Anhydrous sodium sulfate is used to make sodium sulfide, paper pulp, glass, water glass, enamel, and also used as a laxative and antidote for barium salt poisoning. It is a by-product of the production of hydrochloric acid from table salt and sulfuric acid. Chemically used to make sodium sulfide, sodium silicate, etc. The laboratory is used to wash away the barium salt. Industrially used as raw materials for preparing NaOH and H?SO?, and also used in papermaking, glass, printing and dyeing, synthetic fiber, leather making, etc. Sodium sulfate is the most commonly used post-treatment desiccant in organic synthesis laboratories. In the chemical industry, it is used to manufacture sodium sulfide, sodium silicate, water glass and other chemical products. The paper industry is used as a cooking agent in the manufacture of kraft pulp. The glass industry is used to replace soda ash as a cosolvent. The textile industry is used to formulate vinylon spinning coagulant. Used in non-ferrous metal metallurgy, leather, etc.