Filtration studies with neutron-activated coal fly ash

Factors influencing the release of boron from coal ash materials

“…The results are summarized in Table II. Other investigators have reported values for total composition (1, 6-10), whereas others have leached with water, acids, and bases (2,7,11,12). The values we report are, in general, less than the total composition values and similar to those obtained by similar leaching conditions.…”

Role of fly ash in catalytic oxidation of sulfur(IV) slurries

“…A 0.22-pm pore size Millipore filter was used to filter solutions for leachate analysis and reaction aliquots. This pore size was chosen as the maximum size which appears to trap all ash particles to which metals might absorb (7). ESCA work was done on an ES200 instrument with an A1 anode.…”

Elemental distribution in coal fly ash particles

“…Fifty milliliters of saturated boric acid was added to the HF solutions and a duplicate water solution to bring their volumes to 100.0 mL. The solutions were shaken with the ash for an additional hour and then fil-tered through tared, acid-washed, O.l-µ Nuclepore filters, since previous studies have demonstrated quantitative removal of fly ash particles with <0.2-µ pore filters, but not with >0.4 µ filters (19). The filtrate was analyzed by atomic absorption spectroscopy and instrumental neutron activation analysis as previously described (13)(14)(15)20).…”