Abstract

In this article, the recovery of the Y, La, Nd, and Ce rare-earth elements (REE) from apatite concentrate by acid leaching and digestion-water leaching processes were studied. The maximum REE recovery of 62% in the acid leaching process with sulfuric acid was obtained for La in the condition of 12 M acid concentration, leaching time of 4 h, process temperature of 25°C , and a liquid to solid ratio (L/S) of 1:5. In the optimal conditions in terms of process (220°C, 3 h and L/S (1:2)), the digesting process in the presence of sulfuric acid led to the recovery of La, Ce, Nd and Y at 93.92, 92.22, 92.04 and 91.00%, respectively. In contrast, the aqueous leaching process in the optimum conditions, including a leaching time of 5 h, at 80°C and L/S of 1:10 ended up recovering the La, Ce, Nd, and Y at 89.50, 88.45, 92.20 and 94.0%, respectively.

中文翻译：

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伊朗莫瓦里德铁矿通过酸浸和消化水浸出工艺从磷灰石精矿中回收稀土元素

摘要

在本文中，研究了通过酸浸和消化水浸工艺从磷灰石精矿中回收 Y、La、Nd 和 Ce 稀土元素 (REE)。在酸浓度12 M、浸出时间4 h、工艺温度25℃、液固比(L/ S) 的 1:5。在最佳工艺条件（220°C，3 h 和 L/S (1:2)）下，硫酸存在下的消化过程导致 La、Ce、Nd 和 Y 的回收率为 93.92，分别为 92.22、92.04 和 91.00%。相比之下，最佳条件下的水浸工艺，包括浸出时间为 5 h，在 80°C 和 L/S 为 1:10，最终回收了分别为 89.50、88.45、92.20 的 La、Ce、Nd 和 Y和 94.0%，分别。