【Daily Question】In-depth Processing 20160825: Definition – What is the spontaneous combustion of FeS?
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The phenomenon in which iron sulfide burns when exposed to air is called spontaneous combustion of iron sulfide.
Ferrous sulfide is not a pure substance; it mixes with coke powder, oil residues, and other substances to form scale, and its structure is generally loose. When ferrous sulfide is oxidized in humid air, ferrous ions are oxidized to ferric ions, and sulfur with a valence of -2 is oxidized to sulfur with a valence of +4, releasing a large amount of heat. Due to the local temperature increase, the oxidation of iron sulfide in the surrounding area is accelerated, triggering a chain reaction. If carbon and heavy oil are present in the scale, they will burn rapidly under the action of ferrous sulfide, releasing more heat. This spontaneous combustion phenomenon can easily lead to fire and explosion accidents.
Iron sulfide releases heat when oxidized, and it burns when in contact with carbon or oil
FeS undergoes spontaneous combustion; this combustion is the result of the combined action of three factors: a combustible material, an oxidizing agent, and a ignition point. FeS has strong reducibility; when it oxidizes slowly, heat is released, and the accumulation of this heat leads to an increase in temperature until the ignition point is reached, resulting in spontaneous combustion.
Ferrous sulfide is not a pure substance; it mixes with coke powder, oil residues, and other substances to form scale, and its structure is generally loose. When ferrous sulfide is oxidized in humid air, ferrous ions are oxidized to ferric ions, and sulfur with a valence of -2 is oxidized to sulfur with a valence of +4, releasing a large amount of heat. Due to the local temperature increase, the oxidation of iron sulfide in the surrounding area is accelerated, triggering a chain reaction. If carbon and heavy oil are present in the scale, they will burn rapidly under the action of ferrous sulfide, releasing more heat.
The phenomenon in which a substance can catch fire and burn spontaneously without the need for an open flame
The phenomenon of FeS burning when exposed to air
When ferrous sulfide is oxidized in humid air, ferrous ions are oxidized to ferric ions, and sulfur with a valence of -2 is oxidized to sulfur with a valence of +4, releasing a large amount of heat. Due to the local temperature increase, the oxidation of iron sulfide in the surrounding area is accelerated, triggering a chain reaction.
It refers to the phenomenon in which combustible materials catch fire in air without the presence of an external ignition source, due to self-heating or external heat.
When iron products are corroded by H2S or sulfur at high temperatures, FeS is formed. When FeS comes into contact with air, it undergoes an oxidation reaction that releases a large amount of heat.