Sulfur catch fire in open air?

Answer 1

Sulphur (USA Spelling Sulfur) does not have a high level reaction to normal air or oxygen and will not combust on contact with either element. Normally Sulphur (Sulfur) deposits are found naturally in areas around hot springs and in the majority of volcanic regions.

It is also found in nature as iron pyrites (iron sulfide), galena (lead sulfide), gypsum (calcium sulfate), Epsom salts (magnesium sulfate which is used for stomach upsets).

Sulphur (Sulfur) is often recovered for commercial use from underground deposits using the Frasch Process which is basically superheated water and steam pumped underground, where they melt the sulphur (sulfur), is then pumped to the surface.

Sulphur (Sulfur) is also obtained commercially as a by-product of refining crude oil which is why if you pass a refinery you smell that wonderful aroma of rotten eggs.