About: http://webisa.webdatacommons.org/129299507

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	It prevents excessive amounts of clay or barytes or other mineral that may be used from pass ing through the screens, holding it in the pulp.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com.au