Preventing caking and obtaining flowability of alkali chlorides and salt mixtures thereof

A flowable alkali metal chloride composition resistant to caking on storage including as an anticaking agent (A) a complex iron cyanide (B) a water insoluble, inorganic, inert, finely divided hydroxyl group containing carrier material, optionally (C) and including (D) where (C) is a hydrophobizing material and (D) is

• a polycarboxylate containing a predominant amount of carboxylic acid or carboxylate groups and also containing carbonyl groups, hydroxyl groups or a mixture of carbonyl and hydroxyl groups and which polycarboxylate has an average degree of polymerization between 5 and 500, said materials (A), (C) and (D) being present on B, said anticaking agent providing a permanent moisture content of at least 0.01 weight % of water on the salt.

A flowable alkali metal chloride composition resistant to caking on storage including as an anticaking agent (A) sodium, potassium or calcium ferrocyanide (B) a water insoluble, inorganic, inert finely divided hydroxyl group containing carrier material, optionally (C) and including (D) where C is a hydrophobizing material and (D) is the sodium salt of a polycarboxylate having carbonyl groups, hydroxyl groups, or both carbonyl and hydroxyl groups and (D) is present in an amount of 0.001 to 0.1 weight % based on alkali metal chloride, said materials (A) (C) and (D) being present on B, said anticaking agent providing a permanent moisture content of at least 0.01 weight % of water on the salt.