Formula Used:
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Definition: This calculator determines the number of washing stages required in batch leaching to achieve a desired fraction of solute remaining in the solid.
Purpose: It helps chemical engineers and process designers optimize leaching operations by determining the required number of washing stages.
The calculator uses the formula:
Where:
Explanation: The natural logarithm of the inverse of the desired solute fraction is divided by the natural logarithm of (1 + β) to determine the number of washing stages needed.
Details: Proper calculation ensures efficient solute recovery, minimizes solvent usage, and optimizes process economics in leaching operations.
Tips: Enter the desired fraction of solute remaining (θN) and the solvent ratio (β). Typical values are θN = 0.001 (0.1% remaining) and β = 3.
Q1: What does θN represent?
A: θN is the fraction of the original solute mass that remains in the solid after N washing stages.
Q2: How is β determined?
A: β is the ratio of solvent decanted to solvent retained in the solid after each washing stage, typically determined experimentally.
Q3: What's a typical θN value?
A: Common targets range from 0.01 (1% remaining) to 0.001 (0.1% remaining) depending on process requirements.
Q4: Does this formula account for imperfect mixing?
A: No, this assumes ideal mixing and complete equilibrium in each stage. Real systems may require more stages.
Q5: Can this be used for continuous leaching?
A: No, this formula is specifically for batch leaching operations.