Sodium chloride is the main component of table salt and rock salt, and it is an ionic compound with colorless and transparent cubic crystals. Sodium oxide is widely present in seawater and natural salt lakes, and can be used to produce chlorine gas, hydrogen gas, hydrochloric acid, sodium hydroxide, chlorate, hypochlorite, bleaching powder, and metallic sodium. It is an important chemical raw material; Can be used for food seasoning and marinating fish, meat, and vegetables, as well as for salting out soap and tanning leather, etc; Highly refined sodium chloride can be used to make physiological saline solution for clinical treatment and physiological experiments, such as sodium loss, dehydration, blood loss, etc. Sodium chloride can be produced by concentrating crystalline seawater or natural salt lake or salt well water.