Granular calcium hypochlorite coated with a low melting inorganic salt by spray graining
AssigneeOlin Corporation
InventorsWalter C. Saeman, Noel N. Coe
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Abstract
A process is described in which granular calcium hypochlorite particles are encapsulated with at least one layer of a hydrated low melting inorganic salt. In this process granular calcium hypochlorite particles are lifted from a moving bed to the upper part of a distribution zone and the lifted particles are released to fall downwardly through the upper portion to the moving bed. A molten hydrated low melting inorganic salt is sprayed onto the falling particles above the moving bed, and the coated particles are cooled to provide at least one solid outer layer of said low melting hydrated inorganic salt.
Claims20
Coated rounded granular calcium hypochlorite particles comprised of a core of calcium hypochlorite encapsulated with a plurality of layers of a low melting inorganic salt wherein said low melting inorganic salt is selected from the group consisting of hydrated alkali metal metaborate, hydrated alkali metal tetraborate, hydrated aluminum sulfate, hydrated magnesium sulfate, eutectic mixtures of alkali metal metaborate and hydrated alkali metal tetraborate, and mixtures thereof, and said inorganic salt having a melting point in the range from about 40.degree. to about 150.degree. C., wherein said core is prepared by spray graining of a calcium hypochlorite slurry in a distribution zone and said encapsulation is formed by spraying said particles with a melt of said inorganic salt and wherein said core ranges in diameter from about 200 to about 2000 microns and the outside diameter of said particles ranges from about 400 to about 5000 microns.
Dependencies are inferred from the claim text.