Ionic rare earth ore smelting method based on collaborative precipitation and resource circulation
By combining acid leaching with multi-stage pH control, along with co-precipitation of ferric hydroxide, alkali conversion, and stepwise precipitation, efficient impurity removal and resource recycling were achieved. This solved the problems of low rare earth recovery rate and environmental protection in traditional ion-type rare earth ore smelting, producing high-purity rare earth products and realizing wastewater resource utilization.
Patent Information
- Application Number
- CN202610258270.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-03-04
- Publication Date
- 2026-06-26
AI Technical Summary
Traditional ion-adsorption rare earth ore smelting processes suffer from problems such as low rare earth recovery rates, severe ammonia nitrogen pollution, serious impurity interference, rare earth loss due to sulfate, prominent fluorine hazards, and significant environmental and resource utilization pressures. Existing technologies have failed to systematically solve these problems.
The method employs acid leaching and multi-stage precise pH control. Barium chloride is added to eliminate sulfate, and ferric hydroxide co-precipitation and alkali conversion are used to achieve deep impurity removal. Iron and fluoride are removed by a stepped pH precipitation process. Alkali wash water is recycled to achieve full wastewater recycling, and valuable elements are recovered through lime precipitation and evaporation crystallization.
It improved the rare earth yield, reduced the rare earth content in the tailings, enabled the production of high-purity rare earth products, treated wastewater for resource recovery, and recovered valuable elements such as aluminum and iron, thus solving environmental protection and resource recovery issues.