Geological Engineering
144
Table 2.
Results of magnetic separation to obtain magnetic fraction.
Notes,
Reducer
Terms of Experience
Reducing agent
from initial slag,%
Duration of
thermogravimetry settling
Mineral reduction
duration
1
2
3
4
Angren coal
25
40
60
«same»
25.
40
80
«»
25
40
100
«»
25
40
120
«»
25
60
60
«»
25
60
80
«»
25
60
100
«»
25
60
120
«»
25
60
180
«»
25
60
240
«»
25
60
240
«»
25
60
120
«»
25
40
60
«»
25
60
80
«»
25
60
100
Notes,
Reducer
Receiving
Output max., gr.
Magnet. Part
Nemagnite part
gr
%
gr
%
Angren coal
59
6
10,16
52,3
88,64
«same»
54
7,5
13,88
46
85,18
«»
48
9
18,75
39
81125
«»
46
13
28,26
32,5
70,6
«»
45
7
15,5
36
80
«»
50
13
26
37
74
«»
40
15
37,5
25
62,5
«»
50
12
24
27
54
«»
45
15
33,3
30
66,6
«»
55
16
29,0
29
52,7
«»
56
18
32.14
38
67,86
«»
68
13
9,09
55
80,88
«»
55
5,0
9,09
50
90,9
«»
56
11
19,6
45
80,35
«»
50
12
24,0
38
76,0
Geological Engineering
145
«»
45
14
31,1
31
68,8
«»
45
16
34.78
29
64,4
«»
43
19
44.18
22
51,16
CONCLUSION.
Based on the materials stated in the articles, it is possible to draw the
following main conclusions:
1. The floatation and electrothermal methods of the impoverishment of slags now allow
to receive good copper extraction indicators but do not meet the requirements of complex raw
materials. New technologies, though, provide a decrease in the content of copper in slags to
0.1%, and receiving metal iron did not become widespread because of difficulties at the division
of copper and iron. However, they also resolve the complex processing of slags as the silicate
rest can be used for
2. Development of an easy and cheap way of a preliminary obezmezhivaniye is necessary
for the complex processing of cupriferous slags.
4. Previously grown poor slags have to be exposed to complex processing with the
extraction of the iron and the silicate rest suitable for further production of construction
materials. At the same time, the extent of restoration of iron and capacity of correction of the
structure of the slag silicate rest is greater. The cost of the received materials is higher.
There are two options of restoration of reverse slags:
- direct high-temperature restoration in a liquid or firm look;
- low-temperature restoration in tubular furnaces with the subsequent division and
divisions of processing of products of repair.
5. the method of laboratory testing of low-temperature restoration of slags in laboratory
furnaces is developed and established that the optimum temperature of restoration of 1000 °C,
and the slag which is previously granulated in limy milk is restored quicker and more intensely
than not granulated slag or the slag granulated in water. Check is carried out for a fraction of slag
of identical fineness. It is connected with the fact that slag after granulation in limy milk has
considerable porosity and cracks that provide carbon protoxide penetration more deeply into
grains.
6. Products of restoration are exposed to a doizmelcheniye and magnetic separation. The
iron concentrate was received with the maintenance of 90-95% of Fe metal, suitable for
processing in steel-smelting furnaces. The fine particles which stiffened are recommended for
preliminary briquetting. The slag silicate rest can be used for the production of building
materials.
7. For specific conditions of AMMC, the most rational technological scheme is
preliminary impoverishment by term gravitation, granulation in limy milk, restoration, magnetic
separation of the received product, and melting on the metal of iron powder.
References
[1]
Ore fields of Uzbekistan. Group of authors. - Tashkent: GIDROIN GEO. the 2001-611th.
[2]
MalyshevaT.Ya., Dolitskaya O.A. Petrography and mineralogy of iron ore raw materials. –
М: MISIS, 2016 - 424 pages.
[3]
G. Corby, Anderson, C. Robert. Dunne. Mineral progressing and Extractive Metallurgy:
100 years of Innovation Feb.18.2014. – 386 p.
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