Abstract
Precipitation is often used for the preparation of La(OH)3 with precipitants of liquid alkali and ammonia. To solve the problems of high cost and wastewater pollution caused by common precipitants, the active MgO synthesized by pyrolysis was used as the precipitant to prepare La(OH)3. The species distribution of LaCl3 and LaCl3–MgCl2 mixed system solution was calculated, and the kinetic analysis of the precipitation process was carried out to confirm the key factors influencing the precipitation of La(OH)3. The results show that La(OH)3 with D50 of 5.57 μm, a specific surface area of 25.70 m2/g, a rod-like shape, and MgO content of 0.044 wt%, was successfully prepared by adding active MgO. The precipitation ratio of La reaches 99.92%. The La(OH)3 precipitation is controlled by the diffusion process. The activity of MgO has a significant influence on MgO content in the precipitate. The preparation of La(OH)3 by active MgO provides a potential way for an eco-friendly preparation method of rare earth.
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