Bond Index Tester BT 100 XL

Description

A detailed overview and knowledge of the characteristics of a raw material is of utmost importance, especially when planning the layout of a crushing plant. In order to minimize all possible risks extensive trials are necessary to obtain information on the properties of the raw materials. A clear definition of the required crushing capacities and the desired product quality can be precisely determined by using the Bond Index test methods. This knowledge is essential to define the required ball mill layout and production capacity.

In order to perform the Bond Index Test successfully it is necessary to use pre-crushed sample material as defined below :

Module Ball Mill :
• Drillcore pre-crushed to < 3.35 mm and sieved
• Half Drillcore pre-crushed to < 3.35 mm and sieved
• Minerals pre-crushed to < 3.35 mm and sieved

The Bond Index conforming ball charge consists of :

• 43 x 1.45” balls
• 67 x 1.17” balls
• 10 x 1” balls
• 71 x 0.75” balls
• 94 x 0.61” balls

The optimum number of grinding balls is 285. However, the ball diameters vary due to wear. Therefore, the total ball number should be adjusted from time to time to ensure a total mass of 20.125 grams.
The grinding jar of the Bond Index Ball Mill measures 12″ x 12″ and has well-rounded corners.

Module Rod Mill :
• Drillcore pre-crushed to < 12.50 mm and sieved
• Half a drillcore pre-crushed to < 12.50 mm and sieved
• Minerals pre-crushed to < 12.50 mm and sieved

The Bond Index conforming rod charge consists of :

• 6 rods of 1.25“ diameter and 21“ length
• 2 rods of 1.75“ diameter and 21“ length

At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill. The Rod Mill Work Index (RWI) is used for particle size determination in a size range from 25 mm down to 2.1 mm whereas Ball Mill Work Index (BWI) is used for the range from 2.1 mm down to 100 µm.

Adjustment of grinding parameters :
The operation display permits convenient selection and storage of parameters such as rotation counter, rotation speed, grinding time, start and stop.

Product Advantages :
• Available modules include Ball Mill and Rod Mil
• Convenient parameter setting via display
• Emergency switch
• Easy tilt function to empty the drum
• Funnel with handles
• Grinding jar with gasket for loss-free operation
• Guide rail allows for ergonomic removal of jar
• Removable sample collector
• Separation grid to separate sample from grinding balls (only for Ball Mill)
• Suitable for the determination of Work Index according to Bond
• Solid steel frame
• Solid noise-protection hood with safety switch

Features :

Applications :	quantification of grindability of ores and minerals
Field of application :	construction materials, environment / recycling, geology / metallurgy
Feed material :	hard, brittle
Size reduction principle :	friction
Material feed size* :	< 3.35 mm with ball module / 12.50 mm with rod module
Final fineness* :	< 100 µm with ball module / 2,100 µm with rod module
Batch size / feed quantity* :	min. 15 kg with ball module / min. 20 kg with rod module
Rotation speed :	70 min^-1 with ball module / 46 min^-1 with rod module
No. of grinding stations :	1
Material of grinding tools :	hardened steel
Grinding jar sizes :	21.7 l with ball module / 43.3 l with rod module
Setting of grinding time :	digital
Drive power :	0.75 kW
Electrical supply data :	different voltages
Power connection :	1-phase
Protection code :	IP 50
W x H x D closed :	1500 x 1200 x 700 mm
Net weight :	~ 295 kg
Standards :	CE