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居石

1、附錄 附錄 ASelective flotation of bastnaesite from monazite in rare earth concentrates using potassium alum as depressantJun Ren a, Shaoxian Song b, Alejandro Lopez-Valdivieso b,Shou ci Lu caCenter of Research on Surfaces an

2、d Interfaces, Nanjing Uni?ersity, Nanjing 210093, ChinabInstituto de Metalurgia, Uni?ersidad Autonoma de San Luis Potosi, Sierra Leona 550, Lomas 2a Seccion, ´San Luis Potosi, C.P. 78210, S.L.P., MexicocResources En

3、gineering School, Uni?ersity of Science and Technology Beijing, 40 Xueyuan Road, Beijing100083,China.AbstractFlotation studies were carried out on single particles of bastnaesite andmonazite to develop a flotation scheme

4、 for selectively removing monazite in the rare earth bulkconcentrate 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 t

5、o efficiently 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

6、 concentrate 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 bas

7、tnaesite.Keywords: bastnaesite flotation; monazite flotation; rare earth mineral separation; alum as depressant;hydrolyzed aluminum ions.1. Introduction1. Introductionseparation between the two minerals. Of all the inorg

8、anic and organic depressants tested,potassium alum was found to be the most promising depressant.This paper shows the results on the applicability of potassium alum as a depressant inthe selective flotation of bastnaesit

9、e from monazite in a rare earth bulk concentrate using benzoic acid as a collector. In addition, the methodology used to establish the flotationscheme for the separation process through studies on flotability of single p

10、articles of both bastnaesite and monazite is presented.2. ExperimentalThe mineral samples of bastnaesite and monazite used in this work were obtainedfrom the Haoniuping mine and Southern rare earth mine, in China, respec

11、tively.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 thebastnaesite and monazite samples wer

12、e 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 25flotation studies to sepa

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

14、nazite in thevarious 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 found to have 90.2% pu

15、rity. Potassium alum (KAl (SO4)2.12H2O), hydrochloric acid, sodium hydrox-ide and octanol were all analytical grade reagents.3. Results and discussions3.1. Flotation of bastnaesite and monaziteThe effect of pH on the flo

16、tability 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 flotability pea