Continuous Stoichiometric Reaction in an Electrowinning Cell: Products Tab

Variable Definitions, Ranges and Default Values

The following table shows a brief description of the variables appearing in this tab. The table also displays their default values and their generally acceptable range:

Variable	Default Value	Range

○ Recovered with Plates ? Check the box next to a reaction product component to indicate that this component is recovered, either as cathode product or as anode product.	<No>	Positive
○ Cathode Product ? Check the box next to a reaction product component that is set as recovered to indicate that this component is recovered as a cathode product (as opposed to an anode product).	<No>	Positive
○ Electrons Transferred Per Molecule The number of electrons transferred through the external wire per molecule of recovered product. It is determined by multiplying the number of source ions used to produce one mol of the product, divided by the valency of those ions (e.g., if the product is copper, the source ion is Cu++; since one ion of Cu++ is used to form one mol of copper, and since the valency of Cu++ is 2, the number of electrons transferred per mol of copper is 2). You can specify either the electrons transferred for cathode products or the electrons transferred for anode products. If the “Specify Electrons Transferred for” option is set to “Cathode Products”, you can specify the number of electrons transfered only for components that are set as cathode products, whereas if the above option is set to “Anode Products”, you can specify the number of electrons transferred only for components that are set as anode products.	0	PositiveInteger,
● Recovered Product Flow (kg/h) The mass flow rate of each recovered product component.	0.0	Positive
○ Alloy Produced in Cathode Check this box to indicate that the cathode products are combined into an alloy on the cathode, and to choose the pure component that represents that alloy. This can be used, for example, if a copper-nickel alloy is produced on the cathode instead of individual copper and nickel components.	No	Yes/No
○ Alloy Comp. Name Indicates the pure component used to represent the alloy produced on the cathode. Click on the list box to bring up a list of available components in order to select one.	<None>	Any Cathode Product Comp.
● Performance (kg/h) The performance of the electrowinning cell, defined in terms of the total mass flow rate of cathode products (if the “Specify Electrons Transferred for” option is set to “Cathode Products”) or anode products (if the “Specify Electrons Transferred for” option is set to “Anode Products”).	0.0	Positive
○ Power Type Indicates the power type that is used by the operation. Click on the list box to bring up a list of available power types in order to select one.	<Std Power>	Any Power Type
○ Current Efficiency(%) The ratio of required electric current intensity to supplied electric current intensity. If the value is less than 100% then an increased total current intensity will be calculated by the program to satisfy the current requirement.	90.0	[0,100)
● Total Current (A) The intensity of electric current supplied for this operation.	0.0	Positive
○ Current Density (A/m2) The intensity of electric current supplied for this operation per unit active surface area of cathodes (if the “Specify Electrons Transferred for” option is set to “Cathode Products”) or anodes (if the “Specify Electrons Transferred for” option is set to “Anode Products”).	300.0	Positive
● Total Active Area Required (m2) The total active surface area of cathodes (if the “Specify Electrons Transferred for” option is set to “Cathode Products”) or anodes (if the “Specify Electrons Transferred for” option is set to “Anode Products”).	0.0	Positive
○ Cell Voltage (V) The supplied cell voltage.	1.5	Positive
● Total Power (kW) The power consumption for the reaction (per cycle).	0.0	Positive
● Power Per Unit (kW) The ratio of the total power consumed for the reaction (per cycle) divided by the number of equipment units.	0.0	Positive
● Specific Power (on Cell Volume Basis) (kW/m³) The ratio of the total power consumed for the reaction (per cycle) to the total volume of all electrowinning cells.	0.0	Positive
● Specific Power (on Performance Basis) (kWh/kg) The ratio of the total power consumed for the reaction (per cycle) to the performance.	0.0	Positive

Symbol Key: ○ User-specified value (always input); ● Calculated value (always output); ◙ Sometimes input, sometimes output

Specification Choices / Comments

The following list describes the available specification choices in this tab; for more details on how these are implemented, see Cont. Stoich. Reaction in an Electrowininng Cell: Modeling Calculations.

•Electron Transfer Specification Options...

You may choose to specify the electrons transferred either for cathode products or for anode products. If the “Cathode Products” option is selected, then you can only edit the “Electrons Transfered Per Molecule” values of cathode product components (i.e., components whose “Recovered with Plates?” and “Cathode Product?” options are checked). If the “Anode Products” option is selected, then you can only edit the “Electrons Transfered Per Molecule” value of anode product components (i.e., components whose “Recovered with Plates?” option is checked but the “Cathode Product?” option is not checked).

•Components Table...

For each component that is recovered, either as a cathode product or as an anode product, you must check the “Recovered with Plates?” option. Also, if that component is a cathode product, you must check the “Cathode Product?” option, and if it is an anode product, you must leave the “Cathode Product?” option un-checked. Finally, you must specify the electrons transferred per molecule of all cathode product components, if the electron transfer is set for cathode products, or the electrons transferred per molecule of all anode product components, if the electron transfer is set for anode products.