外文翻譯---鉀明礬作為抑制劑從稀土精礦中選擇性回收氟碳鈰礦和獨(dú)居石 英文

1、? . Int. J. Miner. Process. 59 2000 237–245www.elsevier.nlrlocaterijminproSelective flotation of bastnaesite from monazite in rare earth concentrates using potassium alum as depressantJun Ren a, Shaoxian Song b,), Alejan

2、dro Lopez-Valdivieso b, Shouci Lu ca Center of Research on Surfaces and Interfaces, Nanjing UniÕersity, Nanjing 210093, China b Instituto de Metalurgia, UniÕersidad Autonoma de San Luis Potosi, Sierra Leona 550

3、, Lomas 2a Seccion, ´ San Luis Potosi, C.P. 78210, S.L.P., Mexico c Resources Engineering School, UniÕersity of Science and Technology Beijing, 40 Xueyuan Road, Beijing 100083, ChinaReceived 5 January 1998; rec

4、eived in revised form 17 October 1999; accepted 8 November 1999AbstractElectrokinetic and flotation studies were carried out on single particles of bastnaesite and monazite to develop a flotation scheme for selectively r

5、emoving monazite in the rare earth bulk ? concentrate from the Baiyunebo mine, in China 60.7% rare earth oxides or REO, 75% as . bastnaesite and 25% as monazite . Low additions of potassium alum were found to efficiently

6、 depress monazite at pH 5 without affecting the flotability of bastnaesite with the collector benzoic acid. The bulk concentrate was treated through this scheme, and 85% of the bastnaesite was recovered in a concentrate

7、that assayed 69.5% REO and contained 97% bastnaesite. The depressing effect of potassium alum appeared to be due to the preferential adsorption of hydrolyzed aluminum species on monazite in comparison to bastnaesite. q 2

8、000 Elsevier Science B.V. All rights reserved.Keywords: bastnaesite flotation; monazite flotation; rare earth mineral separation; alum as depressant; hydrolyzed aluminum ions) Corresponding author: Fax: q 52-4-825-4326;

9、e-mail: shaoxian@uaslp.mx0301-7516r00r$ - see front matter q 2000 Elsevier Science B.V. All rights reserved. ? . PII: S0301-7516 99 00075-7( ) J. Ren et al.rInt. J. Miner. Process. 59 2000 237–245 2392. ExperimentalThe m

10、ineral samples of bastnaesite and monazite used in this work were obtained from the Haoniuping mine and Southern rare earth mine, in China, respectively. The samples were first crushed, then cleaned using a concentrating

11、 table and a hand magnet. By sieving, 37=100 mm size particles were obtained for flotation tests, and y37 mm size particles for zeta potential measurements. Through this procedure, the purity of the bastnaesite and monaz

12、ite samples were 96.5% and 95.0%, respectively. A bastnaesite and monazite bulk concentrate, assaying 60.7% total REO, 4.3% CaO, 4.0% F and 11.5% P O , from the Baiyunebo mine, in China, was used as sample for 2 5 flotat

13、ion studies to separate bastnaesite and monazite. The concentrate, with 75.1% REO as bastnaesite and 24.9% REO as monazite, also contained 1.3% SiO and 4.3% Fe as 2 martite. In order to determine the relative proportion

14、of bastnaesite and monazite in the various flotation products, both the total REO content and the REO content of bastnaesite were assayed in the products. Benzoic acid used in this work was prepared in our laboratory and

15、 found to have ? ? . . 90.2% purity. Potassium alum KAl SO P12H O , hydrochloric acid, sodium hydrox- 4 2 2 ide and octanol were all analytical grade reagents. Flotation studies on single minerals were carried out in a 2

16、50-ml cell for 5 min using distilled water at 308C. Prior to flotation, the slurry at 4% solid was conditioned for 5 min with pH-regulating agents, depressant, collector and frother. Flotation tests on the bulk concentra

17、te were conducted in a 1-l cell using tap water. Electrokinetic studies were performed using a Mark DXD-1 electrophoretic meter, made by the Shanghai Instruments, in China. Mineral suspensions at 0.05% solids were first

18、conditioned for 5 min with pH-regulating agent in the presence or absence of potassium alum. The slurry was then transferred to the electrophoresis cell for measurement. The electrophoretic mobility of over 20 particles

19、was determined, and the average value was then trans- ? . formed to zeta potential using the Smoluchowski equation Adamson, 1990 .3. Results and discussions3.1. Flotation of bastnaesite and monaziteThe effect of pH on th

20、e flotability of single particles of both bastnaesite and monazite using benzoic acid as a collector in the presence and absence of potassium alum is shown in Fig. 1. It can be noted that both minerals present flotabilit

21、y peaks about pH 5 in the absence of potassium alum. These results indicate that there is no selectivity between bastnaesite and monazite in the whole pH range studied if only the collector benzoic acid is used. However,

22、 with 300 mgrl potassium alum, monazite is strongly depressed, while the flotability of bastnaesite is affected only slightly. Around pH 5, the flotability difference between the two minerals is over 60%. Clearly, potass