Molybdenum ore dressing plant design

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Yangjiazhangzi is located in Liaoning Province. The factory was built in 1940. After the liberation reconstruction processing plant, 1953, a change, expansion, increase the amount of processing molybdenum concentrate production in 1960 reached the highest record. Since then, due to the decline in the grade of ore and the reduction of ore reserves, the amount of treatment has decreased in recent years, and its production technical indicators are listed in Table 1.
Table 1 Yangjiazhangzi production technical indicators
year
Scale, t
Raw ore grade
%
Concentrate grade
%
Tailings grade
%
Recovery rate
%
Annual processing of raw ore
Annual production of molybdenum concentrate
1960
3190019
9210
0.163
45.06
0.0336
79.65
1970
2314245
4969
0.113
45.47
0.0155
86.31
1980
1756708
2909
0.0876
46.01
0.0115
86.96
1984
0.0836
45.70
-
87.07

The ore processed by the plant is mainly from two mining areas, namely the Lingqian Mine and the Songbei Mine. It is 2 km and 7.2 km away from the factory.

The Lingqian Mine is a hydrothermal metasomatic large skarn molybdenum deposit. The molybdenum ore is embedded in the ore in a dip-like or star-like shape. The crystal form is better, the particle size is 0.42 to 0.08 mm, and the molybdenum grade is 0.15% to 0.08%. In addition to molybdenum, there are small amounts of pyrite, yellow copper ore, sphalerite and galena. Non-metallic minerals sub garnet stone, through Hui, calcite and quartz-based. The ore has a Platt hardness of 15. Surrounding rock is mainly limestone and shale, is easy to dressing stone.

The Songbei Mine is a high-temperature hydrothermal fluid that has been repeatedly replaced, with molybdenum deposits dominated by granite porphyry and limestone. Metal minerals are similar to Lingqian mines except for more pyrite. Non-metallic minerals are mainly feldspar , quartz, calcite and kaolin . The molybdenum ore is embedded in the ore in a thin aggregate, with a particle size of 0.15 to 0.02 mm and a molybdenum grade of 0.12% to 0.06%. Mine Danpu Shi hardness of 10, a density of 2.9 g / cm 3, is selected from the quarry difficult.

In 1978, a new molybdenum deposit was found in Lanjiagou, northeast of the 13-kilometer mining plant, containing 0.15% molybdenum. It is a quartz vein containing molybdenum and is present in the fault fracture zone. It will serve as a succession mine for the Yangjiazhangzi Concentrator.

Molybdenum mineral phase analysis and multi-element analysis are listed in Tables 2 and 3, respectively.

Table 2 Analysis of molybdenum mineral phase, %
ore
Molybdenum oxide
Molybdenum disulfide
All mo
Oxidation rate
Before the ridge
0.0015
0.15
0.1515
1.0
Songbei
0.0042
0.0958
0.10
4.2

The crushing process: using three sections and one closed circuit. The coarse crushing is carried out at the mouth of the pit, and then transported to the concentrating plant by the aerial ropeway, respectively, medium and finely crushed, and finally the crushed product particles are less than 12 mm. The main crushing equipment is as follows:

Coarse crush: Lingqian mine: 900mm side discharge ore crusher .

Songbei Mine: one 1500×1200 mm jaw crusher.

Table 3 Multi-element analysis of raw ore, %
ore
SiO 2
CaO
Al 2 O 3
Fe
MgO
CaSO 4 Na 2 sO 4
TiO 2
Before the ridge
33.66
31.37
10.08
5.8
3.3
2.6
1.5
Songbei
40.24
22.05
10.93
7.42
3.52
5.14
1.0
ore
Mn
Mo
S
P 2 O 5
Zn
As
Bi
Before the ridge
0.64
0.19
0.25
0.08
0.075
0.01
<0.01
Songbei
1.08
0.095
0.30
0.07
0.27
0.01
<0.01

Medium crush: two 2100 mm standard cone crushers .

Finely divided: four 2100 mm short-head cone crushers.

Screening machine: 1800 × 3600 mm self-centering vibrating screen eight.

Beneficiation process: According to the difference between the two ore properties of Lingqian and Songbei, the two ores are used for coarse grinding and rough selection, and then the crude concentrate is combined and processed. Fine grinding overflow fineness: 58% of the ore before the ridge is less than 0.074 mm, and 60% of the Songbei ore is less than 0.074 mm. After a coarse and two sweeping tailings, the two systems of coarse concentrate merge into the regrinder, and the grinding fineness is 80% less than 0.074 mm. After eight selections and seven sweeps, the final molybdenum concentrate, molybdenum mine and another tailings were obtained. The molybdenum concentrate foam with a concentration of 35% enters the φ8000×2500 mm concentrator, and the bottom of the concentrator with a concentration of 60% is filtered through a filter, the filter cake contains 15% water, and finally dried to a concentrate containing 4% water. The whole process is shown in Figure 1.

Figure 1 Yangjiazhangzi beneficiation process

Main equipment for mineral processing:

Ball mill : three sets of φ3000×1670 mm cone ball mill

One φ3200×4200 mm lattice ball mill

Four sets of φ3200×3100 mm lattice ball mill

Re-grinding machine: one φ1200×1200 mm lattice ball mill

Flotation machine: 176 sets of XJK-2.8 flotation machine

22 sets of XJK-1.1 flotation machine

XJK-0.35 flotation machine 1

Thickener: φ800×2500 mm 1 set

Φ3600 mm 1 set

Filter: φ5 m 2 1 set

Φ6.5 m 2 1 set

Dryer: 1 set of φ1.0×9.0 meter long barrel dryer

Pharmacy type and point of addition

Grinding: addition of oil (or mixture with an aromatic hydrocarbon) coal, pine oil, sodium silicate.

Rough selection: Select the addition of xanthate.

Sweep and add kerosene and pine oil

Selected sections: Water glass is added to Fine 1, Fine 3, Fine 5, Fine 7 and Fine Sweep 1 .

Pine oil was added to the fine 1, the middle sweep 1 and the middle sweep 3.

Cyanide is added to Jing 5 and Jing 7.

Diphosphorus pentasulfide is added to the fine 7.

Pharmacy:

Total dosage: 120g/ton of kerosene, 10g/ton of xanthate, 110g/ton of pine oil.

Water glass 3400 g / ton, sodium cyanide 7 g / ton, phosphorus pentasulfide 0.9 g / ton.

The main raw material consumption of mineral processing is listed in Table 4.

Table 4 Consumption of main raw materials from 1960 to 1985
project
unit
1960
1970
in 1980
1983
1984
1985
Yellow medicine
g/t
5.4
-
9.1
7.6
10
8
Kerosene (aromatic hydrocarbon)
g/t
167.0
201
105.0
110.0
119
130
Pine oil
g/t
84
119
101
92
86
83
Steel ball
Kg/t
-
0.855
0.89
0.89
0.88
0.89
Power consumption
kWh/t
twenty four
25.82
28.54
31.33
32.61
31.0
The production plant has a long history of production, and in addition to the results, a lot of research work has been carried out in the selection of molybdenum agents , and experience and economic effects have been achieved. This included the first use of a small amount of polar collector xanthate. Prior to 1972, the mine had been using kerosene as a collector. Afterwards, use "heavy wax" as a collector. The heavy wax is a liquid paraffin mainly composed of normal paraffins, and has a freezing point of 6 to 8 °C. Production has proven to be higher than kerosene for coarse-grained molybdenum. The total recovery rate increased by 1%. However, it has a high freezing point and is inconvenient to use in winter. In recent years, aromatic hydrocarbons have been used as collectors. The aromatic hydrocarbon is a cyclic unsaturated aromatic hydrocarbon obtained by catalytically cracking light diesel oil by dimethyl sulfoxide extraction. It is hydrophobic and has a certain foaming power. The flotation effect is equivalent to that of heavy wax. Because of the lower freezing point, aromatic hydrocarbons are currently used as collectors, or aromatic hydrocarbons are mixed with kerosene. In order to improve the quality of grinding products, Yang Mine adopts measures of adding water glass as grinding aid in grinding, improving the non-mine concentration of the mill and the overflow concentration of the classifier, and making the grinding product uniform in particle size, especially reducing coarse particles. The proportion of the grade, which improves the crude recovery. Industrial tests have shown that the mill discharge concentration increases 3% for Songbei Mine and 2% for Lingling Mine. The crude recovery rate increased by 4% to 5% for Songbei Mine and 2.98% for Lingling Mine. To suppress the lead content of molybdenum concentrate, using mine reaction products of phosphorus pentasulfide and sodium hydroxide suppression lead, better results than the use of the original weight of chromium, potassium, especially an inhibitory effect on fine particles of galena more apparent, to ensure that the The lead content of molybdenum concentrate is below the standard. It also inhibits pyrite.

Hydraulic Decoiler
The uncoiler is a special equipment for metal plate leveling. It is used for leveling steel plates and uneven plates. It can be used to form unwinding, leveling, shearing production lines and other plate product production lines according to relevant configurations.
The uncoiler is one of the most important equipments in the welded pipe production line. Its function is to support the steel coil by tightening the inner hole of the steel coil; the other is to send the steel belt head by the rotation of the straight machine. Into the leveler.

The uncoiler spindle has two functions, one is to drive the coil to rotate; the other is the tension support of the coil. The realization of the tension is usually accomplished by pushing the inclined block with the cylinder or cylinder mounted with the spindle. The small unit uses more cylinders and the large unit uses more cylinders. The realization of rotation is usually achieved by the motor rotating the spindle through the reducer. of.

suitable material

Colored Steel plate, galvanized board 

Width of the plate

≤1000-1250mm

Size 

3600*1700*2100mm

Power

 

5.5+4kw

Bearing

 

5-10T

Inner diameter

 

500-508mm

 

speed 

 

10~15m/min

Weight

 

About3.6T

Voltage

 

380V  50Hz

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