Source and extraction of coal Zhou (a) is one of the products of coal oil extracted from petroleum. The petroleum composition is complex and varies with the place of origin. It can be divided into three categories: paraffinic oil, naphthenic petroleum and aromatic petroleum. The main component of petroleum in Daqing Oilfield of China is alkane compound; the main component of cycloalkane is cycloalkane. The petroleum produced by Yumen in China contains cycloalkane, which is said to be a mixture of alkane and a ring; the Baku oil of the Soviet Union promotes the naphthenic Type, Indonesian oil is aromatic oil.
The petroleum is fractionated, and different boiling point fractions are collected to obtain various petroleum products, and the petroleum can be fractionated into a plurality of products as needed. The general fractionation conditions are shown in Table 1.
Petroleum fractionation products Table 1
Boiling point (°C) | Component | Name | Use |
40～100 100~200 | C 5 H 12 to C 7 H 16 C 6 H 14 to C 12 H 26 | Petroleum ether Steam oil | Solvent Fuel for automobiles, airplanes, and internal combustion engines |
200～275 275-400 The residue | C 13 H 28 to C 15 H 32 C 16 H 34 to C 20 H 42 C 18 H 38 to C 22 H 46 C 20 H 42 to C 24 H 50 | Kerosene, diesel lubricating oil Vaseline Stone wax Levy | Tractor fuel, flotation reagent raw materials, non-polar mineral collectors , Lubricant Medicine, lubricant Mineral processing chemicals Paving road |
China is rich in oil, and it is very suitable to use petroleum as a raw material for mineral processing or to extract kerosene from petroleum as a collector.
(II) Collector performance of molybdenum ore mixture of kerosene and pine oil mixture The molybdenum-like composition and screening results used are listed in Tables 2 and 3. The properties of each fraction of kerosene used are listed in Table 4:
Molybdenite ore composition (3) Table 2
Mineral sample | Grade (%) |
A B | MoS 2 8.18 1.44 | Fe 5.99 5.71 | S 8.89 4.73 | SiO 2 71.41 80.93 | Al 2 O 3 5.84 4.34 |
Screening analysis of mineral samples (3) Table 3
Grain size | Yield (%) |
Mineral sample A | Mineral sample B |
+100 100~150 150~200 200～270 270-400 -400 | 3.56 23.0 7.5 13.1 8.4 12.4 | 0.3 29.1 14.3 25.8 13.2 17.3 |
[next] Physical properties of various fractions of kerosene (3) Table 4
Boiling point range (°C, 1 atm) | Yield % | Specific gravity D 2 4 | The refractive index η. 12 |
- <150 150~180 180~200 200~220 220～235 <235 | 100.00 2.53 13.62 31.70 43.92 1.29 6.95 | 0.789 0.670 0.770 0.871 0.794 0.802 0.809 | 1.4427 1.4300 1.4347 1.4390 1.4451 1.4488 1.4519 |
The flotation was carried out in a 50-gram impeller flotation machine, including bubbling for 5 minutes, pH = 6.4-6.6, and slurry temperature 15.7-17 °C. The flotation results are shown in Figure 1.
It can be seen from Fig. 1 that the recovery rate of molybdenite is difficult to decrease with the increase of the percentage of kerosene in the mixed oil, and the recovery rate of iron decreases significantly with the increase of the percentage of kerosene in the mixed oil, for example, when there is no kerosene. The recovery rates of MoS 2 and Fe were 96.3% and 73.7%, respectively. When the mixed oil contained 95% kerosene, the recovery rates of MoS 2 and Fe were 86.2% and 7.5%, respectively. It is worth noting that when using a mixture with a higher percentage of kerosene, it increased from 30.17% to 62.89%. These results indicate that the selectivity to molybdenite (compared to pyrite) can be effectively improved when the percentage of kerosene is greater than that of pine oil. It is also seen from Fig. 1 that when the kerosene and the pine oil blended oil, the mineral sample A also obtained good flotation results.
(III) Collection efficiency of various fractions of kerosene Figure 2 and Figure 3 show the flotation results of using 1400 g/ton of various fractions of kerosene. Figure 2 shows the fractions with a boiling point of 150-180 °C for the sample A. The kerosene, MoS 2 can get a good recovery rate. However, regardless of the kerosene of that fraction, the rate of return to MoS 2 does not change much. However, the recovery rate of iron gradually increases as the fractionation temperature increases. Figure 3 is the test results obtained for Sample B. The amount of various kerosene added is about 660 g / ton. The volcanic properties of different fractions of kerosene for mineral sample A and mineral sample B cannot be exactly the same, but the kerosene of 200-220 ° C and 220-235 ° C boiling point can get the best. The results are shown in Table 5.
Molybdenite contact angle value Table 5
Drug | Connection angle (Θ°) |
Distillation Primary kerosene 150 ° C fractionated grade kerosene 150~180°C fractionated kerosene 180~220°C fractionated kerosene Higher than 220 ° C fractional grade kerosene | 59.5 60.3 63.1 73.2 76.0 84.5 |
From the contact angle data of Table 5, it is seen that the 180-220 °C fractionated grade kerosene and the fractional grade kerosene above 220 °C form the largest contact angle with molybdenite. The flotation experiment proves that the larger the contact angle of the kerosene fraction in Table 5, the better the flotation efficiency of molybdenum ore.
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