i suppose it could be transportation cost LOL
In North America, it is produced primarily from
Great Salt Lake brine.
Dust and erosion control[edit]
Magnesium chloride is one of many substances used for dust control,
soil stabilization, and
wind erosion mitigation.
[10] When magnesium chloride is applied to roads and bare soil areas, both positive and negative performance issues occur which are related to many application factors.
[11]
Ice control[edit]
Picture of truck applying liquid de-icer (magnesium chloride) to city streets.
Magnesium chloride is used for low-temperature de-icing of
highways,
sidewalks, and
parking lots. When highways are treacherous due to icy conditions, magnesium chloride is applied to help prevent ice from bonding to the pavement, allowing
snow plows to clear treated roads more efficiently.
For the purpose of preventing ice from forming on pavement, magnesium chloride is applied in three ways: anti-icing, which involves spreading it on roads to prevent snow from sticking and forming; prewetting, which means a liquid formulation of magnesium chloride is sprayed directly onto salt as it is being spread onto roadway pavement, wetting the salt so that it sticks to the road; and pretreating, when magnesium chloride and salt are mixed together before they are loaded onto trucks and spread onto paved roads.
Calcium chloride damages concrete twice as fast as magnesium chloride.
[15] The amount of magnesium chloride is supposed to be controlled when it is used for de-icing as it may cause pollution to the environment.
