(Iv) boiling fraction with kerosene hydrocarbon in n-collecting capability of molybdenite than kerosene collector ability
PBM Yangjiazhangzi results demonstrate beneficiation plant Wuchang Nujol oil production (the weight wax) COLLECTING of molybdenite kerosene than conventionally used, and to test the production Fujitsu proved using heavy wax as collector, than the existing recovery of kerosene to improve the roughing 1-2%, to improve the overall recovery of more than 1%, and can reduce the amount of pine oil 10 g / t, but the increase of the buoyant pyrite, The amount of sodium cyanide must be slightly increased. The heavy wax used is derived from kerosene having a boiling range of 180 to 310 ° C. The main component of the kerosene of the distillation range is a warm mixture of alkanes, naphthenes and aromatic hydrocarbons. The heavy wax is 90% or more of the normal paraffins taken out by the action of urea and the kerosene. The components are listed in Table 6. The results of the small flotation test are shown in Table 7.
Heavy wax composition analysis Table 6
Carbon chain length | Below C 12 alkane | C 13 alkane | C 14 alkane | C 15 alkane | C 16 alkane | C 17 alkane | C 18 alkane | C 19 alkane | C 20 alkane |
Sample 1 (%) | Trace | 8.73 | 19.27 | 22.20 | 21.35 | 15.87 | - | 3.7 | Trace |
Sample 2 | 2.96 | 9.61 | 18.81 | 21.61 | 20.38 | 16.27 | 7.93 | 2.47 | - |
Flotation molybdenum ore small test indicators Table 7
Mineral sample | Dosage amount (g / ton) | Rough concentrate Grade MO (%) | Rough selection Recovery rate(%) | Recovery rate High range (%) | |
Kerosene | Heavy wax | ||||
Mineral sample I (original grade M 0 0.11%) | 160 | 160 | 3.63 3.48 | 93.10 94.22 | 1.12 |
Mineral sample II (original grade M 0 0.11%) | 155 | 155 | 5.28 5.36 | 84.52 85.85 | 1.33 |
From the figures listed in Tables 6 and 7, it can be concluded that n-alkanes have a higher ability to capture molybdenite than kerosene in the test boiling range.
(5) Effect of viscosity of hydrocarbon oil on molybdenum recovery capacity (8)
The molybdenum grade used in the test contained 0.35% MoS 2 , and after crushing, the particle size distribution of the ore particles is listed in Table 8.
Particle size distribution after grinding 8 Table 8
Particle size | weight(%) | Total weight (%) |
42 60 80 115 170 250 325 -325 (sand) -325 (mud) | 12.8 9.3 12.2 11.2 14.6 5.1 6.6 13.8 14.8 | 12.8 22.1 34.3 45.5 60.1 65.2 71.8 85.2 100.0 |
In the test room, the ore-feeding of the particle size of Table 8 was carried out by a 100 g mechanical agitation flotation machine, and under the same conditions, the hydrocarbon oil of different viscosity was used as a collector, and the result of one rough selection was obtained. Listed in Figure 4, Figure 5, Figure 6.
The hydrocarbon oil collectors used in Figures 4, 5, and 6 are arranged in increasing viscosity, starting from kerosene to unhydrogenated hot cracked light diesel oil. This group is called low viscosity oil, from P-911 to 100. /100L▽I white oil, this group is called high viscosity oil: 90/210 white oil and 150/210H▽I varnish are very high viscosity oils, their viscosity is 435.0 and 590CST at 38 ° C, respectively, due to their The viscosity is too large, so it is diluted with other oils to make it roughly similar in viscosity to high viscosity oils. [next]
The hydrocarbon oil collectors used in Figures 4, 5, and 6 are arranged in increasing viscosity, starting from kerosene to unhydrogenated hot cracked light diesel oil. This group is called low viscosity oil, from P-911 to 100. /100L▽I white oil, this group is called high viscosity oil: 90/210 white oil and 150/210H▽I varnish are very high viscosity oils, their viscosity is 435.0 and 590CST at 38 ° C, respectively, due to their The viscosity is too large, so it is diluted with other oils to make it roughly similar in viscosity to high viscosity oils. [next]
Figure 4 shows the relationship between the viscosity of the hydrocarbon oil and the recovery of molybdenum, and the low viscosity oil of the forest is changed to high viscosity oil flotation.
Figure 4 Relationship between molybdenite recovery and oil collector viscosity [8]
Figure 5 Relationship between molybdenite recovery and oil collector viscosity [8]
In general, the recovery rate is increased by about 2%, and the very high viscosity oil is mixed with other oils in a 1:1 ratio, and the recovery rate is higher and the effect is particularly good. For example, 50:50 light furnace oil and 150/210Hâ–½I varnish have the best mixed effect, and kerosene and 0-17 are not normal.
Figure 5 shows the results of flotation of molybdenum ore with five oils. The harvesting dose is doubled (160 g/ton) and the recovery rate is increased, indicating that the dosage of 80 g/ton is insufficient. It is worth noting that the viscosity of the oil has an effect on the recovery rate, which is greater at a dosage of 160 g/ton than when the weight is 80 g/ton.
The data in Figure 6 shows the relationship between the viscosity of the hydrocarbon oil collector and the grade of molybdenum concentrate. It can be seen from the figure that the low viscosity oil from kerosene to unhydrogenated hot cracked light diesel oil has a molybdenum concentrate grade of 12 ~16%. However, from high viscosity oils to two mixed oils, the grade of molybdenum concentrate is reduced to 8 to 11.6% MoS 2 .
In general, low-viscosity oil is used as molybdenite collector, and the obtained concentrate grade is low in molybdenum ore; high-viscosity oil is used as collector of Huiwai ore, and the rate is decoded, and the grade of concentrate is refined. low. If the specified recovery rate can be achieved, it is more suitable to use a low viscosity oil as a molybdenite collector.
Why is the high-viscosity oil used as a molybdenum collector, and the recovery rate will be higher? Because the viscosity of the oil (if the oil molecules are normal and heterogeneous) reflect the size of the oil molecules, the viscosity of the oil is large, the oil is strong, and the hydrophobic properties are strong. On the one hand, the fine mud-like molybdenite particles are selected. Flocculation, flocculation of these fine molybdenite particles, which are more easily adsorbed on the bubbles than individual fine-grained molybdenite particles. On the other hand, a large viscosity oil has a large trapping ability, and can capture a large body of molybdenite and molybdenite. Therefore, the use of a highly viscous oil as a collector has a high recovery rate.
From the point of view of the nature and yield of the foam, the same is true. The oil with low viscosity is used as the collector of molybdenite. The foam color is light and dry, and the yield is low, so the grade is high. The oil with high viscosity is used as the molybdenite. The color of the foam is deep and wet, and the yield is large, so the recovery rate is high and the grade is low.
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