|
|
|
|
| Rare Earth
Separation and Extraction |
 |
The research
on separation and extraction for rare earth has
been standing at leading status in China. A number
of achievements won awards and have been applied
and transferred to production. One of them won the
State Invention Award (2nd class), one of them won
the State Science & Technology Advance Award
(2nd class), six if them won the Ministerial Science
& Technology Award (2nd class or 3rd class).
The major achievements and recommended processes
are as follows:
Process for Purification
of Rare Earth Oxide |
|
16 rare earth
oxides with high purity (99.999% ~ 99.9999%) can be prepared
by extraction, extract-chromatography, oxidation, reduction
or ion-exchange.
All rare earth Separation Process
for Various Rare Earth Resource
All-rare earth separation process can be applied for the
concentrates of various rare earth resource such as bastnasite,
monazite and ion-type ore. Besides, grouping process can
be supplied according to the user's request.
Process for Preparation of Y2O3
with Fluorescent Grade
With fluorescent grade can be obtained by extraction.
In addition, grouped concentrate or individual rare earth can
be prepared. This all rare earth separation technology
has been exported to Germany.
Process of Production of Ce-Zr
Compound
The process can produce Ce-Zr compound powder with large
special surface area and stability at high temperature,
which is used as sub-catalyst for catalyse transformation
material of automobile exhaust.
Electrolytic Reduction-Basicity
Method Preparing High-purity Europium Oxide
In 1960's, CREM invented Reduction by Zinc Powder-Basicity
Method to prepare high-purity europium oxide. The method
has been adopted widely in rare earth plants. In order to meet
the need of high clarity display, a new method, Electrolytic
Reduction-Basicity Method is developed to produce higher-purity
europium oxide. The method can avoid the contamination
of zinc to the product and enhance the purity of the product.
Now, a production line adopting the method is being built
up in Gansu Rare Earth Company. Its productive capacity will be
up to 15 tons europium oxide annually.
Recent and next work:
Study on the recycle of rare earth
compound and material
Study on the rare earth super fine
material
|
|
|
|
