Phosphorus removal method in high-purity scandium oxide preparation process and high-purity scandium oxide after phosphorus removal

By washing with an ethanol-water solution before calcining scandium oxalate to remove phosphorus-containing extractant, the problem of low purity after calcination of scandium oxalate was solved, thus reducing the cost of preparing high-purity scandium oxide and treating waste liquid.

CN122403487APending Publication Date: 2026-07-17JINGMEN GEM NEW MATERIAL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JINGMEN GEM NEW MATERIAL CO LTD
Filing Date
2026-05-12
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

In the existing technology, it is difficult to remove the phosphorus-containing extractant entrained after scandium oxalate is calcined, which leads to a decrease in the purity of scandium oxide products and high waste liquid treatment costs.

Method used

Before calcining scandium oxalate, it is washed with an ethanol-water solution. Through multiple washes, the phosphorus-containing extractant on the surface of scandium oxalate is removed. Ethanol is volatile and can be recycled, reducing the cost of waste liquid treatment.

Benefits of technology

The preparation of high-purity scandium oxide with a total rare earth content of over 99% has been achieved, reducing waste liquid treatment costs and environmental burden, and improving scandium oxide recovery rate.

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Abstract

本发明属于提供了一种高纯氧化钪制备过程中的除磷方法及除磷后的高纯氧化钪。所述除磷方法包括以下步骤：提供未进行煅烧处理的草酸钪，对未进行煅烧处理的草酸钪采用乙醇水溶液进行洗涤处理，得到除磷后的草酸钪，对除磷后的草酸钪进行煅烧处理，得到除磷后的高纯氧化钪。本发明在草酸钪煅烧处理前，采用乙醇水溶液进行洗涤处理，对草酸钪中残留的含磷萃取剂具有良好的溶解性，且易挥发，不会在草酸钪中残留引入新杂质，具有优异的除磷效果，同时提升了氧化钪回收率，降低了废液处理成本和环境负担，更有利于工业化应用生产。
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