A New Method for Synthesis of Sodium Hexametaphosphate in One Step by Phosphoric Acid and Sodium Sulfate
Sodium hexametaphosphate is a functional phosphate,widely used in washing,water treatment,food,mineral processing,and other industrial production.Its traditional production process is old.To seek new raw material sources and establish new synthesis routes,we try to react directly with low-cost sodium sulfate and phosphoric acid.The feasibility of the direct reaction and the influence of calcination temperature,calcination time,and material ratio on the reaction were studied.It was found that under calcination conditions,the mixture of sodium sulfate and phosphoric acid underwent a double decomposition reaction,the sulfur in sodium sulfate escaped from the reaction system in gaseous form,and the remaining sodium element participated in the formation of sodium hexametaphosphate.With the increase of calcination time or calcination temperature,the decomposition of raw material sodium sulfate became more thorough.From the residual sulfur content of the product and XRD detection,it was found that the diffraction peak became gentle and gradually formed a glassy substance.The results showed that the best results were obtained when the calcination temperature was 800 ℃,the calcination time was 1 hour,and the material ratio was(1.01～1.02):1.The new process has the advantages of shortening the process and replacing high value soda ash with low value sodium sulfate raw material,and is worthy of further study.
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