Cnc Turning is namely Lathe machining, Lathe machining is a portion of mechanical processing.
Lathe machining is always a process that turning tools doing turning machining to a rotary workpiece. On CNC lathes, the operators or the engineers also can use drills, reamers, screw taps, threading dies and knurling tools to make relative machining work. CNC Turning is usually applied to machining shafts, plates, bushings and all other workpieces which have rotary surfaces, it is a very widely application in practical mechanical manufacturing.
CNC turning can be divided into rough turning and finish turning, rough turning is for the purpose of machining with big cutting depth and big feed rate, to improve the machining efficiency. However, the precision of rough turning can only be grade IT11, the surface finish can only be Ra 20-10um. On the contrary, semi-finish machining and finish machining usually can only apply high speed but small feeding rate and cutting depth. In this condition, the machining accuracy can be up to grade IT10-7, the roughness can be Ra10-0.6um.
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Mine existing 1100t / d processing amount beneficiation plants, divided into two series. A series of 500t / d processing capacity, using 1 rough selection, 3 sweeps, 10 selected processes; two series scale 600t / d, using 1 rough selection, 4 sweeps, 10 fine Selected process.
The main problem is the presence of the above-mentioned process: â‘ molybdenum metal recovery rate is low, only 40.00% - 50.00%; â‘¡ low grade molybdenum concentrate, molybdenum concentrate grade of only 15.00% ~ 20.00%, the lowest reach of molybdenum concentrate National quality standards.
In March 2006, the mine cooperated with China University of Mining and Technology to conduct a semi-industrial split test of -20μm fine-grain flotation column by column sorting process, followed by a grain-level semi-industrial split test and a selective split test. Satisfactory test results were obtained; in August 2007, the plant installed 3 industrial flotation columns, and the system was stable after commissioning tests.
The fine mud part is divided into a part of the floating ore mine for hydrocyclone classification, and the -20μm fraction is entered into the column sorting system. After 1 rough selection and 2 times selection, the concentrate product and tailings are obtained; the whole grain fraction The selection is directly from the inlet of the ore flotation into the column sorting system for sorting; the selected part is directly introduced into the flotation machine rough selection concentrate to obtain the final molybdenum concentrate product through three times.
The fine mud and full grain sorting process is shown in Figure 1, and the selected process is shown in Figure 2. 
The results of semi-industrial split test of fine mud are shown in Table 1. The results of full-scale semi-industrial split test are shown in Table 2, and the results of selected split test are shown in Table 3.
Table 1 Semi-industrial split test results of fine-grained ore %
It can be seen from Table 1 that for the sorting of fine-grained molybdenum ore, the column sorting has obvious advantages over the flotation machine process, the concentrate grade is increased by 8.82 percentage points, and the recovery rate is increased by 12.13 percentage points. Since most of the high oxidation portion of the ore is present in the fine fraction, it is effective to classify the fine fraction by column sorting.
Table 2 Results of full-grain grade ore stability test %
It can be seen from Table 2 that, in the classification of full-grained molybdenum ore, compared with the fine-grained grade, the column-type sorting concentrate has little change, but the tailings are slightly higher. The main reason is that the ore particle size becomes coarser and the part that is not completely dissociated increases; however, the sorting result of the flotation machine process is better than that under the same conditions. In the case of equivalent feedability, the concentrate grade of the column sorting is improved. 11.78 percentage points, the recovery rate increased by 7.14 percentage points.
It can be seen from Table 3 that, compared with the results of the 10 selections of the flotation machine, under the same feeding conditions, the two-stage selection of the column sorting is better. The concentrate grade can be increased to 38.52%, which is 20.02% higher than the flotation machine, and the selected recovery rate is increased by 21.09%.
The semi-industrial split test results of the oxidized ore molybdenum ore show that the column sorting has a more efficient sorting efficiency for the high oxidation rate molybdenum ore than the ordinary flotation machine process. Due to the high degree of oxidation of ore, it is difficult to increase the concentrate grade to more than 40.00% under the existing pharmaceutical system conditions, and the recovery rate is difficult to increase to more than 65.00%.
Henan mine molybdenum ore is a strong skarn serpentinized molybdenite ore, molybdenite ore chlorite, strong brown iron oxide-depleted ore mineralization. The useful components are mainly molybdenum ore with high degree of oxidation. The mineral inlays are mainly composed of fine particles. Among the gangue minerals, there are many muddy minerals such as chlorite, serpentine and talc . A large number of primary and secondary slimes affect the recovery of molybdenum, so the molybdenum mine is extremely difficult to select molybdenum ore at home and abroad.
Figure 1 Fine mud / full-grain split flow test procedure
Figure 2 Flotation column selective flow test procedure
Shift
Flotation column
Flotation machine
Raw ore
Concentrate
Tailings
Recovery rate
Raw ore
Concentrate
Tailings
Recovery rate
1
2
3
4
average
0.169
0.198
0.180
0.210
0.189
27.40
29.60
27.45
28.38
29.21
0.070
0.082
0.078
0.083
0.078
58.73
58.75
56.83
60.65
58.74
0.186
0.195
0.217
0.204
0.201
22.17
18.58
18.83
17.96
19.39
0.09
0.121
0.117
0.102
0.108
51.82
37.95
46.37
50.29
46.61
Shift
Flotation column
Flotation machine
Raw ore
Concentrate
Tailings
Recovery rate
Raw ore
Concentrate
Tailings
Recovery rate
1
2
3
4
5
average
0.195
0.184
0.197
0.195
0.191
0.192
29.49
26.47
31.89
30.71
30.54
29.82
0.102
0.063
0.093
0.097
0.100
0.091
47.86
65.92
52.95
50.41
47.80
52.77
0.186
0.212
0.194
0.190
0.188
0.194
19.67
17.85
18.11
16.38
18.20
18.04
0.108
0.111
0.0984
0.108
0.104
0.106
42.17
47.94
49.55
43.16
44.94
45.63
Table 3 Selected flotation test results of flotation column
Shift
Rough
Flotation column
Flotation machine
Concentrate
Fine tail
Recovery rate
Concentrate
Fine tail
Recovery rate
1
2
3
average
1.73
2.03
1.86
1.87
38.74
37.52
39.29
38.52
0.235
0.284
0.319
0.279
86.94
86.67
83.53
85.70
19.89
17.35
19.26
18.50
0.798
0.672
0.653
0.708
56.25
69.59
67.17
64.61