Commonly used mixing and leaching tanks and their construction and working principle
According to the different functions and modes of mixing, the commonly used stirring leaching tanks in the industry can be divided into:
1. Mechanical agitated leaching tank The mechanical agitating leaching tank shown in the following figure is one of the more common applications in gold cyanide plants.
In the center of the leaching tank there is a slurry receiving tank 1 having a branch pipe 2 thereon. There is a vertical shaft 3 in the slurry receiving pipe 1, and a cover plate 6 at the lower end of the vertical shaft 3 to prevent the ore from being deposited on the propeller 4 when the vertical shaft is stopped. The slurry enters the leaching tank from the launder 7 or the feed pipe 8 and is discharged by the discharge pipe 9.
When the propeller rotates rapidly, the slurry flows from each branch pipe 2 into the pipe 1, thereby forming a vortex, into which air is drawn. At the same time, the slurry is discharged to the tank wall, and is lifted in the vicinity thereof to enter the pipe 1 by the branch pipe.
In production, sometimes several compressed air tubes are inserted vertically into the tank, and an air lifter is installed to increase the ability to inflate and stir.
2. Air agitated leaching tank This tank uses the pneumatic action of compressed air to agitate the slurry. A Pachuca or Corossa-type air lifter is installed in the tank. The figure below is the air agitation leaching tank. The tank is a circular groove with a 60 degree conical bottom and a diameter of 3.7 meters and a height of 13.7 meters. A central vertical tube 1 having openings at both ends is provided in the tank. The slurry enters the tank from the slurry inlet 2, and enters the tube 1 through the tube 3 from below the tank, and bubbles rise. At this time, the pressure of the slurry column in the tank is greater than the pressure of the slurry column in the pipe 1, so the slurry is always in a moving state, and rises along the pipe 1 and overflows at the upper end thereof. The slurry is continuously circulated inside and outside the pipe 1 and remains in suspension.
After the leaching is completed, the slurry which is leached by the intermittent stirring cyanidation method is discharged from the lower portion, and the continuous stirring cyanidation method is discharged from the upper portion.
3. Air and mechanical combined stirring leaching tank. The tank is in the center of the tank. It is installed in the air lifter and mechanical boring, or has an air lifter in the periphery. A circular groove with a circulating pipe and a propeller is placed in the middle of the tank. Fig.) The trough is a flat bottom, and the air riser 1 is installed in the center of the trough. The lower end of the tube 1 is provided with a dice 2, and the upper part is provided with a perforated trough 3. The upper end of the tube 1 is connected to a vertical shaft 4 suspended on the cross frame 5. The slurry entering the tank submerges to the bottom of the trough, and the concentrated slurry that has settled at the bottom of the trough rises to the air riser 1 by the rotation of the dice 2 and overflows into the overflow trough 3 after overflowing at the upper portion thereof. Then, the opening in the trough 3 flows back into the trough. Because the trough 3 rotates with the vertical axis, the slurry is evenly distributed therein. The slurry is continuously entered by the feed port located at the upper part of the trough, and passes through the position just as the feed port. The corresponding discharge openings are continuously discharged.
Compared with the air agitation leaching tank, the stirring leaching tank has the following advantages: the tank height is not large (about 6 meters), there is no deposit at the bottom of the tank, the dissolution rate of gold is fast, and the consumption of cyanide is small.
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