[6]Research-on-730-series-frother-for-copper-sulfide-ore-separation-by-cyclonic-static-microbubble

Procedia Earth and Planetary Science 1 (2009) 771–775

https://www.360docs.net/doc/098453837.html,/locate/procedia

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The 6th International Conference on Mining Science & Technology

Research on 730 series frother for copper sulfide ore separation by

cyclonic-static microbubble flotation column

Cao Yi-jun a,*, Shang Lin-ping a , Yang Xin-hua b

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Abstract

The special requirements for frother were raised because of the higher height, thickness foam layer and highly turbulent middling circulation circumstance of cyclonic-static microbubble flotation column (FCSMC). The characteristics of 730 series frother were studied for selecting suitable frother for copper sulfide ore separation by FCSMC. And copper sulfide ore flotation experiments were tested by laboratory FCSMC. The results indicate that the foaming ability of 730C is well which can form much more gas-liquid interfaces at the same reagent dosages, 730E is the most stable frother. And frother 730C has satisfactory effect by laboratory FCSMC to separate copper sulfide ore, and the suitable gas hold-up is in the range of 22%-24%.

héó??ê??: cyclonic-static microbubble flotation column; copper sulfide ore; flotation; frother

1. Introduction

As an organic combination of column flotation and cyclonic flotation, FCSMC has broken the single “layer flow” mineralization reaction pattern of conventional flotation column, the “turbulent flow” mineralization reaction mechanism was introduced to increase recovery as well as the column flotation selectivity advantage was still reserve to improve concentrate grade [1-4]. Now FCSMC has been widely used in flotation of sulfide ore such as chalcopyrite, pyrite, galena and oxide ore such as scheelite, hematite etc. [5-8]. Because of the much higher height and thickness foam layer of flotation column than that of flotation machine, the mineraliazation particle should go through longer distance to enter concentrate, so the mineralization bubble should have adequate stability to attach itself to the mineral particle and into concentrate. And also because of the highly turbulent middling circulation circumstance, it raised special requirements for frother of FCSMC different from flotation machine.

The frother 730A is a mixture of ?, ?, 4-trimenthyl-3-cyclohexene-a-methanol, 1, 7, 7-trimethyl-bicyclo [2.2.1] heptan-2-ol, cineol, and alcohol, ethers, ketone of C6-8 at a suitable ratio. As using 730A frother, the concentrate grade increased 0.51% and the recovery of Cu increased 3.98 compared with the flotation indexes obtained by using pine oil as frother in one industry-scale flotation cell test in Gejiu [9]. And other test results by using flotaion cell in

* Corresponding author. Tel.: +86-516-83995976; fax: +86-516-83995976 . bJ?~á?=~??êé??

: yijuncao@https://www.360docs.net/doc/098453837.html, .

187- ? 2009 Published by Elsevier B.V

. doi:10.1016/j.pro .2009.09.122

85220eps Procedia Earth and Planetary Science

Open access under CC BY -NC-ND license.

=lead-zinc multimetals sulfide, copper sulfice and gold mine flotation indicated that 730A not only improve beneficiation indexes, but also decrease the forther dosage [10-11].

But in flotation column flowsheet, 730A frothers do not fit in with the separation equipment mechanism such as the higher height and the highly turbulent middling circulation circumstance, lower recovery and higher concentrate grade were obtained compared with flotation machine. The frother suitable for the FCSMC flotation should be reseached to optimize the separation circumstance of FCSMC to flotation sulfide ore.

Fig. 1. Laboratory ?100?2000mm FCSMC

2. Experimental

The 730 series frothers which are respectively 730A, 730B, 730C, 730D and 730E were produced according to

different ratio of functional groups by Kunming Metallurgy Research and New Materials Co. Ltd. The surface tension was measured by KRUSS-K100 Automatism Surface Tension Instrument made in Germany.

The airflow method was used to judge the frothers foaming ability and stability, as to make gas get across glass sand filter plate at certain flow velocity on which there was solution to be tested, then the foam was formed in the container (graduated flask) and foam height was measured. Time that the foam height attenuating to half after stopping inflation was used as foam half-life.

Copper Sulfide ore flotation experiments were tested by using laboratory FCSMC (Fig. 1), the experiment copper sulfide ore was sampled from grinding mill overflow, the Concentrator of Dahongshan Copper Mine. The gas hold-up of FCSMC was measured by the following:

1_^p m m ?ü

ερ?=?

ENF

where ? is the gas hold-up of FCSMC; PA, PB are the pressure of point A and pressure of point B, respectively; ?s is the density of pulp; g is the acceleration of gravity, and h is the height between point A and point B. 3. Result and analysis PKNK=pìê?~?é=íé??á??==

The surface tension in different frothers concentration is shown in Fig. 2.

It can be seen from Fig. 2 that the surface tensions of frother decrease as the frothers concentrations increase, but

the decrease trend gradually reduce. The surface tension of 730A solution obviously bigger than others, so the gas-

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liquid interface formed by 730A is most unstable. The abilities of other four kinds of frothers to decrease water surface tension have little distinctions.

Fig. 2. The Surface Tension in different frothers concentration

PKOK=c?~?á??=~?á?áíó==

The results of foam layer height and half-life are shown in Fig. 3 and Fig. 4, respectively.

Fig. 3 shows that the foam layer heights increase as the frothers concentrations increase, and when the frothers concentration is more than about 8 mg/l, the foam layer height of 730C is the highest than the others. It indicates that foaming ability of 730C is well which can form much more gas-liquid interfaces at the same reagent dosage. Fig. 4 shows that the foam half-life of 730E at higher concentration is largest than that of the other frothers. So the 730E is the most stable frother.

Fig. 3. The Foam Height in Differnet Frothers Concentration Fig. 4. The Foam Half-life in Differnet Frothers Concentration

PKPK=c??í~íá??=é?ééêá?é?í=á?=?á??éêé?í=?ê?íüéê=???~?é==

The FCSMC gas hold-up of different frother concentration in aqueous solution was measured. Fig. 5 shows the

influence of frother on FCSMC gas hold-up. It can be seen that the gas hold-up increases as the frother concentration increases, and the gas hold-up of 730C rises most quickly than the others.

The Influence of frother dosage on copper sulfide ore flotation by using laboratory FCSMC was tested. The fixed conditions are given in Table 1, and the influence of frother on concentrate grade, recovery and gas hold-up are shown in Fig. 6, Fig. 7, Fig. 8, respectively.

Table 1. The Fixed Conditions of Frother Dosage Parameter Collector, dosage(g/t) Feed concentration(%) Circulation pressure(MPa) Aeration rate(m 3/h) Feed speed (mL/min) Value Buthl xanthate 80 35 0.18 0.16 600

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R D P +H L J K W F P

)U RW KHU V &RQFHQW U DW L RQV SS P

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R D P +D O I O L I H V =

773C. Yi-jun et al. / Procedia Earth and Planetary Science 1 (2009) 771–775

Fig. 5. Influence of Frother on FCSMC Gas Hold-up Fig. 6. Influence of Frother on Concentrate Grade

Fig. 7. Influence of Frother on Flotation Recovery Fig. 8. Influence of Frother on FCSMC Gas Hold-up

It can be seen that the concentrate of 730A and 730B is higher than others. By comprhensive comperison frother 730C has satisfactory beneficiation index on copper sulfide flotation by using FCSMC, and the suitable gas hold-up of FCSMC is in the range between 22%-24%. 4. Conclusions

1) The foaming ability of 730C is well which can form much more gas-liquid interfaces at the same reagent dosage, and 730E is the most stable frother.

2) Under the same separation condition, using laboratory FCSMC to separate copper sulfide ore, frother 730C has satisfactory beneficiation index, and the suitable gas hold-up is in the range between 22%-24%. Acknowledgements

The authors acknowledge the financial support from the National Key Technology R&D Program in the 11th Five Year Plan of China (No. 2008BAB31B01). References

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)U RW KHU &RQFHQW U DW L RQ SSP

*D V +R O G X S

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&R Q F H Q W U D W H *U D G H

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5H F R Y H U \

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