Flotation machine selection and calculation

(A) flotation machine flotation machine type selection, selection and specification of the nature of the ore (ore density, particle size, clay content, floatability, etc.), mineral processing plant scale, the number of series, processes, structure and other factors. When choosing, you should pay attention to the following issues.
(1) Ore properties and selection operation requirements: For the coarse or dense material feedstock, the flotation machine's suspension capacity should be given priority, that is, the slurry circulation performance in the tank. Sometimes the following abnormal conditions are encountered: the mud content is high, and the sludge enters the foam, causing the concentration of the product in the tank to rise by slot, resulting in insufficient driving power and difficulty in restarting after shutdown. At this time, the flotation machine with a shallow groove and a strong stirring ability should be preferred, such as a Waman flotation machine, an annular flotation machine, and the like. This is also the case when the product density is large in the tank and the grain size is coarse. In general, various types of mechanical stirring mineral flotation machine can adapt the size requirements of non-ferrous metal flotation. Generally speaking, the aeration volume of the flotation machine is adjustable, and can adapt to the different needs of rough selection and selection operations. The designer is mainly concerned with the maximum air volume and the stability of the foam layer.
(2) Reasonable determination of flotation machine specifications according to slurry flow rate: Large-scale flotation machine has the advantages of saving power and floor space, reducing the number of measuring instruments and actuators for automatic control, etc., and should be used preferentially. However, the number of flotation machines for each operation should be reasonably determined. Usually, no less than two slots are selected, and the thickness is not less than 4 to 6 slots. From this, the necessary single tank volume is calculated to determine the flotation machine specifications.
(3) The life of worn parts and the stirring ability and the amount of aeration after wear.
Despite the superior performance of flotation columns, especially microbubble flotation columns, mechanically agitated flotation machines still dominate. Finnish developed Autokomp OK flotation machines and Wimco 1 developed in the United States. +1, Denver D--R, Akitel and other three flotation machines dominate, and have been popular in countries around the world. In China, JJF type and XJQ type, CHF type, Bs--X type and XJC type, KYE type and BS--K type three types of flotation machines have been serialized and enlarged. They will replace the XJ type (or A type, XJK) type flotation machine produced in China. In order to transform the XJ flotation machine in the existing production, the Beijing Mining and Metallurgy Research Institute successfully developed the XJ _Z type flotation machine. The machine makes full use of the XJ-type flotation machine's tank body, scraper and scraper transmission parts, motor and motor frame parts, feed box, tailings box and foam tank, etc., and replaces the spindle parts to become non-absorbent and self-contained. Inhaled new flotation machine. Its impeller life is 3 to 4 times longer than that of the XJ type, and the amount of inflation is increased, and the foam layer is stable.
(2) Calculation of flotation machine A Determination of flotation time Generally, the residence time of the slurry in the flotation machine is determined according to the results of the flotation test and with reference to a similar ore concentrator example. Since the test was carried out in a single-flot flotation machine with intermittent ore feeding, and the production was carried out in a series of flotation cells continuously fed, the difference between the two was that the residence time distribution of the ore particles was quite different. In the production, the flotation time should be extended to reach the test index. Foreign design calculations have doubled the flotation time and the Chinese design has been extended by 50%. In addition, if the amount of aeration of the flotation machine installed in the newly designed concentrator is different from that of the test flotation machine, the flotation time should also be adjusted. The design flotation time is:

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Where t——— design flotation time, min;
t _o ———Flotation time of the single-slot flotation machine in the laboratory, min;
q _o ——— the amount of aeration of the single-slot flotation machine in the laboratory, m ³ /(m ² •min);
q———Inflatable volume of industrial flotation machine, m ³ (m ² •min);
Δ t—the increased flotation time based on experience, Δ t=kt _o ,min;
k———Adjustment coefficient, generally take k=0.5～1.
B Calculation of Volume Flow of Flotation Slurry The volumetric flow rate of the slurry fed to the flotation machine depends on the treatment capacity of the dry ore and the concentration of the slurry. For the convenience of calculation, the liquid-solid ratio is used to indicate the concentration, and there are:

Where W———calculated slurry volume flow, m ³ /min;
Q———calculated dry ore processing volume (including return amount), t/h;
R———the ratio of the slurry to the working fluid, ie the ratio of the weight of the liquid in the slurry to the weight of the solid; p—the density of the ore, t/m ³ ;
K ₁ ———The processing imbalance factor. When the ball mill is before the flotation, K ₁ = 1.0; when it is a wet self-grinding machine before the flotation, K ₁ = 1.3.
C Calculation and determination of the number of flotation slots The number of slots in the flotation machine is determined by the volume flow of the slurry:

Where n—the flotation machine calculates the number of slots;
W———calculated slurry volume flow, m ³ /min
t———Design flotation time, min
V———the geometric volume of the selected flotation machine, m ³
K ₂ ———The ratio of the effective volume to the geometric volume of the flotation machine. When sorting non-ferrous metal ores, take K2 = 0.8 ~ 0.85; when iron ore sorting, taking K ₂ = 0.65 ~ 0.75 takes a small value when the foam layer is thick, whichever is greater and vice versa.

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