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Zhejiang Dongfeng Fluorite Company Concentrator
The plant designed in 1969 by the Institute of Design Shan steel. The design scale is 500t/d.
(1) ore properties: the genus deposit, deposit epithermal silicate fluorite type, occurs in substantially the Jurassic Mesozoic, the Cretaceous volcanic rocks, the multiple lithology tuff (rhyolitic) . The ore is generally in the form of a block, a strip, a breccia, or a honeycomb. Medium and fine grain structure, granular granite morphological structure and plaque-like structure. The massive fluorite is a collection of self-shaped and semi-automorphic grains closely embedded. The single crystal particle size is 0.3-2.5 mm, which is mainly cubic, followed by octahedron and rhombohedral dodecahedron, sometimes represented by quartz . malcrystalline; mostly quartz agglomerate, banded, an aggregate of crystal grains of 0.1 ~ 0.4mm; in addition, feldspar, calcite, clay and a small amount of sericite, chlorite and minor amounts of pyrite ore, magnetite ore and brass.
Fluorite is mainly dense, partially granulated, and closely symbiotic with quartz. The particle size is extremely uneven. The fineness is only 0.01~0.02mm, embedded in quartz vein, generally 0.05~0.6mm, large reachable number. From millimeters to tens of millimeters. The gangue minerals are mainly quartz, which are in the form of metasomatism and filling. The former is divided into cryptocrystalline according to the different granularity of the granules. The particle size is less than 0.005mm, and the granules are mostly in the form of cryptocrystalline particles, and the content is about 50%. The multi-element analysis of ore is shown in Table 1.
Table 1 Multi-element analysis of raw ore
element
CaF 2
SiO 2
CaO
MgO
MnO
Al 2 O 3
S
Ni
Be
Fe
content,%
45.58
49.08
0.49
0.02
0.09
1.05
0.045
0.002
<0.001
0.081
The ore-rich ore contains an average of 50% or more of CaF 2 , and the average ore content of CaN 2 is 30% to 50%. The ore density is 2.86 g/cm 3 , the water content is 2%, the rest angle is 38°, and the Platt hardness is 4.
(2) Process flow: The whole mine consists of more than ten mines in three mining areas (Yangjia, Zhouling, Huajie) (Yangjia, Jiangmadong, Chen Dakeng, Linglong, Huajie, Zhouling, Xulin, Wu Tail dragon, cold water pit, etc.).
Beneficiation two parts, in order to meet the production requirements of metallurgical steel grade fluorspar, each selected from the mining chamber provided artificial hand, hand-selected sub-chamber chunks, blocks, small hand-selected, ore through the grate and vibrating sieving It is more than 200mm, 200~30mm, 30~15mm and 15~0mm, and is manually transported to the large, medium and small hand-selected rooms for manual hand selection, selecting fluorite concentrate and lean ore, concentrate Small electric motor vehicles are transported to the concentrate warehouse and then exported by car. The lean ore is hoisted to the yard or transported by car to the concentrator. The quality of each hand-selected grade of fluorite concentrate was determined according to the specific requirements of the users at that time. The CaF 2 content is generally required to be 80% or more. The hand selection process is shown in Figure 1.
Figure 1 Hand-selection process of Dongfeng Fluorite Concentrator
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The ore dressing plant is located in Yangjia Mining Area. It is a multi-mine point centralized concentrating plant. Since it was completed and put into production in 1971, it has undergone many transformations. In 1986, the ore dressing was three production series. The general characteristics of the process are stage grinding and stage. The selection, but the three series have their own characteristics. The first and second series are after the grinding of the original ore. After coarse grinding, the concentrate is re-grinded, and after six selections, the selected mines are returned to the previous operation in sequence. The sorting process is shown in Figure 2. The crushing and sieving equipment is shared with the three series. The three series selection process is basically the same as the first and second series, but it is more flexible than the first and second series. The refinement of the selected mine can be returned in sequence and re-selected. It can also be returned and re-selected. The mine circuit can be carried out as needed. At the same time, the neutral or weak acid slurry flotation was adopted and the new agent H 1101 was used ; the automatic control was realized in a section of the grinding circuit, and the selection process is shown in Fig. 3. The production process indicators are shown in Table 2. The unit consumption is shown in Table 3. The main equipment is shown in Table 4.
Figure 2 Process of the first and second series of Dongfeng Fluorite Concentrator
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Figure 3 Three series process of Dongfeng Fluorite Concentrator
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Table 2 mineral processing technology indicators
project
in 1980
1981
1982
1983
1984
1985
1986
Raw ore grade CaF 2 ,%
53.89
48.57
47.57
46.20
48.73
45.79
45.35
Concentrate grade
%
Theory: CaF 2
SiO 2
Actual: CaF 2
SiO 2
98.00
0.90
98.41
0.84
97.88
0.96
98.10
0.81
97.87
0.92
98.12
0.82
97.73
0.76
98.12
0.76
98.20
98.16
98.21
0.78
Recovery rate
%
theory
actual
73.57
70.74
81.23
74.99
79.80
74.47
74.20
72.67
74.65
71.05
79.09
Concentrate yield
%
theory
actual
40.29
38.74
40.31
37.13
38.79
36.10
35.08
34.22
37.04
33.14
36.52
Mineral processing ratio
theory
actual
2.48
2.58
2.48
2.69
2.58
2.77
2.85
2.92
2.70
3.02
2.74
Mill unit production
t/(m 3 ·h)
1.59
1.49
1.50
1.51
Mill operating rate, %
76.0
Table 3 Unit consumption index (according to the original mine)
name
Electricity
Steel ball
Oleic acid
soda ash
Water glass
unit
kW·h/t
Kg/t
Kg/t
Kg/t
Kg/t
Quantity
47~55
1.7~2.5
0.66~0.83
1.21~1.41
0.55~0.65
Table 4 main equipment
Serial number
Equipment name and specifications
unit
Quantity
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
PEF600×900 jaw crusher
PYB900 cone crusher
PYD1200 cone crusher
SZZ: 1500×3000 self-centering vibrating screen
MQG2100×2200 wet lattice ball mill
MLG2100×2200 wet lattice ball mill
FLG1500 high-grade single spiral classifier
150150 swirling fine sieve
250250 hydraulic cyclone
0.40.4m 2 plane fine screen (four joints)
XJK-0.62 flotation machine
XJK-1.1 flotation machine
XJK-2.8 flotation machine
TNZ-12m center drive concentrator
1818m peripheral drive concentrator
25m 2 inner filter cylinder filter
34m 2 disc vacuum filter
15001500×12000 cylinder dryer
station
station
station
station
station
station
station
station
station
station
groove
groove
groove
station
station
station
station
station
1
1
1
1
3
2
3
1
1
1
20
60
twenty four
2
1
1
1
2