Decomposition of Monazite Sand

[摘要] The purpose of this investigation was to study the sulfuric acid digestion of monazite sand, and to prepare rare-earths-thorium containing material from the resulting solution which would be suitable for further preparation of thorium and rare earth elements by ion-exchange. Digestion of crude monazite sand was treated in 95% sulfuric acid for 2.0 hours at 150¡­250¡É. The acid to sand weight ratio were 1 : 1.9¡­2.8. Optimum condition was 95% sulfuric acid for 2.0 hours at 200¡¾5¡É. Within this conditions monazite sand was decomposed up to 99%.

[学科分类] 化学（综合）