At present, the hand selection is still the main means for the rough selection of China's black tungsten ore. The black tungsten ore crushing operation generally adopts a three-stage one-closed crushing process, the coarse crushing adopts a rotary or jaw crusher , the medium crushing adopts a standard cone crusher, and the fine crushing adopts a short-head cone crusher . After the raw ore is coarsely crushed, it is demineralized by washing and sieving. According to the requirements of hand selection, the ore is divided into three grades or four grades for backhand selection. The fine mud is concentrated and treated, and the qualified mine after the backhand selection is crushed and then enters the re-election operation.
Based on tungsten ore dressing "early harvest overcharged, and more lost as early as lost" principle, so as soon as possible wolframite recovery after dissociation, it is an important measure to improve the tungsten mineral recovery. Part of the black tungsten ore is selected from the tungsten and Fulian bodies separately in the hand-selection operation, and directly enters the selection operation, which avoids the muddy loss of the high-grade tungsten in the process of crushing, grinding, re-election and belt transportation. , achieved "early harvest and overcharge" and improved tungsten recovery rate. In the rough selection process of the Pangushan tungsten ore mine shown in Figure 1, these several process technologies are combined to improve the tungsten recovery rate and reduce the loss of tungsten in the rough selection section.
Figure 1 Process flow chart of rough selection section of Pangushan tungsten ore
The production technology, production actuality and current situation of the Dajishan tungsten ore combined concentrating plant changed the single four-level backhand selection of the original rough selection process to the first-level forehand selection of four-stage counter-hand selection, and improved the +60mm backhand selection belt. Two hand selection methods are performed on the same belt. Add pre-disposal waste at the front end of the belt, discard the waste rock and large block of +60mm by manual pre-selection, reduce the thickness of the belt ore layer, and make the ore can be laid on the belt to the maximum extent, eliminating the phenomenon that the ore blocks and cascades on the belt. , backhand selection at the back end of the belt. The opponent chooses tungsten for “early harvest and overchargeâ€, and hand-selected tungsten is sent directly to the selection workshop to increase the tungsten recovery rate. By increasing washing screening operations fully recovered ore transport belt during a secondary collision difficult hand-picked high-grade ore fines generated, reducing fine tungsten metals in waste rock in the loss.
The Shuangpingshan Concentrator of Dangping Tungsten Mine changed the previously unselected fine-grained grade to the moving sieve jig and the backhand to select a coarse sweeping process, and used the moving sieve jig to select and recover the granular tungsten. And Fulian students, to achieve "early income and income", reduce the strength of hand selection, reduce metal loss.
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