Patent ID: 11957996
Assignee: SICHUAN NORMAL UNIVERSITY
Field: Chemical engineering (Chemistry)
Classification: CPC B  C  Y | IPC B  C

Claim 0:
1. A microwave chemical method for totally extracting fluorine and rare earth from bastnaesite concentrate, comprising the following steps:
step I, alkaline conversion defluorination of bastnaesite through microwave irradiation: adding bastnaesite concentrate into a corundum crucible, then adding sodium hydroxide, uniformly mixing, irradiating for 3-6 min with the optimal microwave power of 700 W, and conducting full alkaline conversion for bastnaesite concentrate to produce NaF and REmOn;
step II, microwave-assisted leaching of fluorine: grinding slag produced by the alkaline conversion in the step I, adding deionized water, and leaching for 6-10 min at the optimal microwave power of 70-350 W;
step III, solid-liquid separation: performing solid-liquid separation on a leaching solution by using a high-speed centrifugal machine to obtain a NaF-containing leaching solution and RE(OH)3-containing slag;
step IV, repeating the step II and the step III 1-3 times to produce rare earth-containing hydroxide slag, thereby implementing the separation of the fluorine and the rare earth; and
step V, microwave-assisted leaching of rare earth: irradiating the rare earth-containing hydroxide slag obtained in the step IV and 3 mol/L of hydrochloric acid according to an acid-to-ore ratio of (5-8):1 with the optimal microwave power of 70-350 W, and leaching the rare earth from the rare earth-containing hydroxide slag in a form of RECl3.