Study Optimizes Rare Earth Recovery from Low-Grade Granite Ore in China

Highlights

• A new study from Central South University optimizes rare earth recovery from low-grade granite ore at China's Baerzhe deposit in Inner Mongolia.
• Combining high-gradient magnetic separation with flotation raised total rare earth oxide concentration from 0.995% to 21.57%, a more than 21-fold increase.
• The magnetic separation step recovered roughly 72% of rare earths while eliminating nearly 94% of quartz and feldspar waste rock.
• The study is laboratory-scale only and does not address commercial scalability, operating costs, or downstream refining and metal production.
• China's ongoing investment in beneficiation technology allows it to extract value from increasingly complex, lower-grade deposits, widening its midstream supply chain advantage.

China continues to widen its technological advantage in rare earth processing—not by finding new deposits, but by extracting more value from lower-grade ore. A new study (opens in a new tab) led by Shiyu Zhao and colleagues at School of Minerals Processing and Bioengineering, Central South University, Changsha, Hunan (opens in a new tab), published in Minerals Engineering, describes an improved processing method for low-grade granite-hosted rare earth ore from the Baerzhe deposit in Inner Mongolia, one of China's largest granite-type rare earth resources. The researchers combined high-gradient magnetic separation (HGMS) with flotation after first analyzing the ore's mineral composition. They found that hingganite and monazite were the primary rare earth-bearing minerals and designed the processing flow around those characteristics.

The results were impressive. The process increased total rare earth oxide (TREO) concentration from 0.995% in the raw ore to 21.57% in the final concentrate—more than a 21-fold increase. HGMS recovered about 72% of the rare earths while removing nearly 94% of the quartz and feldspar waste rock. A flotation step then further upgraded the concentrate using oxidized paraffin soap as the collector.

The study has important limitations. It is a laboratory-scale beneficiation study, not a commercial demonstration. It focuses on producing a higher-grade concentrate and does not evaluate downstream rare earth separation, oxide refining, metal production, magnet manufacturing, operating costs, environmental performance, or commercial scalability. Those factors ultimately determine whether a process can succeed in industry.

For Rare Earth Exchanges®, the broader lesson is clear. China's advantage extends far beyond mining. It continues to invest in ore characterization, beneficiation technology, reagent chemistry, and process optimization, allowing it to recover valuable rare earths from increasingly complex and lower-grade deposits.

Rare Earth Exchanges Assessment

Western governments often focus on opening new mines. This study highlights a different reality: processing technology is becoming just as important as the resource itself. As higher-grade deposits become harder to find, the countries that can economically process lower-grade ore will gain a lasting competitive advantage. China continues to strengthen that advantage across the critical midstream of the rare earth supply chain.