| abstract |
The invention discloses a method for extracting rare earth from bastnaesite and recovering fluorine resources. Adding clear water and hydrochloric acid complexing agent to the slag, and filtering to obtain secondary leaching residue and secondary leaching solution; S3, subjecting the primary leaching solution and the secondary leaching solution to conditioning and filtering to obtain conditioned slag; S4, dissolving conditioning slag with hydrochloric acid The residue is filtered and separated to obtain a filter residue. The filter residue is acid-washed with hydrochloric acid for several times, and then dried and packaged. The present invention recovers fluorine resources by adding hydrochloric acid complexing agent and the like, which does not require alkali conversion, greatly saves energy, simplifies production process, and forms high value-added product cryolite. Since high-salt wastewater is not generated, therefore There is no need to set up a high-salt recovery system, which greatly reduces the cost of sewage treatment and overcomes the shortcomings of the prior art. |