Mechanism of capture of ionic impurities from electrolytes, based on a bipolar cell of oscillating porous electrodes, spaced by the equilibrium distances
Advancing the chemical engineering fundamentals
Electrochemical Engineering - II (T2-14b)
Keywords: bipolar cells, vortices, probability of capture, free concentration
Summary: This work proposes the use of electrochemical cells (bipolar or series) like mechanism recuperate of impurities and noble species, from contaminated or impoverished electrolytes. The treated fluid circulates through porous or perforated electrodes of compound material. In order to produce successive, selective deposits of the different chemical substances, these electrodes are located spaced by specific distances. Different prototypes of electrodes were elaborated starting from a conductive base material with small dielectric zones, which can have their origin in ceramic particles or pores. The rate and selectivity of capture was related to the porosity and nature of the base of the electrode, quantified by the size, geometry, average density and distribution of the dielectric zones in the conductive matrix of the electrode.
The longitudinal coordinates of each electrode are determined by means of the plainer of the electric field, which appears between the terminal electrodes, anode and cathode, polarized by an external source of tension. Using methods of finite mathematics the map of the equipotential lines was simulated and the location exact of each electrode so that by effect of his polarization it extracts a single chemical species was found. The type and the number of electrodes of the cell filter are determined by the time of residence required by the fluid to process, in order to obtain an appropriate deposit based on the volumetric flow, the composition and concentration of impurities and noble species.
When disturbing electro magnetically the interphase electrode electrolyte, a zone where the probability of capture of an ionic species is significantly greater than the one of others is generated. A conduct of stochastic nature for the dynamics of electro winning is proposed. Defining a variable which we will call free concentration of the chemical species and the geometry of the electric field the location of the electrode collector where the probability of extracting it is greater is determined. The nature of the material of the electrodes formed by conductive and dielectric phases, creates internal borders with local accumulations of electric charges in them, these internal condensers activated electro magnetically behave like vortices (where the relations space-time of the field do not respond to the classic architecture of the relations of Maxwell), since they are generalized probability distributions that control the energy transfer.
The experimental verification of this mechanism was made using a multifactor design considering the electrical resistance equivalent of a cell, probability of capture, selectivity of the capture and effect of the perforations on the time of capture.
See the full pdf manuscript of the abstract.
Presented Wednesday 19, 12:00 to 12:20, in session Electrochemical Engineering -II (T2-14b).
