Salt is extensively used in the chemical industry; in the manufacture of baking soda, sodium bicarbonate; of caustic soda, sodium hydroxide; of hydrochloric acid, of chlorine etc. It is also used in soap-making, and in the manufacture of glaze and porcelain enamel. It also enters metallurgic processes as flux, a compound used to assist the fusing of metals.
Salt lowers the melting point of water, so in combination with grit, it is used for clearing roads of snow and ice. It is also used for water-softening by means of removing calcium and magnesium compounds from tap water.