一种窄粒径分布氧化镝及其制备方法
By adopting the route of dysprosium nitrate solution-constant supersaturated oxalate dropwise precipitation-dispersion modification and sequential surface composite control-combined aging-controlled calcination, the problems of wide particle size distribution and agglomeration in the oxalate precipitation method were solved, and narrow particle size distribution and high performance of dysprosium oxide powder were realized.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- YIYANG HONGYUAN RARE EARTH
- Filing Date
- 2026-04-01
- Publication Date
- 2026-07-17
AI Technical Summary
In the traditional oxalate precipitation method for preparing dysprosium oxide, the high local instantaneous supersaturation leads to simultaneous nucleation and crystal growth, resulting in particle bridging and flocculation. This causes a wide particle size distribution and severe agglomeration, making it difficult to meet the requirements of powder uniformity and narrow distribution for applications such as magneto-optical ceramics.
The route of dysprosium nitrate solution-constant supersaturated oxalate dropwise precipitation-dispersion modification and sequential surface composite regulation-combined aging-controlled calcination was adopted. By using ammonium polyacrylate dispersant, dual-channel synchronous dropwise addition at constant pH and combined aging sequence, the generation and surface modification of dysprosium oxalate particles were controlled, particle bridging and flocculation were inhibited, and the particle size distribution was narrowed.
Obtaining dysprosium oxide powder with more concentrated particle size, narrower distribution, and more controllable agglomeration improves the tap density and sintering densification behavior of the powder, ensuring a high-performance raw material foundation for applications such as magneto-optical ceramics.
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Figure CN121948522B_ABST