Purification of South African phosphogypsum for use as Portland cement retarder by a combined thermal and sulphuric acid treatment method

dc.contributor.author	Van Der Merwe E.M.	en
dc.contributor.author	Strydom C.A.	en
dc.date.accessioned	2012-11-01T16:31:36Z
dc.date.available	2012-11-01T16:31:36Z
dc.date.issued	2004	en
dc.identifier.citation	South African Journal of Science	en
dc.identifier.citation	100	en
dc.identifier.citation	10-Sep	en
dc.identifier.issn	382353	en
dc.identifier.uri	http://hdl.handle.net/10500/7408
dc.description.abstract	PHOSPHOGYPSUM IS A BY-PRODUCT OF THE manufacture of wet phosphoric acid, and most of it produced in the world goes to waste. The impurities in phosphogypsum greatly restrict its industrial use in Portland cement. We have investigated a method to remove the phosphorus impurities present in South African phosphogypsums, and found that the combination of a thermal and a sulphuric acid treatment was successful in removing most of the harmful phosphorus impurities. Phosphogypsum treated by this means could successfully replace natural gypsum in Portland cement.	en
dc.language.iso	en	en
dc.subject	phosphorus; Phosphogypsum	en
dc.title	Purification of South African phosphogypsum for use as Portland cement retarder by a combined thermal and sulphuric acid treatment method	en
dc.type	Article	en