A PROCESS OF SMELTING MONAZITE RARE EARTH ORE RICH IN Fe

Title:

A PROCESS OF SMELTING MONAZITE RARE EARTH ORE RICH IN Fe

Document Type and Number:

WIPO Patent Application WO/2009/021389

Kind Code:

A1

Abstract:

A process of smelting monazite rare earth ore rich in Fe in particular comprises the following steps: mixing Fe-rich monazite rare earth ore containing 8-40% Fe with concentrated sulphuric acid and adding the mixture into a calcining kiln; calcining at 231-600ºC, wherein rare earth reacts with sulphuric acid to produce rare earth sulphate which dissolves in water or a solution with a H+ concentration less than 1.5mol/L and Fe is transformed into at least one of iron sulphate, iron phosphate and iron pyrophosphate; leaching the calcined ore with water or a solution with a H+ concentration less than 1.5mol/L and filtering to obtain a solution of rare earth sulphate containing Fe and P; neutralizing the solution to recover Fe and P and to obtain pure solution of rare earth sulphate; producing single or mixed rare earth compound by extracting and separating the pure solution directly, or producing mixed rare earth carbonates by precipitation process. The process could avoid the influence of Fe on extracting rare earth. The process is simple, continuous, easy to control, low in consumption of chemical engineering materials, high in recovery ratio of rare earth and suitable for large-scale production.

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Inventors:

HUANG XIAOWEI (CN)
LI HONGWEI (CN)
LONG ZHIQI (CN)
LIU YING (CN)
ZHAO NA (CN)
ZHANG GUOCHENG (CN)

Application Number:

PCT/CN2008/000715

Publication Date:

February 19, 2009

Filing Date:

April 08, 2008

Export Citation:

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Assignee:

GRIREM ADVANCED MATERIALS CO (CN)
HUANG XIAOWEI (CN)
LI HONGWEI (CN)
LONG ZHIQI (CN)
LIU YING (CN)
ZHAO NA (CN)
ZHANG GUOCHENG (CN)

International Classes:

C22B3/00; C22B1/06; C22B59/00

Foreign References:

CN1721559A	2006-01-18
CN1009332B	1990-08-29
CN1804063A	2006-07-19
CN1405337A	2003-03-26
CN1075171A	1993-08-11
FR2826667A1	2003-01-03
RU2151206C1	2000-06-20

Attorney, Agent or Firm:

BEIJING BEIXIN-ZHICHENG INTELLECTUAL PROPERTY AGENT CO., LTD. (Xizhimen NandajieXicheng District, Beijing 5, CN)

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