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CONCENTRATION O7 MAGNETITE, .ILMENITEAND ASSOCIATED VANADIUM

FROM BRAZEAU - WOOD DEPOSIT

M. Raicevio, R. Lastra and O.I. Mathieu .Mineral Processing Laboratory

February 1990.

1 3.8-5

Project: ""30.13.99

Cost Recovery

^^JO* NO, l -.50153

.. .^

-MINBRAIi.BCZENCEB.LABORATORZES DIVISION 'REPORT MSL 90-8 (CR)

CONFIDENTIAL

.

RECEIVED

..JAN 17 iS91

MINING LANDS SECTION

20 "ina o-ju^to u.,I.R. CftWET 613 992 9383 P.3

CONCENTRATION OP MAGNETITE, ILMENITE

AND ASSOCIATED VANADIUM

FROM BRAZEAO - WOOD DEPOSIT

. . by . - K. Raieevio, R. Lastra and G.I. Mathieu

INTRODUCTION

t ,

A study was requested by Mr.. Wayne Whymark to con- . centrate the magnetite, ilmenite and associated vanadium values contained in the Brazeau - Wood deposit, near Mattawa, Ontario. The products were to be given to Mr. W. Craigen for extraction of the vanadium metal. .

Mineralogical examination was first conducted to identify the main minerals present in the ore, as well as their liberation size. The sample was then crushed and ground to the necessary fineness tp liberate the iron and titanium values for their eventual recovery by magnetic, electrostatic and gravity .techniques. .. .

SAMPLE PREPARATION, MINERALOQICAL STUDY. AND HEAD ANALYSIS

The sample consisted of three pieces bf rock weighing a total of 2.6 kg. These were crushed to minus l cm from which specimens were selected for mineralogical examination. The objective was to determine the size of the main minerals, namely, magnetite, ilmenite and garnet, and to predict their liberation*

Two polished sections were prepared and the size of the minerals of interest was determined by chord analysis using a Microprobe SEM-IFS image analysis system (SMP^-SEM-IPS). Phase! discrimination for image analysis was done using, backseat ter e'd electron images. This method relates, the.contrast and brightness to phase composition. In black and white images,- the whiter a phase appears, the higher its average atomic number.

For each of the minerals of interest the chord measure ments were added and the percent of the chord relative to the sum was calculated. The percent chord data were sorted into classes of chord length* Figures l to 4 show this correlation and give the cumulative chord percent at different lengths....M. —— - T-I-.-T1 - .1 ' ' ' - ' l " ' * - l l. ,| MMM- , ,. ,, ^ . ' 1——^ fc,.., .

CROSS TABULATION t SUM

e.ee-^—^ ^ ^ 288. 488. 688. 888. 1888 FERETX

Figure l - Cumulative chord percent ( Y-axis) at different chord sizes (X-axis) for ilmenite.

CROSS TABULATION i SUM

288. 488. 688. 888. 1888 FERETX

Figure 2 - Cumulative chord percent (Y-axis) at different chord sizes (X-axis) for magnetite*

MAR 30 '90 09'.57 E.M.R. CflNMET 613 992 9389 P.6

48.8

28.8-'

8.88-^

CROSS TABUIATION l SUM

s s s s x x x

288. 488. 688. 888. 1888 FERETX

Figure 3 - Cumulative chord percent (Y-axis) at different chord

paroor CROSS TABULATION i SU1

8.88288. 488. 1880 FERETX

Figur* 4 - Cumulative chord percent (Y-axis) at different chord sizes (X-axis) for garnet plus silicates.

MAR 33 '90 03:bo fcl.M.R. CAriiILT 613 552 9333 P.7

Kg0 and/or K30 can be used as guides to determine the grind required for liberation of the given mineral. In general, if the ore is ground to 8(^ minus K^ then a liberation of * 501; of the mineral will be obtained, whereas if the ore is ground to 8Crt minus Kj0 then s* 80 to 901 of the mineral will be free. Table l summarizes the values of Kg0 and K30 obtained from Fig. l to 4. An estimate of the relative proportion of the main min erals is also given.

Table l - values of Kg, and K^ .for Ilmenite, Magnetite/Ilmenite Plus Magnetite and Garnet Plus silicates

Mineral

Ilmenite Magnetite Ilmenite plus magnetite Garnet (plus silicates)

Size (/ra)

K 80

656 544 696 600

K 30

200 184 232 156

V Content (approx)

25 '40 65

15 (+20)

In summary, grinding the sample to 80% minus 200 jum (w 65 mesh) will yield a liberation of 80 to 901 of all the minerals of. interest in the sample. . . .

A representative sample from the crushed material was pulverized and analyzed for total iron (Pe), titanium (Ti), vanadium (V), aluminum (Al) and calcium (Ca).

Table 2 - chemical Analysis of Head sample

%Fe

44.2

iTi

8.0

*v

0.48

%A1

3.76

. %Ca

0.48.

MAR 30 '90 09:58 E.M.R. CftNMET 613 993 9389 P.8

CONCENTRATION OF MAGNETITE AMD ILMENITE

Magnetic Separation ' . '

Various approaches were considered to recover the magnetite and ilmenite values. Magnetite is readily concentrated by low-intensity magnetic separation because of its extremely high magnetic susceptibility, i.e. -50,000 x 10"* emu. Con versely, both ilmenite and garnet are paramagnetic with rela tively close magnetic .susceptibilities at ~ 150 x ip"* and 50 x 10"* emu, respectively. Exploratory testwork was never theless done using magnetic separators on a sample .of the minus 397 A"n (48 mesh) fraction obtained from the crushed material. The magnetite was readily recovered by a Sala low-intensity separator, but the ilmenite and garnet had a strong tendency to concentrate together at high intensity, as shown by the results and observations reported in Table 3.

Table 3 - Results of low and high intensity magnetic separation

Separator ,

Low- intensity

Plus : High-gradient (at 0.07T)*

Products

L-I Magnetics

H-I Magnetics

Non-magnetics

Weight 1

40.2

42.2

17.4

Observations

Largely . magnetite

Ilmenite and garnet Silicates

*Lowest setting of the separator.

MAR 30 '90 09:58 E.M.R. CftNMET 613 992 9389 P.9

Low-Intensity Magnetic Separation* Gravity Concentrationi ' -

and sizing of TailingIlmenite has a specific gravity of 4.7 while that of

garnet is in the order of 3.9. Although the difference is rather small, attempts were made to separate the two minerals by tabling after removal of the magnetite by low-intensity magnetic separa tion.

In preparation for this test, the whole sample was stage-ground to minus 210 jim (65 mesh). The material was then passed over a Sala low-intensity separator. The nonmagnetic fraction was subsequently fed to a Deister shaking table. Four distinct bands of material were observed on the table and recov ered using adjustable cutters.

The first band was a relatively rich ilmenite con centrate; the second was a mixed product visually composed of approximately half ilmenite and half garnet; the third band comprised fine ilmenite, some garnet and silicate minerals; the remainder (4th band), which is the table tailing, contained essentially micaceous minerals of more than 73 /*m (200 mesh) and finer ilmenite and silicates. The mixed product (i.e. rougher table concentrate No. 2) was cleaned by re-tabling in an attempt to improve the ilmenite-garnet separation. Limited success was achieved; however, the ilmenite cleaner table concentrate was still contaminated by garnet; conversely, some ilmenite reported in the garnet cleaner table tailing.

A flowsheet illustrating the various steps of the procedure is shown in Fig. 5; the weight distribution of the products, their specific gravity and their content of iron, titanium, vanadium and aluminum content, are also given.

ROUGHERDEISTERTABLE

l

FEED (-2103 jira)

JLow-Intensity

Magnetic SeparationJ

1st band

2nd band

3rd band

CLEANER DEISTER TABLE

4th band

SCREEN (73

Rougher Table Tailing ( +T3 /xm)(Wt 3;: 5.5; SG: 3.14)(12.9% Fe; S.0% Ti; Q.21% V; e.4% Al)

Magnetite concentrate (Wt %: 42.9; SG: 5.0) (65.9t Fe; 1.53t Ti; 1.151 V; 1.0% Al)

Ilmenite Gravity Concentrate No. l ,(Wt %: 10.0; SG: 4.7) (36.2% Fe; 24. tt Ti; Q.54% V; 1.2t Al)

Ilmenite Gravity Concentrate No. 2 •(Wt %: 10.8; SG: 4.4) (31.61 Fe; 15.2% Ti; 0.361 V; 4.5% Al)

Cleaner Table Tailing 1 (Wt %: 2.9; SG: 3.9) ^ (30.51 Fe; e.8% Ti; Q.22% V; 10.2% Al)

Ilmenite Gravity Concentrate No. 3 %: 10.6; SG: 3.65)

Fe; S.6% Ti; D.25% V; S.0% Al)

Rougher Table Tailing (-73 /im)(Wt l: 17.3; SG: 3.95)(26.tt Fe; H.7% Ti; 0.321 V; e.6% Al)

8? 3-m*3Jo

en t-* to

Fig. 5 - Primary Concentration of Magnetite and Ilmenite by Low-Intensity Magnetic Separation, Tabling and Screening

T)f-* Q

MAR 30 '90 09J59 E.M.R. CANMET 613 992 9389 P. li

8 ;

Electrostatic and Hlgh-Qradienfr Magmatic SeparationThe results of the primary concentration indicated

garnet contamination of all the ilmenite concentrates (see aluminum, content),. Conversely, the rougher and cleaner table tailings contained sufficient ilmenite to warrant its recovery. Several products were thus re-treated to either upgrade the ilmenite concentrates or to scavenge ilmenite values. The techniques employed were adapted to the composition of the products: i.e., high tension (electrostatic) separation for the removal of the garnet (insulator) from the ilmenite (conductor), high-gradient magnetic separation to scavenge ilmenite from the ilmenite gravity concentrate No. 3 and from the minus 200 mesh table rougher tailing. The upgrading and scavenging operations are illustrated in Fig. 6 along with the corresponding weights and analyses of the products.

Material ftalaneeaTwo material balances were computed* The first in

cluded all the individual products from the overall treatment. In the second case, the similar concentrates (ilmenite, garnet) and the various tailings were combined for the computation. Both balances are shown in Table 4.

Ilmenite Gravity - Concentrate No. l

Ilmenite Gravity - Concentrate No. 2

Cleaner Table Tailing

High Tension Separation

Ilmenite High TensionConcentrate No. l (Wt l: 9.1; SG: 4.8)(37.7i Fe; 26.41; Ti; Q.58% V; Q.35% Al)

Garnet Concentrate No. l (SG: 3.8) (Wt %J 0.9; 21.4% Fe; Q.77% Ti; Q.10% V; IX.0% Al)

High Tension Separation

gIlmenite High Tension . . V?Concentrate No. 2 (Wt *: 6.5; SG: 4.7) 53(38.81 Fe; 24.6* Ti; 0.53* V; 0.58* Al) n

Garnet Concentrate No. 2 (SG: 3.96)(Wt %: 4.3; 20.7% Fe; D.89% Ti; Q.09% V; 10.51 Al)

73

High Tension Separation

Ilmenite High Tension . HConcentrate Mo. 3 (Wt t* . 0.8; SG: 4.55) P

Fe; 22.U Ti; Q.50% V; 1.25% Al) w

fGarnet Concentrate No. 3 (SG: 3.6)(Wt *: 4.3; 20.7* Fe; 0.89* Ti; 0.9* V; 9.3* Al)

Ilmenite Gravity Concentrate No. 3 —

HGMS Non-Mags No. l (SG: 3.5)

High-GradientMagnetic Separation—————— S ——————

High Tension Separation

T

Ilmenite HGMS fi HTConcentrate No. 4 (Wt K : 2 .0; SG: 4.4)(43.3% Fe; 25.01 Ti; D.64% V; 4.901 Al)

(Wt *: 6.9; 12.2* Fe; Garnet Concentrate No. 4 (SG: 3.26)1.11* Ti; 0.20* V; 9.9* Al) (Wt *: 1.7; 16.8* Fe; 1.15* Ti; 0.20* V; 9.9* Al)

Rougher Table Tailing High-Gradient Magnetic Separation

Ilmenite HGMS Concentrate No. 5(Wt %: 9.3; SG: 4.3)(34.9* Fe; 18.81 Ti; 0.431 V; 3.8U Al) TJ

h-* W

HGMS Non-Mags No. 2 (SG: 3.4)(Wt *: 8.0; 15.8* Fe; 3.5* Ti; 0.20* V; 8.4* Al)

Pig. 6 - Cleaning and Scavenging of 13- ^nite by High Tension (HT) Separation and High-Gradient Magnetic Separation (HGMS)

Table 4 - Results of.magnetite, ilmenite and garnet concentration

I - Material Balance (Individual Products)

Products

A. Magnetite coneB. Ilmenite HT cone #1C. Ilmenite HT cone #2D. Ilmenite HT cone #3E. Ilmenite HGMS fi HT cone i 4F. Ilmenite HGMS cone ft 5G. Garnet cone fiH. Garnet cone #2I. Garnet cone #3J. Garnet cone |4K. HGMS non-mag #1L. HGMS non-mag #2M. Gravity tailing (+200M)

Feed (calod)

Weight%

42.99.16.50.82.09.30.94.32.11.76.98.05.5

100.0

Analysis, \

Fe

65.937.738.837.243.334.921.920.716.316.812.215.812.9

43.2

Ti

1.526.424.622.125.018.80.770.891.041.151.113.53.0

7.68

V

1.150.580.530.500.640.430.100.090.120.200.200.200.21

0.69

Al

1.020.350.581.254.903.81

11.010.59.39.99.59.98.4

3.79

Distribution, t

Pe

65.57.95.80.72.07.50.52,10.80.72.02.91.6

100.0

Ti

8.431.320.82.36.5

22.80.10.50.30.31.03.62.1

100.0

V

71.67.65.00.61.85.80.10.60.40.52.02.31.7

100.0

Al

11.50.81.00.42.69.32.6

11.95.14.4

17.320.912.2

100.0

IX - Material Balance (Combined Products)*

' Products

A. Magnetite coneB, to F. Ilmenite coneG. to J. Garnet coneK. to M* Rejects

Weight%

42.927.79.0

20.4

Analysis, %

Fe

65.937.419.113.8

Ti

1.523.20.962.56

V

1.150.520.120.20

Al

1.021.92

10.169.4

Distribution, %

Fe

65.524.04.06.5

Ti

8.483.71.16.8

V

71.620.91.65.9

Al

11.514.124.150.3

ogm3JO

trih*b)

U) U) W

H O

T)M OJ

MftR 30 '90 10:00 E.M.R. CftNMET 613 992 9389 P.14

11

SUMMARY AND CONCLUSIONS

The Brazeau-Wood deposit sample contained magnetite (- 401) and ilmenite (~ 20%} with associated vanadium values (0.51 V). The iron and titanium oxide minerals were essentially Liberated at minus 210 /jm (65 mesh). Magnetite was readily concentrated by low-intensity magnetic separation. The ilmenite recovery presented more difficulties than expected due to the presence of garnet, both minerals having comparable density and magnetic susceptibility. High tension(electrostatic) separation was used to achieve their final separation. By a combination of gravity, magnetic and high tension separation techniques, most of the magnetite and the ilmenite were recovered in separate con centrates analyzing 65.^ Fe and as.2% Ti, respectively. The vanadium reported largely in these concentrates/ i.e., Tl.6% with the magnetite and 20.9 !fc with the ilmenite* Their respective contents of vanadium were X.15% and Q.52%. The products were given to Mr. W. Craigen for studies on vanadium extraction.

The methods used to recover the ilmenite in our study were not optimized and might not be the best approach for in dustrial production. More material and further investigation would be necessary to develop the most effective and economic flowsheet for the treatment of the Brazeau-Wood ore.

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•40726.4 PROJECT! BRAZEMHOOO PAGE l*4**BF —&IJP ELEMENT 23j3Btt UNITS•3? , - -.f HAS CONC, ' RO CONC i 1 - RO CONC t 3. a CONC i 2! CL TAILS * 2

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Certificate of Analysis

BONDAR-CLEQQ\ DIVISION 01- iNCUCAI'L INSPUCilOS * TESTING SERVICES

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