salt cake
noun
1
: anhydrous sodium sulfate Na2SO4
especially
: a crude form obtained usually by reaction in a furnace of sulfuric acid on common salt in the manufacture of hydrochloric acid and used chiefly in the sulfate process for wood pulp and in making glass and chemicals
2
: a substance made by reaction of soda ash and sulfur and used in the sulfate pulp process
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Merriam-Webster unabridged
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