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A. The floatability of manganese minerals
Manganese-containing minerals divided into two categories: one is an oxide; the other is a carbonate. The floatability of important manganese minerals is as follows:
Manganese ore MnCO 3 , containing Mn 47.8 %, is a mineral that is more easily floated in manganese ore. Collectors are commonly used in fatty acids, of which oleic acid works best. The most suitable pH for flotation is 8~90 medium regulator commonly used sodium carbonate. Water glass can be used to inhibit quartz gangue, but the alkalinity is too high or the amount of water glass is too large, which has an inhibitory effect on rhodochrosite.
Pyrolusite MnO 2 , containing Mn 63.2, is less difficult to float than rhodochrosite, and fatty acid for collectors during flotation. The pH adjuster is sodium carbonate. Gangue inhibitor water glass. Dextrin and citric acid are inhibitors of manganese oxide ore. Oxalic acid activates it. The test proves that in the flotation of manganese oxide ore, it is collected by oleic acid. Under the condition of pH 6.5, the manganese ore and the manganite are relatively easy to float, while the soft manganese ore and hard manganese ore are the most difficult to float. Only when tartaric acid and water glass are used to disperse the slime can a satisfactory result be obtained. When there is mud, the flotation effect is poor. Desliming the ore, such as removing 10μm of slime, can improve the flotation index.
B manganese ore flotation method
The collectors used in the flotation of manganese ore are oleic acid, tal oil and oxidized paraffin soap. Additionally, hydrocarbon oils may also be used (such as heavy oil, coal oil) was added an emulsifier (e.g., hydrocarbon sulfate esters, etc.) flotation. However, the amount of hydrocarbon oil is very large, ranging from a few kilograms to a dozen kilograms per ton of ore. After the addition of the slurry, it takes a long time of strong agitation to first emulsify the agent. The polar collector is fixed on the mineral surface and then coated. The upper layer of oil film, when the manganese ore flocculates into a mass, and floats together with a large number of fine bubbles. This is the "emulsified flotation".
Ore flotation optimum pH range of 7 to 90 to adjust the slurry, and dispersion suppressing gangue slimes, often with a small amount of sodium carbonate and sodium silicate, tannin and phosphate, but not excessive, the excess manganese ore was inhibitory effect. SO 2 and other reducing agents have an activation effect on manganese minerals. When flotation of manganese oxide ore, the adverse effects of water are significant.
Flotation of manganese ore with Tal oil in two cases: If the gangue in the manganese ore is a carbonate such as calcite , the dextrin is first used to inhibit manganese ore in the alkaline medium, flotation of calcite, and then in the acid slurry, using the tower The oil is used as a collector to float manganese ore; if the gangue is quartz, etc., the manganese ore can be floated directly in the acidic slurry.
The test proves that when tar oil and fuel are used as collectors and emulsified with emulsifier, the re-selected tailings with manganese content of 16.296 are treated in the slurry of pH 4~5, and the obtained concentrate grade contains Mn36.6%. The recovery rate was 90.1%.
When the manganese ore contains sulfide ore, it first floats the sulfide ore and then floats the manganese ore.
A process of ore Manganese ore, the metallic minerals rhodochrosite, rhodochrosite, calcium, manganese, calcite and pyrite. The gangue minerals are quartz, stone pulp and carbonaceous clay. The rhodochrosite is a fine aggregate and a dense block. The calcium rhodochrosite has a layered structure, and the manganese calcite appears as an aggregate or fine vein. The monomer separation of manganese minerals is generally below 0.02 mm.
The flotation of manganese ore is carried out in the flotation column. The flow is shown in Figure 1. After the ore mill is ground to 85%-0.074mm, it is de-sludged with a cyclone, and the carbonaceous gangue is floated with pine oil (200g/t), and the pyrite (400g/t) is added to the flotation of pyrite. One sweep (addition of dibutyl xanthate 200g / t), a selection (addition of butyl xanthate 250g / t, pine oil 100g / t), to obtain sulfur concentrate. The sulfur-selected tailings and carbon rough selection are combined, and the butyl sulphate 250g/t is added to select the carbonaceous gangue to float the carbon. The tailings are adjusted to pH 8.5 with sodium carbonate, and water glass is added. 300 g/t), oxidized paraffin soap (150 g/t), subjected to manganese sweeping to obtain a portion of the grade III manganese concentrate. Sulfur sweeping tailings, adding sodium carbonate (250g / t) to adjust the pH to 8.2, adding water glass (800g / t), oxidized paraffin soap (300g / t), for rough selection, coarse selection of concentrate for secondary selection, I, II, III manganese concentrate. The tailings contain Mn 9.4%, and the ore contains 21.52% Mn. The resulting indicators are as follows: [next]
Manganese concentrate grade | Concentrate grade % | Recovery rate% |
I II III | 35.02 29.34 26.11 | 46.61 2.71 23.05 |
Figure 1 A manganese carbonate ore flotation process
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