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1) Diesel Generator set ;
We Provide all kinds of diesel generator sets ,the power range from 10kva to 1000kva ,single or three phases ,50/60HZ, .All these diesel generators can work in various environments to satisfy the different demands of different clients from different countries .
2) Specification of the generator:
The basic specifications: 230 / 400V AC, 50Hz / 60Hz, 0.8Pf , three phase four wires
Use: can be used for the open type and the soundproof type , automatic type
3) THE SPECIFICATIONS OF THE ALTERNATOR:
The world first class alternator, up to the GB755, BS5000, VDE0530, IEC34-1, CSA22.2, AS2359 standard, brushless and self-excitation, it be can supply excitation in many cases:
· STAMFORD/ MARATHON/ LEROY SOMER/ QIANGHUI
· Standard pitch winding can be inhibit currents interruption
· Insulation Class: H Protection class: H
· Frequency at stable state: ≤±1.0%
· Telephones interference: THF < 2%, TIF < 50
4) Control system:
a) Automatic alarm system: the unit has the ocus to-optics alarm
system and arrestor for any situation as the start defeat, the water
is over temperature, the oil pulls down, over speed, over load and
over current
b) Operation display:
i) Unit voltage, tri-phase load current and frequency display
ii) Water temperature, oil pressure display
iii) Fuel level, fuel temperature display
iv) Audible and visual alarm lamps and buzzers
5) Supply standard collocation:
a) Diesel engine with all accessories, 3 filter, electric systems
b) Alternator
c) Steel structure
d) Fan and water tank cooling system
e) Flange connector
f) 12 / 24V starting motor and charge engine
In nature, copper mineral known about 170 kinds, but with the industrial application of only a dozen. The average content of copper in the earth's crust is 0.01%. Various copper minerals can be classified into primary copper sulfide ore (such as chalcopyrite), secondary copper sulfide ore (such as chalcopyrite) and copper oxide mineral (such as malachite) depending on their genesis and chemical composition. World copper production is about 7.5 million t/a. There are beds of copper porphyry copper, copper pyrite, copper layer, skarn copper, copper sandstone copper, and copper-nickel sulfide ore vein copper seven categories. Copper iron ore is mainly produced in skarn deposits, and some are produced in volcanic deposits and metamorphic deposits. The copper content of this type of ore is generally medium, but the iron content varies greatly. The highest is more than 50%, and the lower is only 10% to 20%. The ratio of minerals in the ore, in the production of some copper minerals beneficiation plant to the main, some iron-based minerals, iron sulfides are generally used as a secondary product.
The properties of a copper ore ore are relatively simple. The copper mineral is mainly chalcopyrite. In addition, there are a small amount of copper blue and porphyrite. The iron mineral is mainly magnetite, but the magnetite is covered with pyrite and yellow. Copper ore and gangue mineral inclusions. For the nature of ore, the experiment adopts the flotation-magnetic separation combined process, and the copper circuit is selected as the flotation process. The flotation reagents are lime, A 3 and butyl xanthate. The final copper concentrate grade is 20.23%, and the recovery rate is 91.54%. The iron selection circuit adopts the process plan of magnetic separation and iron coarse concentrate regrind. The final iron concentrate grade is 61.54%, and the recovery rate is 78.35%. The good test index is obtained.
First, the nature of the ore
The ore element has a copper content of 0.80%, the main copper mineral is chalcopyrite, and a small amount of copper blue and porphyrite. Chalcopyrite is mainly composed of granular aggregates with large distribution, smooth boundary and easy dissociation. A small amount of chalcopyrite is finely packed in iron oxide minerals such as magnetite and hematite, or it is fine granular and milky. disseminated in sphalerite separation structure constituting a solid solution; iron content of 30.57%, mainly magnetite iron minerals, followed by a maghemite, magnetite artifacts, goethite, lepidocrocite, siderite Etc., the local iron in the ore stone minerals is severely stained.
The results of analysis of multi-element, copper phase and iron phase of ore are shown in Tables 1, 2 and 3.
Table 1 Multi-element analysis results of ore (%)
Element
Quality score
Cu
0.80
Pb
0.18
Zn
0.17
S
1.14
Fe
30.57
Co
0.018
Element
Quality score
Cd
0.002
CaO
20.29
MgO
2.66
SiO 2
28.17
Al 2 O 3
3.77
Burnout
10.23
Table 2 Results of copper phase analysis (%)
Different
Primary copper sulfide
Secondary copper sulfide
Combined copper oxide
Natural copper and free copper
Total copper
Quality score
Occupancy rate
0.58
72.50
0.08
10.00
0.08
10.00
0.06
7.50
0.80
100.0
Table 3 Iron phase analysis results (%)
Different
Sulfide iron
Iron in oxide
Total iron
Quality score
Occupancy rate
1.91
6.25
28.66
93.75
30.57
100.0
The sanding sheet was pressed with a -3mm composite sample. It can be seen under the microscope that the pyrite inlaid has a fine grain size, -74μm accounts for 85.5%, and a small amount of chalcopyrite is finely packed in magnetite, hematite, etc. In the iron oxide mineral, it is in the form of fine particles, and the droplets are embedded in the sphalerite to form a solid solution separation structure. Therefore, it will have certain influence on the recovery of copper; the magnetite is mainly distributed in the range of 0.15 to 0.013 mm. The coarser, monomer dissociation is easier, but the magnetite is often wrapped with pyrite, chalcopyrite and gangue mineral inclusions. At the same time, the gangue minerals in the ore are heavily iron-dyed, which will inevitably affect the recovery of iron.
Second, the test results and discussion
According to the nature and characteristics of the ore, after the exploration and experiment, the flotation-magnetic separation combined process was finally determined, that is, the copper mineral was first floated and the iron mineral was magnetically selected. After the flotation circuit grinds the ore to 70%-74μm, the copper concentrate is obtained by one rough selection, one sweep, and two selections. The flotation agent has slurry adjuster lime, and the foaming agent A 3 and butyl are collected. Yellow medicine. The magnetic separation iron circuit uses the flotation copper tailings as the ore supply of the iron selection circuit, and the iron coarse concentrate is further ground to 92%-74 μm, and then a selected iron ore is obtained.
(1) Copper flotation test
1. Exploratory experiment
The ore copper mineral is relatively simple in nature, mainly chalcopyrite, but secondary copper oxide and combined copper oxide each account for 10%. Compared with the original copper minerals, these copper minerals not only have a large difference in floatability, but also seriously affect the floatability of copper sulfide minerals. For example, secondary copper sulfide is prone to copper ions and activates iron sulfide minerals. It is difficult to control during flotation and is more likely to cause fluctuations in beneficiation index. Combined with copper oxide, it is not easy to recycle.
In view of the above problems, the exploration test determines the grinding fineness and the adjusting agent. The fineness of the ore grinding is 70%-74μm, and the amount of adjusting agent lime is 2000g/t, which is mainly for the copper foaming foaming agent. Detailed experimental study. The test results are shown in Table 4.
Table 4 Test results of copper flotation collector (%)
Collector type
product name
Yield
grade
Recovery rate
Butyl xanthate + pine oil
Copper concentrate
Copper tailings
Raw ore
8.56
91.44
100.0
8.76
0.08
0.82
91.45
8.55
100.0
Butyl xanthate + ester-105
Copper concentrate
Copper tailings
Raw ore
6.71
93.29
100.0
10.64
0.10
0.81
88.44
11.56
100.0
Butyl xanthate + pine oil
Copper concentrate
Copper tailings
Raw ore
6.77
93.23
100.0
11.07
0.09
0.83
89.93
10.07
100.0
Butyl xanthate + Z-200
Copper concentrate
Copper tailings
Raw ore
5.56
94.44
100.0
11.93
0.18
0.83
79.60
20.40
100.0
Butyl xanthate + A 3
Copper concentrate
Copper tailings
Raw ore
8.35
91.65
100.0
9.30
0.06
0.83
93.39
6.61
100.0
It can be seen from Table 4 that the butyl xanthate combined with the novel trapping foaming agent A 3 has a good effect on improving the recovery rate of copper. And A 3 is an environmentally friendly agent, which is convenient to use and low in price.
2. Test of grinding fineness
The useful minerals in copper-iron ore have fine particle size, and some secondary copper sulfide often forms a coating on the surface of iron sulfide minerals, even in the form of solid solution, which is difficult to dissociate. Therefore, the fineness of grinding is not enough, which is often the reason for the low recovery rate of copper flotation in many concentrators. The test rate to the test ore sample copper mineral inlay particle size is fine, here to investigate the effect of grinding fineness on copper ore content and recovery rate. The test principle process and test results are shown in Figure 1 and Figure 2.
Fig.1 Test procedure and conditions for fine grinding of copper rough grinding
Figure 2 Results of copper coarse grinding grinding fineness test
1-copper grade; 2-copper recovery
It can be seen from Fig. 2 that as the fineness of grinding increases, the grade of copper minerals gradually decreases, and the recovery of copper is 92.79% when the fineness of grinding is 70%-74μm, and then with the fineness The increase in the recovery rate is not obvious. Therefore, considering the overall process layout and the cost of ore dressing, the fineness of the flotation grinding is determined to be 70%-74μm.
(2) Ferromagnetic selection test
The tailings of the copper flotation test were used as the ore for the ferromagnetic separation test, and the entire magnetic separation circuit was composed of one rough selection and one selection. The final rough magnetic field strength was determined to be 95.49 kA/m and the selected magnetic field strength was 55.70 kA/m.
Due to the presence of pyrite and chalcopyrite in the magnetite, the inclusion of the gangue minerals is not good enough for the iron concentrate to be purified. Therefore, before the selection, the first It is regrind. The results of the regrind test are shown in Figure 3.
Fig. 3 Results of regrind test of iron coarse concentrate
1-iron grade; 2-iron recovery
It can be seen from Fig. 3 that as the regrind fineness increases, the grade of iron concentrate decreases in turn, but the recovery rate of iron concentrate increases in turn. Taking into account the selection indicators and production costs, the final refinement of iron concentrate is 92%-74μm.
(3) Closed circuit test
The closed-circuit test of the copper-iron ore is carried out under the optimal process flow and conditions determined by the condition test. The closed-circuit test process and conditions are shown in Fig. 4, and the test results are shown in Table 5.
Figure 4 Closed-circuit test process and conditions
Table 5 Closed-circuit test results (%)
product name
Yield
Grade
Recovery rate
Cu
Fe
S
Cu
Fe
S
Copper concentrate
Iron concentrate
Tailings
Raw ore
3.61
40.38
56.01
100.0
20.23
0.09
0.06
0.80
34.87
61.54
9.93
30.57
22.97
0.12
0.49
1.14
91.54
4.30
4.16
100.0
4.12
78.35
17.53
100.0
72.89
4.10
23.01
100.0
Third, the conclusion
(1) The test adopts a flotation-magnetic separation joint process, which is simple and easy to implement on site.
(2) In the copper selection circuit, considering the influence of secondary copper sulfide and combined copper oxide on the flotation circuit, butyl xanthate is used together with the new trapping foaming agent A 3 as a collector for copper minerals. Effectively improve the recovery of copper minerals. The final copper concentrate grade reached 20.23% and the recovery rate was 91.54%.
(3) In the iron selection circuit, due to the presence of inclusions in the iron minerals in the ore sample, in order to improve the grade of the iron concentrate, the iron coarse concentrate is reground and good experimental indexes have been obtained. The final iron concentrate grade was 61.54% and the recovery rate was 78.35%.