According to the mixing principle and stirring mode of the stirring crucible, the stirring and leaching tank can be divided into three types of leaching tanks: a mechanical stirring leaching tank, an air stirring leaching tank and an air and mechanical combined stirring leaching tank.
a mechanical stirring leaching tank
In the mechanical stirring leaching tank, the mechanical stirring paddle rotating at a high speed completes the agitation of the slurry. The propeller type stirring leaching tank is a mechanical stirring leaching tank which is commonly used in production. When the propeller rotates rapidly, the slurry in the tank flows through the central slurry receiving pipe of each branch, thereby forming a vortex, and the air is sucked into the vortex, so that the oxygen content in the slurry reaches a saturation value. At the same time, the rotation of the propeller pushes the slurry in the receiving tube to the bottom of the tank, and then rises back from the bottom of the tank along the wall of the tank, and enters the central slurry receiving pipe through the circulation pipe to realize multiple cycles of the slurry.
The mechanical stirring leaching tank is characterized in that the slurry can be uniformly and strongly stirred and the air is continuously sucked into the slurry, so that the oxygen content in the slurry is high, and it is convenient to start after the shutdown, and the slurry does not press the propeller. In production practice, a number of vertical compressed air tubes are inserted into the tank or an air lifter is installed in the inner (outer) wall of the tank to increase the oxygen content and the stirring strength in the slurry.
b axial pump agitated leaching tank
The axial flow pump type stirring leaching tank is made by the rapid rotation of the impeller to suck the slurry at the bottom of the tank into the center tube and ascend it to the conical reflector. Since the lower surface of the reflector in the rotating state is tapered, the slurry is thrown toward the tapered surface of the reflector, and is changed in a direction of 90 degrees, and is removed in a fan shape toward the liquid surface of the slurry in the tank. At this time, the surface area of ​​the slurry in contact with the air is large, and the slurry is filled with air. In order to prevent the pulp from being centered on the slurry surface due to the large amount of solids, the inner surface of the suction pipe is provided with a folding plate. Due to the continuous rotation of the stirring paddle, the slurry is continuously discharged from the central pipe to achieve the circulation of the slurry, so that the slurry is evenly distributed throughout the leaching tank and is often saturated with oxygen, thereby realizing the leaching of gold .
C air agitation leaching tank (tower)
The air agitation leaching tank relies on the aerodynamic action of the compressed air to achieve uniform and strong agitation of the slurry in the tank. The upper part of the leaching tank is a tall cylinder and the bottom is printed. The cone is mainly composed of a body, a middle tube, a compressed air tube, a feeding tube and a discharge tube. During operation, the slurry enters the tank through the feed pipe, and the compressed air pipe passes through the lower part of the center pipe, and the compressed air rises in a bubble state in the center pipe, so that the density of the slurry in the center pipe is smaller than the pulp density in the annular space outside the center pipe. As a result, the slurry in the central pipe is continuously rising, and the slurry in the annular space outside the central pipe is continuously decreased, and the slurry circulation movement is realized, and the compressed air pressure and the flow-adjustable slurry stirring strength are adjusted. The slurry of the compressed air agitation leaching tank is stirred very strongly, so that the oxygen content in the slurry is close to the saturation value.
The air agitation leaching tank can be operated intermittently or continuously. The former is for the slurry to be discharged through the lower discharge pipe at the end of the leaching, and the latter is for the slurry to be discharged through the upper discharge pipe to enter the next leaching mash.
d mixing and stirring leaching tank
The center of the air and mechanical mixing and leaching tank is equipped with an air lifter and a mechanical rafter or a rounded tip with an air lifter around the tank, a slurry circulating pipe and a spiral stirring paddle in the center of the tank. The mixer is leached out of the tank. The characteristics of such a stirring leaching tank are that the tank body is short, there is no sediment at the bottom of the tank, the leaching speed of gold is high, and the consumption of the blister is low. The working principle is that the slurry enters the tank through the feed port at the upper part of the tank, and stratifies to the bottom of the tank in the tank, and the slurry settled at the bottom of the tank acts on the hollow riser by means of the rotation of the raft (I -4r/min). The mouth gathers, under the action of compressed air, the concentrated slurry rises along the air riser and flows in the two flow tanks with holes in the upper part of the stream, flows back into the tank through the flowing holes, and the fluid core rotates together with the vertical shaft, the pulp Evenly distributed in the tip. The leached pulp is continuously discharged from the discharge port opposite to the feed port, thereby achieving continuous operation.
e High-efficiency energy-saving mixing leaching tank
The high-efficiency energy-saving mixing tank is a new type of equipment developed in recent years. It has a double impeller structure. The air is dispersed into the slurry through the air duct, air switching valve and hollow shaft, so that the slurry is suspended and maintains a high dissolved oxygen content, thus ensuring the atmosphere. The need for leaching process conditions. The leaching tank has the advantages of low energy consumption, high efficiency, uniform stirring, reliable operation and the like. It is especially suitable for agitation leaching in a full-slurry plant. At present, it has become the main leaching equipment for domestic carbon pulp plants.
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