gonzalo montes atenas 1

7/28/2019 Gonzalo Montes Atenas 1

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Applying the Splitting Technique to

determine floatability components

of an ore sample

Javier Sierra-Villalobos, Gonzalo Montes-AtenasDepartamento de Ingeniera de Minas

Facultad de Ciencias Fsicas y Matemticas

Universidad de Chile


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Introduction

Flotation kinetics

Splitting technique

Overall assay data

Mineral liberationRe-floating tests

Floatability components

(Gu, 2003)

(Garca-Zuiga, 1935; Sutherland, 1948, Loveday, 1966; Harris & Chakravarti, 1970; Finch & Dobby, 1990; Trahar,

1981; Fichera & Chudacek, 1992; King, 2001)

(Nicol et al., 1983; Deighton,

2001; Varadi, 2007)

How much, What and Where is recovered?

models based on

computed from

Release analysis(Dell, 1953)

based on

determining

Slipitting up a sample

using

(King & Schneider, 2000)

MLA

data reconciliation

determining the

state of releaseVariables

affecting

flotation

kinetics

keeping

constant

(Dell, 1953; Runge, 1997 & 2007;Franzidis et al. , 1999)Kinetics models

compared to

mass balance

applying

(Imaizumi & Inoue, 1963;

Kelsall, 1961; kelly & Carlson,

1991)

(Franzidis et al. , 1999)(De Bruyn & Modi, 1956; Harris &

Cuadros-Paz, 1978; Chander &

Polat, 1995)

(Cutting et al, 1981;

Sutherland, 1977)

to determine


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Laboratory Methodology

Tail

Feed

Con 1

Con 2

Con 3

Con 4

FFTail

SFTail

P80=213 m

P80=189 m

P80=255 m

P80=207 m

P80=271 m

R

P80=151 m

Con 1

Con 2

Con 3

Con 4

Con 5

FFCon

P80=272 m

P80=209 m

Con 1

Con 2

Con 3

Con 4

Con 5

SFCon1

SFCon2

R

R
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BATCH FLOTATION KINETICSRESULTS


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Chalcopyrite and pyrite the major

sulphide minerals in the ore

High collector dosage promoting the

flotation of all mineral particles having

the appropriate liberation of

chalcopyrite and pyrite (Dell , 1953).

Kinetics and mineralogy analyses

0

20

40

60

80

0 20 40 60 80

PyRecovery(%)

Cpy Recovery (%)

0 g/t

40 g/t

80 g/t

160 g/t

+ MLA

results


6/11

Results 1. FSM Model

= 1 1 +1

F-S Model First flotation Con1 Con3

ks (min-1) 0.3516 0.2660

kf (min-1) 2.1221 0.0657 3.0998

ms (wt.%) 0.0248 0.4843

mf (wt.%) 0.0376 0.5000 0.2499

Pearson coefficient, R2 0.9999 0.9920 0.9999

Fast-slow model (FSM) considering mass recovery as sulphides recovery

0

20

40

60

80

0 3 6 9

Cumulativerecovery(%)

Time (min)

0

20

40

60

80

0 3 6 9


Time (min)

0

2

4

6

8

0 3 6 9


Time (min)

First flotatiom Con 1 Con 3


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y = -0.0274x + 0.5427

y = -0.1452x + 0.2771

y = -0.4359x + 0.18020.02

0.05

0.14

0.37

1.00

0 2 4 6 8 10

1-R

m,s

(%)

Time (min)

Results 2. Imaizumi & Inoues gr. Model

For Con 3,

Mass of slow floating components

ms=(1-M1)*(1-(1-M2))=0.1267

Mass of intermediate floating component

mi=(1-M1)*(1-M2)*(1-(1-M3))=0.0596

Mass of fast floating component

mf=(1-M1)*(1-M2)*(1-M3)=0.2710

(*) data obtained using linear

regression.

Imaizumi and Inoue First flotation Con 1 Con 3

k1 (min-1) 0.0014 0.0478 (*) 0.0274

k2 (min-1) 0.0236 0.1452k3 (min

-1) 0.4359

M1 0.9495 0.9710(*) 0.5427

M2 0.0347 0.2771

M3 0.1802


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Results 3.Characterisation of flotation

products/concentrates

0

20

40

60

80

100

1 10 100 1000

Cpy-Pyr

ecovery(%)

Size (m)

Con1 FFCon

0

20

40

60

80

100

1 10 100 1000

Cpy-Pyrecovery(%)

Size (m)

Con3 SFCon1 SFCon2


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Conclusions

The ST was successfully applied to the Ernest Henry ore.

However, the number of repetitions and the difficulties to keep

the surface properties make the technique sensitive to the

operational procedure.

The floatability components were best described using

Imaizumi and Inoue s graphical method as it differentiates

clearly the components. FSM represents the overall results

accurately, however the floatability components depend onthe number of constant previously established.


10/11

Conclusions

Size and liberation studies of the floatability components

showed dissimilar trends when comparing the concentrates of

the first flotation test and reflotation tests. These results are

not in agreement with the study published by Dell in 1953.

The fast floating materials consisted of fully liberated

intermediate and coarse particles. The slow floating materialsconsisted of coarse particles exhibiting low liberation and low

densities as well as of highly liberated fine particles.


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Acknowledgements

JKMRC for the financial support of this study

JKMRC Students: Ana Mara Rojo and Erico Tabosa

PhD. Marco Vera

Universidad de Concepcin

Universidad de Chile

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