JPH046829Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(a) Technical field The present invention relates to a flotation machine with a simple structure and high efficiency for flotating ore. (b) Prior art In a flotation machine, a slurry in which ore particles are suspended in a liquid is placed in a flotation tank, and air bubbles are sent into the tank, so that certain types of ore particles selectively adhere to the air bubbles. This is a machine that separates and recovers minerals by utilizing the phenomenon in which minerals rise to the surface of slurry along with air bubbles. Flotation machines that are currently in practical use send gas to the center of the flotation tank, and the centrifugal force caused by rotational agitation causes the gas to be blown around and collide with baffles fixed around the inside of the tank as it rotates. It makes use of the air bubbles that are generated during this process. However, as mentioned above, most of the bubbles are scattered horizontally and rise after colliding with the baffle plate in the tank.
Since the slurry reaches the surface, the number of bubbles in the center of the tank is relatively small, and the center of the tank does not function as a flotation machine. In addition, in conventional flotation machines, it is essential to install a baffle plate in the tank in order to generate air bubbles as described above, but this also obstructs the movement of the slurry, making it easier for ore grains to settle. Moreover, if the gas moves slowly, it will simply come out of the baffle plate, making it impossible to generate small bubbles. For this reason, it is necessary to increase the rotational speed of the stirring blade, but this will lead to an increase in energy costs and maintenance costs. Historically, there have also been flotation machines in which a rotating body covered with cloth is placed in the slurry, air is blown into the rotating body, and air bubbles are released into the slurry through the cloth, but the cloth is not durable. Also, it is not used these days because it tends to clog easily. (C) Disclosure of the invention The present invention solves the problems of the conventional flotation machine as described above with a simple configuration, and the flotation machine of the present invention will be described in detail below. Figures 1 and 2 show an example of the present invention, in which 1 is a hollow rotating shaft equipped with a motor (not shown) above, and the outer periphery of the lower end of the shaft 1 has one or more small holes on the upper surface. A rotary body 2 having a circular planar shape and having a wall formed along the lower outer periphery of the rotary body 5 is integrally attached, and the rotary body 2 is attached slightly from the inner bottom surface of the flotation tank 4. It is designed to rotate in the horizontal direction together with the rotating shaft 1 below the center of the tank 4 with a gap between them. Reference numeral 3 denotes stirring blades fixedly attached radially to the lower surface of the rotating body 2 near the rotating shaft 1. Reference numeral 6 denotes a plurality of baffle plates fixedly protruding radially from the inner surface of the flotation tank 4 toward the rotating body 2, and each baffle plate 6 is protruded to a position close to the outer peripheral surface and top surface of the rotating body 2. It is arranged so as to surround the rotating body 2. When air is blown into the rotating shaft 1 and the rotating body 2 is rotated, the air becomes bubbles as it passes through the hole 5 on the top surface of the rotating body 2 and the gap between the lower end of the rotating body 2 and the bottom of the tank 4. The ore grains are released into the suspended slurry 7, and air bubbles float to the surface of the slurry 7 while adhering to the ore grains in the slurry. Note that the rotating body 2 is not limited to the shape shown in FIGS. 1 and 2, and as shown in FIG. Alternatively, it can be simply a disk body C. In addition, in the above description, a plurality of small holes 5 were formed in the rotating body 2, stirring blades 3 were provided, or a baffle plate 6 was placed in the tank 4, but these methods are effective in the case of a large flotation machine. This is not necessarily necessary for the forced air blowing type as mentioned above.
This is especially necessary in an air suction type flotation machine using rotation of the rotating body 2. (d) Example The flotation machine shown in Figures 1 and 2 was changed to four different configurations, Experiments 1 to 4, as shown in the table below, and the tank size was 155 mm.
The experiment was conducted using a conventional small experimental flotation machine with a cubic size of 155 mm x 155 mm. The ore used was from Mine A, 350 g/t of ethyl xanthate was used as a collecting agent, 25 g/t of Dow Floss #250 (trade name) was used as a foaming agent, and the slurry concentration was
I did it at 30%. These results are shown in the table.

【table】

[Table] As shown in the previous table, good results were obtained in all experiments 1 to 4. Experiments 1 and 2 were of an air-blowing type, in which air was sent into the hollow part of the rotating shaft using a blower, and in this type, the stirring blades 3 and baffle plate 6 were removed. Therefore, it can be said that the mechanism is simpler than any flotation machine currently in practical use. In particular, the type used in Experiment 2 has a simpler mechanism as there is no hole 5 in the rotating body 2. However, the actual yield rate is slightly better in Experiment 1, and the difference is expected to widen further if the size is increased. . Experiments 3 and 4 were of the air suction type, and this type required stirring blades 3 to suck in air, and a large amount of slurry moved with the air, causing the slurry to rotate at high speed. baffle plate 6 is required. However, since this baffle plate 6 is not for generating bubbles, the mechanism is simple. In addition, in this type, it is necessary to rotate the rotating body 2 at high speed to generate bubbles, so it is possible to reduce energy costs and maintenance costs compared to conventional self-priming flotation machines. Furthermore, according to Experiments 3 and 4, although the actual yield was lower than that of the air-blown type, high-quality concentrate could be obtained. In addition, in the model of Experiment 4, the rotating body 2 has a slightly elongated cylindrical shape as shown in FIG. (e) Effects of the invention The advantages of the flotation machine of the invention are as follows. (a) The structure is extremely simple, especially when it is of the type that forcibly blows gas, and it can exhibit the same effectiveness as a normal flotation machine even without stirring blades, baffles, or small holes in the rotating body. , manufacturing costs, energy costs, and maintenance costs will decrease. In addition, when using the gas suction type, stirring blades, etc. are required, but the baffle plate in particular is used not to generate bubbles but to prevent the slurry from rotating too quickly, so the structure is extremely simple. . (b) Due to the presence of holes in the rotating body, air bubbles are homogeneously dispersed within the tank, resulting in good flotation efficiency and the ability to increase the size without reducing efficiency. (c) If the projected area of the rotating body on the tank bottom is increased,
Since the mechanical stirring power is applied over a wide area within the tank, it can be expected to effectively prevent the deposition of ore grains. (d) Even if ore grains enter the underside of the rotating body through the holes of the rotating body, they are naturally discharged to the outside of the rotating body, so the holes can be enlarged and clogging can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a sectional front view showing an example of a flotation machine according to the present invention, Fig. 2 is a sectional view taken along line A-A in Fig.
Figures A to D are cross-sectional views showing various other shapes of the rotating body used in the flotation machine of the present invention. Symbol explanation, 1...Hollow rotating shaft, 2...Rotating body,
3... Stirring blade, 4... Flotation tank, 5... Hole, 6...
...Baffle board, 7...Slurry.

Claims (1)

[Scope of utility model registration request] An air suction type flotation system comprising a hollow rotating shaft whose interior serves as an air supply path, and a rotating body that is attached to the outer periphery of the lower part of the rotating shaft and rotates together with the rotating shaft with a slight gap from the inner bottom surface of the flotation tank. A flotation machine, characterized in that the rotating body is a whole lid-shaped body, and a plurality of small holes are bored in the upper surface of the rotating body.