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
Start your free trial today and get unlimited access to America's largest dictionary, with:
- More than 250,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Seen and Heard
What made you want to look up salt cake? Please tell us where you read or heard it (including the quote, if possible).