The document describes a leaching agitation tank used in gold cyanidation processes. It has two rotating impellers that agitate and disperse air through the ore pulp to improve absorption rates. The tank uses a dual impeller system to move the pulp downward and diffuse it along damping plates while air is fed in to form a uniform suspended mixture for leaching. Technical parameters are provided for different tank models ranging from 2 to 8.5 meters in diameter and height, with information on volume, impeller speed, motor power and weight.

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◆Advantages
•Entering leaching tank via hollow shaft, air is agitated and dispersed by rotation of impellers.
•The two new type impellers with large diameter, low speed and low power consumption, which can reduce the wear of carbon
•The moderate stirring intensity, pulp concentration and fineness distributes consistently can improve the adsorption rate and import
rate.
◆Work Principle
With dual impellers rotating and agitating, ore pulps move downward and then diffuse along damping plate. Air is fed in tank from
the lower end of shaft, and blended with ore pulps to form uniform suspending mixed liquid.
In the gold cyaniding process, leaching agitation tank is applied to leach and carbon-absorb ore pulps whose fineness is -200
meshes and whose density is less than 45%. Under similar circumstance, it is also applied to agitation and leaching in metallurgy,
chemical and light industry.
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Leaching agitaion ta
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Leaching Agitation Tank, which is widely use in Cyanidation processes may include the following operations:
1. Agitated tank leaching
2. Heap leaching
3. Carbon adsorption recovery
4. Zinc precipitation recovery
CYANIDATION
Cyanide leaching is the standard method used for recovering most of the gold
throughout the world today. The process originated around 1890 and quickly
replaced all competing technologies. The reason was strictly economical in
nature. Where amalgamation plants could recover about 60% of the gold present,
cyanide could recover about 90%. Because of the improved recovery, many of
the old tailings piles from other processes have been economically reprocessed
by cyanide leaching. Cyanide is as close to a “universal solvent” for gold
as has been developed. Other leaching reagents will only work on very specific
types of ore.
The standard cyanide leach process consists of grinding the ore to about
80% – 200 mesh, mixing the ore/water grinding slurry with about 2 pounds
per ton of sodium cyanide and enough quick lime to keep the pH of the solution
at about 11.0. At a slurry concentration of 50% solids, the slurry passes
through a series of agitated mixing tanks with a residence time of 24 hours.
The gold bearing liquid is then separated from the leached solids in thickener
tanks or vacuum filters, and the tailings are washed to remove gold and cyanide
prior to disposal. The separation and washing take place in a series of units
by a process referred to as counter current decantation (CCD). Gold is then
recovered from the pregnant solution by zinc precipitation and the solution
is recycled for reuse in leaching and grinding.
◆Technical Parameters
Model Tank
Specification
（D × H）
(mm)
Effective
Volume
(m3)
Impeller
Rotation
Speed
(r.p.m)
Impeller
Diameter
(mm)
Motor
Power
(kw)
Model of
Planetary
Cycloid
Reducer
Tank
Weight
(kg)
Total
Weight
(kg)

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SJ2.0×2.5 2000×2500 6 52 909 2.2 XLD2.2-4-
29
1609 2144
SJ2.5×2.5 2500×2500 9.82 43 935 4 XLD4-5-35 2159 2729
SJ2.5×3.15 2500×3150 13.14 52 935 2.2 XLD2.2-4-
29
2398 3095
SJ3.0×3.0 3000×3000 18 40.85 1130 4 XLD4-5-35 3480 4583
SJ3×3.15 3000×3150 18.93 43 1130 4 XLD4-5-35 3480 4160.6
SJ3×3.5 3000×3500 21 43 1130 4 XLD4-5-35 3211 4334.6
SJ3.15×3.55 3150×3550 24 43 1260 4 XLD4-5-35 3433.5 4322.8
SJ3.5×3.5 3500×3500 30 52 1310 5.5 XLD5.5-5-
29
3480 5025
SJ3.5×4 3500×4000 32.7 52 1310 5.5 XLD5.5-5-
29
4230 5429
SJ3.55×4.0 3550×4000 33.6 43 1310 4 XLD4-5-35 4260 5025
SJ3.7×4.2 3700×4200 38.4 42 1310 4 XLD4-5-43 5266 6153
SJ4.0×4.5 4000×4500 48 35 1750 7.5 XLD7.5-7-
43
6397 7569
SJ4.0×6 4000×6000 70 33 1750 11 GRF137-
Y11-4P-
44.65-M4
7681 9200
SJ4.5×5.0 4500×5000 71.57 35 1750 7.5 XLD7.5-7-
43
8614 10864
SJ5.0×5.6 5000×5600 98 31 2046 11 XLD11-8-47 8740 14291
SJ5.5×6.0 5500×6000 112 31 2100 11 XLD11-8-47 14267 18745
SJ6.5×7.0 6500×7000 195 21 2400 22 GRF147-
Y22-4P-
70.87
17890 25978

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SJ7.0×7.5 7000×7500 245.4 21 2400 22 XLD22-10-
47
20505 29030
SJ7.5×8.0 7500×8000 268.6 23 2900 22 BLD7-43-
22L
22552 32796
SJ8.0×8.5 8000×8500 319 18.5 3300 30 TPS315-3F 30559.5 42467.3
SJ8.5×9.0 8500×9000 395 18.5 3300 30 TPS315-3F 34130 46623
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