Current Density
also known as cathode current density · CD
Current density is the total cell current divided by the total cathode area immersed in the cell, normally expressed in A/m². It is the master variable in electrowinning: raising it increases production from a given cell footprint, but it also raises the cell voltage, encourages dendrite growth and impurity co-deposition, and narrows the operating window on electrolyte temperature and flow.
Why it matters in practice
Choosing a current density is a straight trade of capital against operability. Bench and pilot cells are where the practical ceiling for a given electrolyte is established, because the limit usually appears as rough or nodular deposit rather than as an obvious failure.
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Reference entry GL-CURRENT-DENSITY. Definitions on this page describe engineering practice in hydrometallurgical process design; they are not a substitute for test work on your own material.