Environmental Engineering Reference
In-Depth Information
Table 19.2.
Mineralogy and chemistry of some fine grained tailings.
Chemistry (% by weight of dried tailings)
pH tailings
LOI
(1)
Tailings
Mineralogy
S
i
O
2
Al
2
O
2
Fe
2
O
3
CaO
MgO
Na
2
OK
2
O
water
Weipa 1
Gibbsite (45%), boehmite (18%), kaolin (12%), quartz (17%),
19
52
6
0.1
0.1
0.1
0.1
18
6.9
hematite (5%)
Weipa 2
Gibbsite (34%), boehmite (35%), kaolin (10%), quartz (8%)
10
53
12
0.1
0.1
0.1
0.1
19
6.4
Na and Ca montmorillonite, kaolin, coal, quartz
(2)
Wambo
28
12
1
0.9
1.0
0.8
0.4
51
6.8
Illite, Ca montmorillonite, kaolin, quartz
(2)
Riverside
29
13
0.5
0.1
0.3
0.3
0.7
54
7.4
Mt Newman Hematite (40%), kaolinitic shale (50%), quartz (6%)
(2)
17
12
63
0.4
0.7
0.1
0.4
5
7.4
Hematite (34%), kaolinitic shales (52%), limonite (8%), goethite (19%)
(2)
Hamersley
20
14
60
0.1
0.3
0.1
0.1
7
7.1
Quartz, kaolin, gibbsite
(2)
, host rock, dolerite, basalt, sulphide and
North
55
14
13
2.3
1.1
2.8
2.2
7
7.9
Kalgurli
oxide ores
Broken Hill
Quartz (50%), rhodenite (20%), calcite (12%), garnet (6%),
56
7
12
6.7
1.1
1.1
1.3
1
7.7
manganhedbergite (4%), pyrrhotite (4%)
Notes:
(1)
Loss on ignition (LOI) at 1000°C;
(2)
mineralogy percentages are approximate and vary with production sources.
Table 19.3.
Soil mechanics properties of some fine grained tailings.
Atterberg limits (%)
Particle size (%)
(1)
Water
Dry density
Soil particle
(t/m
3
)
density (t/m
3
)
Clay
(2)
Tailings
content (%)
% solids
Liquid limit
Plastic limit
Plasticity index
Sand
Silt
Weipa 1
675
0.14
13
2.75
44
27
17
20
47
33
Weipa 2
362
0.25
22
2.85
43
26
17
15
45
40
Wambo
411
0.22
20
1.86
74
28
46
14
36
50
Riverside
250
0.32
29
1.74
44
28
16
16
50
34
Newman
192
0.46
34
3.70
33
22
11
20
60
20
Hamersley
169
0.50
37
3.50
30
21
9
5
55
40
North Kalgurli
71
0.94
59
2.81
28
21
7
Not available
Broken Hill
462
0.20
18
3.05
Non plastic
Notes:
(1)
Particle size with dispersant added as per AS1289;
(2)
percentage finer than 0.002 mm.
Copyright © 2005 Taylor & Francis Group plc, London, UK
