(1) Using a reasonable grinding system to improve technical and economic indicators 1. Determination of the best grinding fineness
Shaanxi Province metallurgical scientific research institute, other impurities from the viewpoint of suppression of molybdenite flotation studied fineness the best grinding problems. Different minerals, the best floatable particle size is different, they try to find a flotation molybdenite from this gap, and suppress the optimal particle size range of sulfide impurities.
The molybdenum ore is produced in different places, the flotation conditions are different, and the optimal floatable particle size is also different. The on-site process inspection of the second plant of Jinduicheng Molybdenum Co., Ltd. in October 2008; the on-site process of the Yangjiazhangzi Mining Bureau Molybdenum Plant in October of October; the investigation of the site process of the Luanchuan Molybdenum in the past eight years The fractional recovery of molybdenite (see the figure below) is very different.
They used the three selected concentrates of the Jinduicheng Second-selection plant, the coarse concentrate of the Luanchuan molybdenum ore, and the coarse concentrate of the Taiping molybdenum ore, and respectively selected the molybdenum molybdenum suppression test under different fineness to determine The best sorting fineness.
The three ore mines in Jinduicheng were re-grinded (time change), and 33 g/ton NaCN was used as a non-molybdenum sulfide impurity inhibitor in the eight open-circuit selections of the same conditions. The test results, the fineness of molybdenite ore pyrite may affect the buoyancy of the two figures are below.
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In order to study pyrite, they used sulfur fine sand (FeS2 purity >85%) to make different fineness floatability tests under the conditions of molybdenum selection. The results are shown in the figure below. When using Nokes to suppress Pb, the lead inhibition rate varies with flotation time under different inclusion fineness (see the figure below).
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It is not difficult to see from the above five figures: molybdenum ore is very buoyant, and the best floatable particle size is finer, preferably 5-40μ or 96.8%-36μ. The fineness increases or decreases the mooring molybdenum floatability.
Pyrite has the best floatability at 60-70%-36μ, and this fineness is consistent with the fine grinding refinement of the site. That is to say: the selection process after the general re-grinding at the site is carried out when the pyrite is most difficult to be inhibited; when the fineness is reduced or increased, the iron recovery rate and the iron grade are significantly reduced. There was no longer an inflection point in which the recovery rate increased in the fineness range of the test. That is to say, under the condition of re-grinding of the three concentrates, the floatability of the pyrite decreases, which is exactly the opposite of the fineness of the molybdenite.
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When the galena is coarse (d>30μ), it is enriched in molybdenum concentrate (rich ore ratio >1); the ratio of rich ore is 50-60μ and back-
The yields were all significantly decreased, and the decrease was particularly significant after d<30μ.
In the selection operation after re-grinding of the three concentrates in Jinduicheng, the molybdenum ore can float upward as the fineness of the selected fines rises, and the floatability of sulfide impurities (such as pyrite and galena) decreases. Just the opposite. Especially between 96.8% and 36μ, the difference is the largest. With this fineness, only 5 g / ton of NaCN was selected, and only a section of regrind was obtained. The fineness of 60%-36μ was selected as the best sorting fineness of molybdenum.
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