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Bond's Third Theory

A comminution theory concerned with the energy required to reduce a given size of feed to a required size of product. On his theory F.C. Bond based an empirical formula which may be used to compare the efficiencies of crushing plants etc.


Bucket Elevator

A continuous line of buckets attached by pins to two endless chains running over tracks and driven by sprockets; alternatively, the buckets are attached to a rubber belt. Used for raising loose materials or slurries at high angles or vertically.

Also: elevator



abbr. bench march

A point of known elevation above Ordnance datum which has been established by the Ordnance Survey. 



abbr. British Standards Institution

National Standards body of the UK that facilitates the production of British, European and International standards.


Bucket Wheel Excavator

A continuous excavator of large capacity suitable for relatively weak materials or recovery of materials from stockpiles. Comprising of a large diameter, rotating wheel fitted with buckets which discharge’s material through the hub onto a conveyor belt.


Bucket Crusher

A bucket containing an hydraulically powered crushing device that can be attached to an hydraulic excavator.  The base of the bucket is a grid which allows the crushed material to be discharged.  Can be useful in construction and demolition activities.

Also: crusher bucket

Glossary image: 
Bucket crusher

Bitumen Tank

A tank or vessel for storing bitumen which must be heated to prevent the bitumen solidifying and provided with a number of safety devices.

Glossary image: 
Bitumen tanks

Belt Scraper

A belt cleaning device, usually a blade or brush of some kind, which is actually in contact with or positioned very closely to a moving conveyor belt, to remove adhering material.

Glossary image: 
Belt scrapers

Belt Press

A type of dewatering device for finely sized material such as silt and clays.  The device employs vacuum filtration to form a filter cake on one belt which is then compressed by rollers between two filtration belts to express more water, hence the name.

Glossary image: 
Belt press