E3S Web Conf.
Volume 96, 20192018 6th International Conference on Environment Pollution and Prevention (ICEPP 2018)
|Number of page(s)
|Ecosystem and Solid Waste Management
|28 May 2019
Evaluation of raw and chemically treated waste phosphogypsum and its potential applications
University of Johannesburg, Department of Chemical Engineering Technology, P.O. Box, 17011 , Doornfontein 2088, South Africa
* Corresponding author: firstname.lastname@example.org
A million tons of Phosphogypsum (PG) is stacked in the environment every year and is progressively considered an asset. South African construction industry is expanding as a result of infrastructural developments in the country, the reuse of PG in this industry is considered for recycling and reducing the stacks in landfills. Phosphogypsum is known for its limited ability to use in cement industry due to its phosphorus and radionuclides impurities. This study was conducted to reduce these impurities and investigate the probability of PG application in building and construction. Leaching of PG with citric acid was conducted whereby a relative proportion of P2O5 and radionuclides was reduced in the material, constituents which contributes to strengths reduction. Optimum moisture Contents and maximum dry densities were determined for various PG content mix designs in which Lime and Fly Ash were added to stabilise PG material. The composites were compacted at various moisture contents and cured at low and elevated temperatures of at 40 °C and 80 °C for 4 days. The results obtained shows that for unconfined compressive strengths; the composites produced from PG, and cured at high temperature qualified for the use in construction industry.
© The Authors, published by EDP Sciences 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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