【摘 要】
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Preparation of uncontaminated phosphogypsum (PG),produced by wet process phosphoric acid plant,for using safety in many industrial applications was investigated.The results indicated that,PG is mainly
【机 构】
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Nuclear Materials Authority,P. O. Box 530,El Maadi,Cairo,Egypt
论文部分内容阅读
Preparation of uncontaminated phosphogypsum (PG),produced by wet process phosphoric acid plant,for using safety in many industrial applications was investigated.The results indicated that,PG is mainly composed of calcium sulfate,and contains enhanced natural radioactivity.The activity concentration of 238U,226Ra,2IOPb,232Th as well as 40K in PG samples was measured by y-ray spectrometry.The calculated values of radiation hazardous indices to evaluate the environmental impacts of PG samples were higher than the permissible safe levels.Therefore,the PG should be treated before using in agriculture and/or building materials.This involves the leaching of PG with organic extractant such as TOPO in kerosene.Reduction in the concentration of radioactive nuclides was accompanied by decreasing in the concentration of total rare earth elements (EREE).Using the desired organic extractants under optimum conditions for treatment of the PG waste leads to obtain a decontaminated product that can be safely used in many industrial applications.
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