A new facile process to remove Br− from waste printed circuit boards smelting ash: Thermodynamic analysis and process parameter optimization

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

“…Using the H 2 SO 4 roasting technology developed in our laboratory, 25 98.97% of Br is removed from WPCB-SA (Table S3 †). However, poisonous gases, such as SO 2 , HBr, and Br 2 are also generated.…”

“…As a pyro-metallurgical technology, collaborative smelting is widely used in the large-scale treatment of WPCBs because of its short process flow, high recovery yield of valuable metals, versatility, and economic benefits. 23 However, WPCBs contain high contents of flammable resins and plastics, and their combustion produces significant amounts of flue gases such as HBr and Br 2 , [24][25][26] which can further react with heavy metals to form bromides, such as CuBr/CuBr 2 , 25 PbBr 2 /PbCl x Br 2−x , 25,27 and ZnBr 2 . 27 These inorganic bromides together with some low saturated evaporation pressure substances finally form WPCB smelting ash (WPCB-SA), accounting for 21.4 wt% of the total Br content in WCPBs.…”

“…However, to the best of our knowledge, studies on the removal of bromides from WPCB-SA have rarely been reported, and the strategies are limited to H 2 SO 4 roasting and alkali leaching. 25,27,29,30 Wu et al 25 developed a H 2 SO 4 roasting technology wherein 98% of CuBr and PbBr 2 in WPCB-SA were removed using a 20-30% NaOH solution. However, H 2 SO 4 roasting is typically performed at a high temperature (315 °C), producing harmful SO 2 /HBr/Br 2 flue gases.…”

Simulação De Linhas De Transmissão Não Lineares Giromagnéticas Utilizando Modelagem Numérica Unidimensional

“…Nesse contexto, as placas de circuito impresso (PCI), principal componente dos produtos eletrônicos, são as maiores fontes de metais valiosos. Estas contêm mais de 60 elementos, entre eles Au, Cu, Pd, Ni e Pb (LI et al, 2020;LIU et al, 2020;QIU et al, 2020). Entre esses se destaca o cobre, pela quantidade contida nas PCI's, que pode conter cerca de 30 a 40 de vezes mais desse elemento do que a encontrada no minério (SODHA; TIPRE; DAVE, 2020).…”