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US 3,941,723 AGranted
Crystallized alkali metal silicate with sequestering agents
AssigneePhiladelphia Quartz Company
InventorHelmut H. Weldes
Life of this patent
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Abstract
Composite crystals of alkali metal silicate, particularly hydrated sodium metasilicates such as sodium metasilicate pentahydrate with sequestering agents, are formed by co-crystallization of liquors that contain both alkali metal silicate and sequestering agents.
Claims5
A process for the production of free flowing, non-caking readily soluble granules comprising the steps of
- a. preparing an alkali metal silicate liquor having an M.sub.2 O:SiO.sub.2 mole ratio of 0.96 to 2.3:1.0 and a solids content of at least 30%,
- b. introducing a sequestering agent of particle size less than 65 mesh into said silicate liquor, the ratio of said sequestering agent solids to alkali metal silicate solids being up to 2.5:1.0 and selected from the group consisting of sodium salts of organic amino acids, potassium salts of organic amino acids sodium salts of organic hydroxy acids, potassium salts of organic hydroxy acids, sodium salts of organic polyhydroxy acids, potassium salts of organic polyhydroxy acids,
- c. crystallizing the resultant solution to obtain an easily crushable cake,
- d. crushing said cake to obtain the desired granules.
1 more element
Dependencies are inferred from the claim text.