STP861: Evaluation of Radium and Toxic Element Leaching Characteristics of Florida Phosphogypsum Stockpiles

    May, A
    Research chemist and supervisory mining engineer, Tuscaloosa Research Center, Bureau of Mines, AL

    Sweeney, JW
    Research chemist and supervisory mining engineer, Tuscaloosa Research Center, Bureau of Mines, AL

    Pages: 20    Published: Jan 1984


    Abstract

    The U.S. Bureau of Mines conducted studies to determine if phosphogypsum, a waste material from the processing of phosphate rock, contains hazardous toxic materials as defined by the Environmental Protection Agency (EPA) and whether leaching of these toxic materials and radium may occur. Samples of the phosphogypsum stockpiled material were evaluated using the EPA extraction procedure, atomic absorption, neutron activation, X-ray diffraction, and chemical and physical means. Radiological tests performed used both the germanium-lithium and emanation methods. The data show that the phosphogypsum stockpiles are not hazardous toxic waste as defined by EPA criteria. Trace elements and radium are not leached from the phosphogypsum stockpiles. Absorption of trace elements and radium by phosphogypsum is the major reason for their not being leached. The standard error of measurement of radium concentrations was 4.7 pCi/g.

    Keywords:

    gypsum, phosphoric acids, radium, byproduct gypsum, phosphogypsum, hazardous waste, phosphate fertilizer production


    Paper ID: STP30277S

    Committee/Subcommittee: C11.01

    DOI: 10.1520/STP30277S


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