Study on anhydrite plaster from waste phosphogypsum for use in polymerised flooring composition |
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| Affiliation: | 1. College of Mining, Guizhou University, Guiyang, 550025, China;2. National & Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas, Guiyang, 550025, China;3. Guizhou Key Laboratory of Comprehensive Utilization of Non-metallic Mineral Resources, Guiyang, 550025, China;1. Key Laboratory of Ministry of Education for Solid Waste Treatment and Resource Recycle, Southwest University of Science and Technology, Mianyang, 621010, China;2. Sichuan Engineering Lab of Non-metallic Mineral Powder Modification and High-value Utilization, 621010, China;1. Kaunas University of Technology, Lithuania;2. Główny Instytut Górnictwa (GIG), Poland;1. Universidade Federal do Rio Grande do Sul, Av. Osvaldo Aranha 99, Centro Histórico, Porto Alegre/RS, CEP. 90035-190, Núcleo Orientado para a Inovação da Edificação (NORIE), Brazil;2. Universidade Federal de Santa Maria - Av Roraima 1000. Prédio 10A (Centro de Tecnologia CT), CEP 97105-900, Camobi, Santa Maria/RS, Brazil;3. InterCement, Av. das Nações Unidas, 12.495, São Paulo SP, Brazil |
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| Abstract: | The paper deals with an investigation about the production of high strength plaster from the waste phosphogypsum and its use in making flooring tiles. To achieve this objective, phosphogypsum was calcined at 900–1000 °C to anhydrite which was mixed with suitable chemical activators (alkali/alkaline earth hydroxides, sulphates, carbonates) and finely ground (>400 m2/kg Blaine's) to achieve high compressive strength (36–37 MPa). The anhydrite plaster was blended with 2–3% of predetermined quantity of a monomer methyl methacrylate (MMA) with a compatible catalyst, metalic oxide pigments, fly ash or red mud, chopped glass fibres (E-type, 12 mm long) and quartz sand to form flooring tiles by vibration moulding technique followed by high humidity curing, drying, grinding and polishing. The addition of chemical activators increase the rate of dissolution of anhydrite for rapid transformation into hard strong gypsum matrix while the MMA gets polymerised during hydration of anhydrite into polymethyl methacrylate which fills up voids and pores of hydrating anhydrite and thus improves density, strength and durability of the anhydrite plaster against water. The durability of anhydrite plaster by alternate wetting and drying and heating and cooling cycles is reported along with hydration mechanism. The use of phosphogypsum anhydrite for making high strength plaster and flooring tiles is recommended. |
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