外文翻譯--選礦廢水對(duì)硫化礦物浮選的影響（原文）

1、 Effect of mineral processing wastewater on flotation of sulfide minerals CHEN Jian-ming(陳建明)1, 2, LIU Run-qing(劉潤(rùn)清)1, SUN Wei(孫 偉)1, QIU Guan-zhou(邱冠周)1 1. School of Resource Processing and Bioengineering, Central South

2、 University, Changsha 410083, China; 2. Liuzhou China Tin Group Company, Limited, Liuzhou 545000, China Received 4 May 2008; accepted 20 September 2008 Abstract: The effects of mineral processing wastewater on sulfide m

3、inerals were investigated by flotation, infrared spectrometry and electrochemistry test. The results show that lead-concentrate water can improve the flotation of galena, while the sulfur-concentrate water has negative

4、 effect on flotation of galena compared with distilled water. The flotation behavior of pyrite is contrary to that of galena in three kinds of water. Infrared spectra indicate that the residual collector in the lead-con

5、centrate water is beneficial to the formation of lead xanthate on the surface of galena. Electrochemistry results indicate that electrochemistry reaction on galena surface has apparent change. The anode polarization is

6、 improved and cathode polarization is depressed. Key words: mineral processing; sulfide mineral; recycled wastewater; flotation 1 Introduction Water resource problem has become more and more important in the world becau

7、se it is closely related to human life and environment. A lot of water has been consumed and wasted in mining to obtain metal resources. Wastewater discharged from mines takes 1/10 of the total amount of the industrial w

8、astewater discharged in China[1]. The wastewater produced in mineral processing contains a lot of suspended solid particles, heavy metal ions, flotation reagents, organics and other pollutants etc, resulting in waste of

9、water resource and environmental pollution[2?6]. Therefore, wastewater treatment and reuse have much academic and practical significance. There are many reports about wastewater treatment and reuse in the past[7?13]. It

10、was shown that pellucid wastewater after physical and chemical purification could be recycled successfully. The studies of XIE et al [14] and YUAN et al[15] indicated that purified and treated wastewater by activated car

11、bon could be reused. Furthermore, the quality of Pb flotation could be improved by controlling activated carbon consumption. A lot of researches have been done in wastewater treatment and utilization of mineral processin

12、g, and much achievement has been made. However, they only focused on the technology development and the study on mineral flotation mechanism was rarely carried out. Up to now, there are few reports about the mineral proc

13、essing wastewater of different systems and sites. Wastewater is classified and disposed selectively, and then returns to the different floatation operations according to the effect of wastewater on mineral surface reacti

14、on. This method could enhance the efficiency, utilize the chemical component of wastewater, and decrease greatly the cost. It has been innovatively proposed to use the recycled water according to its characteristics. In

15、 this work, the effects of mineral processing wastewater on flotation of galena and pyrite are investigated and the reaction mechanism between reagents and mineral is discussed. 2 Experimental 2.1 Materials Galena and py

16、rite sample used in this study was from Pb/Zn mine of Fankou. These mineral samples were crushed to below 3 mm and removed to porcelain mill, then fraction of 0.147?0.045 mm was obtained by screening as flotation samples

17、. Foundation item: Project(2006AA06Z120) supported by the Hi-tech Research and Development Program of China; Project(50874117) supported by the National Natural Science Foundation of China Corresponding author: LIU Run

18、-qing; Tel: +86-13875851194; E-mail: liurunqing@126.com DOI: 10.1016/S1003-6326(08)60294-0 CHEN Jian-ming, et al/Trans. Nonferrous Met. Soc. China 19(2009) 454?457 456Fig.2 Flotation of pyrite in distilled water and re

19、cycled wastewater (c(KBX)=1×10?4mol/L) sulfur concentrate water has negative effect on flotation of galena. It can be seen from Fig.2 that, compared with the recovery in distilled water, the pyrite flotation is

20、improved in sulfur-concentrate water, but it is depressed in lead-concentrate water. This indicates that if lead-concentrate water is reused in the separation of galena and pyrite, it can enhance the separation effic

21、iency. Therefore, in recycling of mineral processing water, the origin of wastewater must be taken into account. 3.2 Infrared spectra of sulfide minerals in mineral processing wastewater The infrared spectra of galen

22、a in xanthate solution and in wastewater-xanthate solution are shown in Fig.3. The results indicate that the surfaces of galena in three water systems give similar adsorption peak. Absorption peaks of 2 955 cm?1 and

23、2 870 cm?1 contribute to the C—H asymmetry and symmetry stretching vibration. Peak at 1 466 cm?1 is derived from symmetry bend vibration of —CH3 or shear swing vibration of —CH2. Peak at 1 405 cm?1 is caused by —CH

24、3 bend vibration, and peaks of 1 206 cm?1 and 1 029 cm?1 are stretching vibration absorption peaks of C—O—C and —C=S, respectively. It also can be seen from Fig.3 that surface absorption characteristic peak of galena

25、 is broader and stronger in mineral processing wastewater. The order of infrared absorption intensity of galena in three kinds of water systems is lead-concentrate water＞distilled water ＞sulfur-concentrate water. This

26、 phenomenon is due to the fact that lead-concentrate water has residual collector, which is beneficial to the formation of lead xanthate on the surface of galena. This also indicates that collector is concerned with

27、physical and chemical reaction of galena surface. This result is in good agreement with flotation result. Fig.3 Infrared spectra of galena in three kinds of water system (c(KBX)=10?4mol/L) Infrared spectra of pyrite in

28、teracted with three kinds of water are present in Fig.4. It can be seen that there are characteristic absorption peaks of methyl and methylene at 2 963 cm?1 and 2 880 cm?1. In addition, there appear characteristic ab

29、sorption peaks at 1 290 cm?1 and 1 033 cm?1. They are caused by C=S and C—O—C stretching vibration of dixanthogen. According to XU et al[16] that C=S stretching vibration peak decreases from 1 049 cm?1 to 1 019 cm?1

30、and C—O—C stretching vibration increases to 1 240?1 290 cm?1 when xanthate is oxidized to dixanthogen. This results are in correspondence with the literature report and above flotation results. This can infer that in

31、frared absorption intensity is in the order of sulfur-concentrate water ＞ distilled water ＞ lead- concentrate water. 3.3 Corrosive electrochemistry of oxidization- reduction of galena in mineral processing wastew