Recovery of Unroasted Zinc Sulfide From an Acid-Leach Residue by Flotation

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RECOVERY OF* UNROASTED ZINC SULFIDE FROM AN ACID-LEACH RESIDUE BY FLOTATION

by CHESTER FRESHOUR

22201

'

A Thesis Submitted to the Dscsrtment of Mineral Dressing in Partial Rilfillment of che Requirements for the Degree of Master of Science' in Mineral Dressing Engineering

MONTANA SCHOOL OF MINES Butte, Montana June 9, 1950

LIBRARY-T"\\T'/

The p a r t i c l e s i z e analysis.by sedimentation of a sample from the underflow of the acid-leach t h i c k ener tanks a t Anaconda revealed that 54.12 per cent -21-

of the solid p a r t i c l e s were in the minus 13-r.icron range (see Ta^ls 2 ) . 6.

The s a t i s f a c t o r y recovery of sulfide sulfur from a zinc leach residue can be obtained without recourse to a grinding operation.

7.

The conditioning time for the reagent minerec A should be from 25 to 30 minutes.

8.

A proposed flowsheet flotation

f o r t h e i n c o r p o r a t i o n of a

operation i n a two-stags leaching

process

i s shown i n F i g u r e 3 .

RECOMMENDATIONS FOR FUTURE INVESTIGATIONS The f o l l o w i n g r e c o m m e n d a t i o n s a r e made f o r f u t u r e vestigations

1.

in-

on t h i s p r o b l e m :

Several f l o t a t i o n t e s t s should be made to determine the b e s t reagents t o be used i n a cleaner c i r c u i t .

2.

F l o t a t i o n t e s t s should be made on a sample of the underflow of the acid-leach thickener tanks from the zinc leaching p l a n t at Anaconda to compare the r e s u l t s wit±t those obtained with the laboratory leach residues.

22001

-22

!

Acid Leach Acid Thickeners Overflow

Plgot Conditioner

Return to Leaching Operations

Minerec A

Flotation Cells Rougher Concentrate

Talllng3 To Pb Smelter

Reagent 301 Sodium Silicate flotation Cells Tailings

Concentrate Thickener Filter Overflow

Return to Leaching Operations

Cake To Roasters

Figure 3.—Proposed F l o t a t i o n Flowsheet for Two-Stage Leaching P l a n t . -23-

APPENDIX '1

The results, reagent consumption, and flotation conditions of the flotation tests for each leach residue are combined into single tables in the appendix.

The conditions and

assays for the acid leaches conducted in the laboratory are also listed.

-24

Taole No. 9 No. of Leach

Weight of Calcine gm.

Amount of Acid liters

Ll

3500

12

3*

5.6

L2

2990

14

4

5.2

L3

2950

13

H

5.2

L4

3300

14

3*

4.8

L5

3320

14

4

5.1

L6

3560

14

3i

4.5

L7

3950

14

4

5.3

L8

3400

14

3*

5.5

L9

3400

' 14

3

5.3

LIO

3450

14

3*

5.2

a

Time of Agitation hours

Leach Charges

25

pH of Solution After Leaching

Table No. 10

Product

Oz. Au

Oz. Ag

Head Sample

0.04

4.3

Residue Ll

0.06 0.18

*

Residue L2

'% Pb" • ^"Zn

% Fe

% Sulfide S

6.3

53.4

6.8

0.4

4.4

3.5

34.8

7.6

0.6

16.3

11.4

15.0

20.4

1.3

Head Sample

1.3

-Residue L3

—

—

1 1 . 6 5 24.12

—

4.95

, Head Sample

—

—

—

57.23

—

1.5

Residue L4

—

—

11.5

23.4

—

4.3

Residue L5

—

--

—

22.6

—

4.1

Residue L6

--

—

—

27.7

—

4.5

Residue L7

—

—

_-

20.0

mm mm

4.7

Residue L8

—

--

—

22.5

—

4.2

Residue L9

—

- —

—

21.1

20.4

5.0

Residue LIO

—

—

9.7

22.5

20.0

4.9

A. C. M. Residue 1

—

—

—

18.0

15.8

0.2

™* * "

*•"•

*••"

16.6

A. C. M. Residue 2

0.5 ""

Assays of Head Samples and Leach Residues

-26-

Table No. 11 roduct

height Grams

height jo

Heads

i

Oz. Au

Assay I'er Oz. Ag % Zn

-ent Jo Fe

Jo Pb

fo S.S

0.06

4.4

34.3

7.6

3.5

0.6

Concentrate Ll-1 Ll-1 Tailings Composite Ll-1

76.2 280.1 356.3

21.39 78.61 100.00

0.12 0.02 0.04

17.6 5.4 8.0

23.6 37.4 34.9

17.3 11.2 12.5

12.0 4.5 6.1

0.7 0.5 0.5

Concentrate Ll-2 Ll-2 Tailings Composite Ll-2

42.6 288.7 331.3

12.86 87.14 100.00

0.16 0.08 0.09

22.0 6.8 8.7

24.7 37.1 35.5

15.6 13.8 14.0

11.0 5.6 6.3

1.2 0.5 0.6

Concentrate Ll-3 Tailings Ll-3 Conposite Ll-3

86.5 237.4 359.9

24.03 75.97 100.00

0.04 0.06 0.06

15.8 6.6 S.S

25.3 40.8 37.2

16.7 13.5 14.2

10.6 4.2 5.7

0.4 0.4 0.4

Concentrate Ll-4 Tailings Ll-4 Composite Ll-4

22.8 348.3 371.6

6.14 93.36 100.00

0.36 0.04 0.06

31.5 4.6 6.2

37.8 41.7 41.4

3.4 11.5 11.0

1.6 4.0 3.3

1.8 0.8 0.8

w

Assay and h e i g h t P e r Cent Leach Ll

Table No 12

Product % Au

Distribution Per Cent % Ag %Zn j Fe % Pb

% S.S

Concentra te Ll-1

62.01

47.00

14.44

29.59

42.05

27.59

Tailings

* Ll-1

37.99

53.00

85.56

70.41

57.95

72.41

Concentrate Ll-2

22.79

32.32

8.95

14.30

22.47

26.16

Tailings

Ll-2

77.21

67.68

91.05

85.70

77.53

73.84

Concentrate Ll-3

17.41

43.09

16.67

28.12

44.39

24.03

Tailings

Ll-3

82.59

56.91

83.33

71.88

55.61

75.97

Concentrate Ll-4

37.06

30.94

5.60

1.90

2.55

12.83

Tailings

62.94

69.06

94.40

98.10

97.45

87.17

Ll-4

D i s t r i b u t i d n Per Gent Leach Ll

-28-

Table No. 13

Reagents Ll-1

Pounds Per Ton Ll-3 Ll-2

Ll-4

Copper Sulfate

1.01

1.09

1.00

0.97

Eucalyptus Oil

0.12

0.12

0.11

—

0.17

8.00

Sodium Silicate

—

—

Reagent 301

—

—

—

0.09

Pine Oil

**•»

—-

—

0.31

Reagents for Ll Flotation Tests

Table No. 14

Solids

Test

Conditioning Time Min.

Flotation Time Min.

Ll-1

3

20

6.2

12.90

Ll-2

5

8

6.0

12.23

Ll-3

7

13

6.1

12.75

Ll-4

12

3

6.2

14.75

pH

%

F l o t a t i o n Conditions for Ll

-29-

T a b l e N o . 15

Product

"TfeTglTE Grams

WeigEE %

Heads C o n c e n t r a t e L2-1

Q z . Ai

Assay P e r Cent O z . Ag % .Zn % Fe

% Pb

% S.S

0.18

16.3

15.0

20.4

11.4.

1.3

37.2

20.16

0.20

23.0

15.0

22.2

14.0

0.9

Tailings

L2-1

147.3

79.94

0.14

15.1

13.3

21.3

12.0

1.3

Composite

L2-1

184.5

100.00

0.15

16.7

13.6

21.5

12.4

1.2

C o n c e n t r a t e L2-2

70.8

22.93

0.24

23.2

13.0

20.7

14.8

1.0

Tailings

L2-2

238.0

77.07

0.14

14.1

13.5

22.0

11.8

1.3

Composite

L2-2

308.8

100.00

0.16

16.2

13.4

21.7

12.5

1.2

A s s a y and W e i g h t

Cent Leach L2

Table No. 16

Product

^ Au

D i s t r i b u t i o n Per Cent % Ag % Zn % Fe ^ Pb

% S.S

Concentrate L2-1

26.49

27.75

22.14

20.81

22.73

14.86

Tailings

L2-1

73.51

72.25

77.86

79.19

77.27

85.14

Concentrate L2-2

33.78

32.87

22.27

21.87

27.17

18.62

Tailings

66.22

67.13

77.75

78.13

72.83

81.38

L2-2

D i s t r i b u t i o n Per Cent Leach L2

Remarks:

The e n t i r e leach residue was conditioned for 8

minutes with 3 pounds per ton of ore of Reagent 801.

Pine o i l

was used as a f r o t h e r In the amounts of 0.62 pounds per ton of ore for the f i r s t t e s t and 0.37 pounds per ton of ore for the second t e s t .

The f l o t a t i o n time for both t e s t s was 4 minutes.

Both t e s t s were made a t a pH of 5.6 and a per cent s o l i d s of 13.10.

-31-

Table No. 17

Product

Weight Grams

Weight %

Assay Per Cent % Zn % Pb % S.S

C o n c e n t r a t e L3-1

194.8

27.47

54.8

2.8

15.1

Tailings

L3-1

514.2

72.53

12.5

15.0

1.1

Composite

L3-1

709.0

100.00

24.1

11.7

5.0

Assay and Weight Per Cent Leach L3

Table No. 18

Product

' ' d i s t r i b u t i o n ' *% % Zn % Pb % S.S

C o n c e n t r a t e L3-1

62.41

6.60

83.87

Tailings '

37.59

93.40

16.13

L3-1

D i s t r i b u t i o n Per Cent Leach L3 Remarks:

Since t h i s l e a c h was contaminated by a p i e c e of

m e t a l t u b i n g u s e d f o r a e r a t i o n , no- head sample was t a k e n . Copper s u l f a t e was added i n the amount of 2 . 8 2 pounds, and sodium s i l i c a t e was added i n the amount of 12.82 pounds p e r ton of o r e .

The p u l p was c o n d i t i o n e d f o r 10 minutes and

f l o a t e d f o r 5 m i n u t e s a t a pH of 5.2 and a p e r c e n t s o l i d s of 2 2 . 4 5 . -32-

Table No. 19

Product

Weight Grams

Weight %

Heads

Assay % Sulfide Sulfur

Distribution

4.30

100.00

C o n c e n t r a t e L4-1

47.4

38.79

3.00

30.66

Tailings

L4-1

74.8

61.21

4.30

69.34

Composite

L4-1

122.2

100.00

3.79

100.00

C o n c e n t r a t e L4-2

20.4

15.01

2.60

9.86

Tailings

L4-2

115.5

84.99

4.20

91.14

Composite

L4-2

135.9

100.00

3.95

100.00

C o n c e n t r a t e L4-3

35.8

15.64

10.50

42.82

Tailings

L4-3

193.0

84.36

2.60

57.18

Composite

L4-3

228.8

100.00

3.83

100.00

C o n c e n t r a t e L4-4

38.8

17.71

9.70

40.24

Tailings

L4-4

'180.3

82.29

3.10

59.76

Composite

L4-4

219.1

100.00

4.26

100.00

C o n c e n t r a t e L4-5

24.8

16.74

17.20

75.87

Tailings

L4-5

117.3

83.26

1.10

24.12

Composite

L4-5

142.1

100.00

3.79

100.00

A

ssay and Weight Distribution Per Cent Leach L4

-33

Table No. 20

Reagents Copper S u l f a t e

Pounds Per Ton L4-3 L4-4

L4-1

L4-2

16.37

14.71

8.83

Starch Sodium S i l i c a t e

32.74

Eucalyptus Oil

2.36

L4-5

9.15

14.07

4.58

7.04

0.915

.1.407

29.42- 17.66 3.94 4.42

Reagent 301 Minerec A

1.37

Pine Oil

1.14

1.27

1.22

Reagents for L4 F l o t a t i o n Tests

Table No. 21

Test

Conditioning Time Min.

Flotation Time Min.

pH

•% Solids

L4-1

30

10

5.4

4.31

L4-2

13

10

5.4

5.38

L4-3

10

10

5.4

8.21

L4-4

10

7

4.7

7.76

L4-5

10

7

5.3

4.95

Flotation Conditions for L4

-34

Table No. 22

Product

Weight Grams

Weight

Assay %

Distribution

%

Sulfide

%

Sulfur Heads C o n c e n t r a t e L5-1

4.10

100.00

66.2

30.76

8.00

44.37

Tailings

L5-1*

149.0

69.24

4.60

55.63

Composite

L5-1

215.2

100.00

5.55

100.00

C o n c e n t r a t e L5-2

64.1

29.11

9.70

68.88

Tailings

L5-2

156.1

70.89

1.80

31.12

Composite

L5-2

220.2

100.00

4.09

100.00

C o n c e n t r a t e L5-3

31.7

20.68

10.00

50.07

Tailings

L5-3

121.6

79.32

2.60

49.93

Composite

L5-3

153.3

100.00

4.13

100.00

C o n c e n t r a t e L5-4

39.5

21.60

Tailings

L5-4

143.4

78.40

0.50

10.42

Composite

L5-4

182.9

100.00

3.76

100.00

C o n c e n t r a t e L5-5

37.5

30.69

10.90

84.28

Tailings

L5-5

84.7

69.31

0.90

15.72

Composite

L5-5

122.2

100.00

3.97

100.00

15.6

Assay and Weight D i s t r i b u t i o n Per Cent Leach L5

-35

89.58

Table No. 23

Reagents

Pounds Per Ton L5-3 L5-4

L5-5

L5-1

L5-2

Copper Sulfate

9.29

9.08

13.05

I D ; 93

8.19

Starch

4.66

9.08

13.05

10.93

8.19

—

—

26.10

21.86 16.37

0.37

0.36

0.52

—

—

—

—

—

4.00

2.79

B a r r e t t No. 4

0.45

0.44

0.25

0.53

—

Frother 70

0.25

0.24

0.087

0.29

0.65

——

——

—-

——

1.41

Sodium § i l l c a t e Reagent 301 Minerec A

Pine Oil

Reagents for L5 Flotation Tests

Table No. 24

Test

Conditioning Time Min.

FIcraxiion Time Min.

pH

% Solids

L5-1

10

10

5.4

8.21

L5-2

15

5

4.9

8.48

L5-3

15

7

5.4

5.93

L5-4

15

5

5.3

6.80

L5-5

10

10

5.4

4.76

F l o t a t i o n Conditions for L5

Table No. 23

Reagents L5-1

Pounds Per Ton L5-2 L5-3 L5-4

Copper Sulfate

9.29

9.08

13.05

10r.93

8.19

Starch

4.66

9.08

13.05

10.93

8.19

—

—

26.10

21.86 16.37

0.37

0.36

0.52

—

—

—

—

—

4.00

2.79

B a r r e t t No. 4

0.45

0.44

0.25

0.53

—

Frother 70

0.25

0.24

0.087

0.29

0.65

„_

>*»_

__

1.41

Sodium § i l i c a t e Reagent 301 Minerec A

Pine Oil

__

L5-5

Reagents for L5 Flotation Tests

Table No. 24

Test

Conditioning Time Min.

Fior,at;ion Tine Min.

pH

% Solids

L5-1

10

10

5.4

8.21

L5-2

15

5

4.9

8.48

L5-3

15

7

5.4

5.93

L5-4

15

5

5.3

6.80

L5-5

10

10

5.4

4.76

Flotation Conditions for L5

-36-

Table No. 26

Reagents L6-1

Pounds Per Ton L6-2 L6-3 L6-4

Copper Sulfate

7.84

8.02

6.29

8.66

Sodium Sulfide

0.78

0.80

—

—

Starch

7.84

—

—

8.66

15.68

«*«

--

Glue

—

1.20

0.93

—

Reagent 301

—

—

—

0.52

Minerec A

1.34

1.37

1.07

—

Pine Oil

0.45

0.23

0.18

0.25

00.21

—

—

—

—

0.17

0.27

0.19

Sodium S i l i c a t e

Frother 70 Reagent 712

* *

MM

Reagents for L6 Flotation Tests

Table No. 27 Test

u o n d i t i o n i ng Time Min.

Flotation Time Min.

PIT

% Solids

L6-1

10

7

5.4

9.37

L6-2

10

5

5.0

8.47

L6-3

10

8

5.4

10.65

L6-4

10

8

5.3

8.06

Flotation Conditions for L6 -38-

Table No. 28

Product

Weight Grams

Weight 1°

Assay % Sulfide Sulfur

Distribution %

*

Heads

4.70

100.00

Concentrate L7-1

23.8

17.51

7.80

40.82

Tailings

L7-1

112.1

82.49

2.40

59.18

Composite

L7-1

135.9

100.00

3.35

100.00

Concentrate L7-2

29.0

18.02

13.30

57.06

Tailings

L7-2

131.9

81.98

2.20

42.94

Composite

L7-2

160.9

100.00

4.20

100.00

Concentrate L7-3

45.6

29.40

11.90

75.59

70.60

1.6

24.41

Tailings

L7-3

109.5 .

Composite

L7-3

155 : .l

100.00

4.60

100.00

Concentrate L7-4

36.3

22.65

13.30

70.88

Tailings

L7-4

124.0

77.35

1.6

29.12

Composite

L7-4

160.3

100.00

4.70

Assay and Weight Distribution Per Cent Leach L7

-39

100.00

Table No. 29

n

eagents

Pounds Per Ton L7-4 L7-3

L7-1

L7-2

Copper Sulfate

14.72

12.43

Starch

14.72

Sodium S i l i c a t e

—

12.90

6.24

—

—

12.43

—

12.90

—

*

Reagent 301

0.47

0.35

—

Minerec A

1.08

—

2.19

1.21

Pine Oil

0.42

0.36

0.37

0.08

Reagent 712

0.64

0.27

0.28

0.12

—

Reagents for L7 F l o t a t i o n Tests

Table No. 30 Test

Conditioning Time Min.

Flotation Time Min.

pH

%

Solids

L7-1

10

8

4.9

4.47

L7-2

7

8

5.0

5.29

L7-3

15

8

5.0

5.32

L7-4

10

8

5.0

5.82

F l o t a t i o n Conditions for L7

-40-

Table No. 31

Weight Grams

Product

WeightAssay jfc^iatributi on % Sulfide % Sulfur

Heads C o n c e n t r a t e L8-1

4.20

100.00

97.5

35.36

8.40

79.29

Tailings

L8-1

178.2

64.64

1.20

20.71

Composite

L8-1

275.7

100.00

3.70

100.00

C o n c e n t r a t e L8-2

82.7

31.20

11.90

91.52

Tailings

L8-2

182.4

38.80

0.50

8.48

Composite

L8-2

265.1

100.00

4.10

100.00

C o n c e n t r a t e L8-3

53.9

22.98

14.30

94.09

Tailings

L8-3

1,80.7

77.02

0.10

5.11

Composite

L8-3

234.6

100.00

3.50

100.00

C o n c e n t r a t e L8-4

16.2

14.79

Tailings

L8-4

93.3

85.21

0.05

1.24

Composite

L8-4

109.5

100.00

3.40

100.00

23.0

Assay and Weight D i s t r i b u t i o n P e r Cent Leach L8

-41-

98.76

Table No. 32

Reagents L8-1 Copper Sulfate Sodium Fluoride

wmmm

0.36 —

Reagent 301

Pounds Per Ton L8-3 L8-2 —

0.38

0.85

0.91

0.43

0.37 0.05

—

m*m+

Minerec A

1.24

1.29

1.46

Pine Oil

0.21

0.22

0.25

Reagent 712

0.16

B-24

--

L8-4

—

0.46 —

—

0.09

•BOB

0.10

--

Reagents for L8 Flotation Tests

Table No. 33 Test

Conditioning Time Min.

Flotation Time Min.

pH

% Solids

L8-1

10

7

5.4

8.88

L8-2

20

10

5.3

9.18

L8-3

20

10

5.4

8.11

L8-4

25

10

5.4

4.22

Flotation Conditions for L8

42-

Table No. 34

Product

Weight Grams

Weight %

Heads Concentrate L9-1

Assay Per Cent % Zn % Fe % S.S 21.1

20.4

5.0

44.6

24.65

38.1

11.5

16.8

Tailings

L9-1

136.5

75.37

14.9

21.6

0.3

Composite

L9-1

181.1

100.00

20.6

191.1

4.4

Concentrate L9-2

52.2

28.71

36.0

13.0

14.9

Tailings

L9-2

129.6

71.29

17.9

,22.0

0.4

Composite

L9-2

181.8

100.00

23.0

19.4

4.6

Concentrate L9-3

78.6

33.89

33.1

14.4

12.5

Tailings

L9-3

153.3

66.11

18.5

22.6

0.5

Composite

L9-3

231.9

100.00

23.4

19.8

4.6

Concentrate L9-4

'75.3

31.60

33.4

13.0

13.6

Tailings

L9-4

163.0

68.40

18.2

22.2

-1.0

Composite

L9-4

• 238.3

100.00

23.0

19.3

5.0

Assay and Weight Per Cent Leach L9 Note:

S.S stands for sulfide sulfur.

-43-

T a b l e N o . 35

Di t r i b u t i o n % % Zn % Fe % S. S

Product Concentrate L9 1

45.52

14.82

94.82

Tailings

L9 •1

54.48

85.18

5.18

C o n c e n t r a t e L9 2

44.89

19.22

93.75

Tailings

L9 2

55.11

80.78

6.25

Concentrate L9 •3

47.89

24.57

92.78

L9 •3

52.11

75.43

7.22

C o n c e n t r a t e L9 4

45.88

21.29

86.26

Tailings

54.12

78.71

13.74

Tailings

L9 4

D i s t r i b u t i o n P e r Cent Leacii L9

Table No. 36

Reagents L9-1

Pounds Per Ton L9-2 L9-3 L9-4

0.77

0.77

0.60

0.59

Sodium Fluoride

—

0.55

0.43

0.43

Copper Sulfate

—

—

0.86

0.84

Reagent 301

—

—

—

Minerec A

0.0084

Reagents for L9 Flotation Tests

Table No. 37

Test

Conditioning TimeMin.

Flotation Time Min.

pH

% Solids

L9-1

30

5

5.4

6.47

L9-2

30

6

5.2

6.49

L9-3

25

6

5.3

8.45

L9-4

25

5.3

8.18

F l o t a t i o n Conditions for L9

45-

Table No. 38

Product

Weight

Weight

-

Heads Concentrate L10-1

Assay Per Cent % Zn

% Fe

% ?X> % S.S

22.5

20.0

9.7

4.9

40.8

19.22

44.5

9.0

5.2

21.7

L10-1

171.5

81.78

17.6

24.0

11.4

1.1

L10-1

212.3

100.00

22.9

21.3

10.3

5.1

Concentrate L10-2

49.2

22.36

40.9

10.7

5.4

18.9

Tailings Composite

*

Tailings

L10-2

170.8

77.64

18.2

23.8

11.5

1.3

Composite

LIO-2

220.0

100.00

23.3

20.9

10.1

5.2

Concentrate L10-3

26.7

13.26

49.2

6.4

3.4

24.9

Middlings

L10-3

16.4

8.14

26.5

17.4

9.7

8.8

Tailings

L10-3

158.3

78.60

18.8

21.7

10.4

1.2

Composite

L10-3

201.4

100.00

23.5

19.3

9.4

4.9

Concentrate L10-4

22.8

11.32

51.8

5.7

2.6

27.1

Middlings

L10-4

16.3

8.09

33.6

13.6

7.7

14.0

Tailings

L10-4

162.4

30.59

18.7

23.0

10.8

1.2

Composite

L10-4

201.5

100.00

23.6

20.3

9.6

5.1

Assay and " e i g h t Per Cent Leach LIO

-46-

Table No. 39 Distribution % % Fe % Pb

Product % Zn

% S.S

Concenlfrate L10-1

37.27

8.10

9.68

82.26

Tailings

L10-1

62.73

91.90

90.32

17.74

Concentrate L10-2

39.29

11.46

11.91

80.72

Tailings

L10-2

60.71

88.54

88.09

19.28

Concentrate L10-3

27.81

4.39

4.79

66.55

Middlings

L10-3

9.20

7.33

8.39

14.44

Tailings

L10-3

62.99

88.28

86.82

19.01

Concentrate L10-4

24.79

3.18

3.06

59.37

Middlings

L10-4

11.49

5.43

6.47

21.92

Tailings

L10-4

63.72 91.39

90.47

18.71

Distribution Per Cent Leach LIO

-47

turn

Table No. 40

Reagents L10-1 Minerec A

0.66

Minerec 27

Pounds Per Ton L10-2 L10-3R L10-3C —

L10-4R

L10-4C

0.69

0.69

0.64

Sodium F l u r o i d e

0.47

0.46

0.50

Sodium S i l i c a t e

—

—

—

Copper S u l f a t e

0.94

0.91

0.99

Reagent 301

0.0094 0.0091 0.0099

Pine Oil

—

0.52

B a r r e t t No. 4

—

0.22

— -

0.50 4.64

4.64 0.99 0.046

0.0099

0.046

Reagents f a r LIO F l o t a t i o n T e s t s *

Test

Conditioning Time Min.

Table No. 41 Flotation Time Min.

PH

% Solids

L10-1

20

8

5.2

7.58

L1G-2

25

10

5.4

7.86

L10-3R*

25

10

5.4

7.46

L10-3C*

2

5

5.7

—

L10-4R-*

25

7

5.5

7.46

L10-4C*

2

6

5.7

--

F l o t a t i o n Conditions ^Rougher •fcC l e a n e r -48-

f o r LIO

ACKNOWLEDGMENTS The writer wishes to express his appreciation to Associate Research Professor Donald W. McGlashan for his assistance and criticisms during this investigation. Asknowledgment is also given to Dr. J. GedTge Grunenfelder for his helpful suggestions and encouragement and to Mr. C. J. Bartzen for making all assays for this Investigation.

-49-

BIBLIOGRAPHY 1. W. C. Snow, "Electrolytic Zinc at Risdon, Tasmania", A. I. M. E. Transactions, Metallurgy of Lead and Zinc, Vol. 121, p. 482-526. 2.

Mineral Dressing Laboratory Manual, Montana School of Mines, Experiments No. 2 and 10, M.D. 61.

3.

John L. Bray, Non-Ferrous Production Metallurgy, John Wiley*& Sons, Inc., 1947, Second Edition, p. 503-505.

4.

C. C. DeWitt, "Froth Flotation Concentration1*, Industrial and Engineering Chemistry, May 1940, Vol. 32, p. 655.

5.

A. M. Gaudin, Plato Malozemoff, "Hypothesis for the Non Flotation of Sulfide Minerals of Near-colloidal Size", A. I. M. E. Transactions, Milling Methods, 1935,. Vol. 112, p. 304-305.

6.

A. M. Gaudin, Principles of Mineral Dressing, McGrawHill Book Company, Inc., New York and London, 1939, p. 395.

7.

J. E. Garrett, "Flotation of Unclassified Ball Mill Discharge for the Recovery of the Lead and Zinc Concentrates", Australazian Institute of Mining and Metallurgy, Proceedings No. 92, 31st Dec. 1933.

8.

A. F. Taggart, Handbook of Mineral Dressing, John Wiley and Sons, Inc., 1945, SecTion 12.

9.

Norman Weiss, "The Application of Xanthates to Flotation", A. I. M. E. Transactions, Minerals Beneficiation, 1949, Vol. 183, p. 148.

10.

A. M. Gaudin, Flotation, McGraw-Hill Book Company, Inc., New York and London, 1932, p. 101.

-50

This is to certify acceptance of the graduate thesis, and the passing of the oral examination by Chester Freshour on June 5, 1950 in partial fulfillment of the requirements of the Master of Science degree in Mineral Dressing Engineering at the Montana School of Mines.

Examining Committee

-51-