Phosphogypsum - source of radionuclides - possibility for removing
2006
Stojanovic, M.,Institut za tehnologiju nuklearnih i drugih mineralnih sirovina, Beograd (Serbia) | Kovacevic, D.,Institut za tehnologiju nuklearnih i drugih mineralnih sirovina, Beograd (Serbia) | Babic, M.,Institut za tehnologiju nuklearnih i drugih mineralnih sirovina, Beograd (Serbia) | Mitrovic, A.,Institut za ispitivanje materijala, Beograd (Serbia)
Preparation of phosphates in phosphoric acid by wet procedure leads to selective separation and concentration of radionuclides. About 80% 226Ra transformes to phosphogypsum, and about 86% uranium and 70% of thorium transforme in phosphoric acid. Practically all radium and progenies of radioactive series of uranium stay in phosphogypsum. Radioactive progeny of the uranium and radium is radon that contaminates the environment according the disposals of the phosphogypsum and construction materials based on phosphogypsum. Beside all this, phosphogypsum deposits are usually built on large area of agricultural land and usually there are no the analysis of the deposit influence on environment. For example, one factory with phosphogypsum production 1000t/24h P2O5 needs, for disposing the phosphogypsum for a period of 20 years, surface of 1.2x1.2 km, with height of the deposit 15 m. Considering this fact, the radioactive danger that appers in the processes of the phosphoric industry is near the danger that exists in mines of uranium. From the other side, radionuclides with anthropogenic origin are in the water solubility or in potentially acceptable form and it is easy for them to include in food chain.
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