Abstract
ABSTRACT Mercury extraction from acidic aqueous solutions by the TRUEX process solvent (0.2 M CMPO - 1.4 M TBP in n-dodecane) has not extensively been examined. Research at the Idaho Chemical Processing Plant (ICPP) is currently being conducted to evaluate the TRUEX process for actinide removal from several acidic waste streams, including liquid sodium-bearing waste (SBW), which contains significant quantities of mercury. Preliminary experiments were performed involving the extraction of Hg203, added as HgCl2, from 0.01 to 10 M HNO3 solutions. Mercury distribution coefficients (DHg) range between 3 and 60 from 0.01 M to 2 M HNO3. At higher nitric acid concentrations, i.e. 5 M HNO3 or greater, DHg significantly decreases to values less than 1. These results indicate mercury is extracted from acidic solutions ˜5 M HNO3. Experimental results indicate the extractable species is HgCl2 from nitrate media, i.e., chloride must be present in the nitrate feed to e...
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