Effective treatment and recovery of laurionite-type lead from toxic industrial solid wastes

Eco-friendly and low-cost removal of bromine from waste printed circuit board smelting ash by mechano-chemical leaching

“…In addition, the following reactions eqn (5) and (6) are also expected to occur, according to Ioannidis et al reported. 38 PbBr + (l) + OH − → Pb(OH)Br (s) PbBr 2(s) + OH − → Pb(OH)Br (s) + Br − PbClBr (s) + OH − → Pb(OH)Br (s) + Cl − …”

“…5c. The dissolution reactions of Pb(OH)Br with NaOH under the action of the mechanical force may be represented as follows: 38 Pb(OH)Br (s) + OH − → Pb(OH) 2(s) + Br − …”

“…In addition, the following reactions eqn (5) and ( 6) are also expected to occur, according to Ioannidis et al reported. 38 PbBr þ ðlÞ þ OH À ! PbðOHÞBr ðsÞ ð4Þ…”

“…A high NaOH concentration possibly promotes the decomposition of Pb(OH)Br to form soluble bromides under the action of the mechanical force, which is also validated by the Br removal yield in Fig.5c. The dissolution reactions of Pb(OH)Br with NaOH under the action of the mechanical force may be represented as follows:38 PbðOHÞBr ðsÞ þ OH À ! PbðOHÞ 2ðsÞ þ Br À…”

Mineral precipitation during production of geothermal fluid from a Permian Rotliegend reservoir

“…In other environments, laurionite is typically a product of industrial operations; e.g. landfill leaching in soils, or oxidation of Pb ore deposits (Ioannidis et al, 2006). It was also found in scales of a geothermal field in Kamchatka (Povarov et al, 2003) and of gas wells in NW Europe (Schmidt, 1998).…”