title: Electrical Behavior of Copper Mine Tailings During EKR with Modified Electric Fields.
abstract: Electro-kinetic remediation (EKR) with sinusoidal electric field obtained simultaneously with DC/AC voltage reduce the polarization of the EKR with DC voltage. The DC voltage value defines the presence of a periodic polarity reversal of the cell and the electrical charge for electro-kinetic transport. In this case, the AC frequency favors the breaking of polarization conditions resulting from the EKR with DC voltage. However, with high frequencies a negative effect occurs where the tailings behave as a filter circuit, discriminating frequencies of an electric signal. The goal of this work is to analyse the electrical behaviour of tailings in EKR experiments. The conditions selected were: DC/AC voltages: 10/15 and 20/25 V (peak values), and AC voltage frequencies 50-2000 Hz. When the AC frequency reaches 2000 Hz, the copper removal tends to zero, indicating that the tailing behaves as a high-pass filter in which the DC voltage was filtered out.
authors.affiliation: Universidad Técnica Federico Santa María, Casilla 110-V, Valparaiso, Chile. adrian.rojo@usm.cl.
authors.forename: Adrian
authors.initials: A
authors.lastname: Rojo
authors.affiliation: Universidad Técnica Federico Santa María, Casilla 110-V, Valparaiso, Chile.
authors.forename: Henrik K
authors.initials: HK
authors.lastname: Hansen
authors.affiliation: Universidad Técnica Federico Santa María, Casilla 110-V, Valparaiso, Chile.
authors.forename: Omara
authors.initials: O
authors.lastname: Monárdez
authors.affiliation: Universidad Técnica Federico Santa María, Casilla 110-V, Valparaiso, Chile.
authors.forename: Carlos
authors.initials: C
authors.lastname: Jorquera
authors.affiliation: Universidad Técnica Federico Santa María, Casilla 110-V, Valparaiso, Chile.
authors.forename: Paulina
authors.initials: P
authors.lastname: Santis
authors.affiliation: Universidad Técnica Federico Santa María, Casilla 110-V, Valparaiso, Chile.
authors.forename: Paula
authors.initials: P
authors.lastname: Inostroza
mesh_terms: D003300:Copper / Q000737:chemistry* / Q000302:isolation & purification*; D004560:Electricity; D052918:Environmental Restoration and Remediation / Q000379:methods*; D007700:Kinetics; D008906:Mining; D012987:Soil / Q000737:chemistry*
chemical_list: D012987:Soil; D003300:Copper
keywords: Electro-remediation; Filter circuit; Mine tailings; Sinusoidal electric field