PROCESS FOR METALLURGY AND SEPARATING RARE EARTH CONCENTRATE USING COMBINATION METHOD
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United States of America Patent
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Issued Date -
Oct 7, 2021
app pub date -
Aug 9, 2019
filing date -
Aug 10, 2018
priority date (Note) -
Published
status (Latency Note)
Importance
Abstract
The present invention provides a process for metallurgy and separating a rare earth concentrate using a combination method, the process including: treating the rare earth concentrate containing bastnaesite by using a method including roasting under an atmosphere, leaching with hydrochloric acids, and roasting with a sulfuric acid, wherein stepping acid leaching with low-concentration hydrochloric acids is controlled during the leaching with the hydrochloric acids so as to obtain a rare earth solution with a high concentration (150-250 g/L REO), such that a leaching rate of Ce reaches 60% or more, and the content of F− in a leaching liquor is reduced by aging; and rare earth is further recovered from a leach residue by roasting with the sulfuric acid and leaching with water, and the total yield of the rare earth reaches 95% or more.
First Claim
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