Ningning Zhang

TL;DR: In this article, the authors investigated the modes of occurrences of rare earth elements and yttrium (REY) in fly ash and found that the silicate & aluminosilicate form was the dominant mode of occurrence of REY; this form accounted for 80% of the material.

TL;DR: In this paper, a two-stage hydrometallurgical process (alkali fusion-acid leaching) was developed to recover rare earth elements (REEs) from CFA.

TL;DR: The surface chemistry of acid-treated kaolinite and diaspore in the presence of flotation reagents (sodium hexametaphosphate as a depressant and dodecylamine hydrochloride (DAH) as a collector) using X-ray photoelectron spectroscopy (XPS) analysis and zeta potential determinations was reported in this article.

TL;DR: In this paper, the effects of various factors on the leaching efficiencies of rare earth elements (REEs) from coal fly ash (CFA) were investigated systematically, and two unreacted core shrinkage models (chemically controlled model and diffusion controlled model) were used to study the leach kinetics of REEs from CFA, except for the small influence of the stirring speed, the temperature, acid concentr...

TL;DR: In this paper, coal fly ash (CFA), the main byproduct of coal combustion, has been regarded as an attractive source of rare earth elements plus yttrium (REY).