Flotation machine--mechanical stirring flotation machine (2)

(4) Extensive use of compressed air Compressed air type models can maintain a large amount of inflation at a lower rotational speed. Its superior performance is as follows: the low speed of the wear parts (rotor and stator) has a long service life, which can be guaranteed to be replaced only once a year; when the aeration amount is large, the fluid density in the stirring zone is small, the driving power consumption is reduced; and the supply air pressure can be adjusted quickly. The amount of inflation is changed so that the thickness of the foam layer and the rapid adjustment of the amount of foam discharge can be achieved. This creates conditions for automated control.
The gas-pressure flotation machine can not self-slurry, and the slurry and foam products fed into the flotation tank are transported by the long-axis vertical pump. The slurry conveyance in the tank depends on the self-flow, and there should be a drop between the flotation tanks of different operations. The flotation machine Step by step configuration according to the job.
(5) Increasing the circulation amount of the slurry in the tank through the impeller is beneficial to increase the aeration amount, promote the suspension of the slurry, and promote the improvement of the flotation speed. Figure 4 shows several Frozen-type rotor-stator systems of the Fleetwald type. In the 1920s, there was no hole in the cover of the Fleenwald type flotation machine, the slurry circulation was weak, and the amount of inflation was small. China's design (XJ type) and the Soviet design (Michanoble type A, now called Ñ„ M type) have holes (16~24) in the cover plate, and an adjustable hole is added to the stator sleeve. (Figure 4). In Japan's improved (FF type), there are 12 rows and 16 holes in the two rows on the cover plate, and the four holes on the stator sleeve are also opened when not sucking. Denver made the cover plate toothed (Fig. 4c), allowing the slurry to enter the impeller. Practice has shown that these practices have achieved a significant increase in the amount of inflation. The test data of the FF-30 type shows that the aeration amount can reach 1 m ³ /m ² •min, while the old Fleenwald flotation machine only has 0.3 to 0.6 m ³ /m ² •min.
(6) Generally, shallow grooves are used, that is, the aspect ratio is less than 1. The larger the volume, the smaller the aspect ratio.
(III) Structure of the rotor-stator system Figure 5 depicts the mechanical structure of the rotor-stator system of the widely used and promising models of flotation machines. Among them, Denver DR, Akitel, OK, and Wimco 1+1 occupy the market in countries all over the world. The first three are compressed and the latter are self-aspirating. The above four flotation machines are not self-priming and require a stepped configuration. The largest quantity used in China is the xJ type, which is similar to the Mihano A type. It is also an improved version of the Falengerwald flotation machine. It has a good suction capacity and is suitable for changing the flotation process after it is put into production.
The rotor (impeller) can be divided into two categories: a blade-shaped centrifugal impeller and a rod impeller.

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A blade-shaped centrifugal impeller The specific design scheme is roughly divided into four types. (1) Single-sided impeller The blades are arranged radially, only on the upper surface of the disc. The flotation machines using this scheme are: Frentalwald type and its improved type (XJ type, Mihanopur (Type A, Denver SubA type, FF type, etc.), Denver DR type and its improved type (CHF- X type, BS-X type, XJC type), salaBEF type. Its structure is shown in Figure 2a, Figure 4, Figure 5. (2) Both sides of the double-sided impeller disc have blades on both sides, which has strong mixing ability. The flotation machine of the scheme is SF type, Humboldt type (the impeller disc is at an angle of 5°~15° with the horizontal plane, the heights of the upper and lower blades are not equal), etc. (3) The blades of the centrifugal pump impeller are curved and located. A closed channel is formed between the upper and lower discs. The slurry outside the tank enters the impeller from the suction port at the center of the lower disc. The sub-blade on the upper disc and the impeller cover form a vacuum chamber, which draws in air or opens a hole in the top of the impeller. cover, the air sucked inside the impeller (FIG. 6) using the flotation machine of this embodiment are:.. xJM type, Φm-2.5 type, Mi Niemai HC type, which are selected from the coal equipment (4) mixed flow pump impeller which The blade is located on the conical chassis, and the blade has a larger angle with the busbar of the conical surface. At the time of the impeller, there must be a fixed truncated cone (Fig. 7). When the impeller rotates, the inside of the impeller is a negative pressure zone, and the air is entrained by the slurry (inflated). When the slurry is along the cone When shooting toward the bottom of the groove, air is sucked from the back of the impeller through the gap between the outer edge of the impeller and the truncated cone (secondary aeration). That is, the front and back sides of the impeller can form a negative pressure zone. The test proves that self-priming In the gas working state, the sum of the air flow rates drawn by the front and back sides of the impeller is constant. When the slurry suction volume is increased, the front air intake amount will decrease, thus causing the slurry gas flow density to increase. The increase in the back side increases the amount of suction on the back. This type of impeller is dedicated to the HCC type (also known as the annular jet type, referred to as the ring type) flotation machine. If used in shallow grooves, the self-inhalation mode can make the amount of inflation. is 1 to 1.3 m ³ / m ² • min. If a deep groove, can be changed puffer type, low pressure air is introduced into the hollow shaft from the back of the impeller, as long as the amount does not exceed the inflator overflow value, the state can be maintained since the grout.

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