The extraction process you are describing is called Lixiviation. This term refers to the process of leaching or washing out soluble substances from a solid by using a liquid solvent, typically water.
Sodium sulfate and crushed limestone and coal were mixed and fired to create black ash; the final step was to wash it with water (then evaporated). This extraction process was called
answers:
Lixiviation
Levitation
Lexographic
Liquidation
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