are roasted while suspended in an upward stream of gas Finely ground sulfide concentrates in size over the range 0.005 to 0.05 cm in diameter is used As in the suspension roaster, the reaction rates for desulfurization are more rapid than in the older multiple-hearth processes.
roasting, it is important that how much sulfur removed and remained in the roasted ore. Seen from Figure 1, the transformation ratio of sulfur dioxide enhanced from 75% to 92% when the roasting temperature ranged from 450˚C to 650˚C.
In roasting, the ore or ore concentrate is treated with very hot air. This process is generally applied to sulfide minerals . During roasting, the sulfide is converted to an …
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 roasting gold and silver ores. There are four general types of roasting furnace in use: the horizontal, multiple-spindle type, of which the Edwards furnace and modifications of it are typical;
Smelting and Roasting Ores to, and As pretreated by two kinds process, oxidizing roasting, roast of concentrates of lead-zinc ores from .... Know More roasting of copper and nickel ore and ore concentrates,
3 Most precious metal deposits are rich in sulfide minerals, Roasting converts these sulfides to smelting-friendly oxides. 4 Tarry hydrocarbons are found in many types of ore deposits. 5 In the middle ages and the early modern period, the term salt referred a whole class of substances
Nickel Smelting and Refining Industry Description and Practices Primary nickel is produced from two very dif- ... processing steps used for the two types of ores. Lateritic Ore Processing Lateritic ores have a high percentage of free and ... handling of ores and concentrates produce wind-borne dust. Liquid Effluents.
The technology is based on a complete sulfur removal by dead-roasting at around 950 °C, followed by the smelting of the dead-roasted concentrate in a DC arc furnace at about 1585 °C.
Copper processing, the extraction of copper from its ores and the preparation of copper metal or chemical compounds for use in various products. In its pure form or as an alloy, copper (Cu) is one of the most important metals in society.
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.
THE ROASTING OF PGM-ORE CONCENTRATES IN A CIRCULATING FLUIDIZED BED 161 Introduction PGM producers predict an increase in PGM-containing, but chromium-rich and sulphur-containing concentrate – a
1.. IntroductionSphalerite present in sulphide ores is the main mineral source for the zinc production (Peng et al., 2005).It is widely distributed in the nature and it is present in a variety of sulphide deposits.
MetallurgicalFurnaces For other industrial reactors and their applications, see →Stirred-Tanc and Loop Reactors, →Tubular ... sand concentrates, zinc- and lead-containing ... From a dominant position as a roasting fur-nace for sulﬁde ores (chieﬂy pyrites in sulfu-ric acid production), the multiple-hearth fur- ...
Pyrometallurgy is a branch of extractive metallurgy. It consists of the thermal treatment of minerals and metallurgical ores and concentrates to bring about physical and chemical transformations in the materials to enable recovery of valuable metals. 
The ConRoast process is based on the removal of sulphur by roasting, followed by smelting of the dead-roasted concentrate in a DC arc furnace, using an iron-based alloy as a collector for nickel, copper, cobalt, and PGMs.
concentrate, which can be smelted to produce a saleable product. Conversely, the late- ... to apply thermodynamic models to the reduction roasting of both a limonitic ore and a ... using carbon as the reducing agent. Additionally, the two ore types are compared in terms of their re-duction behavior and also the simulations of the thermodynamic ...
Lecture 14: Pyro metallurgical extraction (Roasting) Contents Introduction Roasting Sources of energy Determination of calorific value of gaseous fuel Amount of air Types of roasting Conclusions ... In roasting ore concentrate is mixed with for oxidation.
PYRITE ROASTING, AN ALTERNATIVE TO SULPHUR BURNING M Runkel and P Sturm Outotec , Oberursel GERMANY Abstract The roasting of sulphide ores and concentrates is often the first step in the production of metals or chemicals. In many processes, the production of sulphuric acid is viewed as a ... Types of pyrite concentrate .
This paper describes a chloridizing roasting process applied to two types of nickel and copper-bearing sulfide concentrates. One was copper rich and the other nickel rich. The paper gives a full account of the process as investigated in various batch roasters, and in multiple hearth and rotary ...
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.
Roasting is a process of heating of sulfide 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 …
Beneficiation by froth flotation of ore to give copper concentrate (Optional partial roasting to obtain oxidized material or calcines) 2. Two-stage pyrometallurgical extraction ... two ore types can be smelted together to produce matte and a slag with low copper content. Another product is top gas, which contains flue dust. Ores that contain ...
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.
From Stillwater Complex Flotation Concentrate by a Roasting-Leaching Procedure By E. G ... 0,.(> ~ MINES 75TH A~ Report of Investigations 8970 Recovery of Platinum, Palladium, and Gold From Stillwater Complex Flotation Concentrate by a Roasting-Leaching Procedure By E. G. Baglin, J. M. Gomes, T ... concentrates. Ore samples were obtained ...