6781097176
F. Durao etat. / The European Journal of Minerał Processing and Environmental Protection Vol.4, No.3, 1303-0868, 2004, pp. 272-281
Non floated product
FeA Grade (%)
Figurę 7. Washability and grade- recovery curves - flotation of V type clay
In what concerns Z type clay, the results obtained (Table 7) showed that it is jx>ssible to reduce significantly the iron grade by using froth flotation.
Table 7
Best results of bench tests - Z type clay
|
Wt (%) |
|
|
Assays (%) |
|
|
|
|
Distribution (%) |
|
|
|
SiO, |
Al,0, |
K,0 |
Na,0 |
Fe;0, |
Ti02 |
SiO, |
Al,0, |
K,0 |
Na>0 |
Fe,0, |
TiO, |
Feed |
100.0 |
65.45 |
18.63 |
1.26 |
0.17 |
5.31 |
1.35 |
100.0 |
100.0 |
100.0 |
100.0 |
100.0 |
100.0 |
OFh' |
62.3 |
54.85 |
26.24 |
1.66 |
0.23 |
5.22 |
1.37 |
52.20 |
87.73 |
81.77 |
82.77 |
61.20 |
63.09 |
UFh1 |
37.7 |
82.98 |
6.06 |
0.61 |
0.08 |
5.47 |
1.32 |
47.80 |
12.27 |
18.23 |
17.23 |
38.80 |
36.91 |
OFh' |
53.1 |
51.70 |
28.44 |
1.74 |
0.24 |
5.25 |
1.34 |
41.94 |
81.06 |
73.1 1 |
75.18 |
52.50 |
52.67 |
UF„2 |
9.2 |
73.00 |
13.51 |
1.19 |
0.14 |
5.02 |
1.53 |
10.26 |
6.67 |
8.66 |
7.60 |
8.70 |
10.42 |
OF,1 |
3.9 |
69.50 |
7.77 |
0.53 |
0.18 |
10.82 |
5.99 |
4.14 |
1.63 |
1.64 |
4.14 |
7.95 |
17.29 |
OF,' |
2.8 |
73.30 |
7.47 |
0.48 |
0.10 |
1 1.06 |
3.26 |
3.14 |
1.12 |
1.06 |
1.65 |
5.83 |
6.76 |
OF,1 |
2.6 |
78.50 |
6.60 |
0.45 |
0.09 |
9.05 |
1.77 |
3.12 |
0.92 |
0.93 |
1.38 |
4.43 |
3.41 |
UF,
Processed |
28.4 |
86.20 |
5.64 |
0.65 |
0.06 |
3.85 |
0.45 |
37.40 |
8.60 |
14.61 |
10.05 |
20.59 |
9.46 |
Clay
(OFh'+ UF,) |
81.5 |
63.72 |
20.49 |
1.36 |
0.18 |
4.76 |
1.03 |
79.34 |
89.66 |
87.71 |
85.23 |
73.09 |
62.13 |
As it can be seen in Fig. 8, the iron and titanium minerals have much faster responses to flotation than V tyf>e clay. It was possible to recover by flotation almost 30% of the clay with an FezOs grade around 3.85% (Fig. 9).
Time (min)
Figurę 8. Kinetic curve - Z type clay
279
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