Demands for phosphoric acid are growing rapidly in various industries. This has highlighted the importance of optimizing its production and purification methods. Phosphoric acid can be produced by a wet process. However, due to the presence of many organic and inorganic impurities in the wet product, purification of the resulting product is a major concern in this industry. Removal of trace metal impurities (such as magnesium, cadmium, chromium, zinc, etc.) from produced phosphoric acid in a wet process was investigated by foam fractionation in a semi-batch setup using sodium dodecyl sulfate (SDS) as the surfactant. Effects of inlet air velocity, surfactant concentration, and surfactant selectivity were investigated. The optimum air velocity and surfactant concentration were obtained as 0.020 cm/min and 0.7 g/L, respectively. At the optimum condition, the total removal efficiency and enrichment factor reached were 70.2% and 4.39, respectively, while the acid loss was 8.3%. The total metal removal efficiency was increased to 95.3% in a two-stage experimental run.

中文翻译：

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泡沫分馏去除预处理磷酸中的痕量金属杂质

在各个行业中，对磷酸的需求正在迅速增长。这突出了优化其生产和纯化方法的重要性。磷酸可以通过湿法生产。然而，由于在湿产品中存在许多有机和无机杂质，所得产物的纯化是该行业中的主要问题。去除微量金属杂质（例如镁，镉，铬，锌等）通过使用十二烷基硫酸钠（SDS）作为表面活性剂在半间歇装置中进行泡沫分馏，研究了湿法生产的磷酸中的。）。研究了进气速度，表面活性剂浓度和表面活性剂选择性的影响。最佳风速和表面活性剂浓度分别为0.020 cm / min和0.7 g / L。在最佳条件下，总去除效率和富集系数分别为70.2％和4.39，而酸损失为8.3％。在两个阶段的实验运行中，总金属去除效率提高到95.3％。