BATEMAN GREASE RECOVERY SYSTEMS
BATEMAN GREASE RECOVERY SYSTEMS
BATEMAN GREASE RECOVERY SYSTEMS
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<strong>BATEMAN</strong> <strong>GREASE</strong><br />
<strong>RECOVERY</strong><br />
<strong>SYSTEMS</strong><br />
NEELS VAN NIEKERK<br />
<strong>BATEMAN</strong> MODULAR PLANTS
INTRODUCTION<br />
• Historically the only reliable means of recovering<br />
diamonds before the use of X-ray separators<br />
• Disregarded in the design of final recovery systems<br />
for security reasons<br />
• Development of automated, “hands-off” grease belt<br />
led to a boom in the market
PRINCIPLE<br />
• Adhere to grease due to hydrophobic and<br />
oleophyllic properties<br />
Process<br />
• Wetted diamond-bearing gravel washed<br />
over grease coated surface<br />
• Diamonds will stick to grease<br />
• Majority of gravel washed over surface
PRINCIPLE
ADVANTAGES OF <strong>GREASE</strong> BELTS<br />
OVER X-RAY X RAY SEPARATORS<br />
• Ability to recover low-luminescent (Type II diamonds)<br />
• Higher recovery efficiency on small diamond sizes<br />
(- 4mm)<br />
• Higher unit feed rates treating finer size fractions<br />
• Lower capital and maintenance cost<br />
(per ton plant capacity)<br />
• Lower E&I complexity
<strong>BATEMAN</strong>’S <strong>BATEMAN</strong> S RANGE OF<br />
<strong>GREASE</strong> BELTS<br />
Bateman have developed two basic grease belt designs:<br />
Bateman Conventional Grease Belt 1000<br />
and<br />
Bateman Compact Grease Belt 800<br />
Different designs for GB800 to treat:<br />
– 32 + 1 mm (350mm φ pulley)<br />
– 50 + 32 mm (500mm φ pulley)<br />
Thicker belt required<br />
Bigger separation tank required
Bateman Conventional<br />
Grease Belt 1000<br />
Feeder 1 Feeder 2<br />
Double feeder unit (Feeder width = 750mm)
Bateman Conventional<br />
Grease Belt 1000<br />
ϕ<br />
Belt sloped to side
Bateman Conventional<br />
Grease Belt 1000<br />
Feed<br />
Water<br />
Belt direction<br />
Feed and water flow perpendicular to belt direction
Bateman Conventional<br />
Grease Belt 1000<br />
Size fraction 1 Size fraction 2<br />
Flexibility to treat two size fractions on the same belt<br />
(One size fraction per feeder)
Bateman Conventional<br />
Grease Belt 1000<br />
20 sold in the last 3 years
Bateman Conventional<br />
Size range<br />
-6 mm<br />
- 12 + 6 mm<br />
- 32 + 12 mm<br />
- 50 + 32 mm<br />
Grease Belt 1000<br />
2 tph per feeder<br />
3 tph per feeder<br />
5 tph per feeder<br />
5 tph per feeder<br />
Feed rate<br />
4 tph total<br />
6 tph total<br />
10 tph total<br />
10 tph total
Bateman Compact<br />
Grease Belt 800 (350mm φ pulley)
Bateman Compact<br />
Grease Belt 800 (500mm φ pulley)
Bateman Compact<br />
Grease Belt 800<br />
Single feeder unit (Feeder width = 600mm)
ϕ<br />
Bateman Compact<br />
Grease Belt 800<br />
Belt inclined
Belt<br />
Bateman Compact<br />
Grease Belt 800<br />
Gravel & water<br />
Feed and water flow 180 0 to belt direction
Bateman Compact<br />
Grease Belt 800<br />
Fully enclosed
Bateman Compact<br />
Grease Belt 800<br />
350mm φ pulley unit fits inside hi-cube shipping container
Bateman Compact<br />
Grease Belt 800<br />
Capable of treating two size fractions simultaneously<br />
(Split feeder and water trough)
Bateman Compact<br />
Grease Belt 800<br />
Feeder / Belt width could be changed to suit client needs
Bateman Compact<br />
Grease Belt 800<br />
8 sold in the last 2 years
Bateman Compact<br />
Grease Belt 800<br />
Size range<br />
-6 mm<br />
- 12 + 6 mm<br />
- 32 + 12 mm<br />
- 50 + 32 mm<br />
Feed rate<br />
1.5 tph<br />
2 tph<br />
3 tph<br />
5 tph
FACTORS THAT COULD INFLUENCE<br />
DIAMOND <strong>RECOVERY</strong> EFFICIENCY<br />
• Amenability of the diamond surface to grease recovery<br />
• Grease<br />
• Composition<br />
• Depth of grease layer<br />
• Water<br />
• Temperature<br />
• Flow rate<br />
• Quality
FACTORS THAT COULD INFLUENCE<br />
DIAMOND <strong>RECOVERY</strong> EFFICIENCY<br />
• Grease belt<br />
• Angle<br />
• Belt speed<br />
• Material<br />
• Feed rate<br />
• Size distribution<br />
• Grease belt design<br />
• Drop height<br />
• Belt vibration<br />
• Security considerations
Concentrate security & degreasing<br />
Grease belts are secured using:<br />
• Solid plate with glass windows<br />
• Security screen using mesh
Concentrate security & degreasing<br />
Process<br />
• Grease (and concentrate<br />
adhering to grease) are scraped<br />
off the belt and melted in separation tank with hot water
Concentrate security & degreasing<br />
Process<br />
• Concentrates sink to bottom of<br />
separation tank and tapped<br />
using actuated valves
Concentrate security & degreasing<br />
Process<br />
• Non-frothing detergent used<br />
for degreasing inside an<br />
enclosed strainer
Option of containerisation<br />
very popular due to:<br />
Containerisation<br />
• Trial erection and factory<br />
testing<br />
• Ease of installation and<br />
relocation
Containerisation
Other Developments<br />
• Water cooled applicator – patented<br />
• Water cooled bull dog pump drum<br />
• Improved detergent washing system<br />
• Own design on heat exchangers<br />
• Belt Excitor - additional motor to change the<br />
direction of vibration (opposite to material and water<br />
flow)<br />
• Water system to minimise water consumption, keep<br />
water temperature and grease mix constant and<br />
remove grid
Conclusion<br />
Bateman’s range of grease-belts have proven very<br />
successful in diamond recovery plants – Primary and<br />
Secondary applications<br />
Operating parameters are either controlled or monitored,<br />
minimising operator error<br />
Several advantages over x-ray separators
Conclusion<br />
Grease recovery technology should form<br />
part of all diamond recovery plants<br />
to maximise diamond recovery
Questions