Hydrocarbon oil collector

November 07, 2019

Hydrocarbon oils can be classified into aliphatic hydrocarbons, alicyclic hydrocarbons and aromatic hydrocarbons. Their characteristics are that the hydrocarbon atoms in the molecule are formed by covalent bonding, which are hardly soluble in water and cannot be ionized into ions. Therefore, it is also called non-polar collector .
Hydrocarbon oil collectors extracted from petroleum , mainly aliphatic cyclic hydrocarbons and small amounts of aromatic hydrocarbons; mainly aromatic hydrocarbons extracted from various tars, which also contain small amounts of acidic and basic organic substances.
Collectors commonly used as hydrocarbon oil is kerosene, transformer oil, sun oil, and tar.
Hydrocarbon oils have very low chemical activity and therefore generally do not chemically change with the mineral surface. Why does the oil droplets adsorb to the mineral surface? Because in addition to the surface that is completely hydrophilic (contact angle is equal to zero), it has a certain lipophilicity. The stronger the hydrophobicity of the mineral surface, the greater the lipophilicity. The process of flotation of hydrocarbon oil on the mineral surface is as follows. Figure 1 shows:

First, the oil droplets adhere to the surface of the mineral such as a. If the oleophilicity of the mineral is large, the oil droplets unfold to the mineral surface, such as b; gradually forming a thin oil layer as shown in c, the mineral surface becomes a hydrophobic oil film.
For mineral surfaces that are not too lipophilic, due to the merger between oil droplets, individual oil droplets and discontinuous oil clusters can be formed. As shown in Figure 1, d, the ore particles also have a certain hydrophobicity, and the mineral surface is hydrophobic. After the oil film, it is easy to adsorb on the bubbles. As shown by e, the bubbles are very light and carry the particles up.
The use of hydrocarbon oil collectors is mainly used for floatation of molybdenum ore, coal, graphite , sulfur, talc, etc., which are non-polar and naturally hydrophobic.
When hydrocarbon oil is used as a collector, the performance of the collector is related to the chemical structure. Taking flotation molybdenite as an example, the flotation effect is listed in Tables 1, 2 and 3: [next]

Pharmacy name
Dosage (g / ton)
Molybdenum grade (%)
Recovery rate(%)
phenol
benzene
Xylene
Cresol
68
122
56
54
1.78
2.72
1.44
1.71
21.21
21.29
24.60
25.11

Naphthalene flotation molybdenum ore results (1) Table 2

Collector name
Dosage (g / ton)
Foaming agent name and dosage (g/ton)
Molybdenum grade (%)
Recovery rate(%)
kerosene
Naphthalene
Naphthalene
Naphthalene
150
50
200
400
Pine oil 20
-
-
-
6.08
6.51
5.43
4.58
72.35
37.05
35.03
43.35
Tricyclic aromatic hydrocarbon flotation molybdenum ore results (1) Table 3
Kerosene (g / ton)
Tricyclic aromatic hydrocarbons (g / ton)
Pine oil (%)
Molybdenum grade (%)
Recovery rate(%)
150
100
-
-
-
-
50
100
150
200
30
30
50
85
100
3.49
5.56
3.57
3.01
3.96
83.20
84.67
84.86
86.26
87.13
It can be seen from Table 1 that the monocyclic aromatic hydrocarbons such as benzene and toluene have low ability to capture molybdenite: as shown in Table 2, naphthalene (bicyclic aromatic hydrocarbon) has enhanced hydrophobicity due to molecular weight, and has molybdenum ore. Strong ability to capture, but the ability to capture is weaker than kerosene; as can be seen from Table 3, tricyclic aromatic hydrocarbons have a strong ability to capture molybdenite, which is comparable to or better than kerosene. According to another report 2, it is also considered that the aromatic hydrocarbons with large molecular weight have good flotation effect on molybdenite, and the high-viscosity naphthenes are large. Therefore, in the residue of refined kerosene, a certain amount of molecules are contained. Hydrocarbons are well suited as collectors for molybdenite.

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