Upgrading Phosphogypsum for Uses as Construction Materials
April 29-May 4, 2018
Over 70% of the world’s phosphate rock product is consumed by the “wet” process for production of phosphoric acid, which is mainly used for fertilizer manufacturing. In this process, roughly 5 tons of phosphogypsum (PG) are generated per ton of P2O5 produced. On that basis, at least 150 million tons of PG are being added annually to the world stockpile of billions of tons. Although the Florida style stacking with lining is the state-of- art PG disposal practice and may stay dominant in the phosphate industry for years to come, this practice is neither cost effective nor environmentally sound. The phosphate companies, particularly those in China, are under great pressure to find uses for PG quickly. Use of PG as construction materials could ease the problem significantly. However, due to its high content of P and other gangue materials such as fluorides and silica, this line of PG use is severely limited. Under this research program, a combination of gravity separation with flotation produced an upgraded PG acceptable for many construction uses. The results summarized in Table 1 indicates this.
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Wending Xiao, Dapeng Zhang, and Patrick Zhang, "Upgrading Phosphogypsum for Uses as Construction Materials" in "Beneficiation of Phosphates VIII", Dr. Patrick Zhang, Florida Industrial and Phosphate Research Institute, USA Professor Jan Miller, University of Utah, USA Professor Laurindo Leal Filho, Vale Institute of Technology (ITV), Brazil Marius Porteus, Foskor-Mining Division, South Africa Professor Neil Snyders, Stellenbosch University, South Africa Mr. Ewan Wingate, WorleyParsons Services Pty Ltd., Australia Prof. Guven Akdogan, Stellenbosch University, South Africa Eds, ECI Symposium Series, (2018). http://dc.engconfintl.org/phosphates_viii/39