salt cake

noun

Definition of salt cake

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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