The phosphoric acid production in the world generates a large amount of phosphogypsum with the emission of toxic acid fluorine gas into the atmosphere, which forms a significant source of environmental contamination. In this work, a novel and a simple procedure allows converting phosphogypsum waste by using hydrofluoric acid and sodium fluoride into valuable products. The obtained results confirm well the efficiency of this procedure, which permits to synthesize at room temperature, the sodium hydrogen sulfate monohydrate and a relatively pure nano-calcium fluoride from the exact stoichiometric proportions of the phosphogypsum, hydrofluoric acid, and sodium fluoride. The total phosphogypsum conversion is achieved after reaction time equal to 1.5 h. Generally, this procedure offers not only a solution for reducing phosphogypsum waste but also permits to obtain valuable products, which interest several sectors of industry.

世界上的磷酸生产会产生大量的磷石膏，并向大气排放有毒的酸性氟气，这是环境污染的重要来源。在这项工作中，一种新颖而简单的方法可以通过使用氢氟酸和氟化钠将磷石膏废料转化为有价值的产品。所获得的结果很好地证实了该方法的效率，该方法允许在室温下从磷酸石膏，氢氟酸和氟化钠的精确化学计量比例合成硫酸氢钠一水合物和相对纯的纳米氟化钙。在等于1.5小时的反应时间后，实现了总的磷石膏转化率。通常，