Sulfur dioxide (SO2) is a major air pollutant emitted in the roasting, smelting and converting of sulfide ores (nickel sulfide concentrates contain 620% nickel and up to 30% sulfur). Sulfur dioxide releases can be as high as 4 metric tons of sulfur dioxide per metric .
· Normally, however, roasting decomposes the tellurides but there is some evidence which suggests that the volatility of telluriates leads to gold plating in the roaster. In general, refractory gold ores may be treated in a number of ways and over the past few years, 5 approaches have been taken, all with varying degrees of success depending on the ore.
also sulphurcontaining feeds. Generally speaking, there are three steps in the pyrometallurgical primary copper production process: roasting of ores to remove sulphur; smelting of roaster product to remove a part of the gangue for production of the copper matte; and converting the copper matte to blister copper.
Aiming at these problems, we present a new method of sulfurfixing roasting of antimony sulfide. This method uses ZnO as a sulfurfixing agent, and roasting with Sb 2 S 3 was carried out at 673 K~1073 K to produce Sb 2 O 3 and ZnS. By calculating the thermodynamics of the reactions, we can conclude that the Gibbs Free Energy Change (ΔGθ) of ...
Gold Ore Roasting Plant Mineral Processing Metallurgy. Insitu capture of SO2 in the presence of lime/limestone, ore dolomite. At Cortez Gold Mines in Nevada, the first Lurgi CFB roaster for whole ore roasting has been installed for calcining 90 st/h of gold bearing refractory ore. The ore contains % sulfide sulfur, % . Get Price
sulfur feedstock used, the strength of acid produced, and the conditions in the absorber. Because it contains virtually no water vapor, bright elemental sulfur produces little acid mist when burned. However, the hydrocarbon impurities in other feedstocks (i. e., dark sulfur, spent acid, and hydrogen sulfide) oxidize to water vapor during ...
sulfur in fuels or roasting pyrite (FeS 2) or sulfide ores of metals such as zinc, copper, lead, etc. The major sources of SO x emissions are fossil fuel fired power plants and boilers, metal ore smelters, oil refineries and transportation. Smaller stationary combustion sources such as coal burning for domestic heating also contribute to the
world gold conference brisbane, qld, 26 ˜ 29 september 2013 conditions and design considerations for maximising recoverable gold in roasting of refractory gold ores
Gold resources on Earth result from an exceptional concentration phenomenon yielding metal contents in ore a thousand to a million times higher than those in common rocks. We show that this process is controlled by sulfur radical ions (S− 3), which strongly bind Au .
About 93 to 97 percent of the sulfur in the feed is emitted as sulfur oxides. Concentrations of SO2 in the offgas vary with the type of roaster operation. Typical SO2 concentrations for multiple hearth, suspension, and fluidized bed roasters are to percent, 10 to .
Sulphur and Sulphuric Acid Conference 2009 M Runkel and P Sturm _____ Page 101 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 1953, Calera was originally developing a roastleach process for their ore, ... Figure 2: General flowsheet of processing refractory gold ores using pressure oxidisation . 3 ... whole ore as feed based on sulfur grade and operating and capital expense.
EXTRACTING METALS FROM SULFIDE ORES. Many important metals are present in nature combined with sulfur as metal sulfides; these include cadmium, cobalt, copper, lead, molybdenum, nickel, silver, and zinc. In addition, gold and platinum group metals are associated with sulfidic base metal ores. The extraction of metals from their ores has been an ...
ores and break up their physical structure, allowing leaching solutions to penetrate and dissolve the gold. Roasting oxidizes the sulfur in the ore, generating sulfur dioxide that can be captured and converted to sulfuric acid. Roasting temperatures are dependent on the mineralogy of the ore, but range as high as several hundred degrees Celsius.
are driven by the gold recovery rate. The pretreatment of refractory gold ore should increase the gold recovery rate in the cyanide leach process by 3040% in order to be economical" "Large operations tend to choose roasting or pressure oxidation, while smaller operations tend to select bacterial leaching," says Dr Fleming. "Other
The ore bodies: Coka Marin, Tenka and Blagojev Kamen, in Eastern Serbia, contain polymetallic sulfide minerals rich in precious metals: silver and gold. Basically, these minerals contain: chalcopyrite, CuFeS2, pyrite, FeS2, as well as lead and zinc sulfide. Oxidation roasting of sulfide compound is the first stage of processing sulfide ...
In most published hydrothermal ore deposit models, the main agent of metal transport is an aqueous liquid. However, there is increasing evidence from volcanic vapors, geothermal systems (continental and submarine), vaporrich fluid inclusions, and experimental studies that the vapor phase may be an important and even dominant ore fluid in some hydrothermal systems.
Hint: Gold ore contains impurities like sulfide sulfur, organic carbon, and arsenic. Roasting of Gold ore is a process, to remove the impurities present in it to get pure Gold (Au). Removal of these impurities is necessary to attain high gold recovery (>90%) by cyanide leaching process.
the goldrich porphyrytype ore deposit at Grasberg, Indonesia, that yield a calculated partition coefficient for gold between vapor and brine of D Au v⁄b 39. Heinrich et al. (1999) cite the preferential partitioning of sulfur into vapor relative to brine (Drummond and .
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