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Answer for the clue "A compound of alumina and a metallic oxide ", 9 letters:
aluminate

Word definitions for aluminate in dictionaries

Wikipedia Word definitions in Wikipedia
In chemistry aluminate is a compound containing an oxyanion of aluminium , such as sodium aluminate . In the naming of inorganic compounds it is a suffix that indicates a polyatomic anion with a central aluminum atom.

WordNet Word definitions in WordNet
n. a compound of alumina and a metallic oxide

Wiktionary Word definitions in Wiktionary
n. (context chemistry English) A compound, containing aluminium and oxygen with more electropositive elements, that is a salt of the hypothetical aluminic acid

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Aluminate \A*lu`mi*nate\, n. (Chem.) A compound formed from the hydrate of aluminium by the substitution of a metal for the hydrogen.

Usage examples of aluminate.

Thomsen decomposed cryolite with calcium hydroxide into calcium fluoride and sodium aluminate.

The infamous red mud is heated with limestone (calcium carbonate) and soda to regenerate sodium aluminate, and the solution is fed back into the Bayer process.

Thomsen decomposed cryolite with calcium hydroxide into calcium fluoride and sodium aluminate.

The dissolved silica reacts with sodium aluminate to form sodium hydroaluminosilicate, which is essentially a waste product.