A. Soare, R.L.M. Demmer, S. Jiang, A. Zwijnenburg
Sodium chloride is the most commonly used salt in the winter for keeping roads free of ice and snow. De-icing salt contains an anticaking agent to ensure that it is easy to spread and can be easily stored for prolonged periods. Presently ferrocyanide is the most commonly used anticaking agent for de-icing salt. As a result, a considerable amount of ferrocyanide enters the environment, which has raised environmental concerns. Ecosel®BioCare is an anticaking agent based on tartrate derivatives originating from the wine industry. This anticaking agent is cyanide free and readily biodegradable and therefore does not pose any risk to the environment. In this paper the anticaking mechanism, operational conditions, and industrial tests of Ecosel®BioCare are described.
Temperature and humidity variations occur during de-icing salt storage. When temperature is above 0 oC, salt bridge formation via dissolution and recrystallization of sodium chloride (NaCl) is the major caking mechanism. When temperature is below 0 oC, the formation of sodium chloride dihydrate is responsible for caking. Dihydrate crystals grow on the surface of the sodium chloride crystals, acting as glue between them.
Ecosel®BioCare has been tested in vacuum salt, rock salt, and sea salt stored in bag, pile, and vertical silo up to 1 year. It shows effective anticaking function for salt with moisture content up to 0.5%.
|Create Date||July 6, 2018|