In view of the beneficiation characteristics of molybdenum , in the main ore-producing molybdenum ore dressing practice, the process is often divided into two sections: rough selection section, “rough grinding-rough selection”; selected section, “multi-stage re-grinding-multiple selection”.
"Roughing - rough selection": It is well known that the energy consumption of a ball mill is related to the new surface area of ​​the grinding product. As the product fineness increases, the required energy consumption will also increase, and the ball mill processing capacity will decrease. Conversely, as the fineness decreases, the energy consumption will also decrease and the ball mill processing capacity will increase. When Claymax studied the molybdenum ore with a Bondability Index of 10 to 13, the relationship between the fineness of the grinding and the processing capacity of the ball mill is shown in the figure below. Similar results were found in domestic small-scale trials or industrial (test) studies.
Obviously, "rough grinding" is very economical. However, whether the "rough grinding" can be implemented in production is still the key to meeting the needs of "rough selection." That is to say, the large number of connected organisms produced by "rough grinding", especially the poor and continuous organisms can rise.
The table below lists the relationship between grinding fineness and mill handling capacity.
Figure Grinding fineness and ball mill processing capacity
Table grinding fineness and mill processing capacity
Selection plant
Grinding fineness (%-200 mesh)
Increased processing capacity (%)
Remarks
Before the test
After the test
Variety
JINDUICHENG small processing plant
Luanchuan Molybdenum Mine
Yang Jiazhangzi
71~77
62.35
58
55.76
-13~19
-6.59
-8~10
16.5
20 or so
12~15
Industrial Research, 1983
Industrial Research, 1983
test
Due to the natural floatability characteristic of molybdenite, even if the lean body is as thick as 0.6mm, as long as the surface is exposed with 1% molybdenite, it will float smoothly, that is to say, "rough grinding" under certain conditions. At the time, the "rough selection" of molybdenum ore is feasible. The application of hydrocarbon oil, Xintex, Aofang MCO and other chemicals can make the coarse grinding particle size of molybdenum ore more coarse.
“Multi-stage re-grinding - multiple selections”: The coarse concentrate containing a large number of continuums produced by “rough grinding-roughing” is selected as a molybdenum concentrate with a “rich ore ratio” of up to 500. It needs to be reground to make it fully dissociated and selected several times.
In the United States, Claymax has a coarse concentrate size of about 80%-65 mesh produced by "rough grinding-roughing", and 80%-20μm molybdenum concentrate containing more than 90% of MoS 2 is selected by re-grinding. Grinding to such a fine, the selected section has three sections of re-grinding.
In order to obtain the superior grade molybdenum concentrate, Jinduicheng No. 1 Plant has set up two sections of re-grinding in the selected section, and the second section re-grinded the product to a fineness of 80%-500 mesh.
Although it is finely ground in order to dissociate the molybdenum ore into sufficient monomer, since the regrind material is not the whole of the ore, it is only a coarse concentrate which accounts for a very small part of the ore, "rough grinding - rough selection" and "multi-stage re- Grinding - multiple selections, while achieving high quality, high recovery molybdenum concentrates, while saving energy. This process has become the general process for the main production of molybdenum ore.
Another important source of molybdenum, the copper -molybdenum mine, is recovered as a by-product. Its production is usually divided into two sections: copper-molybdenum mixed flotation and copper-molybdenum separation.

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