salt cake

noun Chemistry.
an impure form of sodium sulfate, especially as obtained by the interaction of sulfuric acid and common salt in the synthesis of hydrochloric acid: used chiefly in the manufacture of glass, ceramic glazes, soaps, and sodium salts.

Origin:
1695–1705

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World English Dictionary
salt cake
 
n
an impure form of sodium sulphate obtained as a by-product in several industrial processes: used in the manufacture of detergents, glass, and ceramic glazes

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Example sentences
As the concentrate cools, a portion of it crystallizes, forming solid salt cake.
At these moisture contents, the nitrate salt surrogate had a salt cake consistency and readily clumped.
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