Monazite is a rare earth minerals and thorium phosphate chemical molecule expression is (Ce, La, Th) PO 4. Analysis of its chemical composition, monazite rare earth concentrate has the following characteristics:
1. The mineral content of monazite in the concentrate can reach 95% to 98%, of which REO is 50% to 60%;
Second, the strontium element accounts for 95% to 98% of the total amount of rare earth elements.
Third, containing more radioactive elements Th, U and trace amounts of Th and U radioactive decay products Ra, of which 4% to 12% ThO 2 , O.3% ~ 0.5% U 3 O 8 ;
Fourth, high phosphorus, 25% ~ 27% P 2 O 5 ;
Five, contain small amounts of rutile (TiO 2), titanium-iron ore (FeO · TiO 2), zircon (ZrO 2 · SiO 2) and quartz (SiO 2) and other minerals.
Since the chemical properties of rare earth phosphates are very stable, the decomposition methods employed in the industry are mainly sulfuric acid or soda ash roasting and sodium hydroxide decomposition. Now widely used in the production of sodium hydroxide decomposition methods.
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