How Does Salt Melt Ice?: Salt melts ice by lowering the freezing point of the water around the ice. The ice melts and is unable to re-freeze except at a much lower temperature.
Why doesn't vodka freeze when you put it in the freezer? The answer relates to the chemical composition of vodka and freezing point depression.
Adding salt to ice doesn't just melt it. It also makes it colder because of freezing point depression.
The rate at which icecubes melt depends on where there are and the temperature of their environment.