Abstract: China has the richest resource of sodium sulfate in the world, mostly located in its undeveloped western area.Sodium sulfate is also a byproduct of many industrial processes,mostly containing pollutants.The market capacity of sodium sulfate is limited and its economics is poor. Therefore, it is important to develop a new process to utilize sodium sulfate economically.A novel process for manufacturing soda ash and sulfuric acid from sodium sulfate is presented in this paper. It uses calcium oxide and aqueous sodium dichromate solution as a working medium and consists of the following reactions.Reaction of sodium sulfate and calcium oxide in aqueous sodium dichromate solution to get calcium sulfate precipitate and aqueous sodium chromate solution; reduction and decomposition of calcium sulfate to regenerate calcium oxide and get sulfur dioxide; transformation of sulfur dioxide to produce sulfuric acid; carbonation of aqueous sodium chromate solution to regenerate sodium dichromate and get sodium bicarbonate precipitate; removal of chromate from sodium bicarbonate and production of sodium carbonate. The process has the features of low cost, little corrosion and pollution. Hopefully it would become a new way to utilize sodium sulfate.