GROUP PARTITIONING OF SIMULATED HLLW COMPONENTS WITH USE OF IRON FERRITE ADDITIVE

Iron ferrite particles prepared by the wet method was applied for part itioning cations of a simulated high level liquid waste into four grou ps by means of magnetic filtration. The sample solution prepared by sl ight denitration with formic acid of 2.5M nitric acid solution contain ing more than 25 metallic ions to the pH of about 0.8 was used after c entrifugation to remove precipitates of Zr, Mo and Te ions. The separa tion of ions into each group was basically carried out by producing pr ecipitates such as hydroxides or carbonates in presence of ferrite par ticles at a pH controlled with ammonium hydroxide, retaining in the ma gnetic separation column as a mixture with ferrite particles, and re-d issolving only precipitates trapped in the column with 0.1M nitric aci d under keeping the magnetic field. The ferrite particles left in the column were also recovered for reuse by rinsing with diluted nitric ac id after switching off the field. The obtained results revealed that t he iron ferrite additive worked well on recovering the precipitates fr om the solution with the aid of a moderate magnetic field and enables the process consisting of four steps to partition the simulant ions in to four groups.