No doubt GGG/Shenghe is well aware of current research on...

No doubt GGG/Shenghe is well aware of current research on non-refractory makeup of streenstrupine such as the following:

https://www.mdpi.com/2075-163X/10/3/248/htm

Minerals, Volume 10, Issue 3 (March 2020)
"The valorization of rare earth elements from a steenstrupine concentrate via combined hydrometallurgical and pyrometallurgical process was successfully performed using an optimized strategy with a rewashing process enabling maximal efficiency for rare earth elements (Ce, La, Nd, Y) approximately 96%. This study has revealed that this treatment is possible without thermal conditioning of initial sample. The optimal parameter for leaching are: 90 °C, 2 h, 400 rpm, solid/liquid ratio of 20 g/250 mL and a duration of 30 min."