centrifugal gold separator for small scale mining plant
Introduction
STLB concentrator is kind centrifugal concentration equipment. It can be used not
only for placer gold mining, but also for hard rock mining to recover the natural gold,
replacing amalgamation. It is also used to recover gold from the old tailings.
Since 1985, three models have been developed. Application shows that the
recovery can be as high as 99%, especially for the case in recovering the natural gold
in lode ore with 65% of the ore having a milling size of —0. 074mm, the recovery for
the natural gold is expected up to 98%. For that natural gold of 0.004mm in particle
size, the recovery is 97%. The cleaning up cycle is 1~4 hours, and the upgrade ratio is
up to 1,000 times. The equipment is patented in China.
Process Description
The STLB Concentrator is specifically designed for recovery of free, metallic gold, platinum or
silver from hard rock circuits and is also an ideal technology for alluvial gold including secondary
recovery from sand and gravel operations. The STLB Concentrator subjects the material being
processed to a centrifugal field of up to 60G’s which allows recovery of finer native metals than
with conventional gravity concentration equipment. Periodically, the high grade concentrate is
removed from the concentrate cone during the rinse cycle. The rinse cycle time is typically less
than 20 minutes per cycle. Optimum operating cycles will range from <1hr to >4hrs.
Feed is screened at approximately 2-4 mm depending on the application, introduced as slurry
through the central vertical feed pipe, and accelerated by the rotor. Rapid stratification according
to specific gravity occurs as the material is driven up the grid concentrate cone wall under the
influence of an immense gravity field. Fluidization water is injected through the rotor wall to
create a dilated or fluidized bed. The high specific gravity gold or other target particles become
embedded in this zone and are retained here until the machine is stopped and the concentrate is
rinsed down through the concentrate discharge ports. A centrally located rinse manifold directs
jets of water to thoroughly rinse concentrate from the retention zone after each operating cycle.
Section of the STLB Concentrator
How does STLB Concentrator Work?
1. Fluidization water is introduced into the concentrate cone through a series of
fluidization holes.
2. Feed slurry is then introduced through the stationary feed tube and into the
concentrate cone. When the slurry reaches the bottom of the cone it is forced
outward and up the cone wall under the influence of centrifugal force.
3. The slurry fills each ring to capacity to create a concentrating bed.
Compaction of the concentrating bed is prevented by fluidization process.
4. The flow of water that is injected into the rings is controlled to achieve
optimum bed fluidization. High specific gravity particles are captured and
retained in the concentrating cone.
5. Upon conclusion of the concentrate cycle, concentrates are flushed from the
cone into the concentrate launder through port.
Operation
1) The preparation and pre-check before startup
1. Prepare and check before startup according to the operating requirement.
2. Check whether the degree of tightness of V belts is appropriate.
3. Check whether the moving part is no intervening to each other.
4. Check whether the Concentrate discharge pipe is closed.
2) Start the equipment
1. Follow the requirement of the preparation and pre-check before startup, then,
turn on the power supply. Make sure the running orientation of electromotor is
the same as red arrowhead on the outsider of launder, and every part does not
interfere each other. All after that, you can turn on the power supply and the
equipment is under the natural running.
2. Feed the slurry
Open the fluidization water valve when the equipment working normally,
meanwhile, feed the slurry which confected under the required proportion of
liquid and solid.
3. Attention when the equipment is working
a) Under the working requirement of electromotor, watch the temperature and
current.
b) Make sure that every moving parts are working normally.
c) Pay attention to the proportion of liquid and solid of slurry at any time, adjust
it in time.
4. Stop the equipment
Clear up the concentrate after the period of working time. Before stop the
equipment, stop feed slurry first, upon conclusion of the concentrate cycle;
concentrates are flushed from the cone into the concentrate launder through
port.
5. Abnormal stop
In special situation that need stop the equipment temporarily, make sure that
stop feed slurry fist and then stop supplying fluidization water, stop the
equipment at last. Stop the equipment for a long time is lose, because it is easy
to the Concentrate which is in the concentrate cone. In addition, it must feed
slurry at first then add the fluidization water when turns on the equipment again
after temporarily stop the equipment. It can avoid loosing gold.
Equipment Maintenance
1. Maintenance the equipment periodically as the requirement of electromotor.
2. Clear up the equipment after one period of working time.
The technical specifications of STLB20 Concentrator
Feed Capacity：0～600kg/hr. (Solids)
Fluidization Water Requirement：2～3 m3/ hr.
Slurry Water Requirement：1.5～4 m3/ hr
Feed Density：0～50 ％ Solids/ Weight
Feed Size：0～3 mm
Concentration Cleaning Up Cycle：Vein Gold 1～3 Hours. Placer Gold 2～6 Hours.
Concentrate Weight： 2 kg
Power Requirements：0.75 kW
Approximate Shipping Weight：205 kg
Approximate Crated Shipping Dimensions：Length 914mm x Width 700mm x Height 900mm
The technical specifications of STLB30Concentrator
Feed Capacity：2～3tons/hr. (Solids)
Fluidization Water Requirement：3～5 m3/ hr.
Slurry Water Requirement：5～7 m3/ hr
Feed Density：0～50 ％ Solids/ Weight
Feed Size：0～3 mm
Concentration Cleaning Up Cycle：Vein Gold 1～3 Hours. Placer Gold 2～6 Hours.
Concentrate Weight：3～5 kg
Power Requirements：1.5 kW
Approximate Shipping Weight：380 kg
Approximate Crated Shipping Dimensions：Length 1160mm x Width 885mm x Height 1165mm
The technical specifications of STLB60 Concentrator
Feed Capacity：8～12 tons/hr. (Solids)
Fluidization Water Requirement：7～10 m3/ hr.
Slurry Water Requirement：8～12 m3/ hr
Feed Density：0～50 ％ Solids/ Weight
Feed Size：0～5 mm
Concentration Cleaning Up Cycle：Vein Gold 1～3 Hours. Placer Gold 2～6 Hours.
Concentrate Weight：10～20 kg
Power Requirements：4 kW
Approximate Shipping Weight：1,110 kg
Approximate Crated Shipping Dimensions：Length 1820mm x Width 1450mm x Height1700mm
