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Reselection is based on different media stream in minerals, or having different sedimentation velocity method of sorting, including mineral jig (vertical flow), mineral shaker (ramp flow) and a centrifugal concentrator (rotational flow) and Heavy medium beneficiation, that is, ore is sorted in a resuspension.
The density of stibnite is 4.26g/cm 3 , the density of gangue is 2.6 ∼ 2.65g/cm 3 , and the equal drop ratio is 2.19 ∼ 2.26, which belongs to the easy-selected ore sorted by density. Huang Yuhua (5.2g/cm 3 ), red sputum ore (7.5g/cm 3 ), 锑 ( (5.57 g/cm 3 ), and the equivalence ratio to gangue were 2.55 ∼ 2.63, 3.93 ∼ 4.06 and 2.76 ∼ 2.86 These three types of antimony ore are ore that are easily sorted by density. Only the mink calcite density is 3.14 g/cm 3 , and its equi-drop ratio is only 1.29, which is a harder sorting ore.
Re-election costs are generally lower than flotation and can be used as a pre-selection process to remove large amounts of gangue before entering flotation. Due to the difficulty of flotation of yttrium oxide ore, it is still mainly re-election at this stage.
Heavy medium dressing is a new technology for re-election. Guangxi China in 1966 CHANGPO Concentrator, 1975 South tin mine processing plant to achieve the heavy media beneficiation of antimony ore. The dense media, the long slope in Mineral Processing plant for factory production pyrite arsenic, tin Shannan ferrosilicon processing plant, both the process and sorting index are listed in Table 1 and FIGS. I and FIG. II and Table 2.
Figure 1 Flow chart of heavy medium ore dressing in tin mine
Table 1 Heavy medium selection conditions and indicators of Dachang Changpo Plant
Selection condition | Processing capacity | Feeding granularity | Media suspension density | Mine ratio | Pressure on |
30 ∼ 40t·h -1 | -20 ∼ +4mm | 2.3 ∼ 2.6g·cm -3 | 1:2 ∼ 1:4 | 1.18×10 4 ∼ 1.47×10 4 Pa | |
Selection indicator | The ore contains Pb 0.43% ∼ 0.83%, Sb 0.35% Tailings contain Pb 0.044% ∼ 0.119%, Sb 0.039% Recovery rate Pb(Sb)91.15% ∼ 96.4% The waste rock yield is 38.89% for the original ore and 44.94% for the operation. Heavy product contains Pb 0.48% ∼ 1.05% Direct cost of 1.16 yuan per ton of ore (1980) | ||||
Figure 2 Flow chart of heavy medium ore dressing in Dachang Changpo Plant
Table 2 Separation conditions and indicators of heavy medium in tin mine south selection plant
Selection condition | Processing capacity | Feeding granularity | Media suspension density | Mine ratio |
15 ∼ 20 t·h -1 | -35 ∼ +10mm | 2.26 ∼ 2.65 g·cm -3 | 1:1 ∼ 1:1.5 | |
Selection indicator | The ore contains Sb1.58% tailings containing Sb 0.18%, the recovery rate is 95.11% Waste rock yield accounted for 43.3% of operations Heavy products contain Sb2.65%, light products contain Sb0.18% Direct cost per ton of ore is 1.4 yuan (1980) | |||
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