31.01.2013 Views

BATEMAN GREASE RECOVERY SYSTEMS

BATEMAN GREASE RECOVERY SYSTEMS

BATEMAN GREASE RECOVERY SYSTEMS

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

<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

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!