About: http://webisa.webdatacommons.org/248373634

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	to the furnace, or calcium carbonate or some other alkaline compound, such as dolomite, which reacts with the produced sulphur dioxide so as to form calcium sulphate, i.e. gypsum, or calcium sulphite.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com