Grirem Advanced Materials Co., Ltd.

Grirem Hi-tech Co., Ltd.

Rare Earth Functional Materials (xiong'an) Innovation Center Co., Ltd.

Yongqi Zhang

Xiaowei Huang

Zongyu Feng

Hao Wang

Meng Wang

Hongwei Li

He Fang Zhang

Yang Xu

Liangshi Wang

Xu Guang Sun

Yongke Hou

Meisheng Cui

Qiang Zhong

Longsheng Zhao

Zhizhe Zhai

Chao Xia

Xiangsheng Liu

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.

Process for metallurgy and separating rare earth concentrate using combination method

The present invention discloses a rare-earth-manganese/cerium-zirconium-based composite compound, a method for preparing the same, and a use thereof. The composite compound is of a core-shell structure with a general formula expressed as: A REBO-(1-A)CeZrMO, wherein 0.1≤A≤0.3, preferably 0.1≤A≤0.2; a shell layer has a main component of rare-earth manganese oxide with a general formula of REMnO, wherein RE is a rare-earth element or a combination of more than one rare-earth elements, and B is Mn or a combination of Mn and a transition metal element, 1≤a≤8, 2≤b≤18, and 0.25≤c≤4; and a core has a main component of cerium-zirconium composite oxide with a general formula of CeZrMO, wherein M is one or more non-cerium rare-earth elements, 0.1≤x≤0.9, 0≤y≤0.3, and 0.01≤z≤0.3. The composite compound enhances an oxygen storage capacity of a cerium-zirconium material through an interface effect, thereby increasing a conversion rate of a nitrogen oxide.

Rare-earth-manganese/cerium-zirconium-based composite compound, method for preparing same and use thereof

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Beijing, China

Yongqi Zhang