The application of the normal hydrothermal and microwave hydrothermal process to recover the total oxides of the rare earths from monazite in Quang Nam by acids HCl, HNO3, H2SO4 and alkali NaOH have been studied. Research results show that the best conditions to obtain the total rare earth oxide in Quang Nam and with the highest performance microwave hydrothermal metallurgy ore monazite in Quang Nam particle size < 0,076mm in the rate of 12M H2SO4 /ore is 5:1 (ml/g) in 60 minutes in the microwave power 450W. | JOURNAL OF SCIENCE, Hue University, Vol. 69, No. 6, 2011 RECOVERY OF THE TOTAL OXIDES OF THE RARE EARTHS FROM MONAZITE IN QUANG NAM Vo Van Tan1 and Truong Thi Cao Vinh2 1 College of Education, Hue University 2 Quang Nam University Abstract. The application of the normal hydrothermal and microwave hydrothermal process to recover the total oxides of the rare earths from monazite in Quang Nam by acids HCl, HNO3, H2SO4 and alkali NaOH have been studied. Research results show that the best conditions to obtain the total rare earth oxide in Quang Nam and with the highest performance microwave hydrothermal metallurgy ore monazite in Quang Nam particle size < 0,076mm in the rate of 12M H2SO4 /ore is 5:1 (ml/g) in 60 minutes in the microwave power 450W. 1 Introduction In Viet Nam, the rare earths reserve from central provinces of coastal mineral sand are rather high [1, 3, 4, 5]. In Quang Nam, central coastal mineral sand is disposed mainly from the area of Cua Dai coast in Cam An, Hoi An to Dung Quat pool. This mineral sand gather in long, narrow strips along water edge, which is convenient for exploitation. The main ingredients in mineral sand are quarts, ilmenit, zircon, rutin and monazite containing the rare earths element. Mineral mines rich in the rare earth elements are located in Northern Cua Dai and Ky Ha in Tam Hai, Nui Thanh. The content of the rare earths such as Er, Pr, Gd, in the total oxides of the rare earths from monazite Quang Nam are of high economic value and ocupy a high percentage [6][7]. With the hope of having some contribution in collecting the rare earth elements, we, within this article, introduce some results from our research. 2 Experiments The chemicals, tools and equipments - NaOH, NH4OH, H2C2O4, CH3COOH, HCl, H2SO4, HNO3 have PA. - The glassware, pHmet, ore refining mills PM400/2 heat proof, 12000C, incinerator, microwave farnace NE-5670 has 2,45 GHZ frequency, 100-800W power. 101 Experiments In Quang Nam, monazite .
