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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 39, Number 12
JKCSEZ 39(12)
December 20, 1995 

 
Title
A Study on the Characterization of the Mixed-Oxide Prepared from Monazite

모나자이트로부터 파생된 희토류 혼합산화물의 특성
Author
Young-Shik Kwon, Yeun-Shik Kim, Dong-Su Kim

권영식, 김연식, 김동수
Keywords
Abstract
알카리 fritting법에 의해 모자나이트로부터 얻은 희토류혼합산화물을 대상으로 하여 활용면을 고려한 그 물질의 주요 특성을 조사하였다. 그 결과 이 물질은 희토류원소의 산화물고용체로서 그 구조는 형석구조이며, 밀도는 6.75g/cm3이다. 분말상태인 이 물질은 평균입도가 약 1 ㎛인 균일한 미립으로 구성되어 있다. 이 물질은 가열처리함에 따라 결정성은 향상되었으며 염산에 의한 용해도는 반대로 감소함을 알게되었다. 이 물질을 단시간(30분)내로 완전히 수용액화하려면 진한 염산속에서 70℃ 이상 가열을 요한다. 제타전위의 측정 결과 이 물질의 수용액에 있어서의 등전점(I.E.P.)은 pH8.6에 있음을 알게 되었다.

The physico-chemical nature of the rare earth oxide which was produced by the caustic fritting of monazite was studied to furnish fundamental data that are required for its efficient use and processing. It was found that the material which was mainly constituted of light rare earths and thorium was a solid solution phase of oxide whose structure was fluorite-type face centered cubic. Its density was 6.75 g/cm3 and it had a uniform particle size distribution at around 1 ㎛. The crystallinity improved by heating to elevated temperatures, whereas the solubility in HCl decreased as the crystallinity improved. Complete dissolution in conc. HCl solution in short time (30 min.) was attained by heating to 70℃. The measurement of zeta potential showed its I.E.P. to be at pH 8.6 of the suspension.

Page
946 - 954
Full Text
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