Lead recovery from PbZrO3 using wet ball-mill technique and hydrothermal synthesis of α-zirconium phosphate from wastewater for resource recovery

Technique for recovering rare-earth metals from spent sintered Nd-Fe-B magnets without external heating

“…For example, when spent Pb-glass powder is subjected to mechano-chemical treatment with ethylenediaminetetraacetic acid (EDTA) aqueous solution, Pb and Ba can be extracted as EDTA complexes [11]. Similarly, lead sulfate crystals can be effectively collected in solid form from lead zirconate titanate [12][13][14] and lead lanthanum zirconate titanate [15] sintered compacts via mechano-chemical treatment with sulfuric acid. In the present study, we investigated the recovery of rare-earth metals such as Nd and Dy from spent sintered Nd-Fe-B magnets via mechano-chemical treatment with a mixed aqueous solution of HCl and (COOH) 2 without external heating.…”

On the Degradation Processes of Thin Film PZT in 0.1 N H2SO4

“…Here the zirconium and titanium from the PZT powders were dissolved into solution, and PbSO 4 was collected as a precipitate. 5,6 While such a low pH (near −0.5) may prove convenient for lead recovery, such a harsh environment will dissolve the anodic oxide of nearly any engineering metal, limiting general applications of this environment. Additionally, the dense, columnar microstructure of thin film sol-gel PZT may electrochemically behave differently from that of larger-grained bulk PZT.…”