A method to prepare a high-strength building material from press-formed phosphogypsum purified with waste zeolite
| Autor: | Viktoras Doroševas, Karel Dvořák, Ignacio Villalón Fornés, Danutė Vaičiukynienė, Dalia Nizevičienė |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
0211 other engineering and technologies Building material Phosphogypsum 02 engineering and technology Building and Construction engineering.material Phosphate chemistry.chemical_compound Adsorption Compressive strength chemistry Chemical engineering Mechanics of Materials Impurity 021105 building & construction Architecture engineering 021108 energy Safety Risk Reliability and Quality Zeolite Civil and Structural Engineering |
| Zdroj: | Journal of Building Engineering. 34:101919 |
| ISSN: | 2352-7102 |
| DOI: | 10.1016/j.jobe.2020.101919 |
| Popis: | The production of by-product phosphogypsum is very problematic. In order to recycle the phosphogypsum into a building material, its harmful acidic impurities (especially the soluble phosphate) should be purified, and the mechanical properties improved. Therefore, in this study, a novel method of processing the phosphogypsum is proposed. It consists in the addition of waste zeolite to adsorb the phosphate impurities, and in the application of press-forming processing to improve the compressive strength of the hardened specimens. The zeolite additive has proven to be an efficacious adsorbent, which reduced the soluble phosphate content by 3.2–7.5 times and surprisingly improved the hydration degree of the phosphogypsum. Moreover, the press-forming of phosphogypsum by applying 15 and 20 MPa pressure produced specimens with a compressive strength over 50 MPa. |
| Databáze: | OpenAIRE |
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