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2 258 038

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(51)

IPC

(21) (22)

Application

2003135829/15, 2003-12-10

(24)

Start date

2003-12-10

(22)

Actual filing date

2003-12-10

(45)

Published

2005-08-10

(72)

Inventor

Lebedev V.N.

(73)

Holder

Institut Khimii I Tekhnologii Redkikh Ehlementov I Mineral'Nogo Syr'Ja Im. I.V. Tananaeva Kol'Skogo Nauchnogo Tsentra Rossijskoj Akademii Nauk

BRAZILLITE CONCENTRATE PURIFICATION PROCESS Russian patent published in 2005 - IPC

Abstract RU 2258038 C1

FIELD: mining industry.

SUBSTANCE: invention relates to brazillite concentrate purification technology, including removal of radioactive impurities. Concentrate is treated with potassium hydroxide at concentrate-to-alkali weight ratio 1:(0.05-0.5) and 150-250°C. Treated product is washed with water, treated with 5-15% aqueous hydrochloric acid or sulfuric acid at 50-100°C, separated by gravity, dried, calcined at 800-900°C, and subjected to magnet separation.

EFFECT: increased degree of radioactive impurity and silicon impurity removal as well as removal of other impurities, including iron, even at high content thereof in concentrate.

4 cl, 4 ex

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RU 2 258 038 C1

Authors

Lebedev V.N.

Dates

2005-08-10—Published

2003-12-10—Filed