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14 days ago

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[Mixture (sand, iron filings, potassium aluminum sulfate)]
           ↓ (Magnetic Separation)
  [Iron filings]     [Mixture (sand + potassium aluminum sulfate)]
                                    ↓ (Add Water & Filtration)
   [Sand]                        [Potassium aluminum sulfate solution]
                                             ↓ (Evaporation)
                                        [Potassium aluminum sulfate]