Abstract The phosphoric acid production in Morocco generates a large amount of phosphogypsum (PG) which is a significant source of environmental contamination. In this work, PG has been characterized by different analysis techniques that allow to study the effect of the impurities on its physical and chemical properties. Thus, a method to purify the PG from phosphates and fluorides was proposed in order to improve its quality and to make it usable in plaster and cement. The purification process consists to sieve PG under 200 μm and to treat it by sulfuric acid to dissolve the insoluble impurities. The obtained results show that the treatment of PG by sulfuric acid 20 and 50% at 60 °C for 2 h is sufficient to make it suitable for used in the plaster and the cement respectively.

中文翻译：

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废磷石膏的表征和纯化，使其适用于石膏和水泥工业

摘要 摩洛哥的磷酸生产会产生大量的磷石膏（PG），这是环境污染的重要来源。在这项工作中，PG 已通过不同的分析技术进行表征，这些技术允许研究杂质对其物理和化学性质的影响。因此，提出了一种从磷酸盐和氟化物中纯化 PG 的方法，以提高其质量并使其可用于石膏和水泥中。纯化过程包括将PG筛分到200μm以下，并用硫酸处理以溶解不溶性杂质。所得结果表明, PG 用 20% 和 50% 的硫酸在 60 °C 下处理 2 h 足以使其分别适用于石膏和水泥中。