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Some of the hydrogen sulfide will react with metal ions in the water or solid to produce iron or metal sulfides, which are not water-soluble. These metal sulfides, such as iron(II) sulfide, are often black or brown, leading to the color of sludge. Pyrrhotite is a waste product of the Desulfovibrio bacteria, a sulfate reducing bacteria.
Iron(III) sulfide, also known as ferric sulfide or sesquisulfide (Fe 2 S 3), ... With hydrochloric acid it decays according to the following reaction equation: [4]
Iron sulfide or Iron sulphide can refer to range of chemical compounds composed of iron and sulfur. Minerals. By increasing order of stability: Iron(II) sulfide, FeS;
Although the biological oxidation of reduced sulfur compounds competes with abiotic chemical reactions (e.g. the iron-mediated oxidation of sulfide to iron sulfide (FeS) or pyrite (FeS 2)), [10] thermodynamic and kinetic considerations suggest that biological oxidation far exceeds the chemical oxidation of sulfide in most environments. [4]
The oxidation of the iron sulfide minerals produces sulfuric acid, soluble compounds such as ferric sulfate, and solids such as iron sulfate or jarosite. The iron-based solids produced pose an environmental challenge, as they can release acid and heavy metals to the environment. They can also make later precious metal recovery more difficult.
The oxidation of the sulfide to sulfate solubilizes the ferrous iron , which is subsequently oxidized to ferric iron : 4 Fe 2+ (aq) + O 2 (g) + 4 H + (aq) → 4 Fe 3+ (aq) + 2 H 2 O (l) Either of these reactions can occur spontaneously or can be catalyzed by microorganisms that derive energy from the oxidation reaction.
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Roasting is a process of heating a sulfide ore to a high temperature in the presence of air. It is a step in the processing of certain ores . More specifically, roasting is often a metallurgical process involving gas–solid reactions at elevated temperatures with the goal of purifying the metal component(s).