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Kerosene (3)
(6) Hydrocarbon oils contain suitable surface active substances to improve their collection performance.
1. The influence of surface active substances on the contact angle of molybdenite in hydrocarbon oils. The more surface active substances and unsaturated hydrocarbons in hydrocarbon oils, the hydrophilic surface with molybdenum ore particles (vertical cleavage plane) The better the effect, because the molybdenum ions are exposed in the straight cleavage plane, and the double bond adsorption of surface active substances and unsaturated hydrocarbons increases the hydrophobicity of the molybdenum ore particles.
Effect hydrocarbon composition as Ottawa capture agent on a hydrophobic surface 4 molybdenite      Table 9
Collector name
Surface tension on the boundary line with water (dyne/cm)
Iodine value
Acid value
Plane wetting contact angle
Cleavage plane
Transformer oil
Coal oil
Motor oil (V type)
45
30
29
8.70
11.23
11.97
0.63
0.82
1.65
50
45
50
60
65
78
The data in Table 9 shows the effect of the composition of certain oil collectors on the surface hydrophobicity of molybdenite.
It can be seen from the data in Table 9 that the increase of iodine value indicates that the degree of unsaturation in the oil increases; the acid value increases, indicating that the acid content in the oil increases; the contact angle of the vertical cleavage surface increases with the iodine value and acid value of the oil. And increase, and the contact angle of the cleavage surface does not change with the increase of the iodine value and the acid value of the oil. It can be seen that the acidic surface active substance of the unsaturated hydrocarbon adsorbs on the vertical cleavage surface, thereby increasing the vertical solution. The hydrophobicity of the surface increases the contact angle.
2, the impact of emulsifier 3 kerosene is difficult to dissolve in water, so if emulsified kerosene, its flotation effect will be strengthened. Table 9 lists the results of the collector flotation using the mineral sample of Table 2 and the mixture of kerosene and pine oil of Table 4. From the data in Table 9, although it is difficult to draw conclusions about the flotation efficiency of various granulating agents, the general trend of these emulsifier flotation effects can be summarized. For example, when there is no emulsifier, the grade of the foam product is MoS 2 39.24% Fe 9.5%, and the recovery rates are 88.3% and 29.4% respectively; on the contrary, when the emulsifier is used, the recovery rates of MoS 2 and Fe are both high. In particular, fatty alcohol sulfate fatty acid polydiethanol ester, alkylphenol polydiethanol ether, is effective in increasing the recovery rate of MoS 2 . Adding an anionic emulsifier (â… in Table 9, â…¡, â…¢) flotation result, the foam quality of MoS 2 products than using a separate mixed oil floatation foam product of low grade MoS 2; but using nonionic emulsifying The agent (IV, V, VI in Table 9), the grade is slightly higher or slightly higher than when the mixed oil is used alone; the substance is Noigen EA80 (the main component is from alkylphenol polydiethanol ether) foam product The grade of MoS 2 is 45.44%, which is obviously improved. In general, after adding a milk additive, the grade of Fe becomes high. [next]
In production practice, kerosene often causes the foam to rupture, but the addition of emulsifiers can improve this condition.
(7) Mixing kerosene with copper ion (CU 2+ ) and anion collector
It has been proved that copper ions can be adsorbed onto the surface of molybdenum ore, so that the surface of the diamond core is positively charged and then floated with an anionic collector. The test of a molybdenum plant proves that the use of oil-based collectors and anionic collectors is better than oil-based collectors alone. According to the literature, the radioisotope Cu 64 is used to study the adsorption of copper ions on the surface of molybdenite. It is proved that copper ions have an activation effect on molybdenite, and at pH=7, the adsorption amount of copper ions is the highest. Molybdenum ore is activated by copper sulfate and then recovered by diesel and black medicine. The recovery rate of molybdenum ore is slightly improved. The test results are listed in Table 10:
Skarn type molybdenum ore sorting results (6) Table 10
Test number
Dosage amount (g / ton)
Molybdenum concentrate index (%)
Diesel
Pine oil
Copper sulfate
Black medicine
Yield
Mo grade
Recovery rate
1
2
3
120
120
120
40
20
20
100
200
46.5
46.5
1.75
1.62
1.54
2.40
2.74
2.87
83.03
87.22
87.53
Table 10 shows that copper sulfate, black medicine and kerosene are used together, the recovery rate of molybdenum concentrate is increased by 4.5%, and the grade is increased by 0.47%. The mechanism of action of anion collectors and molybdenite is generally considered to have the following:
1 The molybdenum ore vertical cleavage surface exposes molybdenum ions, and some molybdenite crystal lattice damage also exposes molybdenum ions, so that the anion collector can be adsorbed;
2 Molybdenum ore is partially oxidized in the deposit and during mining, storage, transportation and crushing, so molybdenum oxide can interact with the anion collector;
â‘¢ molybdenite and chalcopyrite, chalcocite, pyrite with the living body can be received with anionic capture agent to act;
â‘£ molybdenite itself contains some heavy metal sulfides. Therefore, copper sulfate, black medicine and diesel oil are used in combination, and flotation molybdenite has good results.