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Caustic Soda Decomposition and Leaching of Monazite in Hong-Cheon Area Deposit.  

Kim Joon-Soo (한국지질자원연구원, 자원활용ㆍ소재연구부)
Yoon Ho-Sung (한국지질자원연구원, 자원활용ㆍ소재연구부)
Kim Sung-Don (한국지질자원연구원, 자원활용ㆍ소재연구부)
Kim Chul-Joo (한국지질자원연구원, 자원활용ㆍ소재연구부)
Lee Jin-Young (한국지질자원연구원, 자원활용ㆍ소재연구부)
Publication Information
Resources Recycling / v.13, no.4, 2004 , pp. 11-16 More about this Journal
Abstract
In this study, treatment conditions for monazite concentrate in Hong-Cheon area deposit were studied with NaOH fritting decomposition and HCl leaching experiments. At condition of NaOH fritting decomposition, it was appropriate to adopt particle size of -200 mesh monazite, reaction temperature of about $460^{\circ}C$ and NaOH/TREO mole ratio of 6. In case of HCl leaching for decomposed product, it was appropriate to use hydrochloric acid of above 8N with leaching temperature of above $80^{\circ}C$, leaching time of 2 hrs and pulp density of about 10%. A rate of decomposition and leaching for monazite was above 90% under optimum conditions. Sodium phosphate compound was effectively recovered from NaOH decomposed solution, and mixed rare earth chloride solution was prepared with HCl leaching of decomposed product.
Keywords
monazite; caustic soda decomposition; hydrochloric acid leaching; mixed rare earth chloride solution;
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