clinker Grindability

Grinding …

is necessary

o to create surface area so that a good chemical reaction occurs (Blaine)

o to reduce particle size and ensure that all of it will be consumed (mesh sieves and micron sizes)

uses ~ 60% of plant electricity

To evaluate energy required to reach a wanted fineness

measured thanks to BB10 test

o giving the industrial kW depending on the fineness

o can be done for raw mix material and also for clinker

Raw mix material grindability

What not to do

o have a raw material under-dosed in lime

o have variable RM

What to do

have a constant RM

Clinker grindability

Clinker BB10 Grindability in the Group

What parameters influence  clinker grindability?

Main parameters

Other parameters

Influence of belite

Influence of SO3 in clinker

What not to do

o To have too much SO3 in clinker (find a good compromise between reactivity and grindability)

o To have a reducing flame

What to do

o To have good burning potential

o To have a good flame

Influence of additives

Slag

o difficult to grind like clinker or more

Ashes

o easy to grind

Pozzolanas

o variable but always abrasive

Fillers

o silica : as difficult to grind as clinker

o limestone : easy to grind but one must control fineness production