Solvent extraction for metal and water recovery from industrial wastes and effluents

Abstract

A aplicação da técnica de extração por solventes para a recuperação de metais e da água a partir de resíduos e efluentes industriais é apresentada nesse trabalho. Os seguintes estudos de caso foram analisados: (1) separação seletiva e concentração de Zn contido em efluentes gerados na indústria de zinco, (2) separação de Zn e Fe presentes em efluentes da indústria de galvanização a quente e (3) recuperação de Co e Ni a partir de baterias de celular descarregadas. Dados obtidos em escala de laboratório e em escala-piloto foram empregados para demonstrar a potencialidade da técnica no tratamento de efluentes, visando à reutilização, tanto dos metais, quanto da água, que seriam inutilizados, resultando em economia de energia com redução de impactos ambientais, além da minimização dos custos relacionados ao transporte de materiais perigosos e manutenção de aterros. Palavras-chave:Extração por solventes, recuperação de metais, meio ambiente. Abstract The use of solvent extraction to recover metals and water from industrial residues is highlighted in this work. The method was applied (1) to selectively concentrate Zn from effluents generated by the zinc industry, (2) to separate Zn and Fe from spent pickling effluents produced by the hot-dip galvanizing industry, and (3) to recoverCo and Ni from spent batteries. Batch and pilot scale data was used to point out solvent extraction as a feasible method to reuse both metals and water thus resulting in energy savings with reducing environmental impacts, minimizing costs required to transport hazardous materials to waste sites, to replace the discharged wastewater and to produce the raw material that would be previously discharged as wastes.

Separation of iron(iii), zinc(ii) and lead(ii) from a choline chloride–ethylene glycol deep eutectic solvent by solvent extraction

“…Therefore, lactiline could favor Zn(II) extraction by C272. 12,[30][31][32][33][34] For the separation of Fe(III), Pb(II) and Zn(II) from ethaline, the best results for the selective Fe(III) extraction were obtained with C923. The co-extraction of Zn(II) was minimal and Pb(II) was not co-extracted.…”

An overview on potential hydrometallurgical processes for separation and recovery of manganese

“…The solvent extraction of Mn (II) using DMNPA in heptane was investigated by [67,68]. They proposed the stoichiometry of the extracted Mn complex as MnA2(HA)4.…”