Process for purifying crude cyanuric acid whereby crude cyanuric acid is digested with a mono-substituted salt of a dibasic or tribasic inorganic acid at a temperature of about 160 DEG C to about 220 DEG C under at least the autogenously developed pressure to digest the crude cyanuric acid. A novel, large, free-flowing cyanuric acid product is recovered free of any hard cement-like masses.
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